Patent Publication Number: US-2022221097-A1

Title: Modular configurable wellsite surface equipment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Divisional of U.S. patent application Ser. No. 16/073,527 filed Jul. 27, 2018, which is a U.S. National Stage patent application of International Patent Application No. PCT/US2017/015205 filed Jan. 27, 2017, which claims priority to and the benefit of U.S. Provisional Patent Application No. 62/287,809 filed Jan. 27, 2016, entitled “Modular Configurable Wellsite Surface Equipment,” the entire disclosure of which is hereby incorporated herein by reference. 
    
    
     BACKGROUND OF THE DISCLOSURE 
     High-volume, high-pressure pumps are utilized at wellsites for a variety of pumping operations. Such operations may include drilling, cementing, acidizing, water jet cutting, hydraulic fracturing, and other wellsite operations. The success of the pumping operations may be related to many factors, including physical size, weight, failure rates, and safety. Due to high pressures and abrasive properties of certain fluids (i.e., dirty fluids), sealing components or other portions of the pumps exposed to such dirty fluids may become worn or eroded, which may result in severe damage and/or failures during pumping operations. Interruptions in pumping operations may reduce the success and/or efficiency of the pumping operations, effects of which may reduce hydrocarbon production of a well. In some instances, the pumping operations may have to be repeated at substantial monetary costs and loss of production time. 
     In some pumping operations, several pumps may be fluidly connected to a well via corresponding fluid conduits and at least one manifold. During such operations, the manifold distributes low-pressure dirty fluid from a mixer, blender, and/or other sources among the pumps and combines pressurized dirty fluid from the pumps for injection into the well. The manifold may have a large physical size and weight to satisfy intended fluid flow rates and operating pressures generated by the pumps. For example, the manifold may convey the dirty fluid at a pressure exceeding about 15,000 pounds per square inch (PSI) and a fluid flow rate exceeding about 1,500 gallons per minute (GPM). Such manifold may create a large footprint at the wellsite and may be difficult to customize for a particular job and/or transport to the wellsite. 
     SUMMARY OF THE DISCLOSURE 
     This summary is provided to introduce a selection of concepts that are further described below in the detailed description. This summary is not intended to identify indispensable features of the claimed subject matter, nor is it intended for use as an aid in limiting the scope of the claimed subject matter. 
     The present disclosure introduces an apparatus that includes a manifold assembly, the manifold assembly including multiple pressure exchangers, a first clean fluid conduit, a second clean fluid conduit, a first dirty fluid conduit, and a second dirty fluid conduit. The pressure exchangers each include a clean fluid inlet, a clean fluid outlet, a dirty fluid inlet, and a dirty fluid outlet. The first clean fluid conduit includes an inlet and multiple outlets. The second clean fluid conduit includes multiple inlets each in detachable fluid connection with the clean fluid outlet of a corresponding one of the pressure exchangers, and also includes an outlet. The first dirty fluid conduit includes an inlet and multiple outlets each in detachable fluid connection with the dirty fluid inlet of a corresponding one of the pressure exchangers. The second dirty fluid conduit includes multiple inlets each in detachable fluid connection with the dirty fluid outlet of a corresponding one of the pressure exchangers, and also includes an outlet. 
     The present disclosure also introduces an apparatus including a fluid manifold segment operable for detachably coupling with another instance of the fluid manifold segment to form a fluid manifold assembly. The fluid manifold segment includes multiple pressure exchangers each including a clean fluid inlet, a clean fluid outlet, a dirty fluid inlet, and a dirty fluid outlet. The fluid manifold segment also includes a first fluid conduit including opposing end ports and intermediate ports. The fluid manifold segment also includes a second fluid conduit including opposing end ports and intermediate ports each fluidly connected with the clean fluid outlet of a corresponding pressure exchanger. The fluid manifold segment also includes a third fluid conduit including opposing end ports and intermediate ports each fluidly connected with the dirty fluid inlet of a corresponding pressure exchanger. The fluid manifold segment also includes a fourth fluid conduit including opposing end ports and intermediate ports each fluidly connected with the dirty fluid outlet of a corresponding pressure exchanger. 
     The present disclosure also introduces a method including coupling multiple fluid manifold segments together to form a fluid manifold assembly. Each fluid manifold segment includes multiple pressure exchangers each including a clean fluid inlet, a clean fluid outlet, a dirty fluid inlet, and a dirty fluid outlet. Each fluid manifold segment also includes a first fluid conduit including opposing end ports and intermediate ports. Each fluid manifold segment also includes a second fluid conduit including opposing end ports and intermediate ports each fluidly connected with the clean fluid outlet of a corresponding pressure exchanger. Each fluid manifold segment also includes a third fluid conduit including opposing end ports and intermediate ports each fluidly connected with the dirty fluid inlet of a corresponding pressure exchanger. Each fluid manifold segment also includes a fourth fluid conduit including opposing end ports and intermediate ports each fluidly connected with the dirty fluid outlet of a corresponding pressure exchanger. The method also includes fluidly connecting the fluid manifold assembly with clean fluid pumps, fluidly connecting the fluid manifold assembly with a source of a dirty fluid, and fluidly connecting the fluid manifold assembly with a wellbore located at an oil and/or gas wellsite. 
     These and additional aspects of the present disclosure are set forth in the description that follows, and/or may be learned by a person having ordinary skill in the art by reading the material herein and/or practicing the principles described herein. At least some aspects of the present disclosure may be achieved via means recited in the attached claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure is understood from the following detailed description when read with the accompanying figures. It is emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG. 1  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 2  is a schematic view of the apparatus shown in  FIG. 1  in an operational stage according to one or more aspects of the present disclosure. 
         FIG. 3  is a schematic view of the apparatus shown in  FIG. 2  in another operational stage according to one or more aspects of the present disclosure. 
         FIG. 4  is a schematic view of the apparatus shown in  FIGS. 2 and 3  in another operational stage according to one or more aspects of the present disclosure. 
         FIG. 5  is a partially exploded view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 6  is a sectional view of an example implementation of the apparatus shown in  FIG. 5  according to one or more aspects of the present disclosure. 
         FIG. 7  is another view of the apparatus shown in  FIG. 6  in a different stage of operation. 
         FIG. 8  is an enlarged view of the apparatus shown in  FIG. 7  according to one or more aspects of the present disclosure. 
         FIG. 9  is an enlarged view of the apparatus shown in  FIG. 6  according to one or more aspects of the present disclosure. 
         FIG. 10  is a sectional view of another example implementation of the apparatus shown in  FIG. 5  according to one or more aspects of the present disclosure. 
         FIG. 11  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 12  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 13  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 14  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 15  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 16  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 17  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 18  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 19  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 20  is a perspective view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 21  is a top view of the apparatus shown in  FIG. 20  according to one or more aspects of the present disclosure. 
         FIG. 22  is a top view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 23  is a side view of the apparatus shown in  FIG. 22  according to one or more aspects of the present disclosure. 
         FIG. 24  is a perspective view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 25  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 26  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 27  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 28  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 29  is a perspective view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 30  is a top view of the apparatus shown in  FIG. 20  according to one or more aspects of the present disclosure. 
         FIG. 31  is a schematic view of at least a portion of an example implementation of apparatus according to one or more aspects of the present disclosure. 
         FIG. 32  is a flow-chart diagram of at least a portion of an example implementation of a method according to one or more aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     It is to be understood that the following disclosure provides many different embodiments, or examples, for implementing different features of various embodiments. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for simplicity and clarity, and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Moreover, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed interposing the first and second features, such that the first and second features may not be in direct contact. It should also be understood that the terms “first,” “second,” “third,” etc., are arbitrarily assigned, are merely intended to differentiate between two or more parts, fluids, etc., and do not indicate a particular orientation or sequence. 
     The present disclosure introduces one or more aspects related to utilizing one or more pressure exchangers to divert a corrosive, abrasive, and/or solids-laden fluid (i.e., dirty fluid) away from high-pressure pumps, instead of pumping such fluid with the high-pressure pumps. A non-corrosive, non-abrasive, and solids-free fluid (i.e., clean fluid) may be pressurized by the high-pressure pumps, while the pressure exchangers, located downstream from the high-pressure pumps, transfer the pressure from the pressurized clean fluid to a low-pressure dirty fluid. Such use of pressure exchangers may facilitate improved fluid control during well treatment operations and/or increased functional life of the high-pressure pumps and other wellsite equipment fluidly coupled between the high-pressure pumps and the pressure exchangers. 
     As used herein, a “fluid” is a substance that can flow and conform to the outline of its container when the substance is tested at a temperature of 71° F. (22° C.) and a pressure of one atmosphere (atm) (0.1 megapascals (MPa)). A fluid may be liquid, gas, or both. A fluid may be water based or oil based. A fluid may have just one phase or more than one distinct phase. A fluid may be a heterogeneous fluid having more than one distinct phase. Example heterogeneous fluids within the scope of the present disclosure include a solids-laden fluid or slurry (such as may comprise a continuous liquid phase and undissolved solid particles as a dispersed phase), an emulsion (such as may comprise a continuous liquid phase and at least one dispersed phase of immiscible liquid droplets), a foam (such as may comprise a continuous liquid phase and a dispersed gas phase), and mist (such as may comprise a continuous gas phase and a dispersed liquid droplet phase), among other examples also within the scope of the present disclosure. A heterogeneous fluid may comprise more than one dispersed phase. Moreover, one or more of the phases of a heterogeneous fluid may be or comprise a mixture having multiple components, such as fluids containing dissolved materials and/or undissolved solids. 
     Plunger pumps may be employed in high-pressure oilfield pumping applications, such as for hydraulic fracturing applications. Plunger pumps are often referred to as positive displacement pumps, intermittent duty pumps, triplex pumps, quintuplex pumps, or frac pumps. Multiple plunger pumps may be employed simultaneously in large-scale operations where tens of thousands of gallons of fluid are pumped into a wellbore. These pumps are linked to each other with a manifold, which is plumbed to collect the output of the multiple pumps and direct it to the wellbore. 
     As described above, some fluids (e.g., fracturing fluid) may contain ingredients that are abrasive to the internal components of a pump. For example, a fracturing fluid generally contains proppant or other solid particulate material, which is insoluble in a base fluid. To create fractures, the fracturing fluid may be pumped at high-pressures ranging, for example, between about 5,000 to about 15,000 pounds force per square inch (psi) or more. The proppant may initiate the fractures and/or keep the fractures propped open. The propped fractures provide highly permeably flow paths for oil and gas to flow from the subterranean formation, thereby enhancing the production of a well. However, the abrasive fracturing fluid may accelerate wear of the internal components of the pumps. Consequently, the repair, replacement, and maintenance expenses of the pumps can be quite high, and life expectancy can be low. 
     Example implementations of apparatus described herein relate generally to a fluid system for forming and pressurizing a solids-laden fluid (e.g., fracturing fluid) having predetermined concentrations of solid material for injection into a wellbore during well treatment operations. The fluid system may include a blending or mixing device for receiving and mixing a solids-free carrying fluid or gel and a solid material to form the solids-laden fluid. The fluid system may also include a fluid pressure exchanger for increasing pressure or otherwise energizing of the solids-laden fluid formed by the mixing device before being injected into the wellbore. The fluid pressure exchanger may be utilized to pressurize the solids-laden fluid by facilitating or permitting pressure from a pressurized solids-free fluid to be transferred to a low-pressure solids-laden fluid, among other uses. The fluid pressure exchanger may comprise one or more chambers into which the low-pressure solids-laden fluid and the pressurized solids-free fluid are conducted. The solids-free fluid may be conducted into the chamber at a higher pressure than the solids-laden fluid, and may thus be utilized to pressurize the solids-laden fluid. The pressurized solids-laden fluid is then conducted from the chamber to a wellhead for injection into the wellbore. By pumping just the solids-free fluid with the pumps and utilizing the pressure exchanger to increase the pressure of the solids-laden fluid, the useful life of the pumps may be increased. Example implementations of methods described herein relate generally to utilizing the fluid system to form and pressurize the solids-laden fluid for injection into the wellbore during well treatment operations. For clarity and ease of understanding, the corrosive, abrasive, and/or solids-laden fluids may be referred to hereinafter simply as “dirty fluids” and the non-corrosive, non-abrasive, and solids-free fluids may be referred to hereinafter simply as “clean fluids.” 
       FIG. 1  is a schematic view of an example implementation of a chamber  100  of a fluid pressure exchanger for pressurizing a dirty fluid with a clean fluid according to one or more aspects of the present disclosure. The chamber  100  includes a first end  101  and a second end  102 . The chamber  100  may include a border or boundary  103  between the dirty and clean fluids defining a first volume  104  and a second volume  105  within the chamber  100 . The boundary  103  may be a membrane that is impermeable or semi-permeable to a fluid, such as a gas. The membrane may be an impermeable membrane in implementations in which the dirty and clean fluids are incompatible fluids, or when mixing of the dirty and clean fluids is to be substantially prevented, such as to recycle the clean fluid absent contamination by the dirty fluid. The boundary  103  may be a semi-permeable membrane in implementations permitting some mixing of the clean fluid with the dirty fluid, such as to foam the dirty fluid when the clean fluid comprises a gas. 
     The boundary  103  may be a floating piston or separator slidably disposed along the chamber  100 . The floating piston may physically isolate the dirty and clean fluids and be movable via pressure differential between the dirty and clean fluids. The floating piston may be retained within the chamber  100  by walls or other features of the chamber  100 . The density of the floating piston may be set between that of the clean and dirty fluids, such as may cause gravity to locate the floating piston at an interface of the dirty and clean fluids when the chamber  100  is oriented vertically. 
     The boundary  103  may also be a diffusion or mixing zone in which the dirty and clean fluids mix or otherwise interact during pressurizing operations. The boundary  103  may also not exist, such that the first and second volumes  104  and  105  form a continuous volume within the chamber  100 . A first inlet valve  106  is operable to conduct the dirty fluid into the first volume  104  of the chamber  100 , and a second inlet valve  107  is operable to conduct the clean fluid into the second volume  105  of the chamber  100 . 
     For example,  FIG. 2  is a schematic view of the chamber  100  shown in  FIG. 1  in an operational stage according to one or more aspects of the present disclosure, during which the dirty fluid  110  has been conducted into the chamber  100  through the first inlet valve  106  at the first end  101 , such as via one or more fluid conduits  108 . Consequently, the dirty fluid  110  may move the boundary  103  within the chamber  100  along a direction substantially parallel to the longitudinal axis  111  of the chamber  100 , thereby increasing the first volume  104  and decreasing the second volume  105 . The first inlet valve  106  may be closed after entry of the dirty fluid  110  into the chamber  100 . 
       FIG. 3  is a schematic view of the chamber  100  shown in  FIG. 2  in a subsequent operational stage according to one or more aspects of the present disclosure, during which a clean fluid  120  is being conducted into the chamber  100  through the second inlet valve  107  at the second end  102 , such as via one or more fluid conduits  109 . The clean fluid  120  may be conducted into the chamber  100  at a higher pressure compared to the pressure of the dirty fluid  110 . Consequently, the higher-pressure clean fluid  120  may move the boundary  103  and the dirty fluid  110  within the chamber  100  back towards the first end  101 , thereby reducing the volume of the first volume  104  and thereby pressurizing or otherwise energizing the dirty fluid  110 . The clean fluid  120  may be a combustible or cryogenic gas that, upon combustion or heating, acts to pressurize the dirty fluid  110 , whether instead of or in addition to the higher pressure of the clean fluid  120  acting to pressurize the dirty fluid  110 . The boundary  103  and/or other components may include one or more burst discs to protect against overpressure from the clean fluid  120 . 
     As shown in  FIG. 4 , the boundary  103  may continue to reduce the first volume  104  as the pressurized dirty fluid  110  is conducted from the chamber  100  to a wellhead (not shown) at a higher pressure than when the dirty fluid  110  entered the chamber  100 , such as via a first outlet valve  112  and one or more conduits  113 . The second inlet valve  107  may then be closed, for example, in response to pressure sensed by a pressure transducer within the chamber  100  and/or along one or more of the conduits and/or inlet valves. 
     After the pressurized dirty fluid  110  is discharged from the chamber  100 , the clean fluid  120  may be drained via an outlet valve  114  at the second end  102  of the chamber  100  and one or more conduits  116 . The discharged clean fluid  120  may be stored as waste fluid or reused during subsequent iterations of the fluid pressurizing process. For example, additional quantities of the dirty and clean fluids  110 ,  120  may then be introduced into the chamber  100  to repeat the pressurizing process to achieve a substantially continuous supply of pressurized dirty fluid  110 . 
     A fluid pressure exchanger comprising the apparatus shown in  FIGS. 1-4  and/or others within the scope of the present disclosure may also comprise more than one of the example chambers  100  described above.  FIG. 5  is a schematic view of an example fluid pressure exchanger  200  comprising multiple chambers  100  shown in  FIGS. 1-4  and designated in  FIG. 5  by reference numeral  150 .  FIGS. 6 and 7  are sectional views of the pressure exchanger  200  shown in  FIG. 5 . The following description refers to  FIGS. 5-7 , collectively. 
     The pressure exchanger  200  may comprise a housing  210  having a bore  212  extending between opposing ends  208 ,  209  of the housing  210 . An end cap  202  may cover the bore  212  at the end  208  of the housing  210 , and another end cap  203  may cover the bore  212  at the opposing end  209  of the housing  210 . The housing  210  and the end caps  202 ,  203  may be sealingly engaged and statically disposed with respect to each other. The housing  210  and the end caps  202 ,  203  may be distinct components or members, or the housing  210  and one or both of the end caps  202 ,  203  may be formed as a single, integral, or continuous component or member. A rotor  201  may be slidably disposed within the bore  212  of the housing  210  and between the opposing end caps  202 ,  203  in a manner permitting relative rotation of the rotor  201  with respect to the housing  210  and end caps  202 ,  203 . The rotor  201  may have a plurality of bores or chambers  150  extending through the rotor  201  and circumferentially spaced around an axis of rotation  211  extending longitudinally through the rotor  201 . The rotor  201  may be a discrete member, as depicted in  FIGS. 5-7 , or an assembly of discrete components, such as may permit replacing worn portions of the rotor  201  and/or utilizing different materials for different portions of the rotor  201  to account for expected or actual wear. 
     The rotation of the rotor  201  about the axis  211  is depicted in  FIG. 5  by arrow  220 . Rotation of the rotor  201  may be achieved by various means. For example, rotation may be induced by utilizing force of the fluids received by the pressure exchanger  200 , such as in implementations in which the fluids may be directed into the chambers  150  at a diagonal angle with respect to the axis of rotation  211 , thereby imparting a rotational force to the rotor  201  to rotate the rotor  201 . Rotation may also be achieved by a longitudinal geometry or configuring of at least a portion of the chambers  150  as they extend through the rotor  201 . For example, an inlet portion of the each chamber  150 , or the entirety of each chamber  150 , may extend in a helical manner with respect to the axis of rotation  211 , such that the incoming stream of clean fluid imparts a rotational force to the rotor  201  to rotate the rotor  201 . 
     Rotation may also be imparted via a motor  260  operably connected to the rotor  201 . For example, the motor  260  may be an electrical or fluid powered motor connected with the rotor  201  via a shaft, a transmission, or another intermediate driving member, such as may extend through at least one of the end caps  202 ,  203  and/or the housing  210 , to transfer torque to the rotor  201  to rotate the rotor  201 . The motor  260  may also be connected with the rotor  201  via a magnetic shaft coupling, such as in implementations in which a driven magnet may be physically connected with the rotor  201  and a driving magnet may be located outside of the pressure exchanger  200  and magnetically connected with the driven magnet. Such implementations may permit the motor  260  to drive the rotor  201  without a shaft extending through the end caps  202 ,  203  and/or housing  210 . 
     Rotation may also be imparted into the rotor  201  via an electrical motor (not shown) disposed about and connected with the rotor  201 . For example, the electrical motor may comprise an electrical stator disposed about or included as part of the housing  210  and an electrical rotor connected about or included as part of the rotor  201 . The electrical stator may comprise field coils or windings that generate a magnetic field when powered by electric current from a source of electric power. The electrical rotor may comprise windings or permanent magnets fixedly disposed about or included as part of the rotor  201 . The electrical stator may surround the electrical rotor in a manner permitting rotation of the rotor  201 /electrical rotor assembly within the housing  210 /electrical stator assembly during operation of the electrical motor. The electrical motors utilized within the scope of the present disclosure may include, for example, synchronous and asynchronous electric motors. 
     The pressure exchanger  200  may also comprise means for sensing or otherwise determining the rotational speed of the rotor  201 . For example, the rotor speed sensing means may comprise one or more sensors  214  associated the rotor  201  and operable to convert position or presence of a rotating or otherwise moving portion of the rotor  201 , a feature of the rotor  201 , or a marker  215  disposed in association with the rotor  201 , into an electrical signal or information related to or indicative of the position and/or speed of the rotor  201 . Each sensor  214  may be disposed adjacent the rotor  201  or otherwise disposed in association with the rotor  201  in a manner permitting sensing of the rotor or the marker  215  during pressurizing operations. 
     Each sensor  214  may sense one or more magnets on the rotor  201 , one or more features on the rotor  201  that can be optically detected, conductive portions or members on the rotor  201  that can be sensed with an electromagnetic sensor, and/or facets or features on the rotor  201  that can be detected with an ultrasonic sensor, among other examples. Each sensor  214  may be or comprise a linear encoder, a capacitive sensor, an inductive sensor, a magnetic sensor, a Hall effect sensor, and/or a reed switch, among other examples. The speed sensing means may also include an intentionally imbalanced rotor  201  whose vibrations may be detected with an accelerometer and utilized to determine the rotational speed of the rotor  201 . 
     The sensors  214  may extend through the housing  210 , the end caps  202 ,  203 , or another pressure barrier fluidly isolating the internal portion of the pressure exchanger  201  in a manner permitting the detection of the presence of the rotor  201  or marker  215  at a selected or predetermined position. The sensor  214  and/or an electrical conductor connected with the sensor  214  may be sealed against the pressure barrier, such as to prevent or minimize fluid leakage. However, a non-magnetic housing  210  and/or end caps  202 ,  203  may be utilized, such as may permit a magnetic field to pass therethrough and, thus, permit the sensors  214  to be disposed on the outside of the housing  210  and/or end caps  202 ,  203 . The sensor  214  may also be an ultrasonic transducer operable to send a pressure wave through the housing  210  and into the rotor  201 , such as in implementations in which the housing  210  is a steel housing and the rotor  201  is a ceramic stator. The pressure wave may be reflected from varying markers or portions of the rotor  201  and sensed by the ultrasonic transducer to determine the rotational speed of the rotor  201 . 
     The end caps  202 ,  203  may functionally replace the valves  106 ,  107 ,  112 , and  114  depicted in  FIGS. 1-4 . For example, the first end cap  202  may be substantially disc-shaped, or may comprise a substantially disc-shaped portion, through which an inlet  204  and an outlet  205  extend. The inlet  204  may act as the first inlet valve  106  shown in  FIGS. 1-4 , and the outlet  205  may act as the first outlet valve  112  shown in  FIGS. 1-4 . Similarly, the second end cap  203  may be substantially disc-shaped, or may comprise a substantially disc-shaped portion, through which an inlet  206  and an outlet  207  extend. The inlet  206  may act as the second inlet valve  107  shown in  FIGS. 1-4 , and the outlet  207  may act as the second outlet valve  114  shown in  FIGS. 1-4 . The fluid inlets and outlets  204 - 207  may have a variety of dimensions and shapes. For example, as in the example implementation depicted in  FIG. 5 , the inlets and outlets  204 - 207  may have dimensions and shapes substantially corresponding to the cross-sectional dimensions and shapes of the openings of each chamber  150  at the opposing ends of the rotor  201 . However, other implementations are also within the scope of the present disclosure, provided that the chambers  150  may each be sealed against the end caps  202 ,  203  in a manner preventing or minimizing fluid leaks. For example the surfaces of the end caps  202 ,  203  that mate with the corresponding ends of the rotor  201  may comprise face seals and/or other sealing means. 
     In the example implementation depicted in  FIG. 5 , the rotor  201  comprises eight chambers  150 . However, other implementations within the scope of the present disclosure may comprise as few as two chambers  150 , or as many as several dozen. The rotational speed of the rotor  201  may also vary and may be timed as per the velocity of the boundary  103  between the dirty and clean fluids and the length  221  of the chambers  150  so that the timing of the inlets and outlets  204 - 207  are adjusted in order to facilitate proper functioning as described herein. The rotational speed of the rotor  201  may be based on the intended flow rate of the pressurized dirty fluid exiting the chambers  150  collectively, the amount of pressure differential between the dirty and clean fluids, and/or the dimensions of the chambers  150 . For example, larger dimensions of the chambers  150  and greater rotational speed of the rotor  201  relative to the end caps  202 ,  203  and housing  210  will increase the discharge volume of the pressurized dirty fluid. 
     The size and number of instances of the fluid pressure exchanger  200  utilized at a wellsite in oil and gas operations may depend on the location of the fluid pressure exchanger  200  within the process flow stream at the wellsite. For example, some oil and gas operations at a wellsite may utilize multiple pumps (such as the pumps  306  shown in  FIG. 11 ) that each receive low-pressure dirty fluid from a common manifold (such as the manifold  308  shown in  FIG. 11 ) and then pressurize the dirty fluid for return to the manifold. For such operations, an instance of the fluid pressure exchanger  200  may be utilized between each pump and the manifold, and/or one or more instances of the fluid pressure exchanger  200  may replace one or more of the pumps. In such implementations, the rotor  201  may have a length  221  ranging between about 25 centimeters (cm) and about 150 cm and a diameter  222  ranging between about 10 cm and about 30 cm, the cross-sectional area (flow area) of each chamber  150  may range between about 5 cm2 and about 20 cm2, and/or the volume of each chamber  150  may range between about 75 cubic cm (cc) and about 2500 cc. However, although other dimensions are also within the scope of the present disclosure. Some oil and gas operations at a wellsite may utilize multiple pumps that each receive low-pressure dirty fluid directly from a corresponding mixer (such as the mixer  304  shown in  FIG. 11 ) or another source of dirty fluid and then pressurize the dirty fluid for injection directly into a well (such as the well  311  shown in  FIG. 11 ). For such operations, an instance of the fluid pressure exchanger  200  may be utilized between each pump and the well, and/or one or more instances of the fluid pressure exchanger  200  may replace one or more of the pumps. 
     In some implementations, the pumps may each receive low-pressure clean fluid from the manifold (such as may be received at the manifold from a secondary fluid source) and then pressurize the clean fluid for return to the manifold. The pressurized clean fluid may then be conducted from the manifold to one or more instances of the fluid pressure exchanger  200  to be utilized to pressurize low-pressure dirty fluid received from a gel maker, proppant blender, and/or other low-pressure processing device, and the pressurized dirty fluid discharged from the fluid pressure exchangers  200  may be conducted towards a well. Examples of such operations include those shown in  FIGS. 12-16 , among other examples within the scope of the present disclosure. In such implementations, the length  221  of the rotor  201 , the diameter  222  of the rotor  201 , the flow area of each chamber  150 , the volume of each chamber  150 , and/or the number of chambers  150  may be much larger than as described above. 
       FIG. 6  is a sectional view of the pressure exchanger  200  shown in  FIG. 5  during an operational stage in which two of the chambers are substantially aligned with the inlet and outlet  204 ,  205  of the first end cap  202  but not with the inlet and outlet  206 ,  207  of the second end cap  203 . Thus, the inlet  204  fluidly connects one of the depicted chambers  150 , designated by reference number  250  in  FIG. 6 , with the one or more conduits  108  supplying the non-pressurized dirty fluid, such that the non-pressurized dirty fluid may be conducted into the chamber  250 . At the same time, the outlet  205  fluidly connects another of the depicted chambers  150 , designated by reference number  251  in  FIG. 6 , with the one or more conduits  113  conducting previously pressurized dirty fluid out of the chamber  251 , such as for conduction into a wellbore (not shown). As the rotor  201  rotates relative to the end caps  202 ,  203 , the chambers  250 ,  251  will rotate out of alignment with the inlet and outlet  204 ,  205 , thus preventing fluid communication between the chambers  250 ,  251  and the respective conduits  108 ,  113 . 
       FIG. 7  is another view of the apparatus shown in  FIG. 6  during another operational stage in which the chambers  250 ,  251  are substantially aligned with the inlet and outlet  206 ,  207  of the second end cap  203  but not with the inlet and outlet  204 ,  205  of the first end cap  202 . Thus, the inlet  206  fluidly connects the chamber  250  with the one or more conduits  109  supplying the pressurizing or energizing clean fluid, such that the clean fluid may be conducted into the chamber  250 . At the same time, the outlet  207  fluidly connects the other chamber  251  with the one or more conduits  116  conducting previously used pressurizing clean fluid out of the chamber  251 , such as for recirculation to the clean fluid source (not shown). As the rotor  201  further rotates relative to the end caps  202 ,  203  and the housing  210 , the chambers  250 ,  251  will rotate out of alignment with the inlet and outlet  206 ,  207 , thus preventing fluid communication between the chambers  250 ,  251  and the respective conduits  109 ,  116 . 
     The pressurizing process described above with respect to  FIGS. 1-4  is achieved within each chamber  150 ,  250 ,  251  with each full rotation of the rotor  201  relative to the end caps  202 ,  203 . For example, as the rotor  201  rotates relative to the end caps  202 ,  203  and the housing  210 , the non-pressurized dirty fluid is conducted into the chamber  250  during the portion of the rotation in which the chamber  250  is in fluid communication with inlet  204  of the first end cap  202 , as indicated in  FIG. 6  by arrow  231 . The rotation is continuous, such that the flow rate of non-pressurized dirty fluid into the chamber  250  increases as the chamber  250  comes into alignment with the inlet  204  and then decreases as the chamber  250  rotates out of alignment with the inlet  204 . Further rotation of the rotor  201  relative to the end caps  202 ,  203  permits the pressurizing clean fluid to be conducted into the chamber  250  during the portion of the rotation in which the chamber  250  is in fluid communication with the inlet  206  of the second end cap  203 , as indicated in  FIG. 7  by arrow  232 . The influx of the pressurizing clean fluid into the chamber  250  pressurizes the dirty fluid, such as due to the pressure differential between the dirty and clean fluids described above with respect to  FIGS. 1-4 . 
     Further rotation of the rotor  201  relative to the end caps  202 ,  203  and the housing  210  permits the pressurized dirty fluid to be conducted out of the chamber  250  during the portion of the rotation in which the chamber  250  is in fluid communication with the outlet  205  of the first end cap  202 , as indicated in  FIG. 6  by arrow  233 . The discharged fluid may substantially comprise just the (pressurized) dirty fluid or a mixture of the dirty and clean fluids (also pressurized), depending on the timing of the rotor  201  and perhaps whether the chambers include the boundary  103  shown in  FIGS. 1-4 . Further rotation of the rotor  201  relative to the end caps  202 ,  203  permits the reduced-pressure clean fluid to be conducted out of the chamber  250  during the portion of the rotation in which the chamber  250  is in fluid communication with the outlet  207  of the second end cap  203 , as indicated in  FIG. 7  by arrow  234 . The pressurizing process then repeats as the rotor  201  further rotates and the chamber  250  again comes into alignment with the inlet  204  of the first end cap  202 . 
     Depending on the number and size of the chambers  150 , the non-pressurized dirty fluid inlet  204  and the pressurizing clean fluid inlet  206  may be wholly or partially misaligned with each other about the central axis  211 , such that the dirty fluid may be conducted into the chamber  150  to entirely or mostly fill the chamber  150  before the clean fluid is conducted into that chamber  150 . The non-pressurized dirty fluid inlet  204  is completely closed to fluid flow from the conduit  108  before the pressurizing clean fluid inlet  206  begins opening. The pressurized dirty fluid outlet  205  and the reduced-pressure clean fluid outlet  207 , however, may be partially open when the pressurizing clean fluid inlet  206  is permitting the clean fluid into the chamber  150 . Similarly, the non-pressurized dirty fluid inlet  204  may be partially open when one or both of the pressurized dirty fluid outlet  205  and/or the reduced-pressure clean fluid outlet  207  is at least partially open. 
     The pressurized dirty fluid outlet  205  and the reduced-pressure clean fluid outlet  207  may be wholly or partially misaligned with each other about the central axis  211 . For example, the pressurized dirty fluid (and perhaps a pressurized mixture of the dirty and clean fluids) may be substantially discharged from a chamber  150  via the pressurized dirty fluid outlet  205  before the remaining reduced-pressure clean fluid is permitted to exit through the reduced-pressure clean fluid outlet  207 . As the rotor  201  continues to rotate relative to the end caps  202 ,  203  and the housing  210 , the pressurized dirty fluid outlet  205  becomes closed to fluid flow, and the reduced-pressure clean fluid outlet  207  becomes open to discharge the remaining reduced-pressure clean fluid. Thus, the reduced-pressure clean fluid outlet  207  may be completely closed to fluid flow while the pressurized dirty fluid (or mixture of the dirty and clean fluids) is discharged from the chamber  150  to the wellhead. Complete closure of the reduced-pressure clean fluid outlet  207  may permit the pressurized fluid to maintain a higher-pressure flow to the wellhead. 
     The inlets and outlets  204 - 207  may also be configured to permit fluid flow into and out of more than one chamber  150  at a time. For example, the non-pressurized dirty fluid inlet  204  may be sized to simultaneously fill more than one chamber  150 , the inlet and outlets  204 - 207  may be configured to permit non-pressurized dirty fluid to be conducted into a chamber  150  while the reduced-pressure clean fluid is simultaneously being discharged from that chamber  150 . Depending on the size of the rotor  201  and the chambers  150 , the fluid properties of the dirty and clean fluids, and the rotational speed of the rotor  201  relative to the end caps  202 ,  203 , the pressurizing process within each chamber  150  may also be achieved in less than one rotation of the rotor  201  relative to the end caps  202 ,  203  and the housing  210 , such as in implementations in which two, three, or more iterations of the pressurizing process is achieved within each chamber  150  during a single rotation of the rotor  201 . 
     The flow of dirty fluid out of the pressure exchanger  200  via the fluid conduit  116  may be prevented or otherwise minimized by controlling the timing of the opening and closing of the fluid inlets  204 ,  206  and outlets  205 ,  207  of the pressure exchanger  200 . For example, during the pressurizing operations, as the chambers  150  rotate, each chamber  150  is in turn aligned and, thus, fluidly connected with the low-pressure inlet  204  to receive the dirty fluid and the low-pressure outlet  207  to discharge the clean fluid. As the dirty fluid fills the chamber  150 , the boundary  103  moves toward the low-pressure outlet  207  as the clean fluid is pushed out of the chamber  150 . However, the rotation of the rotor  201  seals off the outlet  207  of the chamber  150  when or just before the boundary  103  reaches the outlet  207  to prevent or minimize the dirty fluid from entering into the fluid conduit  116 . The chamber  150  then becomes aligned with the high-pressure inlet  206  and the high-pressure outlet  205  to permit the high-pressure clean fluid to enter the chamber  150  via the inlet  206  to push the dirty fluid from the chamber  150  via the outlet  205  at an increased pressure. As the clean fluid fills the chamber  150 , the boundary  103  moves toward the high-pressure outlet  205  as the dirty fluid is pushed out of the chamber  150 . However, the rotation of the rotor  201  seals off the outlet  205  of the chamber  150  when or just before the boundary  103  reaches the outlet  205  to prevent or minimize the clean fluid from entering into the fluid conduit  113 . The clean fluid left in the chamber  150  may be pushed out through the fluid conduit  116  by the dirty fluid when the chamber  150  again becomes aligned with the low-pressure inlet  204  to receive the dirty fluid and the low-pressure outlet  207  to discharge the clean fluid. Such cycle may be continuously repeated to continuously receive and pressurize the stream of dirty fluid to form a substantially continuous or uninterrupted stream of dirt fluid. 
       FIGS. 8 and 9  are enlarged views of portions of the pressure exchanger  200  shown in  FIGS. 7 and 6 , respectively, according to one or more aspects of the present disclosure. The following description refers to  FIGS. 6-9 , collectively. 
     Small gaps or spaces  261 ,  262 ,  263  may be maintained between the rotor  201  and the housing  210  and end caps  202 ,  203  to permit rotation of the rotor  201  within the housing  210  and the end caps  202 ,  203 . For clarity, the housing  210  and the end caps  202 ,  203  may be collectively referred to hereinafter as a “housing assembly.” The spaces  261 ,  262 ,  263  may permit fluid flow between the rotor  201  and the housing assembly. For example, dirty fluid within the pressure exchanger  200  may flow through the space  261  along the end cap  202  from the high-pressure outlet  205  to the low-pressure fluid inlet  204 , and through the spaces  261 ,  262 ,  263  along the housing  210  and end caps  202 ,  203  from the high-pressure outlet  205  to the clean fluid low-pressure outlet  207 . Clean fluid within the pressure exchanger  200  may flow through the space  263  along the end cap  203  from the high-pressure inlet  206  to the low-pressure outlet  207 , as indicated by arrow  265 , and through the spaces  261 ,  262 ,  263  along the housing  210  and end caps  202 ,  203  from the high-pressure inlet  206  to the dirty fluid inlet and outlet  204 ,  205 , as indicated by arrows  265 ,  266 ,  267 . 
     The fluid flow through the spaces  261 ,  262 ,  263  within the pressure exchanger  200  may form a fluid film or layer operating as a hydraulic bearing or otherwise providing lubrication between the rotating rotor  201  and the static housing assembly, such as may prevent or reduce contact or friction between the rotor  201  and the housing assembly during pressurizing operations. The flow of fluids through the spaces  261 ,  262 ,  263  may be biased such that substantially just the clean fluid, and not the dirty fluid, flows through the spaces  261 ,  262 ,  263  during pressurizing operations, as indicated by arrows  265 ,  266 ,  267 . Biasing the flow of clean fluid through the spaces  261 ,  262 ,  263  may also cause the clean/dirty fluid boundary  103  (shown in  FIGS. 1-4 ) to maintain a net velocity directed toward the dirty fluid outlet  205 . Accordingly, biasing the flow of clean fluid may result in substantially just the clean fluid being communicated through the spaces  261 ,  262 ,  263 , such as to prevent or minimize friction or wear caused by the dirty fluid between the rotor  201  and the housing assembly. Biasing the flow of the clean fluid may also result in substantially just the clean fluid being discharged via the clean fluid outlet  207 , such as to prevent or minimize contamination of the clean fluid discharged from the pressure exchanger  200 . 
       FIG. 10  is a sectional view of another example implementation of the pressure exchanger  200  shown in  FIG. 5  according to one or more aspects of the present disclosure and designated in  FIG. 10  by reference numeral  270 . The pressure exchanger  270  is substantially similar in structure and operation to the pressure exchanger  200 , including where indicated by like reference numbers, except as described below. 
     The pressure exchanger  270  may include a rotor  272  slidably disposed within the bore of the housing  210  and between the opposing end caps  202 ,  203  in a manner permitting relative rotation of the rotor  272  with respect to the housing  210  and end caps  202 ,  203 . The rotor  272  may have multiple bores or chambers  274  extending through the rotor  272  between the opposing ends  208 ,  209  of the housing  210  and circumferentially spaced around an axis of rotation  276  extending longitudinally along the rotor  272 . For the sake of clarity, cross-hatching of the rotor  272  is removed from  FIG. 10 , and just four chambers  274  are depicted, it being understood that other chambers  274  may also exist. 
     The chambers  274  extend through the rotor  272  in a helical manner about or otherwise with respect to the axis of rotation  276 . As described above, such helical chamber implementations may be utilized to impart rotation to the rotor  272  instead of with a separate motor  260  or other rotary driving means. Such helical chamber implementations may also permit the length  278  of the chambers  274  to be greater than the axial length  280  of the rotor  272 , which may permit the axial length  280  of the rotor  272  to be reduced. The increased length  278  of the chambers  274  may also permit the rotor  272  to be rotated at slower speeds than a rotor having chambers that extend substantially parallel with respect to an axis of rotation. 
     The pressure exchangers  200 ,  270  shown in  FIGS. 5-10  and/or otherwise within the scope of the present disclosure may utilize various forms of the dirty and clean fluids described above. For example, the dirty fluid may be a high-density and/or high-viscosity solids-laden fluid comprising insoluble solid particulate material and/or other ingredients that may compromise the life or maintenance of pumps disposed downstream of the fluid pressure exchangers  200 ,  270 , especially when such pumps are operated at higher pressures. Examples of the dirty fluid utilized in oil and gas operations may include treatment fluid, drilling fluid, spacer fluid, workover fluid, a cement composition, fracturing fluid, acidizing fluid, stimulation fluid, and/or combinations thereof, among other examples also within the scope of the present disclosure. The dirty fluid may be a foam, slurry, emulsion, or compressible gas. The viscosity of the dirty fluid may be sufficient to permit transport of solid additives or other solid particulate material (collectively referred to hereinafter as “solids”) without appreciable settling or segregation. Chemicals, such as biopolymers (e.g. polysaccharides), synthetic polymers (e.g. polyacrylamide and its derivatives), crosslinkers, viscoelastic surfactants, oil gelling agents, low molecular weight organogelators, and phosphate esters, may also be included in the dirty fluid, such as to control viscosity of the dirty fluid. 
     The composition of the clean fluid may permit the clean fluid to be pumped at higher pressures with reduced adverse effects on the downstream pumps. For example, the clean fluid may be a solids-free fluid that does not include insoluble solid particulate material or other abrasive ingredients, or a fluid that includes low concentrations of insoluble solid particulate material or other abrasive ingredients. The clean fluid may be a liquid, such as water (including freshwater, brackish water, or brine), a gas (including a cryogenic gas), or combinations thereof. The clean fluid may also include substances, such as tracers, that can be transferred to the dirty fluid upon mixing within the chambers  150 ,  250 ,  274  or upon transmission through a semi-permeable implementation of the boundary  103 . The viscosity of the clean fluid may also be increased, such as to minimize or reduce viscosity contrast between the dirty and clean fluids. Viscosity contrast may result in channeling of the lower viscosity fluid through the higher viscosity fluid. The clean fluid may be viscosified utilizing the same chemicals and/or techniques described above with respect to the dirty fluid. 
     The clean and/or dirty fluid may be chemically modified, such as via one or more fluid additives temporarily (or regularly) injected into the clean and/or dirty fluids to produce a reaction at the clean/dirty boundary  103  that acts to stabilize the boundary  103  (e.g., a membrane, mixing zone). For example, viscosity modification may be utilized to help form a substantially flat flow profile within the chambers  150 ,  250 ,  274 . Also, one or repeated pulses of a cross linker applied to the clean fluid may be utilized to form cross linked gel pills in the chambers  150 ,  250 ,  274  to act as boundary stabilizers. Such stabilizers may be safely pumped into the well and replaced over time. 
     Furthermore, the clean and dirty fluids may be selected or formulated such that a reaction between the clean and dirty fluids creates a physical change at the clean/dirty boundary  103  that stabilizes the boundary  103 . For example, the clean and dirty fluids may cross-link when interacting at the boundary  103  to produce a floating, viscous plug. The clean and dirty fluids may be formulated such that the plug or another product of such reaction may not damage downstream components when trimmed off and injected into the well by the action of the outlet  205  or another discharge valve. 
     The following are additional examples of the dirty and clean fluids that may be utilized during oil and gas operations. However, the following are merely examples, and are not considered to be limiting to the dirty and clean fluids and that may also be utilized within the scope of the present disclosure. 
     For fracturing operations, the dirty fluid may be a slurry with a continuous phase comprising water and a dispersed phase comprising proppant (including foamed slurries), including implementations in which the dispersed proppant includes two or more different size ranges and/or shapes, such as may optimize the amount of packing volume within the fractures. The dirty fluid may also be a cement composition (including foamed cements), or a compressible gas. For such fracturing implementations, the clean fluid may be a liquid comprising water, a foam comprising water and gas, a gas, a mist, or a cryogenic gas. 
     For cementing operations, including squeeze cementing, the dirty fluid may be a cement composition comprising water as a continuous phase and cement as a dispersed phase, or a foamed cement composition. For such cementing implementations, the clean fluid may be a liquid comprising water, a foam comprising water and gas, a gas, a mist, or a cryogenic gas. 
     For drilling, workover, acidizing, and other wellbore operations, the dirty fluid may be a homogenous solution comprising water, soluble salts, and other soluble additives, a slurry with a continuous phase comprising water and a dispersed phase comprising additives that are insoluble in the continuous phase, an emulsion or invert emulsion comprising water and a hydrocarbon liquid, or a foam of one or more of these examples. In such implementations, the clean fluid may be a liquid comprising water, a foam comprising water and gas, a gas, a mist, or a cryogenic gas. 
     In the above example implementations, and/or others within the scope of the present disclosure, the dirty fluid  110  may include proppant; swellable or non-swellable fibers; a curable resin; a tackifying agent; a lost-circulation material; a suspending agent; a viscosifier; a filtration control agent; a shale stabilizer; a weighting agent; a pH buffer; an emulsifier; an emulsifier activator; a dispersion aid; a corrosion inhibitor; an emulsion thinner; an emulsion thickener; a gelling agent; a surfactant; a foaming agent; a gas; a breaker; a biocide; a chelating agent; a scale inhibitor; a gas hydrate inhibitor; a mutual solvent; an oxidizer; a reducer; a friction reducer; a clay stabilizing agent; an oxygen scavenger; cement; a strength retrogression inhibitor; a fluid loss additive; a cement set retarder; a cement set accelerator; a light-weight additive; a de-foaming agent; an elastomer; a mechanical property enhancing additive; a gas migration control additive; a thixotropic additive; and/or combinations thereof. 
       FIG. 11  is a schematic view of an example wellsite system  370  that may be utilized for pumping a fluid from a wellsite surface  310  to a well  311  during a well treatment operation. Water from a plurality of water tanks  301  may be substantially continuously pumped to a gel maker  302 , which mixes the water with a gelling agent to form a carrying fluid or gel, which may be a clean fluid. The gel may be substantially continuously pumped into a blending/mixing device, hereinafter referred to as a mixer  304 . Solids, such as proppant and/or other solid additives stored in a solids container  303 , may be intermittently or substantially continuously pumped into the mixer  304  to be mixed with the gel to form a substantially continuous stream or supply of treatment fluid, which may be a dirty fluid. The treatment fluid may be pumped from the mixer  304  to a plurality of plunger, frac, and/or other pumps  306  through a system of conduits  305  and a manifold  308 . Each pump  306  pressurizes the treatment fluid, which is then returned to the manifold  308  through another system of conduits  307 . The stream of treatment fluid is then directed to the well  311  via a wellhead  313  through a system of conduits  309 . A control unit  312  may be operable to control various portions of such processing via wired and/or wireless communications (not shown). 
       FIG. 12  is a schematic view of an example implementation of another wellsite system  371  according to one or more aspects of the present disclosure. The wellsite system  371  comprises one or more similar features of the wellsite system  370  shown in  FIG. 11 , including where indicated by like reference numbers, except as described below. 
     The wellsite system  371  includes a fluid pressure exchanger  320 , which may be utilized to eliminate or reduce pumping of dirty fluid through the pumps  306 . The dirty fluid may be conducted from the mixer  304  to one or more chambers  100 / 150 / 250 / 251 / 274  of the fluid pressure exchanger  320  via the conduit system  305 . The fluid pressure exchanger  320  may be, comprise, and/or otherwise have one or more aspects in common with the apparatus shown in one or more of  FIGS. 1-10 . Thus, as similarly described above with respect to  FIGS. 1-10 , the fluid pressure exchanger  320  comprises a non-pressurized dirty fluid inlet  331 , a pressurized clean fluid inlet  332 , a pressurized fluid discharge or outlet  333 , and a reduced-pressure fluid discharge or outlet  334 . Consequently, the pumps  306  may conduct the clean fluid to and from the manifold  308  and then to the pressurized clean fluid inlet  332  of the fluid pressure exchanger  320 , where the pressurized clean fluid may be utilized to pressurize the dirty fluid received at the non-pressurized dirty fluid inlet  331  from the mixer  304 . 
     A centrifugal or other type of pump  314  may supply the clean fluid to the manifold  308  from a holding or frac tank  322  through a conduit system  315 . An additional source of fluid to be pressurized by the manifold  308  may be flowback fluid from the well  311 . The pressurized clean fluid is conducted from the manifold  308  to one or more chambers of the fluid pressure exchanger  320  via a conduit system  316 . The pressurized fluid discharged from the fluid pressure exchanger  320  is then conducted to the wellhead  313  of the well  311  via a conduit system  309 . The reduced-pressure clean fluid remaining in the fluid pressure exchanger  320  (or chamber  100 / 150  thereof) may then be conducted to a settling tank/pit  318  via a conduit system  317 , where the fluid may be recycled back into the high-pressure stream via a centrifugal or other type of pump  321  and a conduit system  319 , such as to the tank  322 . 
     The wellsite system  371  may further comprise pressure sensors  350  operable to generate electric signals and/or other information indicative of pressure of the clean fluid upstream of the pressure exchanger  320  and/or pressure of the dirty fluid discharged from the pressure exchanger  320 . For example, the pressure sensors  350  may be fluidly connected along the fluid conduits  309 ,  316 . Additional pressure sensors may also be fluidly connected along the fluid conduits  305 ,  317  such as may be utilized to monitor pressure of the low-pressure clean and dirty fluids. 
     Some of the components, such as conduits, valves, and the manifold  308 , may be configured to provide dampening to accommodate pressure pulsations. For example, liners that expand and contract may be employed to prevent problems associated with pumping against a closed valve due to intermittent pumping of the high-pressure fluid stream. 
       FIG. 13  is a schematic view of an example implementation of another wellsite system  372  according to one or more aspects of the present disclosure. The wellsite system  372  comprises one or more similar features of the wellsite systems  370 ,  371  shown in  FIGS. 11 and 12 , respectively, including where indicated by like reference numbers, except as described below. 
     In the wellsite system  372 , the clean fluid may be conducted to the manifold  308  via a conduit system  330 , the pump  314 , and the conduit system  315 . That is, the fluid stream leaving the gel maker  302  may be split into a low-pressure side, for utilization by the mixer  304 , and a high-pressure side, for pressurization by the manifold  308 . Similarly, although not depicted in  FIG. 13 , the fluid stream entering the gel maker  302  may be split into the low-pressure side, for utilization by the gel maker  302 , and the high-pressure side, for pressurization by the manifold  308 . Thus, the clean fluid stream and the dirty fluid stream may have the same source, instead of utilizing the tank  322  or other separate clean fluid source.  FIG. 13  also depicts the option for the reduced-pressure fluid discharged from the fluid pressure exchanger  320  to be recycled back into the low-pressure clean fluid stream between the gel maker  302  and the mixer  304  via a conduit system  343 . In such implementations, the flow rate of the proppant and/or other ingredients from the solids container  303  into the mixer  304  may be regulated based on the concentration of the proppant and/or other ingredients entering the low-pressure stream from the conduit system  343 . The flow rate from the solids container  303  may be adjusted to decrease the concentration of proppant and/or other ingredients based on the concentrations in the fluid being recycled into the low-pressure stream. Similarly, although not depicted in  FIG. 13 , the reduced-pressure fluid discharged from the fluid pressure exchanger  320  may be recycled back into the low-pressure flow stream before the gel maker  302 , or perhaps into the low-pressure flow stream between the mixer  304  and the fluid pressure exchanger  320 . 
       FIG. 14  is a schematic view of an example implementation of another wellsite system  373  according to one or more aspects of the present disclosure. The wellsite system  373  comprises one or more similar features of the wellsite systems  370 ,  371 ,  372  shown in  FIGS. 11, 12, and 13 , respectively, including where indicated by like reference numbers, except as described below. 
     In the wellsite system  373 , the source of the clean fluid is the tank  322 , and the reduced-pressure fluid discharged from the fluid pressure exchanger  320  is not recycled back into the high-pressure stream, but is instead directed to a tank  340  via a conduit system  341 . However, in a similar implementation, the reduced-pressure fluid discharged from the fluid pressure exchanger  320  is not recycled back into the high-pressure stream, as depicted in  FIG. 13 . In either implementation, utilizing the tank  322  or other source of the clean fluid separate from the discharge of the gel maker  302  and the fluid pressure exchanger  320  permits a single pass clean fluid system with very low probability of proppant entering the pumps  306 . 
       FIG. 15  is a schematic view of an example implementation of another wellsite system  374  according to one or more aspects of the present disclosure. The wellsite system  374  comprises one or more similar features of the wellsite systems  370 ,  371 ,  372 ,  373  shown in  FIGS. 11, 12, 13, and 14 , respectively, including where indicated by like reference numbers, except as described below. 
     Unlike the wellsite system  373 , the wellsite system  374  utilizes multiple instances of the fluid pressure exchanger  320 . The low-pressure discharge from the mixer  304  may be split into multiple streams each conducted to a corresponding one of the fluid pressure exchangers  320  via a conduit system  351 . Similarly, the high-pressure discharge from the manifold  308  may be split into multiple streams each conducted to a corresponding one of the fluid pressure exchangers  320  via a conduit system  352 . The pressurized fluid discharged from the fluid pressure exchangers  320  may be combined and conducted towards the well  311  via a conduit system  353 , and the reduced-pressure discharge from the fluid pressure exchangers  320  may be combined or separately conducted to the tank  340  via a conduit system  354 . 
       FIG. 16  is a schematic view of an example implementation of another wellsite system  375  according to one or more aspects of the present disclosure. The wellsite system  375  comprises one or more similar features of the wellsite systems  370 ,  371 ,  372 ,  373 ,  374  shown in  FIGS. 11, 12, 13, 14, and 15 , respectively, including where indicated by like reference numbers, except as described below. 
     Unlike the wellsite systems  370 ,  371 ,  372 ,  373 ,  374 , the wellsite system  375  comprises a plurality of pressure exchangers  320  integrated or otherwise combined as part of a manifold  380 . The manifold  380  may comprise the plurality of the pressure exchangers  320  hard-piped or otherwise integrated with or along a plurality of fluid conduits, such as may facilitate fluid connection between the pressure exchangers  320  and the pumps  306 , the source of clean fluid (e.g., the water tanks  301 ), the source of dirty fluid (e.g., the mixer  304 ), and the wellbore  311 . 
     The manifold  380  may comprise a clean fluid distribution conduit  382  fluidly connected with the water tanks  301  via a fluid conduit system  344 . The clean fluid distribution conduit  382  may split the stream of low-pressure clean fluid discharged from the tanks  301  into multiple streams each conducted to a corresponding pump  306 . The clean fluid distribution conduit  382  may include an inlet port  383  fluidly connected with a fluid conduit system  344  and a plurality of outlet ports (not numbered) each fluidly connected with an inlet port of a corresponding pump  306  via a corresponding fluid conduit  305 . A booster pump  398 , such as a centrifugal pump, may be fluidly connected along the fluid conduit system  344  to transfer the clean fluid from the tanks  301  to the manifold  380  via the conduit system  344 . The manifold  380  may further comprise a plurality of clean fluid inlet ports  381  fluidly connected with corresponding clean fluid inlets  332  of the pressure exchangers  320 . Outlet ports of the pumps  306  may be fluidly connected with corresponding clean fluid inlets  332  of the pressure exchangers  320  via fluid conduits  307  extending between the outlets ports of the pumps  306  and the corresponding clean fluid inlet ports  381  of the manifold  380 . 
     The manifold  380  may further comprise a clean fluid collection conduit  384  fluidly connected with an inlet of the mixer  304  via a fluid conduit system  345 . The clean fluid collection conduit  384  may combine the streams of low-pressure clean fluid discharged from the pressure exchangers  320  into a single stream for transfer to the mixer  304  or another destination. The clean fluid collection conduit  384  may have a plurality of inlet ports (not numbered) each fluidly connected with the clean fluid outlet  334  of a corresponding pressure exchanger  320 . The clean fluid collection conduit  384  may also have an outlet port  385  fluidly connected with the fluid conduit system  345 . 
     The manifold  380  may further comprise a dirty fluid distribution conduit  386  fluidly connected with an outlet of the mixer  304  via a fluid conduit system  346 . The dirty fluid distribution conduit  386  may split the stream of low-pressure dirty fluid discharged from the mixer  304  into multiple streams each conducted to a corresponding pressure exchanger  320 . The dirty fluid distribution conduit  386  may have an inlet port  387  fluidly connected with the fluid conduit system  346  and a plurality of outlet ports (not numbered) each fluidly connected with a dirty fluid inlet  331  of a corresponding pressure exchanger  320 . 
     The manifold  380  may further comprise a dirty fluid collection conduit  388  fluidly connected with the wellbore  311  via a fluid conduit system  347 . The dirty fluid collection conduit  388  may combine the streams of high-pressure dirty fluid discharged from the pressure exchangers  320  into a single stream for transfer to the wellbore  311 . The dirty fluid collection conduit  388  may have a plurality of inlet ports (not numbered) each fluidly connected with the dirty fluid outlet  333  of a corresponding pressure exchanger  320  and an outlet port  389  fluidly connected with the fluid conduit system  347 . 
     The fluid conduit systems  344 ,  345  may be fluidly connected via a fluid conduit system  390  extending between the fluid conduit systems  344 ,  345 . The fluid conduit system  390  may permit a selected portion of the clean fluid discharged from the pressure exchangers  320  and flowing through the fluid conduit system  345  to be directed into the fluid conduit system  344  and fed into the pumps  306  via the clean fluid distribution conduit  382 . The amount or the flow rate of the clean fluid flowing through the fluid conduit system  345  and into the mixer  304  may be adjusted via a flow control valve  391  fluidly connected along the fluid conduit system  345 . The flow control valve  391  may be fluidly connected downstream from the fluid conduit system  390 . The amount or the flow rate of the clean fluid discharged from the pressure exchangers and directed into the pumps  306  via the fluid conduit system  390  may be adjusted via a flow control valve  393  fluidly connected along the fluid conduit system  390 . The flow control valves  391 ,  393  may be or comprise flow rate control valves, such as needle valves, metering valves, butterfly valves, globe valves, or other valves operable to progressively or gradually open and close to control the flow rate of the clean fluid. Each fluid valve  391 ,  393  may be actuated remotely by a corresponding actuator  392 ,  394 , respectively, operatively coupled with the valves  391 ,  393 . The actuators may be or comprise electric actuators, such as solenoids or motors, or fluid actuators, such as pneumatic or hydraulic cylinders or rotary actuators. The fluid valves  391 ,  393  may also be actuated manually, such as by a lever (not shown). 
     The wellsite system  375  may further include one or more flow rate sensors  395 ,  396 ,  397 , such as flow meters, operably connected along the fluid conduit systems  344 ,  345 ,  390 , respectively. The flow rate sensors  395 ,  396 ,  397  may be operable to measure volumetric and/or mass flow rate of the clean fluid transferred via the respective fluid conduit systems  344 ,  345 ,  390 . The flow rate sensors  395 ,  396 ,  397  may be electrical flow rate sensors operable to generate an electrical signal or information indicative of the measured flow rates. 
     The wellsite system  375  may perform density measurements along one or more fluid conduit systems to determine and control density of the dirty fluid being formed and/or injected into the wellbore  311 . Accordingly, fluid analyzers  348 ,  349  may be disposed along the fluid conduit systems  346 ,  347  in a manner permitting monitoring of the flow rate and/or solids concentration of the fluid discharged from the mixer  304  and the manifold  380 . Each fluid analyzer  348 ,  349  may comprise a density sensor operable to measure the solids concentration or the amount of particles in the fluid, which may be indicative of the amount of proppant or other solids in the fluids conducted by the conduit systems  346 ,  347 . The density sensor may emit radiation that is absorbed by different particles in the fluid. Different absorption coefficients may exist for different particles, which may then be utilized to translate the signals or information generated by the density sensor to determine the density or solids concentration. Each fluid analyzer  348 ,  349  may also or instead comprise a flow rate sensor, such as a flow meter, operable to measure the volumetric and/or mass flow rate of the fluid. 
     Although the manifold  380  is shown as a single unit or piece of wellsite equipment, the manifold  380  may comprise a plurality of distinct units or sections detachably coupled together to form the manifold  380 .  FIG. 17-19  are schematic views of an example implementation of manifold segments  402 ,  404  comprising a portion of or otherwise utilized to form a manifold assembly  400  according to one or more aspects of the present disclosure. The manifold assembly  400  and manifold segments  402 ,  404  comprise one or more similar features of the manifold  380 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 16-19 , collectively. 
     Referring now to  FIG. 17 , the manifold segment  402  may comprise a low-pressure clean fluid conduit  412 , such as a fluid pipe, comprising opposing end openings or ports  414  and intermediate ports  416  located between the ports  414 . The conduit  412  may be or comprise a segment of the clean fluid distribution conduit  382 . The end ports  414  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of low-pressure clean fluid conduits of other manifold segments. Each port  416  may be or comprise a fluid conduit terminating with a coupling, such as a flange, a boss coupling, and a threaded connector, among other examples, operable to fluidly connect with a corresponding port or fluid connector of the fluid conduit  305  to fluidly connect an inlet of a corresponding pump  306  with the clean fluid conduit  412 . The ports  416  may extend to one side of the manifold segment  402  if the corresponding pumps  306  are located on one side of the manifold segment  402  or the ports  416  may extend on opposite sides of the manifold segments  402  if the corresponding pumps  306  are located on the opposite sides of the manifold segment  402 . A fluid valve  418  may be connected at or along each port  416 . 
     The manifold segment  402  may further comprise ports  430 , each fluidly connected with the high-pressure clean fluid inlet  332  of a corresponding pressure exchanger  320 . Each port  430  may be or comprise a fluid conduit terminating with a coupling, such as a flange, a boss coupling, a threaded connector, among other examples, operable to fluidly connect with a corresponding port or fluid connector of the fluid conduit  307  to fluidly connect an outlet of a corresponding pump  306  with the fluid inlet  332  of a corresponding pressure exchanger  320 . The ports  430  may extend to one side of the manifold segment  402  if the corresponding pumps  306  are located on one side of the manifold segment  402  or the ports  430  may extend on opposite sides of the manifold segments  402  if the corresponding pumps  306  are located on the opposite sides of the manifold segment  402 . A fluid valve  419  may be connected at or along each port  430 . 
     The manifold segment  402  may further comprise a low-pressure clean fluid conduit  422 , such as a fluid pipe, comprising opposing end openings or ports  424  and an intermediate ports  426  located between the ports  424 . The conduit  422  may be or comprise a segment of the clean fluid collection conduit  384 . The end ports  424  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of low-pressure clean fluid conduits of other manifold segments. The ports  426  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure clean fluid outlet ports  334  of the pressure exchangers  320 . A fluid valve  428  may be connected at or along each port  426 . 
     The manifold segment  402  may further comprise a high-pressure dirty fluid conduit  432 , such as a fluid pipe, comprising opposing end openings or ports  434  and intermediate ports  436  located between the ports  434 . The conduit  432  may be or comprise a segment of the dirty fluid collection conduit  388 . The end ports  434  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of high-pressure dirty fluid conduits of other manifold segments. The intermediate ports  436  may be or comprise fluid conduits terminating with couplings fluidly connected with the high-pressure dirty fluid outlet ports  333  of the pressure exchangers  320 . A fluid valve  438  may be connected at or along each port  436 . 
     The manifold segment  402  may also comprise a low-pressure dirty fluid conduit  442 , such as a fluid pipe, comprising opposing end openings or ports  444  and intermediate ports  446  located between the ports  444 . The conduit  442  may be or comprise a segment of the dirty fluid distribution conduit  386 . The end ports  444  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of low-pressure dirty fluid conduits of other manifold segments. The intermediate ports  446  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure dirty fluid inlet ports  331  of the pressure exchangers  320 . A fluid valve  448  may be connected at or along each port  446 . 
     Each pressure exchanger  320  may have a rotary actuator  335  operatively connected thereto. The rotary actuator  335  may be connected with a rotor (not shown) of the pressure exchanger  320 , such as may impart rotation to the rotor. The rotary actuator  335  may be an electrical or fluid powered motor connected with the rotor via a shaft, a transmission, or another intermediate driving member (not shown) operable to transfer torque from the rotary actuator  335  to the rotor. 
     The fluid valves  418 ,  419  may be or comprise fluid shut-off valves, such as ball valves, globe valves, butterfly valves, and/or other types of fluid valves, which may be selectively opened and closed to permit and prevent fluid flow through the ports  416 ,  430 . Each fluid valve  418 ,  419  may be actuated manually, such as by a lever (not shown). However, each fluid valve  418 ,  419  may be actuated remotely by a corresponding actuator (not shown), such as an electric actuator, such as a solenoid or motor, or a fluid actuator, such as pneumatic or hydraulic cylinder or rotary actuator. The fluid valves  428 ,  438 ,  448  may be or comprise fluid shut-off valves, such as ball valves, globe valves, butterfly valves, and/or other types of fluid valves, which may be selectively opened and closed to permit and prevent fluid flow. The fluid valves  428 ,  438 ,  448  may instead be or comprise flow rate control valves, such as needle valves, metering valves, butterfly valves, globe valves, or other valves operable to progressively or gradually open and close to control the fluid flow rate. Each fluid valve  428 ,  438 ,  448  may be actuated remotely by a corresponding actuator (not numbered) operatively coupled with the fluid valves  428 ,  438 ,  448 . The actuators may be or comprise electric actuators, such as solenoids or motors, or fluid actuators, such as pneumatic or hydraulic cylinders or rotary actuators. The fluid valves  428 ,  438 ,  448  may also be actuated manually, such as by a lever (not shown). 
     Although the manifold segment  402  is shown comprising two pressure exchangers  320  and two sets of corresponding ports  416 ,  426 ,  430 ,  436 ,  446 , manifold segments within the scope of the present disclosure may also comprise one, three, four, five, six, or more pressure exchangers  320  and corresponding sets of ports  416 ,  426 ,  430 ,  436 ,  446 .  FIG. 18  is a schematic view of an example implementation of a manifold segment  404  comprising four pressure exchangers  320  and four sets of corresponding ports  416 ,  426 ,  430 ,  436 ,  446 . The manifold segment  404  comprises one or more similar features of the manifold segment  402 , including where indicated by like reference numbers, except as described below. 
     The manifold segment  404  may comprise a low-pressure clean fluid conduit  462  comprising opposing end openings or ports  414  and four intermediate ports  416  located between the ports  414 . The conduit  462  may be or comprise a segment of the clean fluid distribution conduit  382 . The manifold segment  404  may further comprise a low-pressure clean fluid conduit  472  comprising opposing end openings or ports  424  and four intermediate ports  426  located between the ports  424 . The conduit  472  may be or comprise a segment of the clean fluid collection conduit  384 . The manifold segment  404  may further comprise four ports  430 , each fluidly connected with the high-pressure clean fluid inlet  332  of a corresponding pressure exchanger  320 . Each set of ports  416 ,  430  may be fluidly coupled with a corresponding pump  306 , such as via intermediate fluid conduits  305 ,  307 . The manifold segment  404  may further comprise a high-pressure dirty fluid conduit  482  comprising opposing end openings or ports  434  and four intermediate ports  436  located between the ports  434 . The conduit  482  may be or comprise a segment of the dirty fluid collection conduit  388 . The manifold segment  402  may also comprise a low-pressure dirty fluid conduit  492  comprising opposing end openings or ports  444  and four intermediate ports  446  located between the ports  444 . The conduit  492  may be or comprise a segment of the dirty fluid distribution conduit  386 . As described above, the ports  426 ,  436 ,  446  may connect the conduits  472 ,  482 ,  492 , respectively, with corresponding ports of the pressure exchangers  320 . 
     Similar as described above, each pressure exchanger  320  may have a rotary actuator  335  operatively connected thereto. The rotary actuator  335  may be connected with a rotor (not shown) of the pressure exchanger  320 , such as may impart rotation to the rotor. 
     Each manifold segment  402 ,  404  may further comprise a multi-conductor cable (shown in  FIGS. 17 and 18  as dashed lines), hereinafter referred to as a conductor  406 ,  408 , extending between opposing ends or sides of a corresponding manifold segment  402 ,  404 . The conductors  406 ,  408  may be operable to communicatively and electrically connect the manifold segments  402 ,  404  with adjacent manifold segments  402 ,  404  when coupled together to form the manifold assembly  400 . Each conductor  406 ,  408  may include various electrical connectors or interfaces (not shown), such as may facilitate connection between the conductor  406 ,  408  and the various components of the manifold segment  402 ,  404  to permit signal and electrical power communication between the various components of the manifold segments  402 ,  404  and a source of control signals and electrical power, such as the control unit  312  and an electrical generator (not shown). For example, actuators of the valves  428 ,  438 ,  448  and the motors  335  of each manifold segment  402 ,  404  may be communicatively connected with each conductor  406 ,  408  via corresponding conductors (also shown as dashed lines), such as may permit transfer of electrical power, data, and/or control signals between, e.g., the control unit  312  and electrical generator and one or more of the valves  428 ,  438 ,  448  and motors  335 . Opposing ends of each conductor  406 ,  408  may terminate with or otherwise comprise electrical connectors or interfaces  407 , which may facilitate mechanical and electrical connection between conductors  406 ,  408  of adjacent manifold segments  402 ,  404  when coupled to form the manifold assembly  400 . 
     As described above, two or more of the manifold segments  402 ,  404 , or other manifold segments comprising a different number of pressure exchangers  320 , may be coupled together to form a manifold assembly within the scope of the present disclosure.  FIG. 19  is a schematic view of an example implementation of the manifold assembly  400  comprising two manifold segments  402  and one manifold segment  404 . Thus, the manifold assembly  400  comprises one or more similar features of the manifold segments  402 ,  404 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 16-19 , collectively. 
     The manifold segments  402 ,  404  may be detachably coupled together to form the manifold assembly  400  by detachably coupling corresponding end ports  414 ,  424 ,  434 ,  444  of each manifold segment  402 ,  404 . For example, the low-pressure clean fluid conduits  412 ,  462  of the manifold segments  402 ,  404  may be detachably coupled at their corresponding end ports  414  to form a low-pressure clean fluid conduit assembly  411  extending continuously along the length of the manifold assembly  400 . One of the end ports  414  at the end of the conduit assembly  411  may be fluidly isolated or closed by a closing member  413 , such as a plug, a cap, a blind flange, and the like. The end port  414  at the opposing end of the conduit assembly  411  may be fluidly connected with the conduit  344 , such as to supply low-pressure clean fluid to the pressure exchangers  320 . Furthermore, the low-pressure clean fluid conduits  422 ,  472  of the manifold segments  402 ,  404  may be coupled at their corresponding end ports  424  to form a low-pressure clean fluid conduit assembly  421  extending continuously along the length of the manifold assembly  400 . One of the end ports  424  at the end of the conduit assembly  421  may be fluidly isolated or closed by a closing member  423 . The end port  424  at the opposing end of the conduit assembly  421  may be fluidly connected with the conduit  345 , such as to receive the low-pressure clean fluid discharged by the pressure exchangers  320 . The low-pressure clean fluid conduits  432 ,  482  of the manifold segments  402 ,  404  may be coupled at their corresponding end ports  434  to form a high-pressure dirty fluid conduit assembly  431  extending continuously along the length of the manifold assembly  400 . One of the end ports  434  at the end of the conduit assembly  431  may be fluidly isolated or closed by a closing member  433 . The end port  434  at the opposing end of the conduit assembly  431  may be fluidly connected with the conduit  347 , to receive the high-pressure dirty fluid discharged by the pressure exchangers  320  for injection into the wellbore  311 . Also, the low-pressure clean fluid conduits  442 ,  492  of the manifold segments  402 ,  404  may be coupled at their corresponding end ports  444  to form a low-pressure dirty fluid conduit assembly  441  extending continuously along the length of the manifold assembly  400 . One of the end ports  444  at the end of the conduit assembly  441  may be fluidly isolated or closed by a closing member  443 . The end port  444  at the opposing end of the conduit assembly  441  may be fluidly connected with the conduit  346 , such as to supply low-pressure dirty fluid to the pressure exchangers  320 . 
     The manifold segments  402 ,  404  may be communicatively and electrically connected by coupling corresponding conductors  406 ,  408  of adjacent manifold segments  402 ,  404 . For example, the conductors  406 ,  408  of the manifold segments  402 ,  404  may be detachably coupled at their corresponding end connectors  407  to form a conductor assembly  409  extending continuously along the length of the manifold assembly  400 . The conductor assembly  409  may facilitate transfer of electrical power, data, and/or control signals between, e.g., the control unit  312  and the electrical generator and one or more of the manifold segments  402 ,  404  of the manifold assembly  400 . The conductor assembly  409  may be electrically connected with a conductor  405 , which may be electrically connected with the control unit  312  and the electrical generator to electrically connect the manifold assembly  400  with the control unit  312  and the electrical generator. 
     Although the manifold assembly  400  is shown comprising two manifold segments  402  and one manifold segment  404 , manifold assemblies within the scope of the present disclosure may comprise other quantities of manifold segments  402 ,  404  and in different combinations. For example, a manifold assembly within the scope of the present disclosure may include one or more manifold segments comprising one, two, three, four, five, six, or other quantities of pressure exchangers  320 . 
       FIGS. 20 and 21  are perspective and top views of an example implementation of a manifold segment  500  according to one or more aspects of the present disclosure. The manifold segment  500  comprises one or more similar features of the manifold segment  402 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 16-21 , collectively. 
     The manifold segment  500  may comprise a low-pressure clean fluid conduit  512 , such as a fluid pipe, comprising opposing end openings or ports  514  and intermediate ports  516  located between the ports  514 . The conduit  512  may be or comprise a segment of the clean fluid distribution conduit assembly  411 . The end ports  514  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of low-pressure clean fluid conduits of other manifold segments. Each intermediate port  516  may be or comprise a fluid conduit terminating with a coupling, such as a flange, a boss coupling, and a threaded connector, among other examples. The ports  516  may be operable to fluidly connect with corresponding fluid connectors of the fluid conduits  305  to fluidly connect inlets of the pumps  306  with the clean fluid conduit  512 . A fluid valve (not numbered) may be connected at or along each intermediate port  516 . 
     The manifold segment  500  may further comprise a low-pressure clean fluid conduit  522 , such as a fluid pipe, comprising opposing end openings or ports  524  and an intermediate ports  526  located between the ports  524 . The conduit  522  may be or comprise a segment of the clean fluid collection conduit assembly  421 . The end ports  524  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of low-pressure clean fluid conduits of other manifold segments. The intermediate ports  526  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure clean fluid outlet ports (not numbered) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected along each port  526 . Each pressure exchanger  320  may have the rotary actuator  335  operatively connected thereto. 
     The manifold segment  500  may further comprise ports  530 , each fluidly connected with the high-pressure clean fluid inlets (not numbered) of a corresponding pressure exchanger  320 . Each port  530  may be or comprise a fluid conduit terminating with a coupling, such as a flange, a boss coupling, a threaded connector, among other examples. Each port  530  may be operable to fluidly connect with a corresponding fluid connector of the fluid conduit  307  to fluidly connect an outlet of a pump  306  with the high-pressure clean fluid inlet of a corresponding pressure exchanger  320 . A fluid valve (not numbered) may be connected at or along each port  530 . 
     The manifold segment  500  may further comprise a high-pressure dirty fluid conduit  532 , such as a fluid pipe, comprising opposing end openings or ports  534  and intermediate ports  536  located between the ports  534 . The conduit  532  may be or comprise a segment of the dirty fluid collection conduit assembly  431 . The end ports  534  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of high-pressure dirty fluid conduits of other manifold segments. The intermediate ports  536  may be or comprise fluid conduits terminating with couplings fluidly connected with the high-pressure dirty fluid outlet ports (not numbered) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected along each port  536 . 
     The manifold segment  500  may also comprise a low-pressure dirty fluid conduit  542 , such as a fluid pipe, comprising opposing end openings or ports  544  and intermediate ports  546  located between the ports  544 . The conduit  542  may be or comprise a segment of the dirty fluid distribution conduit assembly  441 . The end ports  544  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding ports of low-pressure dirty fluid conduits of other manifold segments. The intermediate ports  546  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure dirty fluid inlet ports (not numbered) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected along each port  546 . 
     The manifold segment  500  may further comprise a frame assembly  550  extending around the conduits  512 ,  522 ,  532 ,  542 , the valves, the ports  516 ,  526 ,  530 ,  536 ,  546 , and/or the pressure exchangers  320  and operable to help maintain the components of the manifold segment  500  operatively connected and/or in relative positions. Portions of the frame assembly  550  are not shown to prevent obstructing some components of the manifold segment  500  from view. The frame assembly  550  may be a box-shaped frame (similar to frame  650  shown in  FIGS. 22 and 23 ), encompassing or surrounding the components of the manifold segment  500  on each side. The frame assembly  550  may be or comprise a plurality of interconnected structural steel members or beams extending about and connected with the components of the manifold segment  500 . The frame assembly  550  may be a load-bearing frame assembly operable to support the weight of one or more additional instances of the manifold segment  500  or other manifold segments vertically stacked on top of the manifold segment  500 . Thus, the frame assembly  550  may protect the components of the manifold segment  500  from physical damage during transport, assembly, and operations and help facilitate transportation of the manifold segment  500 . 
     The frame  550  may facilitate the manifold segment  500  to be implemented as a skid, which may be moved and/or temporarily or permanently installed at the wellsite surface  310 . The frame  550  may also permit the manifold segment  500  to be mounted on a trailer, such as may permit transportation to the wellsite surface  310 . For example, the frame assembly  550  and/or other portions of the manifold segment  500  may be constructed pursuant to International Organization for Standardization (ISO) specifications, permitting the manifold segment  500  to be transported like an intermodal ISO container. Accordingly, the frame assembly  550  or other portions of the manifold segment  500  may form or comprise corner castings  552 , such as may facilitate the manifold segment  500  to be detachably mounted on a transport surface, such as a trailer  710  (shown in  FIG. 24 ), and/or multiple manifold segments  500  to be stacked vertically on top of each other and/or connected together horizontally. The corner castings  552  and/or the frame assembly  550  may be constructed pursuant to ISO specifications, such as may permit the manifold segment  500  to be transported across different modes of transport within the global containerized intermodal freight transport system or other transport means adapted to receive standardized ISO containers. The frame assembly  550  may further have or form forklift or grappler pockets  554 , such as may permit the manifold segment  500  to be picked up and moved by a forklift, a grappler, and/or a crane equipped with grappler tongs. The frame assembly  500  may also support a catwalk (not shown), such as may support wellsite operators or other workers while inspecting the components of the manifold segment  500  and/or facilitating mounting of the manifold segments  500  together and/or on the trailer  710 . 
     The manifold segment  500  shows the pressure exchangers  320  mounted horizontally below the conduits  512 ,  522 . Horizontal mounting may result in the manifold segment  500  having a vertical height  556  that is substantially less than if the pressure exchangers  320  were mounted vertically. However, mounting the pressure exchangers  320  vertically may result in a manifold segment having a horizontal width  558  that is substantially less than when the pressure exchangers  320  are mounted horizontally, as in the manifold segment  500 . 
       FIGS. 22 and 23  are top and side views of an example implementation of a manifold segment  600  according to one or more aspects of the present disclosure. The manifold segment  600  comprises one or more similar features of the manifold segments  404 ,  500 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 16-23 , collectively. 
     The manifold segment  600  comprises four vertically mounted pressure exchangers  320 . Such vertical mounting may result in a horizontal width  658  that is substantially less than the horizontal width  558  of the manifold segment  500 , and a vertical height  656  that is substantially greater than the vertical height  556  of the manifold segment  500 . 
     The manifold segment  600  may comprise a low-pressure clean fluid conduit  612  comprising opposing end openings or ports  614  and intermediate ports  616  located between the ports  614 . The conduit  612  may be or comprise a segment of the clean fluid distribution conduit assembly  411 . The end ports  614  may be or comprise fluid couplings operable to detachably fluidly connect with corresponding ports of low-pressure clean fluid conduits of other manifold segments. Each intermediate port  616  may be or comprise a fluid conduit terminating with a coupling operable to fluidly connect with a corresponding fluid connector of the fluid conduit  305  to fluidly connect an inlet of a corresponding pump  306  with the clean fluid conduit  612 . A fluid valve (not numbered) may be connected at or along each port  616 . 
     The manifold segment  600  may further comprise a low-pressure clean fluid conduit  622  comprising opposing end openings or ports  624  and an intermediate ports  626  located between the ports  624 . The conduit  622  may be or comprise a segment of the clean fluid collection conduit assembly  421 . The end ports  624  may be or comprise fluid couplings operable to detachably fluidly connect with corresponding ports of low-pressure clean fluid conduits of other manifold segments. The intermediate ports  626  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure clean fluid outlet ports (not numbered) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected at or along each port  626 . Each pressure exchanger  320  may have the rotary actuator  335  operatively connected thereto. 
     The manifold segment  600  may further comprise ports  630  fluidly connected with the high-pressure clean fluid inlets (not numbered) of the pressure exchangers  320 . Each port  630  may be or comprise a fluid conduit terminating with a coupling operable to fluidly connect with a corresponding fluid connector of the fluid conduit  307  to fluidly connect an outlet of a pump  306  with the high-pressure clean fluid inlet of a corresponding pressure exchanger  320 . A fluid valve (not numbered) may be connected at or along each port  630 . 
     The manifold segment  600  may further comprise a high-pressure dirty fluid conduit  632  comprising opposing end openings or ports  634  and intermediate ports  636  located between the ports  634 . The conduit  632  may be or comprise a segment of the dirty fluid collection conduit assembly  431 . The end ports  634  may be or comprise fluid couplings operable to detachably fluidly connect with corresponding ports of high-pressure dirty fluid conduits of other manifold segments. The intermediate ports  636  may be or comprise fluid conduits terminating with couplings fluidly connected with the high-pressure dirty fluid outlet ports (not numbered) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected at or along each port  636 . 
     The manifold segment  600  may also comprise a low-pressure dirty fluid conduit  642  comprising opposing end openings or ports  644  and intermediate ports  646  located between the ports  644 . The conduit  642  may be or comprise a segment of the dirty fluid distribution conduit assembly  441 . The end ports  644  may be or comprise fluid couplings operable to detachably fluidly connect with corresponding ports of low-pressure dirty fluid conduits of other manifold segments. The intermediate ports  646  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure dirty fluid inlet ports (not numbered) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected at or along each port  646 . 
     Similarly to the manifold segment  500 , the manifold segment  600  may further comprise a frame assembly  650  extending around the conduits  612 ,  622 ,  632 ,  642 , the valves, the ports  616 ,  626 ,  630 ,  636 ,  646 , and/or the pressure exchangers  320  and operable to help maintain components of the manifold segment  600  operatively connected and/or in relative positions. The frame assembly  650  may protect the components of the manifold segment  600  from physical damage during transport, assembly, and operations and permit transportation of the manifold segment  600 . The frame  650  may facilitate the manifold segment  600  to be implemented as a skid, which may be moved and/or temporarily or permanently installed at the wellsite surface  310 . The frame assembly  650  or other portions of the manifold segment  600  may form or comprise corner castings  552 , such as may facilitate the manifold segment  600  to be detachably mounted on a transport surface, such as the trailer  710  (shown in  FIG. 24 ) and/or multiple manifold segments  600  to be stacked vertically on top of each and/or connected together horizontally. The frame assembly  650  may further have forklift or grappler pockets  554 , such as may permit the manifold segment  600  to be picked up and moved by a forklift, a grappler, and/or a crane equipped with grappler tongs. 
       FIG. 24  is a perspective view of an example implementation manifold assembly  700  according to one or more aspects of the present disclosure. The manifold assembly  700  comprises one or more similar features of the manifold segments  402 ,  404 ,  500 ,  600  including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 16-24 , collectively. 
     The manifold assembly  700  is shown comprising two manifold segments  702  having four pressure exchangers  320  and one manifold segment  704  having two pressure exchangers  320 . The manifold assembly  700  may be assembled and mounted on a mobile trailer  710 , such as may permit the manifold assembly  700  to be transported to a wellsite  310  via a vehicle (not shown), such as a truck. The mobile trailer  710  may be a flatbed trailer, a double-drop trailer, or another trailer adapted to receive and transport a manifold assembly or individual manifold segments. Accordingly, the manifold assembly  700  may be simultaneously assembled and mounted on the mobile trailer  710  or the manifold assembly  700  may be first assembled and then mounted on the mobile trailer  710  for transport to the wellsite  310 . Once at the wellsite  310 , the manifold assembly  700  may be unloaded from the mobile trailer  710  and fluidly connected to other wellsite equipment to conduct the pumping operations. However, the manifold assembly  700  may be maintained on the mobile trailer  710  throughout the pumping operations. The mobile trailer  710  may also be utilized to transport individual (i.e., unassembled) manifold segments  702 ,  704  or other manifold segments within the scope of the present disclosure to the wellsite  310 , where they may be unloaded and assembled to form the manifold assembly  700  or another manifold assembly. 
     Similar to as described above, each manifold segment  702 ,  704  may comprise a plurality of fluid conduit segments  712 ,  714  (some of which are obstructed from view) fluidly connected with corresponding pressure exchangers  320 . Each manifold segment  702 ,  704  may also include a frame assembly  722 ,  724  extending around the fluid conduit segments  712 ,  714  and the pressure exchangers  320 . The fluid conduit segments  712 ,  714  may be coupled at their corresponding end ports  716  to form fluid conduit assemblies  730  extending continuously along the length of the manifold assembly  700  fluidly connecting the manifold segments  702 ,  703 . The end ports  716  may be or comprise corresponding flanges, boss couplings, and threaded connectors, among other examples. The fluid conduits  730  may be or comprise the fluid conduit assemblies  382 ,  384 ,  386 ,  388 ,  411 ,  421 ,  431 ,  441  described above. The frame assemblies  702 ,  704  may also be connected together, such as via the corner castings  552 , to increase structural integrity of the manifold assembly  700  and/or to reduce stress between the end ports  716 . 
     The manifold assembly  700  may also comprise end segments  706 ,  708 , such as may be operable to fluidly connect multiple fluid conduits and/or pieces of wellsite equipment with a corresponding one or more of the fluid conduits  730 . For example, the end segment  706  may comprise a manifold  707  having a single inlet and a plurality of outlets and may be operable to split up flow of the pressurized dirty fluid among a plurality of fluid conduits for injection into the wellbore  311 . The end segment  708  may comprise a manifold  709  having a single outlet and a plurality of inlets and may be operable to combine flow of low pressure dirty fluid conducted along a plurality of fluid conduits from the mixer  304 . 
       FIG. 25  is a schematic view of an example implementation of another wellsite system  376  according to one or more aspects of the present disclosure. The wellsite system  376  comprises one or more similar features of the wellsite systems  370 ,  371 ,  372 ,  373 ,  374 ,  375  shown in  FIGS. 11, 12, 13, 14, 15, and 16 , respectively, including where indicated by like reference numbers, except as described below. 
     Unlike the wellsite systems,  370 ,  371 ,  372 ,  373 ,  374 ,  375 , the wellsite system  376  comprises a pressure exchanging manifold  360  fluidly connected to and operable to receive pressurized clean fluid from a manifold  308 . The manifold  308  may be fluidly connected with a plurality of pumps  306 , such as may be operable to pressurize the clean fluid received from the tanks  301  via the fluid conduit system  344  and discharge the pressurized clean fluid into the manifold  360  via the fluid conduit system  342 . The manifold  360  may comprise a plurality of pressure exchangers  320  that may be hard-piped or otherwise integrated with or along a plurality of fluid conduits operable to fluidly connect the pressure exchangers  320  with a source of pressurized clean fluid (i.e., the manifold  308 ), a source of dirty fluid (i.e., the mixer  304 ), and the wellbore  311 . 
     The manifold  360  may comprise a clean fluid distribution conduit  362  fluidly connected with the manifold  308  via the fluid conduit system  342  and configured to split up or otherwise distribute the pressurized clean fluid among the plurality of pressure exchangers  320 . The clean fluid distribution conduit  362  may include an inlet port  363  fluidly connected with the fluid conduit system  342  and a plurality of outlet ports (not numbered) each fluidly connected with a clean fluid inlet port  332  of a corresponding pressure exchanger  320 . The manifold  360  may further comprise a clean fluid collection conduit  364  fluidly connected with an inlet of the mixer  304  via a fluid conduit system  345 . The clean fluid collection conduit  364  may combine the streams of low-pressure clean fluid discharged from the pressure exchangers  320  into a single stream for transfer to the mixer  304  and/or another destination. The clean fluid collection conduit  364  may have a plurality of inlet ports (not numbered) each fluidly connected with the clean fluid outlet  334  of a corresponding pressure exchanger  320 . The clean fluid collection conduit  364  may also have an outlet port  365  fluidly connected with the fluid conduit system  345 . The manifold  360  may further comprise a dirty fluid distribution conduit  366  fluidly connected with an outlet of the mixer  304  via a fluid conduit system  346 . The dirty fluid distribution conduit  366  may split the stream of low-pressure dirty fluid discharged from the mixer  304  into multiple streams each conducted to a corresponding pressure exchanger  320 . The dirty fluid distribution conduit  366  may have an inlet port  367  fluidly connected with the fluid conduit system  346  and a plurality of outlet ports (not numbered) each fluidly connected with a dirty fluid inlet  331  of a corresponding pressure exchanger  320 . The manifold  360  may also comprise a dirty fluid collection conduit  368  fluidly connected with the wellbore  311  via a fluid conduit system  347 . The dirty fluid collection conduit  368  may combine the streams of high-pressure dirty fluid discharged from the pressure exchangers  320  into a single stream for transfer to the wellbore  311 . The dirty fluid collection conduit  368  may have a plurality of inlet ports (not numbered) each fluidly connected with the dirty fluid outlet  333  of a corresponding pressure exchanger  320  and an outlet port  369  fluidly connected with the fluid conduit system  347 . 
     Similarly as described above, the fluid conduit systems  344 ,  345  may be fluidly connected via a fluid conduit system  390  extending between the fluid conduit systems  344 ,  345 . The fluid conduit system  390  may permit a selected portion of the clean fluid discharged from the pressure exchangers  320  and flowing through the fluid conduit system  345  to be directed into the fluid conduit system  344  and fed into the pumps  306  via the clean fluid distribution conduit  362 . 
     Although the manifold  360  is shown as a single unit or piece of wellsite equipment, the manifold  360  may comprise a plurality of distinct units or sections detachably coupled together to form the manifold  360 .  FIGS. 26-28  are schematic views of an example implementation of manifold segments  802 ,  804  comprising a portion of or otherwise utilized to form a manifold assembly  800  according to one or more aspects of the present disclosure. The manifold assembly  800  and manifold segments  802 ,  804  comprise one or more similar features of the manifold  360 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 25-28 , collectively. 
     Referring now to  FIG. 26 , the manifold segment  802  may comprise a high-pressure clean fluid conduit  812 , such as a fluid pipe, comprising opposing end openings or ports  814  and intermediate ports  830  located between the ports  814 . The conduit  812  may be or comprise a segment of the clean fluid distribution conduit  362 . The end ports  814  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of high-pressure clean fluid conduits of other manifold segments. Each port  830  may be or comprise a fluid conduit terminating with a coupling fluidly connected with a high-pressure clean fluid inlet  332  of a corresponding pressure exchanger  320 . A fluid valve  819  may be connected at or along each port  830 . 
     The manifold segment  802  may further comprise a low-pressure clean fluid conduit  822 , such as a fluid pipe, comprising opposing end openings or ports  824  and an intermediate ports  826  located between the ports  824 . The conduit  822  may be or comprise a segment of the clean fluid collection conduit  364 . The end ports  824  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of low-pressure clean fluid conduits of other manifold segments. The ports  826  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure clean fluid outlet ports  334  of the pressure exchangers  320 . A fluid valve  828  may be connected at or along each port  826 . 
     The manifold segment  802  may further comprise a high-pressure dirty fluid conduit  832 , such as a fluid pipe, comprising opposing end openings or ports  834  and intermediate ports  836  located between the ports  834 . The conduit  832  may be or comprise a segment of the dirty fluid collection conduit  368 . The end ports  834  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of high-pressure dirty fluid conduits of other manifold segments. The intermediate ports  836  may be or comprise fluid conduits terminating with couplings fluidly connected with the high-pressure dirty fluid outlet ports  333  of the pressure exchangers  320 . A fluid valve  838  may be connected at or along each port  836 . 
     The manifold segment  802  may also comprise a low-pressure dirty fluid conduit  842 , such as a fluid pipe, comprising opposing end openings or ports  844  and intermediate ports  846  located between the ports  844 . The conduit  842  may be or comprise a segment of the dirty fluid distribution conduit  366 . The end ports  844  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of low-pressure dirty fluid conduits of other manifold segments. The intermediate ports  846  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure dirty fluid inlet ports  331  of the pressure exchangers  320 . A fluid valve  848  may be connected at or along each port  846 . 
     Each pressure exchanger  320  may have a rotary actuator  335  operatively connected thereto. The rotary actuator  335  may be connected with a rotor (not shown) of the pressure exchanger  320 , such as may impart rotation to the rotor. The rotary actuator  335  may be an electrical or fluid powered motor connected with the rotor via a shaft, a transmission, or another intermediate driving member (not shown) operable to transfer torque from the rotary actuator  335  to the rotor. 
     The fluid valves  819  may be or comprise fluid shut-off valves, such as ball valves, globe valves, butterfly valves, and/or other types of fluid valves, which may be selectively opened and closed to permit and prevent fluid flow through the ports  830 . Each fluid valve  819  may be actuated manually, such as by a lever (not shown). However, each fluid valve  819  may be actuated remotely by a corresponding actuator (not shown), such as an electric actuator, such as a solenoid or motor, or a fluid actuator, such as pneumatic or hydraulic cylinder or rotary actuator. The fluid valves  828 ,  838 ,  848  may be or comprise fluid shut-off valves, such as ball valves, globe valves, butterfly valves, and/or other types of fluid valves, which may be selectively opened and closed to permit and prevent fluid flow. The fluid valves  828 ,  838 ,  848  may instead be or comprise flow rate control valves, such as needle valves, metering valves, butterfly valves, globe valves, or other valves operable to progressively or gradually open and close to control the fluid flow rate. Each fluid valve  828 ,  838 ,  848  may be actuated remotely by a corresponding actuator (not numbered) operatively coupled with the fluid valves  828 ,  838 ,  848 . The actuators may be or comprise electric actuators, such as solenoids or motors, or fluid actuators, such as pneumatic or hydraulic cylinders or rotary actuators. The fluid valves  828 ,  838 ,  848  may also be actuated manually, such as by a lever (not shown). 
     Although the manifold segment  802  is shown comprising two pressure exchangers  320  and two sets of corresponding ports  826 ,  830 ,  836 ,  846 , manifold segments within the scope of the present disclosure may also comprise one, three, four, five, six, eight, or more pressure exchangers  320  and corresponding sets of ports  826 ,  830 ,  836 ,  846 .  FIG. 27  is a schematic view of an example implementation of a manifold segment  804  comprising four pressure exchangers  320  and four sets of corresponding ports  826 ,  830 ,  836 ,  846 . The manifold segment  804  comprises one or more similar features of the manifold segment  802 , including where indicated by like reference numbers, except as described below. 
     The manifold segment  804  may comprise a high-pressure clean fluid conduit  862 , such as a fluid pipe, comprising opposing end openings or ports  814  and intermediate ports  830  located between the ports  814 . The conduit  862  may be or comprise a segment of the clean fluid distribution conduit  362 . Each port  830  may be fluidly connected with the high-pressure clean fluid inlet  332  of a corresponding pressure exchanger  320 . The manifold segment  804  may further comprise a low-pressure clean fluid conduit  872  comprising opposing end openings or ports  824  and intermediate ports  826  located between the ports  824 . The conduit  872  may be or comprise a segment of the clean fluid collection conduit  364 . Each port  826  may be fluidly connected with the low-pressure clean fluid outlet  334  of a corresponding pressure exchanger  320 . The manifold segment  804  may further comprise a high-pressure dirty fluid conduit  882  comprising opposing end openings or ports  834  and intermediate ports  836  located between the ports  834 . The conduit  882  may be or comprise a segment of the dirty fluid collection conduit  368 . Each port  836  may be fluidly connected with the high-pressure dirty fluid outlet  333  of a corresponding pressure exchanger  320 . The manifold segment  802  may also comprise a low-pressure dirty fluid conduit  892  comprising opposing end openings or ports  844  and intermediate ports  846  located between the ports  844 . The conduit  892  may be or comprise a segment of the dirty fluid distribution conduit  366 . Each port  846  may be fluidly connected with the low-pressure dirty fluid inlet  331  of a corresponding pressure exchanger  320 . Similar as described above, each pressure exchanger  320  may have a rotary actuator  335  operatively connected thereto. The rotary actuator  335  may be connected with a rotor (not shown) of the pressure exchanger  320 , such as may impart rotation to the rotor. 
     Each manifold segment  802 ,  804  may further comprise a multi-conductor cable (shown in  FIGS. 26 and 27  as dashed lines), hereinafter referred to as a conductor  806 ,  808 , extending between opposing ends or sides of a corresponding manifold segment  802 ,  804 . The conductors  806 ,  808  may be operable to communicatively and electrically connect the manifold segments  802 ,  804  with adjacent manifold segments  802 ,  804  when coupled together to form the manifold assembly  800 . Each conductor  806 ,  808  may include various electrical connectors or interfaces (not shown), such as may facilitate connection between the conductor  806 ,  808  and the various components of the manifold segment  802 ,  804  to permit signal and electrical power communication between the various components of the manifold segments  802 ,  804  and a source of control signals and electrical power, such as the control unit  312  and an electrical generator (not shown). For example, actuators of the valves  828 ,  838 ,  848  and the motors  335  of each manifold segment  802 ,  804  may be communicatively connected with each conductor  806 ,  808  via corresponding conductors (also shown as dashed lines), such as may permit transfer of electrical power, data, and/or control signals between, e.g., the control unit  312  and electrical generator and one or more of the valves  828 ,  838 ,  848  and motors  335 . Opposing ends of each conductor  806 ,  808  may terminate with or otherwise comprise electrical connectors or interfaces  807 , which may facilitate mechanical and electrical connection between conductors  806 ,  808  of adjacent manifold segments  802 ,  804  when coupled to form the manifold assembly  800 . 
     Two or more of the manifold segments  802 ,  804 , or other manifold segments comprising a different number of pressure exchangers  320 , may be coupled together to form a manifold assembly within the scope of the present disclosure.  FIG. 28  is a schematic view of an example implementation of the manifold assembly  800  comprising two manifold segments  802  and one manifold segment  804 . Thus, the manifold assembly  800  comprises one or more similar features of the manifold segments  802 ,  804 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 25-28 , collectively. 
     The manifold segments  802 ,  804  may be coupled together to form the manifold assembly  800  by detachably coupling corresponding end ports  814 ,  824 ,  834 ,  844  of each manifold segment  802 ,  804 . For example, the high-pressure clean fluid conduits  812 ,  862  of the manifold segments  802 ,  804  may be detachably coupled at their corresponding end ports  814  to form a high-pressure clean fluid conduit assembly  811  extending continuously along the length of the manifold assembly  800 . One of the end ports  814  at the end of the conduit assembly  811  may be fluidly isolated or closed by a closing member  813 , such as a plug, a cap, a blind flange, and the like. The end port  814  at the opposing end of the conduit assembly  811  may be fluidly connected with the conduit  342 , such as to supply high-pressure clean fluid to the pressure exchangers  320 . Furthermore, the low-pressure clean fluid conduits  822 ,  872  of the manifold segments  802 ,  804  may be coupled at their corresponding end ports  824  to form a low-pressure clean fluid conduit assembly  821  extending continuously along the length of the manifold assembly  800 . One of the end ports  824  at the end of the conduit assembly  821  may be fluidly isolated or closed by a closing member  823 . The end port  824  at the opposing end of the conduit assembly  821  may be fluidly connected with the conduit  345  to transfer the low-pressure clean fluid discharged by the pressure exchangers  320  to the mixer  304  and/or the manifold  308 . The low-pressure clean fluid conduits  832 ,  882  of the manifold segments  802 ,  804  may be coupled at their corresponding end ports  834  to form a high-pressure dirty fluid conduit assembly  831  extending continuously along the length of the manifold assembly  800 . One of the end ports  834  at the end of the conduit assembly  831  may be fluidly isolated or closed by a closing member  833 . The end port  834  at the opposing end of the conduit assembly  831  may be fluidly connected with the conduit  347  to transfer the high-pressure dirty fluid discharged by the pressure exchangers  320  for injection into the wellbore  311 . Also, the low-pressure clean fluid conduits  842 ,  892  of the manifold segments  802 ,  804  may be coupled at their corresponding end ports  844  to form a low-pressure dirty fluid conduit assembly  841  extending continuously along the length of the manifold assembly  800 . One of the end ports  844  at the end of the conduit assembly  841  may be fluidly isolated or closed by a closing member  843 . The end port  844  at the opposing end of the conduit assembly  841  may be fluidly connected with the conduit  346 , such as to supply low-pressure dirty fluid to the pressure exchangers  320 . 
     The manifold segments  802 ,  804  may be communicatively and electrically connected by coupling corresponding conductors  806 ,  808  of adjacent manifold segments  802 ,  804 . For example, the conductors  806 ,  808  of the manifold segments  802 ,  804  may be detachably coupled at their corresponding end connectors  807  to form a conductor assembly  809  extending continuously along the length of the manifold assembly  800 . The conductor assembly  809  may facilitate transfer of electrical power, data, and/or control signals between, e.g., the control unit  312  and the electrical generator and one or more of the manifold segments  802 ,  804  of the manifold assembly  800 . The conductor assembly  809  may be electrically connected with a conductor  405 , which may be electrically connected with the control unit  312  and the electrical generator to electrically connect the manifold assembly  800  with the control unit  312  and the electrical generator. 
     Although the manifold assembly  800  is shown comprising two manifold segments  802  and one manifold segment  804 , manifold assemblies within the scope of the present disclosure may comprise other quantities of manifold segments  802 ,  804  and in different combinations. For example, a manifold assembly within the scope of the present disclosure may include one or more manifold segments comprising one, two, three, four, five, six, eight, or other quantities of pressure exchangers  320 . 
       FIGS. 29 and 30  are perspective and top views of an example implementation of a manifold segment  900  according to one or more aspects of the present disclosure. The manifold segment  900  comprises one or more similar features of the manifold  360  and manifold segments  802 ,  804 , including where indicated by like reference numbers, except as described below. The following description refers to  FIGS. 25-30 , collectively. 
     The manifold segment  900  may comprise one or more low-pressure clean fluid conduits  912 , such as fluid pipes, comprising opposing end openings or ports  914  and intermediate ports  916  located between the ports  914 . The conduit  912  may be or comprise a segment of the clean fluid collection conduit assembly  364 ,  821 . The end ports  914  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of low-pressure clean fluid conduits of other manifold segments. Each intermediate port  916  may be or comprise a fluid conduit fluidly connected with a clean fluid outlet (obstructed from view) of a corresponding pressure exchanger  320 . Each pressure exchanger  320  may have the rotary actuator  335  operatively connected thereto. A fluid valve (not numbered) may be connected at or along each intermediate port  916 . 
     The manifold segment  900  may further comprise one or more high-pressure clean fluid conduits  922 , such as a fluid pipes, comprising opposing end openings or ports  924  and an intermediate ports (obstructed from view) located between the ports  924 . The conduits  922  may be or comprise a segment of the clean fluid distribution conduit assembly  362 ,  811 . The end ports  924  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of high-pressure clean fluid conduits of other manifold segments. The intermediate ports may be or comprise fluid conduits terminating with couplings fluidly connected with the high-pressure clean fluid inlets (obstructed from view) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected along each port extending between the conduits  922  and a corresponding pressure exchanger  320 . 
     The manifold segment  900  may further comprise one or more high-pressure dirty fluid conduits  932 , such as fluid pipes, each comprising opposing end openings or ports  934  and intermediate ports (obstructed from view) located between the ports  934 . The conduits  932  may be or comprise a segment of the dirty fluid collection conduit assembly  368 ,  831 . The end ports  934  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of high-pressure dirty fluid conduits of other manifold segments. The intermediate ports may be or comprise fluid conduits terminating with couplings fluidly connected with the high-pressure dirty fluid outlet ports (obstructed from view) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected along each port extending between the conduits  932  and a corresponding pressure exchanger  320 . 
     The manifold segment  900  may also comprise one or more low-pressure dirty fluid conduits  942 , such as fluid pipes, comprising opposing end openings or ports  944  and intermediate ports  946  located between the ports  944 . The conduits  942  may be or comprise a segment of the dirty fluid distribution conduit assembly  366 ,  841 . The end ports  944  may be or comprise fluid couplings, such as flanges, boss couplings, threaded connectors, among other examples, operable to detachably fluidly connect with corresponding end ports of low-pressure dirty fluid conduits of other manifold segments. The intermediate ports  946  may be or comprise fluid conduits terminating with couplings fluidly connected with the low-pressure dirty fluid inlet ports (obstructed from view) of the pressure exchangers  320 . A fluid valve (not numbered) may be connected along each port  946 . 
     Although not shown, the manifold segment  900  may further comprise a frame assembly extending around the conduits  912 ,  922 ,  932 ,  942 , the valves, the ports, and/or the pressure exchangers  320  and operable to help maintain the components of the manifold segment  900  operatively connected and/or in relative positions. Such frame assembly may comprise one or more similar features of the frame assemblies  550 ,  650  described above and shown in  FIGS. 20-23 . Furthermore, similarly to the manifold segments  702 ,  704 , the manifold segment  900  may be detachably coupled with other manifold segments to form a manifold assembly and mounted on a mobile trailer (such as the trailer  710  shown in  FIG. 24 ), such as may permit the manifold assembly to be transported to a wellsite via a vehicle. 
     A manifold assembly within the scope of the present disclosure, such as the manifold assembly  360 ,  380 ,  400 ,  700 ,  800 , may be customized at a wellsite and/or at an operational base, such that the resulting manifold assembly may be suited or optimized for flow rates, pressures, and proppant loading that is intended or otherwise expected at a well pad. For example, a manifold assembly may be customized for flow rate by connecting a number of manifold segments to include a sufficient number of pressure exchangers collectively operable to generate the intended or expected dirty fluid (i.e., slurry) flow rates. A manifold assembly may be customized for pressure, for example, by connecting manifold segments comprising pressure exchangers rated for intended or expected operating pressures. A manifold assembly may be customized for proppant loading, for example, by utilizing manifold segments comprising pressure exchangers designed for intended or expected proppant loading (e.g., high, medium, low proppant loading). Customization for proppant loading may also be achieved by adjusting the number of pressure exchangers with respect to lead flow (i.e., high pressure fluid flowing directly from high pressure inlets to high pressure outlets) and feed slurry density. A given downhole proppant loading may be generated with multiple combinations of feed slurry proppant loading and lead flow. Increasing lead flow may decrease downhole fluid density if the supplied dirty fluid density is held constant. 
     Various portions of the wellsite systems  371 - 376  described above may collectively form and/or be controlled by a control system, such as may be operable to monitor and/or control operations of the wellsite systems  371 - 376 .  FIG. 31  is a schematic view of at least a portion of an example implementation of such a control system  1000  according to one or more aspects of the present disclosure. The following description refers to one or more of  FIGS. 1-31 . 
     The control system  1000  may comprise a  1010 , which may be in communication with the gel maker  302 , the solids container  303 , the mixer  304 , the pumps  306 ,  398 , the valves  391 ,  393 , the flow rate sensors  395 ,  396 ,  397 , the fluid analyzers  348 ,  349 , and the motors  335  and valves  428 ,  438 ,  448 ,  828 ,  838 ,  848  of the manifold assemblies  400 ,  700 ,  800  and/or actuators associated with one or more of these components. For clarity, these and other components in communication with the controller  1010  will be collectively referred to hereinafter as “sensor and controlled equipment.” The controller  1010  may be operable to receive coded instructions  1032  from wellsite operators and signals generated by the sensor equipment, process the coded instructions  1032  and the signals, and communicate control signals to the controlled equipment to execute the coded instructions  1032  to implement at least a portion of one or more example methods and/or processes described herein, and/or to implement at least a portion of one or more of the example systems described herein. The controller  1010  may be or form a portion of the control unit  312 . 
     The controller  1010  may be or comprise, for example, one or more processors, special-purpose computing devices, servers, personal computers (e.g., desktop, laptop, and/or tablet computers) personal digital assistant (PDA) devices, smartphones, internet appliances, and/or other types of computing devices. The controller  1010  may comprise a processor  1012 , such as a general-purpose programmable processor. The processor  1012  may comprise a local memory  1014 , and may execute coded instructions  1032  present in the local memory  1014  and/or another memory device. The processor  1012  may execute, among other things, the machine-readable coded instructions  1032  and/or other instructions and/or programs to implement the example methods and/or processes described herein. The programs stored in the local memory  1014  may include program instructions or computer program code that, when executed by an associated processor, facilitate the wellsite system  371 - 376  to perform the example methods and/or processes described herein. The processor  1012  may be, comprise, or be implemented by one or more processors of various types suitable to the local application environment, and may include one or more of general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as non-limiting examples. Of course, other processors from other families are also appropriate. 
     The processor  1012  may be in communication with a main memory  1017 , such as may include a volatile memory  1018  and a non-volatile memory  1020 , perhaps via a bus  1022  and/or other communication means. The volatile memory  1018  may be, comprise, or be implemented by random access memory (RAM), static random access memory (SRAM), synchronous dynamic random access memory (SDRAM), dynamic random access memory (DRAM), RAMBUS dynamic random access memory (RDRAM), and/or other types of random access memory devices. The non-volatile memory  1020  may be, comprise, or be implemented by read-only memory, flash memory, and/or other types of memory devices. One or more memory controllers (not shown) may control access to the volatile memory  1018  and/or non-volatile memory  1020 . 
     The controller  1010  may also comprise an interface circuit  1024 . The interface circuit  1024  may be, comprise, or be implemented by various types of standard interfaces, such as an Ethernet interface, a universal serial bus (USB), a third generation input/output (3GIO) interface, a wireless interface, a cellular interface, and/or a satellite interface, among others. The interface circuit  1024  may also comprise a graphics driver card. The interface circuit  1024  may also comprise a communication device, such as a modem or network interface card to facilitate exchange of data with external computing devices via a network (e.g., Ethernet connection, digital subscriber line (DSL), telephone line, coaxial cable, cellular telephone system, satellite, etc.). One or more of the controlled equipment may be connected with the controller  1010  via the interface circuit  1024 , such as may facilitate communication between the controlled equipment and the controller  1010 . 
     One or more input devices  1026  may also be connected to the interface circuit  1024 . The input devices  1026  may permit the wellsite operators to enter the coded instructions  1032 , including control commands, operational set-points, and/or other data for use by the processor  1012 . The operational set-points may include, as non-limiting examples, intended frequencies or speeds of the pressure exchangers  320  to produce intended flows of dirty fluid for injection into the wellbore  311 . The input devices  1026  may be, comprise, or be implemented by a keyboard, a mouse, a touchscreen, a track-pad, a trackball, an isopoint, and/or a voice recognition system, among other examples. 
     One or more output devices  1028  may also be connected to the interface circuit  1024 . The output devices  1028  may be, comprise, or be implemented by display devices (e.g., a liquid crystal display (LCD), a light-emitting diode (LED) display, or cathode ray tube (CRT) display), printers, and/or speakers, among other examples. The controller  1010  may also communicate with one or more mass storage devices  1030  and/or a removable storage medium  1034 , such as may be or include floppy disk drives, hard drive disks, compact disk (CD) drives, digital versatile disk (DVD) drives, and/or USB and/or other flash drives, among other examples. 
     The coded instructions  1032  may be stored in the mass storage device  1030 , the main memory  1017 , the local memory  1014 , and/or the removable storage medium  1034 . Thus, the controller  1010  may be implemented in accordance with hardware (perhaps implemented in one or more chips including an integrated circuit, such as an ASIC), or may be implemented as software or firmware for execution by the processor  1012 . In the case of firmware or software, the implementation may be provided as a computer program product including a non-transitory, computer-readable medium or storage structure embodying computer program code (i.e., software or firmware) thereon for execution by the processor  1012 . The coded instructions  1032  may include program instructions or computer program code that, when executed by the processor  1012 , may cause the wellsite systems  371 - 376  to perform intended methods, processes, and/or routines. 
     The controller  1010  may further comprise one or more variable frequency drives (VFD)  1036 , which may facilitate speed control of the motors  335  and, thus, control the rotational speed of the pressure exchanger rotors. The VFDs  1036  may receive control signals from the processor  1012  via the bus  1022  or the output device  1028  and output corresponding electrical power to control the speed and the torque output of the motors  335  to control the flow rate of the dirty fluid for injection into the wellbore  311 . In other implementations of the control system  1000 , the one or more VFDs may be disposed adjacent to or in association with each manifold segment  402 ,  404 ,  500 ,  600 ,  802 ,  804 ,  900 . 
       FIG. 32  is a flow-chart diagram of at least a portion of an example implementation of a method ( 900 ) according to one or more aspects of the present disclosure. The method ( 900 ) may be performed utilizing or otherwise in conjunction with at least a portion of one or more implementations of one or more instances of the apparatus shown in one or more of  FIGS. 1-31  and/or otherwise within the scope of the present disclosure. The method ( 900 ) may be performed manually by the wellsite operator and/or performed or caused, at least partially, by the controller  1010  executing the coded instructions  1032  according to one or more aspects of the present disclosure. Thus, the following description of the method ( 900 ) also refers to apparatus shown in one or more of  FIGS. 1-31 . However, the method ( 900 ) may also be performed in conjunction with implementations of apparatus other than those depicted in  FIGS. 1-31  that are also within the scope of the present disclosure. 
     The method ( 900 ) may comprise coupling ( 905 ) a plurality of fluid manifold segments  402 ,  404  together to form a fluid manifold assembly  400 . Each fluid manifold segment  402 ,  404  may comprise a plurality of pressure exchangers  320  each comprising a clean fluid inlet  332 , a clean fluid outlet  334 , a dirty fluid inlet  331 , and a dirty fluid outlet  333 . Each fluid manifold segment  402 ,  404  may further comprise a first fluid conduit  412  having opposing end ports  414  and intermediate ports  416 , a second fluid conduit  422  having opposing end ports  424  and intermediate ports  426  each fluidly connected with the clean fluid outlet  334  of a corresponding pressure exchanger  320 , a third fluid conduit  442  having opposing end ports  444  and intermediate ports  446  each fluidly connected with the dirty fluid inlet  331  of a corresponding pressure exchanger  320 , and a fourth fluid conduit  432  comprising opposing end ports  434  and intermediate ports  436  each fluidly connected with the dirty fluid outlet  333  of a corresponding pressure exchanger  320 . The method ( 900 ) may further comprise fluidly connecting ( 910 ) the fluid manifold assembly  400  with clean fluid pumps  306 , fluidly connecting ( 915 ) the fluid manifold assembly  400  with a source of a dirty fluid  304 , and fluidly connecting ( 920 ) the fluid manifold assembly  400  with a wellbore  311  located at an oil and gas wellsite  310 . 
     Coupling ( 905 ) the plurality of fluid manifold segments  402 ,  404  together to form the fluid manifold assembly  400  may comprise ( 925 ) coupling the opposing end ports  414  of the first fluid conduits  412  of the plurality of fluid manifold segments  402 ,  404  to form a first fluid conduit assembly  411  of the fluid manifold assembly  400 , coupling the opposing end ports  424  of the second fluid conduits  422  of the plurality of fluid manifold segments  402 ,  404  to form a second fluid conduit assembly  421  of the fluid manifold assembly  400 , coupling the opposing end ports  444  of the third fluid conduits  442  of the plurality of fluid manifold segments  402 ,  404  to form a third fluid conduit assembly  441  of the fluid manifold assembly  400 , and coupling the opposing end ports  434  of the fourth fluid conduits  432  of the plurality of fluid manifold segments  402 ,  404  to form a fourth fluid conduit assembly  431  of the fluid manifold assembly  400 . 
     Fluidly connecting ( 910 ) the fluid manifold assembly  400  with the clean fluid pumps  306  may comprise fluidly connecting ( 930 ) intermediate ports  416  of the first fluid conduit assembly  411  with inlets of corresponding clean fluid pumps  306  and may also comprise fluidly connecting ( 935 ) the clean fluid inlets  332  of the plurality of pressure exchangers  320  with outlets of corresponding clean fluid pumps  306 . However, wherein each intermediate port  830  of the first fluid conduit  812  is fluidly connected with the clean fluid inlet  332  of a corresponding pressure exchanger  320 , fluidly connecting ( 910 ) the fluid manifold assembly  800  with the clean fluid pumps  306  may comprise fluidly connecting ( 937 ) at least one of the opposing end ports  814  of the first fluid conduit assembly  811  with outlets of the clean fluid pumps  306 . 
     Fluidly connecting ( 915 ) the fluid manifold assembly  400  with the source of the dirty fluid  304  may comprise fluidly connecting ( 940 ) the third fluid conduit assembly  441  with an outlet of the source of the dirty fluid  304  and may also comprise fluidly connecting ( 945 ) the second fluid conduit assembly  421  with an inlet of the source of the dirty fluid  304 . The source of the dirty fluid  304  may be or comprise a mixer  304  operable to produce the dirty fluid. The dirty fluid may comprise an oil and gas well treatment fluid. 
     Furthermore, fluidly connecting ( 920 ) the fluid manifold assembly  400  with the wellbore  311  may comprise fluidly connecting ( 950 ) the fourth fluid conduit assembly  431  with the wellbore  311 . 
     Each of the plurality of pressure exchangers  320  may comprise a rotor  201 , wherein at least one chamber  150  extends through the rotor  201 . Thus, the method ( 900 ) may further comprise operating ( 955 ) each of the plurality of pressure exchangers  320  to receive the dirty fluid at a first pressure into the at least one chamber  150  via the dirty fluid inlet  331 , receive clean fluid at a second pressure into the at least one chamber  150  via the clean fluid inlet  332  to pressurize the dirty fluid to a third pressure, wherein the second and third pressures may be substantially greater than the first pressure, discharge the dirty fluid at the third pressure from the at least one chamber  150  via the dirty fluid outlet  333 , and discharge the clean fluid at a fourth pressure from the at least one chamber  150  via the clean fluid outlet  331 . 
     The method ( 900 ) may also comprise, before coupling ( 905 ) the plurality of fluid manifold segments  402 ,  404  together, transporting ( 960 ) each of the plurality of fluid manifold segments  402 ,  404  to the oil and gas wellsite  310 . 
     In view of the entirety of the present disclosure, including the figures and the claims, a person having ordinary skill in the art will readily recognize that the present disclosure introduces an apparatus that includes a manifold assembly comprising: (A) a plurality of pressure exchangers each comprising: (i) a clean fluid inlet; (ii) a clean fluid outlet; (iii) a dirty fluid inlet; and (iv) a dirty fluid outlet; (B) a first clean fluid conduit comprising: (i) an inlet; and (ii) a plurality of outlets; (C) a second clean fluid conduit comprising: (i) a plurality of inlets each in detachable fluid connection with the clean fluid outlet of a corresponding one of the pressure exchangers; and (ii) an outlet; (D) a first dirty fluid conduit comprising: (i) an inlet; and (ii) a plurality of outlets each in detachable fluid connection with the dirty fluid inlet of a corresponding one of the pressure exchangers; and (E) a second dirty fluid conduit comprising: (i) a plurality of inlets each in detachable fluid connection with the dirty fluid outlet of a corresponding one of the pressure exchangers; and (ii) an outlet. 
     Each pressure exchanger may comprise a rotor, at least one chamber extends through the rotor, and each pressure exchanger may be operable to: receive dirty fluid at a first pressure into the at least one chamber via the dirty fluid inlet; receive clean fluid at a second pressure into the at least one chamber via the clean fluid inlet to pressurize the dirty fluid to a third pressure, wherein the second and third pressures may be substantially greater than the first pressure; discharge the dirty fluid at the third pressure from the at least one chamber via the dirty fluid outlet; and discharge the clean fluid at a fourth pressure from the at least one chamber via the clean fluid outlet. 
     The apparatus may comprise a plurality of high-pressure pumps and a source of clean fluid, where each outlet of the first clean fluid conduit may be in detachable fluid connection with a fluid inlet of a corresponding one of the plurality of high-pressure pumps, and the inlet of the first clean fluid conduit may be in detachable fluid connection with the source of clean fluid. In such implementations, among others within the scope of the present disclosure, each clean fluid inlet of the pressure exchangers may be in detachable fluid connection with a fluid outlet of a corresponding one of the high-pressure pumps. 
     The apparatus may comprise a plurality of high-pressure pumps, where each outlet of the first clean fluid conduit may be fluidly connected with the clean fluid inlet of a corresponding pressure exchanger, and the first clean fluid conduit may be operable to receive pressurized clean fluid from the high-pressure pumps via the inlet of the first clean fluid conduit. 
     The apparatus may comprise a mixer operable to produce a dirty fluid, and the outlet of the second clean fluid conduit may be in detachable fluid connection with an inlet of the mixer. 
     The apparatus may comprise a mixer operable to produce a dirty fluid, and the inlet of the first dirty fluid conduit may be in detachable fluid connection with an outlet of the mixer. In such implementations, among others within the scope of the present disclosure, the dirty fluid may comprise treatment fluid for an oil and/or gas well. 
     The outlet of the second dirty fluid conduit may be in detachable fluid connection with a wellbore. 
     The manifold assembly may comprise a plurality of manifold segments mounted on a mobile trailer, and each of ones of the manifold segments may comprise: at least one of the pressure exchangers; the first clean fluid conduit; the second clean fluid conduit; the first dirty fluid conduit; and the second dirty fluid conduit. 
     The manifold assembly may comprise a plurality of manifold segments mounted on a mobile trailer, and each of ones of the manifold segments may comprise: at least one of the pressure exchangers; a segment of the first clean fluid conduit; a segment of the second clean fluid conduit fluidly connected with the clean fluid outlet of the at least one of the pressure exchangers; a segment of the first dirty fluid conduit fluidly connected with the dirty fluid inlet of the at least one of the pressure exchangers; and a segment of the second dirty fluid conduit fluidly connected with the dirty fluid outlet of the at least one of the pressure exchangers. The segments of the first clean fluid conduit of the ones of the manifold segments may be detachably coupled to collectively form the first clean fluid conduit, the segments of the second clean fluid conduit of the ones of the manifold segments may be detachably coupled to collectively form the second clean fluid conduit, the segments of the first dirty fluid conduit of the ones of the manifold segments may be detachably coupled to collectively form the first dirty fluid conduit, and the segments of the second dirty fluid conduit of the ones of the manifold segments may be detachably coupled to collectively form the second dirty fluid conduit. At least one of the ones of the manifold segments may comprise two, four, or six of the pressure exchangers. Each of the ones of the manifold segments may further comprise a valve fluidly connected to one or more of the clean fluid inlet, the clean fluid outlet, the dirty fluid inlet, and the dirty fluid outlet of the at least one of the pressure exchangers. 
     The present disclosure also introduces an apparatus comprising a fluid manifold segment operable for detachably coupling with another instance of the fluid manifold segment to form a fluid manifold assembly, wherein the fluid manifold segment comprises: a plurality of pressure exchangers each comprising a clean fluid inlet, a clean fluid outlet, a dirty fluid inlet, and a dirty fluid outlet; a first fluid conduit comprising opposing end ports and intermediate ports; a second fluid conduit comprising opposing end ports and intermediate ports each fluidly connected with the clean fluid outlet of a corresponding pressure exchanger; a third fluid conduit comprising opposing end ports and intermediate ports each fluidly connected with the dirty fluid inlet of a corresponding pressure exchanger; and a fourth fluid conduit comprising opposing end ports and intermediate ports each fluidly connected with the dirty fluid outlet of a corresponding pressure exchanger. Each pressure exchanger may comprise a rotor, at least one chamber may extend through the rotor, and each pressure exchanger may be operable to: receive dirty fluid at a first pressure into the at least one chamber via the dirty fluid inlet; receive clean fluid at a second pressure into the at least one chamber via the clean fluid inlet to pressurize the dirty fluid to a third pressure, wherein the second and third pressures may be substantially greater than the first pressure; discharge the dirty fluid at the third pressure from the at least one chamber via the dirty fluid outlet; and discharge the clean fluid at a fourth pressure from the at least one chamber via the clean fluid outlet. In such implementations, among others within the scope of the present disclosure, each fluid manifold segment may comprise a plurality of electric motors each operatively connected with and operable to rotate the rotor of a corresponding one of the pressure exchangers. 
     At least one of the opposing end ports of the first fluid conduit of the fluid manifold segment may be operable for detachably coupling with an end port of a first fluid conduit of the another instance of the fluid manifold segment to form a first fluid conduit assembly of the fluid manifold assembly; at least one of the opposing end ports of the second fluid conduit of the fluid manifold segment may be operable for detachably coupling with an end port of a second fluid conduit of the another instance of the fluid manifold segment to form a second fluid conduit assembly of the fluid manifold assembly; at least one of the opposing end ports of the third fluid conduit of the fluid manifold segment may be operable for detachably coupling with an end port of a third fluid conduit of the another instance of the fluid manifold segment to form a third fluid conduit assembly of the fluid manifold assembly; and at least one of the opposing end ports of the fourth fluid conduit of the fluid manifold segment may be operable for detachably coupling with an end port of a fourth fluid conduit of the another instance of the fluid manifold segment to form a fourth fluid conduit assembly of the fluid manifold assembly. In such implementations, among others within the scope of the present disclosure, each intermediate port of the first fluid conduit may be operable to fluidly connect with a fluid inlet of a corresponding high-pressure pump, and the first fluid conduit assembly may be operable to receive clean fluid from a source of clean fluid via at least one of the opposing end ports. Each clean fluid inlet of the pressure exchangers may be operable to fluidly connect with a fluid outlet of a corresponding high-pressure pump. Each intermediate port of the first fluid conduit may be fluidly connected with the clean fluid inlet of a corresponding pressure exchanger, and the first fluid conduit assembly may be operable to receive pressurized clean fluid via at least one of the opposing end ports. An end port of the second fluid conduit assembly may be operable to fluidly connect with an inlet of a mixer operable to produce a dirty fluid. An end port of the third fluid conduit assembly may be operable to fluidly connect with an outlet of a mixer operable to produce a dirty fluid. The dirty fluid may comprise treatment fluid for an oil and/or gas well. An end port of the fourth fluid conduit assembly may be operable to fluidly connect with a wellbore. 
     The fluid manifold segment may be mounted on a mobile trailer. 
     The fluid manifold segment may comprise two, four, or six pressure exchangers. 
     The manifold segment may further comprise a plurality of valves each fluidly connected at one or more of the clean fluid inlet, the clean fluid outlet, the dirty fluid inlet, and the dirty fluid outlet of a corresponding one of the pressure exchangers. 
     The present disclosure also introduces a method comprising: (A) coupling a plurality of fluid manifold segments together to form a fluid manifold assembly, wherein each fluid manifold segment comprises: (i) a plurality of pressure exchangers each comprising a clean fluid inlet, a clean fluid outlet, a dirty fluid inlet, and a dirty fluid outlet; (ii) a first fluid conduit comprising opposing end ports and intermediate ports; (iii) a second fluid conduit comprising opposing end ports and intermediate ports each fluidly connected with the clean fluid outlet of a corresponding pressure exchanger; (iv) a third fluid conduit comprising opposing end ports and intermediate ports each fluidly connected with the dirty fluid inlet of a corresponding pressure exchanger; and (v) a fourth fluid conduit comprising opposing end ports and intermediate ports each fluidly connected with the dirty fluid outlet of a corresponding pressure exchanger; (B) fluidly connecting the fluid manifold assembly with clean fluid pumps; (C) fluidly connecting the fluid manifold assembly with a source of a dirty fluid; and (D) fluidly connecting the fluid manifold assembly with a wellbore located at an oil and/or gas wellsite. 
     Coupling the fluid manifold segments together to form the fluid manifold assembly may comprise: coupling the opposing end ports of the first fluid conduits of the plurality of fluid manifold segments to form a first fluid conduit assembly of the fluid manifold assembly; coupling the opposing end ports of the second fluid conduits of the plurality of fluid manifold segments to form a second fluid conduit assembly of the fluid manifold assembly; coupling the opposing end ports of the third fluid conduits of the plurality of fluid manifold segments to form a third fluid conduit assembly of the fluid manifold assembly; and coupling the opposing end ports of the fourth fluid conduits of the plurality of fluid manifold segments to form a fourth fluid conduit assembly of the fluid manifold assembly. In such implementations, among others within the scope of the present disclosure, fluidly connecting the fluid manifold assembly with the clean fluid pumps may comprise fluidly connecting intermediate ports of the first fluid conduit assembly with inlets of corresponding clean fluid pumps. In such implementations, among others within the scope of the present disclosure, the method may further comprise fluidly connecting the clean fluid inlets of the plurality of pressure exchangers with outlets of corresponding clean fluid pumps. Each of the intermediate ports of the first fluid conduit may be fluidly connected with the clean fluid inlet of a corresponding pressure exchanger, and fluidly connecting the fluid manifold assembly with the clean fluid pumps may comprise fluidly connecting at least one of the opposing end ports of the first fluid conduit assembly with outlets of the clean fluid pumps. Fluidly connecting the fluid manifold assembly with the source of the dirty fluid may comprise fluidly connecting the third fluid conduit assembly with an outlet of the source of the dirty fluid. In such implementations, among others within the scope of the present disclosure, the method may further comprise fluidly connecting the second fluid conduit assembly with an inlet of the source of the dirty fluid. Fluidly connecting the fluid manifold assembly with the wellbore may comprise fluidly connecting the fourth fluid conduit assembly with the wellbore. 
     The source of the dirty fluid may be or comprise a mixer operable to produce the dirty fluid. 
     The dirty fluid may comprise well treatment fluid. 
     Each pressure exchanger may comprise a rotor, at least one chamber may extend through the rotor, and the method may further comprise operating each of the pressure exchangers to: receive the dirty fluid at a first pressure into the at least one chamber via the dirty fluid inlet; receive clean fluid at a second pressure into the at least one chamber via the clean fluid inlet to pressurize the dirty fluid to a third pressure, wherein the second and third pressures may be substantially greater than the first pressure; discharge the dirty fluid at the third pressure from the at least one chamber via the dirty fluid outlet; and discharge the clean fluid at a fourth pressure from the at least one chamber via the clean fluid outlet. 
     The method may further comprise, before coupling the plurality of fluid manifold segments together, transporting each of the fluid manifold segments to the wellsite. 
     The foregoing outlines features of several embodiments so that a person having ordinary skill in the art may better understand the aspects of the present disclosure. A person having ordinary skill in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same functions and/or achieving the same benefits of the embodiments introduced herein. A person having ordinary skill in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions and alterations herein without departing from the spirit and scope of the present disclosure. 
     The Abstract at the end of this disclosure is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.