Patent Publication Number: US-2013248182-A1

Title: Modular manifold of a wellsite fluid system and method of using same

Description:
BACKGROUND 
     The present disclosure relates to the field of well construction equipment. More particularly, the present disclosure relates particularly, but not by way of limitation, to flow control systems and components that may be used for well construction services techniques. The statements in this section merely provides information related to the present disclosure and may not constitute prior art, and may describe some embodiments illustrating the invention. 
     Oilfield operations may be performed to locate and gather valuable downhole fluids, such as hydrocarbons. Wellbores may be drilled to reach subsurface reservoirs and draw hydrocarbons to the surface. During drilling, various fluids may be deployed downhole to facilitate drilling, production, stimulation, completion and/or other operations. 
     In some cases, devices may be used for storing fluids, mixing fluids, and distributing fluids to the wellbore. Fluids may be passed into the wellbore by surface fluid equipment. Some fluid equipment may have devices, such as valves, pumps, etc., to facilitate flow of fluids. Examples of fluid equipment or techniques are provided in US Patent/Application Nos. 5232279, 20020001255, and 20030161212. 
     SUMMARY 
     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 key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter. 
     The techniques disclosed herein relate to a mobile manifold assembly of a fluid system for providing fluid to a wellsite during well construction. The wellsite has a rig positionable about a wellbore. The fluid system includes auxiliary components including at least one fluid source, at least one mixer and at least one high pressure pump. The mobile manifold assembly includes a modular manifold and a mobile frame. The modular manifold includes a plurality of manifold pumps, valves and pipes integrated together for transport. Connector portions of the pipes extend from the modular manifold in an arrangement corresponding to an arrangement of the auxiliary components to define a plug-in configuration therebetween such that the connector portions of the pipes are positionable in alignment with the auxiliary components for direct and removable connection therewith. The manifold pumps and valves are positioned about the pipes to selectively pump the fluid about the modular manifold and at least one of the auxiliary components. The mobile frame includes a base portion and a carrier portion. The modular manifold is securable to the base portion and the carrier portion of the mobile frame. The modular manifold is liftable via the mobile frame whereby the modular manifold is transportable to the auxiliary components for operable connection therewith. 
     The mobile manifold assembly may also include at least one knock off cap, at least one inlet, and/or at least one drain. At least one of the valves includes a butterfly valve. The butterfly valve may be automatically and manually activated. The manifold pumps selectively adjust fluid flow through the pipes. The pipes define a plurality of horizontal pipe portions and a plurality of vertical pipe portion, with the plurality of vertical pipe portions extending between the horizontal pipe portions. 
     The valves may be positionable about the pipes and provide selective fluid communication between the pipes and the auxiliary components. The manifold pumps may be positionable about the horizontal or vertical pipe portions. The mobile manifold assembly may also include knock off caps positioned at opposite ends of one of the horizontal portions, and/or inlets positioned between opposite ends of one of the horizontal portions. One of the horizontal portions may extend between a pair of the manifold pumps. Two of the vertical portions may extend between the one horizontal portion with the manifold pumps and another of the horizontal portions. The another of the vertical portions may extend between the another of the horizontal portions and yet another of the horizontal portions. 
     The connector portions may extend from one of the horizontal portions of the modular manifold. A portion of the connector portions may extend horizontally from the modular manifold and a portion of the connector portions may extend vertically from the modular manifold. The connector portions of the pipes may be connectable to the fluid source, mixer, and high pressure pump. The carrier portion may extend vertically above the base portion. The carrier portion may have a handle or a grip for lifting the frame. 
     In another aspect, the disclosure relates to a well construction fluid system for providing fluid to a wellsite during well construction. The wellsite has a rig positionable about a wellbore. The fluid system includes the auxiliary components and the mobile manifold assembly. 
     The auxiliary components may include a mixing portion, and a delivery portion. The delivery portion may include the high pressure pump, a motor, at least one drive shaft, and at least one slurry tank. The mixing portion may include the mixer, at least one mixing tank and at least one fluid source. The fluid source may include an averaging tank, a water/chemical supply, and a mixing water supply. The auxiliary components may include a supply portion, a pumping portion, a transfer portion, and a batch mixer portion. The batch mixer portion may include a batch mixer tank. 
     The auxiliary components may include a mixing portion, and the mobile manifold assembly may be integrated with the mixing portion. The mobile manifold assembly and the mixing portion may be positionable on a skid and transportable thereon. The mixer may include a single or a dual mixer. 
     Finally, in another aspect, the disclosure relates to a method for providing fluid to a wellsite during well construction. The wellsite has a rig positionable about a wellbore. The method involves providing a fluid system about a wellsite. The fluid system includes the auxiliary components and the mobile manifold assembly. The method also involves transporting the modular manifold to the auxiliary components using the mobile frame, operatively connecting the modular manifold to the auxiliary components, and pumping fluid to the wellbore using the modular manifold. 
     The method may also involve mixing the fluid with the at least one mixer, recirculating fluid between the auxiliary components and the modular manifold, and/or transporting the auxiliary components and the modular manifold assembly on a skid. The method may also involve selectively diverting fluid from the modular manifold to a mixing portion, a batch portion and/or a delivery portion of the fluid system. The method may also involve cementing the wellbore using the fluid pumped to the wellbore. The pumping may also involve pumping the fluid to the wellbore using the auxiliary components. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments of the method and system for performing well construction are described with reference to the following figures. Like reference numerals are intended to refer to similar elements for consistency. For purposes of clarity, not every component may be labeled in every drawing. 
         FIG. 1  is a schematic diagram illustrating a wellsite having a fluid system with a modular manifold in accordance with an embodiment of the present disclosure. 
         FIG. 2.1  is a block diagram illustrating a mixing process for a fluid system in accordance with an embodiment of the present disclosure.  FIGS. 2.2 , and  2 . 2 . 1 - 2 . 2 . 4  depict a table of various scenarios illustrating operation of the mixing process of  FIG. 2.1  in accordance with an embodiment of the present disclosure. 
         FIG. 3  is a block diagram illustrating an overall mixing process for a fluid system with a modular manifold in accordance with an embodiment of the present disclosure. 
         FIG. 4.1  is a schematic diagram illustrating a modular manifold in accordance with an embodiment of the present disclosure.  FIGS. 4.2  and  4 . 2 . 1 - 4 . 2 . 4  depict a table of various scenarios illustrating operation of the modular manifold of  FIG. 4.1  in accordance with an embodiment of the present disclosure. 
       FIGS.  5 . 1 - 5 . 4  are schematic views illustrating a modular manifold in accordance with an embodiment of the present disclosure. 
       FIGS.  6 . 1 - 6 . 4  are schematic views illustrating another modular manifold in accordance with an embodiment of the present disclosure. 
         FIGS. 7.1  and  7 . 2  are schematic diagrams illustrating modular single mixer configurations of a fluid system with modular manifold in accordance with an embodiment of the present disclosure. 
         FIGS. 8.1  and  8 . 2  are schematic diagrams illustrating modular dual mixer configurations of a fluid system with modular manifold in accordance with an embodiment of the present disclosure. 
       FIGS.  9 . 1 - 9 . 3  are schematic diagrams illustrating various views of portions of a modular fluid system with modular manifold in accordance with an embodiment of the present disclosure. 
         FIGS. 10.1  and  10 . 2  are schematic diagrams illustrating integrated configurations of a fluid system with modular manifold in accordance with an embodiment of the present disclosure. 
       FIGS.  11 . 1 - 11 . 3  are schematic diagrams illustrating various views of portions of an integrated fluid system with modular manifold in accordance with an embodiment of the present disclosure. 
         FIGS. 12.1  and  12 . 2  are schematic diagrams illustrating modular configurations of a mobile manifold assembly with modular manifold in accordance with an embodiment of the present disclosure. 
         FIGS. 13.1  and  13 . 2  are schematic diagrams illustrating integrated configurations of a modular manifold in accordance with an embodiment of the present disclosure. 
         FIG. 14  is a flow chart illustrating a fluid method in accordance with an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Specific embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Further, in the description of embodiments of the present disclosure, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the embodiments disclosed herein may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid unnecessarily complicating the description. 
     The present disclosure relates to devices and methods for providing fluid at a wellsite. Fluid systems may be provided for facilitating the mixing, pumping and delivery of the fluid. Part or all of the fluid systems may be portable, removable and/or modular. The fluid system may include local equipment, such as a mobile and removable manifold (and associated equipment), and auxiliary equipment, such as mixers, tanks, supplies and/or pumps (and associated equipment). As used herein, “local” may refer to components or operations of the fluid/slurry mixing manifold, and “auxiliary” may refer to components or operations of the remainder of the fluid system. The fluid system may be used for delivering fluid to the wellbore for performing well construction. As used herein ‘well construction’ includes operations, such as cementing used in completing the wellbore. 
     At least one embodiment of the present disclosure relates to a modular manifold that consolidates piping and flow control components, such as valves, into a compact, portable, modular and stand-alone product that can connect to various related components used for mixing and pumping slurries for well construction services, such as mixers, pumps, mixing and averaging tubs, displacement tanks and batch tanks. The modular manifold may also incorporate logic for mixing and pumping slurries for well construction services, such as recirculation, fluid transfer, gravity feed, and redundancies and backups for pump failures. At least one embodiment of the present disclosure may allow for scalability of multiple mixing systems through the use of one or multiple modular manifolds. 
     According to one or more aspects of the present disclosure, a portable and optimized fluid/slurry mixing manifold is provided, enabling flexibility in installations due to, at least, independence and modularity; and enabling a compact bounding volume optimized for transport and installation. According to at least one or more additional aspects of the present disclosure, a method for maintainability is provided for allowing: ease in maintenance and troubleshooting due to, at least, clear overall visual of the modular manifold; minimal volume of flushing/washing fluids due to, at least, compactness of the system; and ease in replacement of piping, if desired. According to at least one or more additional aspects of the present disclosure, a method and system for scalability of multiple mixing systems is provided. 
     In accordance with at least one embodiment of the present disclosure, the fluid system and modular manifold may be a modular fluid/slurry mixing (or fluid) system with modular manifold. The fluid system and/or modular manifold may be portable. The modular manifold may be connectable to pumping and mixing components of the fluid system using hoses or hard piping if desired. The modular manifold bounding volume allows the modular manifold to be transportable on trailers, both on land and offshore on shipping racks. 
     The bounding volume of the modular manifold may comprise overall dimensions that may be no more than 8 ft (or 2438.4 mm), or any dimension which corresponds with the ISO container width specification—ISO 668: “Series 1 freight containers—Classification, dimensions and ratings,” which is subject to change. It should be noted that various industry standards may exist which may dictate certain design requirements and objectives; therefore, the piping and components described herein may be designed and manufactured in accordance with those standards, for example, ASME B31.3. 
     The modular manifold may be adapted and re-sized to meet connection (or nozzle) points that may require exceeding the 8 ft (2.44 m) desired dimension. As opposed to having piping run across the skid or tight confined areas, the modular manifold may be easily accessible and visible for maintenance and troubleshooting. This level of modularity can enable the modular manifold to be deployed for various oilfield pumping equipment, and may allow a higher level of standardizing of piping design, for example, piping designed for mixing fluid/slurry. Moreover, the modular manifold, apparatus, systems and methods presented herein may be configured to reduce the learning curve for operators. 
     These together with other aspects, features, and advantages of the present disclosure, along with the various features of novelty, which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. The above aspects and advantages are neither exhaustive nor individually or jointly critical to the spirit or practice of the disclosure. Other aspects, features, and advantages of the present disclosure will become readily apparent to those skilled in the art from the following detailed description in combination with the accompanying drawings. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not restrictive. 
     Referring to the drawings, illustrations, pictures and attachments and in particular  FIG. 1 , a wellsite  100  that is an example environment in which the present disclosure may be implemented is depicted. The wellsite  100  is depicted at an offshore location, but may be land-based or in other configurations. The wellsite  100  includes a platform  102  with a rig  104  and a fluid system  106 . The platform  102  has a riser  108  extending to a wellbore  110  in the sea floor  112 . 
     The fluid system  106  includes pumping equipment  114 , mixing manifold(s)  118 , and mixers  120 . The fluid system  106  may be a modular system positionable about the wellsite  100 . The fluid system  106  may be fluidly coupled to the riser  108  via surface equipment for providing fluid thereto. The fluid system  106  may be used to mix and pump fluids to the wellbore  110 , for example, for drilling, cementing, or other purposes. In an example, the fluid system  106  may be cementing equipment that is used to mix and pump slurries down the well for well construction (e.g., zonal isolation, cementing, etc.). 
       FIGS. 2.1  and  2 . 2  are block flow diagrams depicting an example fluid system  206  for performing modular fluid/slurry mixing and pumping. The fluid system  206  may be used to provide fluids to a wellbore as shown, for example, in  FIG. 1 . 
     The system  206  includes a primary mixing portion  230 , a supply portion  232 , a pump portion  234 , a secondary mixing portion  236 , a batch mixing portion  238 , and a delivery portion  240 . The primary mixing portion  230  includes a mixing water supply  242 , a water/chemical supply  244 , and an averaging tank  245 . The mixing water supply  242 , water/chemical supply  244 , and the averaging tank  245  may store fluids therein and/or be linked to storage facilities for receiving fluids. The mixing water supply  242  may include water or other fluids defining the mixing water supply  242  fluids. The water/chemical supply  244  may include seawater or other fluids defining the water/chemical supply fluids. The averaging tank  245  may include cement slurries or other fluids defining the averaging tank  245  fluids. 
     The mixing water supply  242  is fluidly coupled to mixers  246 . 1  and  246 . 2 , and mixing tanks  248 . 1  and  248 . 2 , and delivers the mixing water supply  242  fluids thereto. The mixing water supply  242  fluids may be selectively provided to one or more of the mixers  246 . 1 ,  246 . 2  and/or mixing tanks  248 . 1 ,  248 . 2 . The mixers  246 . 1 ,  246 . 2  deliver fluid to the mixing tanks  248 . 1 ,  248 . 2 . 
     The mixing tanks  248 . 1 ,  248 . 2 , water/chemical supply  244 , and averaging tank  245  pass fluid to the pumping portion  234  via supply portion  232 . The pumping portion  234  includes manifold pumps  250 . 1 ,  250 . 2 . The supply portion  232  includes pipes (or flowlines) S 1 -S 4  extending from mixing tank  248 . 2 , averaging tank  245 , water/chemical supply  244  and mixing tank  248 . 1 , respectively, to pump  250 . 2 . The supply portion  232  also includes pipes S 5 -S 7  extending from averaging tank  245 , water/chemical supply  244  and mixing tank  248 . 1 , respectively, to pump  250 . 1 . The pumps  250 . 1 ,  250 . 2  may be fluid pumps capable of driving fluid from the initial mixing portion  230  and through the remainder of the fluid system  206  and to the platform  102  for use (see, e.g.,  FIG. 1 ). 
     Referring still to  FIG. 2.1 , the pump  250 . 2  is fluidly coupled back to mixer  246 . 1 ,  246 . 2  and mixing water supply  242 , respectively, via mixing pipes M 1 , M 2  and M 3 , respectively, until mixed as desired. The pump  250 . 1  is fluidly coupled back to the mixer  246 . 1  via mixing pipe M 4  until mixed as desired. Fluid is also pumped from pump  250 . 2  to the batch mixing portion  238  via pipe B 3  and from pump  250 . 1  to the batch mixing portion  238  via pipe B 4 . 
     The batch mixing portion  238  includes batch mixer tank(s)  252 . Fluid from pumps  250 . 1 ,  250 . 2  may be passed to the batch mixer tanks  252  via pipes B 3  and B 4 , respectively. Fluid may also be passed from pumps  250 . 1  and  250 . 2  to the batch mixing portion  238  and fluidly coupled to the batch mixer tanks  252  via valve B 5 . Fluid may also be diverted from the batch mixing tanks  252  back to pumps  250 . 1 ,  250 . 2  via pipes B 2  and B 1 , respectively. 
     Fluid may then be passed from the pumps  250 . 1 ,  250 . 2  via pipes D 1  and D 2  and from batch mixer tank(s)  252  via pipe B 5  to intersection I 1 . From intersection I 1 , fluid may then flow to the delivery portion  240  via pipes D 3  and D 4 . The delivery portion  240  includes a high pressure pump  254 . Fluid may be passed from valve B 5  to the high pressure pump  254  via pipe D 3 . Fluid may also be delivered back to the averaging tank  245  or batch mixer  252 , if desired, via pipe D 4 . 
     The pumps  250 . 1 ,  250 . 2  and related equipment, such as pipes (or pipes) S 1 -S 7 , M 1 -M 4 , B 1 -B 5 , D 1 -D 4 , may be considered “local” components. Fluid flow relating to these local components may be referred to as “local process flow.” The remainder of the components may be considered “auxiliary components.” Fluid flow relating to these auxiliary components may be considered “auxiliary process flow.” 
     While the system  206  depicts certain pipes, tanks, pumps, mixers and other components, the system  206  may include various numbers of the various supplies, pumps, mixers, tanks, etc. Also, various fluid control devices, such as valves, pipes, etc. may be provided to facilitate the flow of fluid through the system  206  as desired. More examples of various fluid systems and manifolds are provided herein. 
     Referring to  FIGS. 2.1  and  2 . 2 , the fluid system (and modular fluid/slurry mixing manifold)  206  may be used in various scenarios.  FIGS. 2.2  and  2 . 2 . 1 - 2 . 2 . 4  include a table  251  including various process flow combinations. The table  251  provides examples of various scenarios which may be performed by at least one embodiment of the fluid system disclosed herein. By way of example, scenario D 4  is an example process flow that may be used. Scenario D 4  involves re-circulating to the averaging tank  245  or batch mixer tank(s)  252 . 
     As shown in Table  251 , scenarios A1-35, B 1-3 and C1-7 are provided along the left side of the Table  251 . These scenarios refer to A) scenarios for pumpers where there may be additional pumps and with complete backup or redundancy, B) scenarios with no additional pumps and no backup or redundancy, and C) other scenarios. Along the top of Table  251 , pipes S 1 -S 7 , M 1 -M 4 , B 1 -B 5  and D 1 -D 4  ( FIG. 2.1 ) are provided indicating flow for the various scenarios. Below is a summary of the various scenarios, which are neither exhaustive or limiting:
     A. Scenarios A1-A35: For pumpers where there may be additional pump(s) to supply mixing water to the mixer(s), the role of the manifold is to facilitate and control the fluid/slurry mixing logic, with complete backup or redundancy. Scenarios 1-8 are depicted as examples for pumpers with a single mixer and mixing tank i.e., mixer  246 . 1  and mixing tank  248 . 1 ; whereas, scenarios 9-35 are depicted as examples for pumpers with dual mixers  246 . 1 ,  246 . 2  and mixing tanks i.e., an additional mixer  246 . 2  and mixing tank  248 . 2 , and a common averaging tank  245 . Dual mixing can also be achieved with two totally independent mixing manifolds. In this case, the mixing logic and redundancies for each system may remain the same as scenarios A1-8. Such dual mixing can also be extended to as many mixing systems as needed. The following example scenarios may be implemented in accordance with at least one embodiment of the present disclosure:
       1. Pump  250 . 1  may be used to re-circulate fluid/slurry between mixing tank  248 . 1  and mixer  246 . 1 . After the desired density/property is achieved and the fluid/slurry flows to the averaging tank  245 , pump  250 . 2  may be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .   2. If pump  250 . 1  is down, pump  250 . 2  may be used to re-circulate fluid/slurry between mixing tank  248 . 1  and Mixer  246 . 1 . After the desired density/property is achieved, pump  250 . 2  may also be used to concurrently transfer fluid/slurry from mixing tank  248 . 1  to the High pressure pump(s)  254 , while maintaining re-circulation.   3. If pump  250 . 2  is down, pump  250 . 1  may be used to re-circulate fluid/slurry between mixing tank  248 . 1  and mixer  246 . 1 . After the desired density/property is achieved, pump  250 . 1  may also be used to concurrently transfer fluid/slurry from mixing tank  248 . 1  to the high pressure pump(s)  254 , while maintaining re-circulation.   4. Same process objectives as scenario (1), but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  may then deliver fluid/slurry to the high pressure pump(s)  254 .   5. Same process objectives as scenario (2) but fluid/slurry is delivered from mixing tank  248 . 1  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  may then deliver fluid/slurry to the high pressure pump(s)  254 .   6. Same process objectives as scenario (3) but fluid/slurry is delivered from mixing tank  248 . 1  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  may then deliver fluid/slurry to the high pressure pump(s)  254 .   7. Same process objectives as scenario (1) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 2  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 2  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   8. Same process objectives as scenario (1), but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 2  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   9. For the dual mixers option, there may be two additional external pumps used to re-circulate fluid/slurry between mixer  246 . 1  and mixing tank  248 . 1 , and mixer  246 . 2  and mixing tank  248 . 2  respectively. Also, both pump  250 . 1  and pump  250 . 2  can be available. When the desired density/property for both mixing tanks is reached and fluid/slurry flows to the averaging tank  245 , pump  250 . 1  or pump  250 . 2  may be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .   10. Same process objectives as scenario (9), except that if pump  250 . 2  is down, pump  250 . 1  may be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .   11. Same process objectives as scenario (9), except that if pump  250 . 1  is down, pump  250 . 2  may be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .   
       

     12. Same process objectives as scenario (9), except when higher fluid/slurry delivery rates are desired, pump  250 . 1  and pump  250 . 2  may both be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .
         13. Same process objectives as scenario (9), if mixer  246 . 1 -mixing tank  248 . 1  external re-circulation pump is down, pump  250 . 1  can take over the role of that pump (while mixer  246 . 2 -mixing tank  2  external re-circulation pump can still operate). When the desired density/property for both mixing tanks is reached and fluid/slurry flows to the averaging tank  245 , pump  250 . 2  may be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .   14. Same process objectives as scenario (9), if mixer  246 . 2 -mixing tank  248 . 2  external re-circulation pump is down, pump  250 . 2  can take over the role of that pump (while mixer  246 . 1 -mixing tank  248 . 1  external re-circulation pump can still operate). When the desired density/property for both mixing tanks is reached and fluid/slurry flows to the averaging tank  245 , pump  250 . 1  may be used to transfer fluid/slurry from the averaging tank  245  to the high pressure pump(s)  254 .   15. For the dual mixers option, if a common averaging tank  245  is not available (e.g., due to space constraints) or both external re-circulation pumps are down, pump  250 . 1  and pump  250 . 2  may be used to re-circulate fluid/slurry between mixer  246 . 1  and mixing tank  248 . 1 , and mixer  246 . 2  and mixing tank  2  respectively. When the desired density/property for both mixing tanks is reached, pump  250 . 1  and pump  250 . 2  can transfer fluid/slurry from mixing tank  248 . 1  and mixing tank  248 . 2  respectively, to the high pressure pump(s)  254 .   16. Same process objectives as scenario (9) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   17. Same process objectives as scenario (10) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   18. Same process objectives as scenario (11) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   19. Same process objectives as scenario (12) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   20. Same process objectives as scenario (13) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   21. Same process objectives as scenario (14) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   22. Same process objectives as scenario (15) but fluid/slurry is delivered from mixing tank  248 . 1  and mixing tank  248 . 2  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   23. Same process objectives as scenario (9) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  may be used to transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 . Pump  250 . 2  may then be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   24. Same process objectives as scenario (9) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  or pump  250 . 2  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 1  or pump  250 . 2  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   25. Same process objectives as scenario (9) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  or pump  250 . 2  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   26. Same process objectives as scenario (10) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 1  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   27. Same process objectives as scenario (10) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   28. Same process objectives as scenario (11) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 2  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 2  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   29. Same process objectives as scenario (11) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 2  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   30. Same process objectives as scenario (12) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  and pump  250 . 2  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 1  and pump  250 . 2  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   31. Same process objectives as scenario (12) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  and pump  250 . 2  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   32. Same process objectives as scenario (13) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 2  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 2  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   33. Same process objectives as scenario (13) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 2  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   34. Same process objectives as scenario (14) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 1  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   35. Same process objectives as scenario (14) but fluid/slurry is delivered from the averaging tank  245  to the batch mixer tank(s)  252 , and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  may be used to concurrently transfer fluid/slurry from the averaging tank  245  to the batch mixer tank(s)  252 , and from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .       B. Scenarios B1-B3: For pumpers where there may be no additional pump to supply mixing water, and/or where there is no backup or redundancy. The following possible scenarios may be implemented in accordance with at least one embodiment of the present disclosure:
       1. Unlike pumper variation A, pump  250 . 2  may be used to supply mixing water to mixer  246 . 246 . 1  and mixing tank  248 . 1 . Pump  250 . 1  may be used to re-circulate fluid/slurry between mixing tank  248 . 1  and mixer  246 . 1 . After the desired density/property is achieved, pump  250 . 1  may also be used to concurrently transfer fluid/slurry from mixing tank  248 . 1  to the high pressure pump(s)  254 , while maintaining re-circulation.   2. Same process objectives as scenario (B)(1) but fluid/slurry is delivered from mixing tank  248 . 1  to the batch mixer tank(s)  252 . Pumps from the batch mixer tank(s)  252  can then deliver fluid/slurry to the high pressure pump(s)  254 .   3. Same process objectives as scenario (B)(1) but fluid/slurry is delivered from mixing tank  248 . 1  to the batch mixer tank(s)  252  and when batch mixer tank(s)  252  pumps are not available. Pump  250 . 1  may be used to transfer a fixed desired volume of fluid/slurry to the batch mixer tank(s)  252 , subsequently pump  250 . 1  may also be used to transfer fluid/slurry from the batch mixer tank(s)  252  to the high pressure pump(s)  254 .   
       C. Scenarios C1-7: Other possible scenarios related to general fluid/slurry delivery may be implemented in accordance with at least one embodiment of the present disclosure:
       1. When higher delivery rates are desired, pumps  250 . 1 ,  250 . 2  may be used to transfer fluids from the water/chemical supply  244  to the high pressure pump(s)  254 .   2. If pump  250 . 2  is down, pump  250 . 1  may be used to transfer fluids from the water/chemical supply  244  to the high pressure pump(s)  254 .   3. If pump  250 . 1  is down, pump  250 . 2  may be used to transfer fluids from the water/chemical supply  244  to the high pressure pump(s)  254 .   4. When higher delivery rates are desired, pump  250 . 1  and pump  250 . 2  may be used to transfer fluids from the water/chemical supply  244  to the high pressure pump(s)  254 .   5. Same process objectives as scenario (1) but fluid from the water/chemical supply  244  may be delivered to the batch mixer tank(s)  252  (or any other destination).   6. Same process objectives as scenario (2) but fluid from the water/chemical supply  244  may be delivered to the batch mixer tank(s)  252  (or any other destination).   7. Same process objectives as scenario (3) but fluid from the water/chemical supply  244  may be delivered to the batch mixer tank(s)  252  (or any other destination).   
       

       FIG. 3  is a simplified flow diagram of a fluid system  206  which depicts a mixing modular manifold  336  as an interface between the mixer  330  and high pressure pump(s)  354  that are used to deliver the mixed fluids to the wellsite. 
     The mixer  330  includes mixers  246 , mixing tanks  248 , averaging tanks  245 , mixing fluid supply  242  and batch mixer tank  252 . The mixer  330  passes fluid to the mixing modular manifold  336 . Fluid is recirculated to the mixer via mixing recirculation lines  337  as indicated by the arrows. The fluid may then be passed from the mixing modular manifold  336  to the high pressure pump  354 , and on to the wellhead at the wellbore. 
     Although the example scenarios have been described in  FIGS. 1-3  are with reference to specific implementations, the present disclosure is not to be limited by or to such implementations and/or embodiments. For example, scenarios may exist where either one or both pumps  250 . 1 ,  250 . 2  are replaced by external pumps to perform substantially similar functions. Moreover, equivalent functional scenarios may be encompassed within the scope of the present disclosure, such as the multiple usages of nozzle points, or the use of pits rather than batch mixer tank(s)  252 . Furthermore, subsets of scenarios described above may exist, for example, in scenario (26), a single pump may be utilized to transfer fluid from the batch mixer tank(s)  252  to the high pressure pump(s)  254 . In addition, combinations of scenarios or combinations of subsets of scenarios are encompassed in all such modifications, variations and enhancements of at least one embodiment of the present disclosure. Various combinations of the fluid systems (e.g.,  106 ,  206  and/or  306 ) may be combined as desired to achieve desired configurations. 
     Referring now to  FIGS. 4.1  and  4 . 2 , an example design of a modular fluid/slurry mixing modular manifold  436  is depicted in accordance with at least one embodiment of the present disclosure. The modular manifold may include flow control systems and components that may be used for well construction services. The modular manifold  436  as shown in  FIG. 4.1  includes pumps  250 . 1 ,  250 . 2 , pipes  254 . 1 - 254 . 13 , valves V 1 -V 22 , and intersections  257 . 1 - 257 . 10 . The pipes  254 . 1 - 254 . 13  may have connection points  1 - 13  (e.g., nozzles, or inlets or other devices), respectively, to manipulate flow into and out of the modular manifold  436  through pipes  254 . 1 - 254 . 13 . Connectors (not shown) may be provided for connection to the remainder of the fluid system for fluid communication therewith. 
     At connection point  1 , pipe  254 . 1  fluidly couples averaging tank  245  to intersection  257 . 1  via valve V 1 . At connection point  2 , pipe  254 . 2  fluidly couples mixing tank  248 . 1  to intersection  257 . 2  via valve V 9 . At connection point  3 , pipe  254 . 3  fluidly couples displacement tank or auxiliary water/chemical supply  244  to intersection  257 . 1  via valve V 14 . At connection point  4 , pipe  254 . 4  fluidly couples auxiliary mixer  246 . 1  to intersection  257 . 3  via valve V 12 . At connection point  5 , pipe  254 . 5  fluidly couples averaging tank  245  and batch mixer tank(s)  252  to intersection  257 . 7  via valve V 7  if desired. At connection point  6 , pipe  254 . 6  fluidly couples suction of high pressure pump(s)  254  to intersection  257 . 7  via valve V 8 . 
     At connection point  7 , pipe  254 . 7  optionally fluidly couples batch mixer tank(s)  252  to intersection  257 . 4  via valve V 16 . At connection point  8 , pipe  254 . 8  optionally fluidly couples batch mixer tank(s)  252  and high pressure pump(s)  254  to intersection  257 . 5  via valve V 17 . At connection point  9 , pipe  254 . 9  optionally fluidly couples additional mixing tank  248 . 2  for a dual mixers  446  to intersection  257 . 9  via valve V 18 . At connection point  10 , pipe  254 . 10  fluidly couples auxiliary mixer  246 . 1  for pumper variation B or additional auxiliary mixer  246 . 2  for dual mixers to intersection  257 . 8  via valve V 19 . At connection point  11 , pipe  254 . 11  fluidly couples batch mixer tank(s)  252  to intersection  257 . 9 . At connection point  12 , pipe  254 . 12  fluidly couples batch mixer tank(s)  252  to intersection  257 . 2 . At connection point  13 , pipe  254 . 13  fluidly couples drain  456  to intersection  257 . 10  via valve V 21 . 
     Pump  250 . 2  is fluidly coupled to intersection  257 . 9  via valve V 3 , and to intersection  257 . 8  via valve V 4 . Pump  250 . 1  is fluidly connected to intersection  257 . 2  via valve V 10 , and to intersection  257 . 3  via valve V 11 . Valve V 15  fluidly couples intersections  257 . 10  and  257 . 2 . Valve V 2  fluidly couples intersections  257 . 1  and  257 . 9 . Valve V 5  fluidly couples intersections  257 . 8  and  257 . 9 . Valve V 6  fluidly couples intersections  257 . 6  and  257 . 5 . Valve V 20  fluidly couples intersections  257 . 3  and  257 . 4 . 
     The modular manifold  436  may also be provided with other fluid control or other devices, such as knock-off caps for cleaning and inspection at strategic points as will be described further herein. Valves V 16  and V 17  may be optional depending on whether batch mixer tank(s)  252  are used. Valve V 18  may be optional depending on whether dual mixers  246 . 1 ,  246 . 2  are used. Valve V 19  may be optional depending on whether dual mixers  246 . 1 ,  246 . 2  and/or mixing water supply  242  are used. 
     In an example, valve V 7  may be adjustable to compensate for increased re-circulation flow to the averaging tank  245  or batch mixer tank(s)  252 , and may ensure against insufficient suction pressure at the high pressure pump(s)  254 . For conditions where either one of pumps  250 . 1 ,  250 . 2  is down, valve V 16  may be adjustable to ensure that maximum supply rate to the batch mixer tank(s)  252  does not come at the expense of insufficient re-circulation rate and pressure for mixing. Valve V 6  may be adjustable to optimize re-circulation rate and pressure when it is desired to mix and pressurize high pressure pump(s)  254  simultaneously. 
     Referring to  FIGS. 4.2  and  4 . 2 . 1 - 4 . 2 . 4 , a table  437  is provided depicting possible valve combinations and connection points listed as examples to correspond with at least one of the various scenarios discussed herein. An example logic table is indicated therein by numerical sequence, which may be referenced for logic explanation and not particularly for physical operating sequence. For the valve combinations referenced in table  437 , one may assume that the valves are closed by default. 
     As shown in table  437 , various scenarios are provided for valve combinations involving valves V 1 -V 22  being actuated in the order sequence of 1, 2, 3 and so forth. The scenarios include A1-35, B1-3 and C1-7 as previously described. 
     Referring now to FIGS.  5 . 1 - 6 . 4 , example modular fluid/slurry mixing modular manifolds are presented therein in accordance with certain embodiments of the present disclosure. Each modular fluid/slurry mixing manifold presented in FIGS.  4 . 1 - 5 . 4  includes a centrifugal pump, for example an RA5X6 (inlet 6 in (15.24) and outlet 5 in (12.70)). Moreover, each modular fluid/slurry mixing manifold presented may be designed to facilitate fluid/slurry mixing logic, and may be modular and compact so as to fit within a specified bounding volume. 
     The fluid/slurry mixing manifold constructed in accordance with the present disclosure may be designed and manufactured in accordance to ASME B31.3, having flanges and buttweld fittings designed to meet ASME B16.5 and ASME B16.9 respectively, and welds designed for Non-Destructive Testing (NDT). The nozzles (e.g., N 7  and N 8 ) may be arranged such that the batch mixer tank(s)  252  can be installed from either side of the manifold, thereby enhancing flexibility in installations. 
     FIGS.  5 . 1 - 5 . 4  depict front, perspective, rear and side views, respectively, of modular manifold  536  and FIGS.  6 . 1 - 6 . 4  depict front, perspective, rear and side views, respectively, of modular manifold  636  in a physical configuration removable connectable to a fluid system, such as those described herein. In the examples of modular fluid/slurry mixing manifolds, FIGS.  5 . 1 - 5 . 4  depict the modular manifold  536  and centrifugal pumps  250 . 1 ,  250 . 2  installed vertically, and FIGS.  6 . 1 - 6 . 4  depict the modular manifold  636  and centrifugal pumps  250 . 1 ,  250 . 2  installed horizontally in accordance with at least one embodiment of the present disclosure. The modular manifolds  536  and  636  are constructed as unitary component that is transportable and modularly connectable between a mixer  330  and high pressure pumps  354  of a fluid system for passing fluid therebetween as shown, for example, in  FIG. 3 . 
     The modular manifolds  536 ,  636  each include pumps  250 . 1 ,  250 . 2 , pipes  254 . 1 - 254 . 13 , valves V 1 -V 22 , intersections  257 . 1 - 257 . 10 , and nozzles N 1 - 13  operable as schematically depicted in  FIG. 4.1 . Inlets  562 . 1 ,  562 . 2  depict options for receiving fluid/slurry from batch mixer tank(s)  252 . The modular fluid/slurry mixing manifold is also shown to include knock-off caps  560 , which may be placed at strategic locations for cleaning and inspection. 
     In the vertical configuration of FIGS.  5 . 1 - 5 . 4 , the modular manifold  536  includes horizontal portions  564 . 1 - 564 . 3  and vertical portions  566 . 1 - 566 . 4 . Horizontal portion  564 . 1  extends from inlet  562 . 1  to  562 . 2 . Horizontal portion  564 . 2  extends from knockoff cap  560 . 1  to knockoff cap  560 . 2 . Horizontal portion  564 . 3  extends from V 4  to V 11 . Vertical portion  566 . 1  extends between horizontal portions  564 . 1 ,  564 . 2 . Vertical portions  566 . 2 ,  566 . 3  extend between opposite ends of horizontal portions  564 . 2 ,  564 . 3 . Centrifugal pumps  250 . 1 ,  250 . 2  are positioned about the vertical portions  566 . 2 ,  566 . 3 . 
     In the horizontal configuration of FIGS.  6 . 1 - 6 . 4 , the modular manifold  636  includes horizontal portions  664 . 1 - 664 . 3  and vertical portions  666 . 1 - 666 . 4 . Horizontal portion  664 . 1  extends from knockoff cap  660 . 1  to knockoff cap  660 . 2 . Horizontal portion  664 . 2  extends from valve V 19  to knockoff cap  660 . 3 . Horizontal portion  664 . 3  extends from valve V 18  to knockoff cap  660 . 34 . Vertical portions  666 . 2 ,  666 . 3  extend between opposite ends of horizontal portions  664 . 1 ,  664 . 2 . Vertical portion  666 . 1  extends between horizontal portions  664 . 2 ,  664 . 3 . Centrifugal pumps  250 . 1 ,  250 . 2  extend from opposite ends of horizontal portion  664 . 3 . 
     The modular manifold  536 ,  636  may also be provided with connectors  253  for operative connection with portions of the fluid system. The connectors  253  may releasably connect the modular manifold to the fluid system when positioned adjacent thereto. Various connectors may be provided for linking portions of the modular manifold  536 ,  636  to the various components of the fluid system, such as at connection points  1 - 13 . 
     The modular manifolds herein may be used as part of fluid systems, such as those of FIGS.  1  and  2 . 1 . The fluids system may be configured to receive the modular manifold. FIGS.  7 . 1 - 9 . 2  depict various configurations of a fluid system  706 . 1 ,  706 . 2 ,  806 . 1 ,  806 . 2 ,  906 . 1 ,  906 . 2  with a modular manifold. Each of these fluid systems includes a mixer portion, a modular manifold and a delivery portion. 
       FIGS. 7.1  and  7 . 2  depict a single mixer configuration. These figures include a horizontal single mixer fluid system  706 . 1  and a vertical single mixer fluid system  706 . 2 , respectively. As demonstrated by these figures, the fluid system may be in a variety of configurations such that fluid is mixed, pumped and delivered to the wellbore as shown in FIGS.  1  and  2 . 1 - 2 . 3 . 
     The fluid system  706 . 1  includes a mixing portion  730 , a modular manifold  736 , and a delivery portion  740 . The mixing portion  730  includes a mixer  746 , an averaging tank  745  and a mixing tank  748 . The mixing portion  730  receives and mixes fluids. The mixed fluids are passed from mixer  746  to the averaging tank  745  and the mixing tank  748 . 
     The modular manifold  736  is removably fluidly coupled to the mixing tank  748  and the averaging tank  745  for receiving fluids therefrom. The modular manifold  736  may recirculate fluid to the mixing portion  730 , and then passes the fluid as mixed slurry  753  on to the delivery portion  740 . The delivery portion includes high pressure pumps  754  and a motor (e.g., a prime mover engine/motor)  755 . Drive shafts  757  may be provided between the motor  755  and the high pressure pumps  754  for driving the pumps  754 . 
       FIGS. 8.1  and  8 . 2  depict a dual mixer configuration. These figures include a horizontal dual mixer fluid system  806 . 1  and a vertical dual mixer fluid system  806 . 2 , respectively. As demonstrated by these figures, the fluid system may be in a variety of configurations such that fluid is mixed, pumped and delivered to the wellbore as shown in FIGS.  1  and  2 . 1 - 2 . 3 . 
     The fluid system  806 . 1  includes a mixing portion  830 , a modular manifold  836 , and a delivery portion  840 . The mixing portion  830  includes mixers  846 , an averaging tank  845  and mixing tanks  848 . The mixing portion  830  receives and mixes fluids. The mixed fluids are passed from mixers  846  to the averaging tank  845  and the mixing tank  848 . 
     The modular manifold  836  is removably fluidly coupled to the mixing tank  848  and the averaging tanks  845  for receiving fluids therefrom. The modular manifold  836  may recirculate fluid to the mixing portion  830 , and then passes the fluid as mixed slurry  853  on to the delivery portion  840 . The delivery portion includes high pressure pumps  854  and a motor (e.g., a prime mover engine/motor)  855 . Drive shafts  857  may be provided between the motor  855  and the high pressure pumps  854  for driving the pumps  854 . 
     FIGS.  9 . 1 - 9 . 3  depict an example configuration of the fluid systems  706 . 1 ,  706 . 2 ,  806 . 1 , and/or  806 . 2 .  FIG. 9.3  is a plan view of the fluid assembly  706 . 1 ,  806 . 1 .  FIG. 9.1  is a perspective view of the mixing portion  730 ,  830  removed from the fluid system  706 . 1 ,  806 . 2 .  FIG. 9.2  depicts the modular manifold  736 ,  836  removed from the fluid system  706 . 1 ,  806 . 1 . 
       FIGS. 10.1  and  10 . 2  depict an integrated manifold configuration. These figures include a horizontal integrated fluid system  1006 . 1  and a vertical integrated fluid system  1006 . 2 , respectively. As demonstrated by these figures, the fluid system may be in a variety of configurations such that fluid is mixed, pumped and delivered to the wellbore as shown in FIGS.  1  and  2 . 1 - 2 . 3 . 
     The fluid system  1006 . 1  includes an integrated mixing and manifold portion  1031 , and a delivery portion  1040 . The integrated portion  1031  includes a mixing portion  1030  and modular manifold  1036 . The mixing portion  1030  and the modular manifold  1036  may be integrated into a unitary structure for transport. The integrated portion  1031  may be positioned on a skid  1074  movably positionable about the wellsite and/or the delivery portion  1040 . 
     The mixing portion  1030  includes mixers  1046 , an averaging tank  1045  and mixing tanks  1048 . The integrated portion  1031  receives and mixes fluids. The mixed fluids are passed from mixers  1046  to the averaging tank  1045  and the mixing tank  1048 . The modular manifold  1036  is removably fluidly coupled to the mixing tank  1048  and the averaging tank  1045  for receiving fluids therefrom. 
     The modular manifold  1036  may recirculate fluid to the mixing portion  1030 , and then passes the fluid on to the delivery portion  1040 . The delivery portion includes high pressure pumps  1054  and a motor (e.g., a prime mover engine/motor)  1055 . Drive shafts  1057  may be provided between the motor  1055  and the high pressure pumps  1054  for driving the pumps  1054 . 
     FIGS.  11 . 1 - 11 . 3  depict an example configuration of the fluid systems  1006 . 1  and/or  906 . 2 .  FIG. 11.3  is a plan view of the fluid assembly  1006 . 1  depicting the pumping equipment.  FIG. 11.1  is a perspective view of the mixing portion  1030  removed from the fluid system  1006 . 1 .  FIG. 11.3  depicts the mixing manifold  1036  removed from the fluid system  1006 . 1 . 
     FIGS.  12 . 1 - 13 . 2  depict various configurations of a modular manifold usable with the various fluid systems herein. These figures may use aspects of the manifold configurations described herein, such as the pipe, valves and pumps as previously described.  FIGS. 12.1  and  12 . 2  show a modular manifold  1236  mounted on a frame  1270  to form a mobile manifold assembly.  FIGS. 13.1  and  13 . 2  show a modular manifold without a frame. 
       FIGS. 12.1  and  12 . 2  depict front and rear perspective views, respectively, of the modular manifold  1236 . This modular manifold  1236  may be used, for example, with the configurations of FIGS.  7 . 1 - 9 . 3  and incorporate the valves V 1 - 21 , inlets  1 - 13 , pipes  254 . 1 - 254 . 13 , and pumps  250 . 1 ,  250 . 2  (only some of which are shown in these figures). In the configuration shown, the modular manifold  1236  includes two pumps  1250 . 1 ,  1250 . 2  fluidly coupled via pipes and valves to auxiliary equipment of the fluid system. A flow control valve  1272  (e.g., butterfly valve with manual lever) is also provided for fluidly coupling to the remainder of the fluid system. 
     As shown in  FIGS. 12.1  and  12 . 2 , the modular manifold  1236  fluidly couples to averaging tank  245  at connection point  1 , mixing tank  248  at connection point  2 , displacement tank or auxiliary water/chemical supply  244  at connection point  3  (not shown), to auxiliary mixer  246 . 2  at connection point  4  (not shown), re-circulation to averaging tank  245  or batch mixer tank(s)  252  if required at connection point  5 , to densitometer flow meter and suction of high pressure pump(s)  254  at connection point  6 , to batch mixer tank(s)  252  (optional) at connection point  7 , from batch mixer tank(s)  252  to high pressure pump(s)  254  (optional) at connection point  7 , from additional mixing tank  248 . 2  for dual mixers option (optional) at connection point  9 , to auxiliary mixer  246 . 2  for pumper variation B or to additional auxiliary mixer  246 . 2  for dual mixers at connection point  10 , from batch mixer tank(s)  252  to pump  250 . 2  at connection point  11 , from batch mixer tank(s)  252  to pump  1  at connection point  12 , and to drain  456  at connection point  13 . Knock-off caps may also be provided for cleaning and inspection at strategic. 
     This modular manifold  1236  and the frame  1270  form a mobile manifold assembly for lifting, transporting and supporting the modular manifold  1236 . The frame  1270  may be configured for connection to the fluid system. As shown, the frame  1270  includes a base portion  1271 , vertical support  1273  and brackets  1275  made up of a plurality of bars forming a grid for supporting the modular manifold  1236 . The base portion  1271  may be a frame, skid or other platform for supporting the modular manifold  1236  on the ground or other surface. The carrier portion  1273  is operatively connected to the base portion  1271  and extends a distance above. The carrier portion  1273  may be used to provide support to portions of the modular manifold  1236 . The carrier portion  1273  may also be provided with a handle, grips or other devices for lifting the modular manifold  1236 . The brackets  1275  are provided to support the pumps  250 . 1 ,  250 . 2 . Additional supports, such as brackets  1275  may also be provided for supporting various portions of the modular manifold  1236  on the frame  1270 . The modular manifold  1236  may be securable to the base portion  1271  and the carrier portion  1273  of the mobile frame  1270 . The modular manifold is liftable via the mobile frame  1270  whereby the modular manifold is transportable to the auxiliary components for operable connection therewith. 
     Portions of the modular manifold  1236  may be positioned about the frame  1270  to facilitate transport, delivery, connection and operation of the modular manifold  1236 . As shown, the horizontal portions of the pipes extend along linear bars forming the frame. Portions of the modular manifold  1236  extend through the frame  1270  such that a portion of the modular manifold  1236  is on each side of the vertical support  1273 . The connector portions of the modular manifold  1236  are positioned on one side of the vertical support  1273  and has connectors extending therefrom for connection with the fluid system. Connector portions of the pipes, such as the portions of the pipes at the connection points, extend from the modular manifold in an arrangement corresponding to an arrangement of the auxiliary components to define a plug-in configuration therebetween such that the connector portions of the pipes are positionable in alignment with the auxiliary components for direct and removable connection therewith. A pump portion of the modular manifold  1236  is positioned on the other side of vertical support  1273 . In this configuration, the modular manifold  1236  may be ‘plugged in’ to the remainder of the fluid system for operation therewith. 
       FIGS. 13.1  and  13 . 2  depict front and rear perspective views, respectively, of a modular manifold  1336 . This modular manifold  1336  may be used, for example, with the configurations of FIGS.  10 . 1 - 11 . 3 . In the configuration shown, the modular manifold includes two pumps  250 . 1 ,  250 . 2  fluidly coupled via pipes  1345  and valves to auxiliary equipment of the fluid system. A flow control valve  1372  (e.g., butterfly valve with pneumatic actuator) is also provided for fluidly coupling to the remainder of the fluid system. 
     As shown in  FIGS. 13.1  and  13 . 2 , the modular manifold  1336  fluidly couples to averaging tank  250  at position  1 , mixing tank  248  at position  2 , displacement tank or auxiliary water/chemical supply  244  at position  3 , to auxiliary mixer  246 . 2  at position  4 , re-circulation to averaging tank  245  or batch mixer tank(s)  252  if required at position  5 , to suction of high pressure pump(s)  254  at position  6 , to batch mixer tank(s)  252  (optional) at position  7 , from batch mixer tank(s)  252  to high pressure pump(s)  254  (optional) at position  8 , from additional mixing tank  248 . 2  for dual mixers option (optional) at position  9 , to auxiliary mixer  246 . 1  for pumper variation B or to additional auxiliary mixer  246 . 2  for dual mixers at position  10 , from batch mixer tank(s)  252  to manifold/mixing pump  250 . 2  at position  11 , from batch mixer tank(s)  252  to maniflold/mixing pump  250 . 1  at position  12 , and to drain  456  at position  13 . Knock-off caps may also be provided for cleaning and inspection as needed. 
     The manifolds herein are provided with various connectors  253  for operative connection to the remainder of the fluid systems, and fluid control devices, such as pumps for driving fluid, valves for selectively diverting fluid, drains for releasing fluid, and/or other such devices. The manifolds may be pre-assembled in the appropriate configuration for operation with the fluid system and for transport and delivery. The manifolds may be operatively connected to a frame, skid and/or other transport device to facilitate installation, lifting, and/or transport of the manifold. 
       FIG. 14  is a method  1400  of providing fluid to a wellsite during well construction. The method  1400  involves ( 1480 ) providing a fluid system about a wellsite, the fluid system including auxiliary components (at least one fluid source, at least one mixer and at least one high pressure pump), and a mobile manifold assembly and/or a modular manifold. The fluid system and mobile manifold assembly may be those described herein. The method continues with ( 1482 ) transporting the modular manifold to the auxiliary components using the mobile frame, ( 1484 ) operatively connecting the connector portions of the modular manifold to the auxiliary components, and ( 1486 ) pumping fluid to the wellbore using the modular manifold. 
     The method may also involve mixing the fluid with the mixer, recirculating fluid between the auxiliary components and the modular manifold, selectively diverting fluid from the modular manifold to a mixing portion, a batch portion and/or a delivery portion of the fluid system, and/or cementing the wellbore using the fluid pumped to the wellbore. The method may be performed in any order and repeated as desired. 
     It should be noted that the valves described and depicted herein may be actuated in a variety of methods, or derivatives thereof. For example: actuation may be in-situ and manually with handles or wheels, remotely via direct pneumatics, remotely and indirectly using electrical solenoids and spools to regulate/control pneumatics (such feature may also enable process control via automated routines written for at least one of the operating scenarios described herein). Moreover, it should also be noted that the pumps may be run in accordance with a variety of methods, or derivatives thereof. For example, running the pumps may comprise drive shafts, electric motors or hydraulic motors. One skilled in the art will recognize that alternative methods can be employed in practicing the present disclosure. 
     Although the present disclosure has been described with reference to exemplary embodiments and implementations thereof, the present disclosure is not to be limited by or to such exemplary embodiments and/or implementations. Rather, the systems and methods of the present disclosure are susceptible to various modifications, variations and/or enhancements without departing from the spirit or scope of the present disclosure. Accordingly, the present disclosure expressly encompasses all such modifications, variations and enhancements within its scope. 
     The terminology and phraseology used herein is solely used for descriptive purposes and should not be construed as limiting in scope. Language such as “including,” “comprising,” “having,” “containing,” or “involving,” and variations thereof, is intended to be broad and encompass the subject matter listed thereafter, equivalents, and additional subject matter not recited. 
     Moreover, in this description the terms “up” and “down”; “upward” and downward”; “upstream” and “downstream”; and other like terms indicating relative positions above or below a given point or element are used in this description to more clearly described some embodiments of the invention. 
     It should be noted that in the development of any such actual embodiment, numerous implementations and specific decisions may be made to achieve the developer&#39;s specific goals, such as compliance with system related and business related constraints, which may vary from one implementation to another. Moreover, it will be appreciated that such a development effort may be complex and time consuming, but may nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure. In addition, the composition used/disclosed herein can also comprise some components other than those cited. 
     Each numerical value herein should be read once as modified by the term “about” (unless already expressly so modified), and then read again as not so modified unless otherwise indicated in context. Also, in the disclosure, it should be understood that a concentration range listed or described as being useful, suitable, or the like, is intended that any and every concentration within the range, including the end points, is to be considered as having been stated. For example, “a range of from 1 to 10” is to be read as indicating each and every possible number along the continuum between about 1 and about 10. Thus, even if specific data points within the range, or even no data points within the range, are explicitly identified or refer to only a few specific, it is to be understood that inventors appreciate and understand that any and all data points within the range are to be considered to have been specified, and that inventors possessed knowledge of the entire range and all points within the range. 
     Although only a few example embodiments have been described in detail above, those skilled in the art will readily appreciate that many modifications are possible in the example embodiments without materially departing from this invention. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the following claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. Thus, although a nail and a screw may not be structural equivalents in that a nail employs a cylindrical surface to secure wooden parts together, whereas a screw employs a helical surface, in the environment of fastening wooden parts, a nail and a screw may be equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. §112, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function. 
     In a given example, the modular manifold may have valves and flowlines/pipes positioned on a frame in various configurations and provided with various connectors to facilitate connection to a mixing portion of a fluid system.