Patent Publication Number: US-2023143726-A1

Title: Integrated fracturing unit

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a nonprovisional application which claims priority from U.S. provisional application No. 63/277,087, filed Nov. 8, 2021, which is incorporated by reference herein in its entirety. 
    
    
     TECHNICAL FIELD/FIELD OF THE DISCLOSURE 
     The present disclosure relates generally to enhanced recovery for wellbores, and specifically to hydraulic fracturing systems. 
     BACKGROUND OF THE DISCLOSURE 
     Industrial pumps are utilized to transfer fluids from one location to another and may be used in a wide variety of applications. For example, in the oil and gas industry, industrial pumps may be utilized for transferring production fluids, drilling mud, wastewater, hydraulic fracturing fluid, or other process fluids. 
     Hydraulic fracturing is a process utilized in oil and gas operations to enhance recovery of minerals from a reservoir within a subterranean formation. More specifically, hydraulic fracturing involves the injection of a pressurized fluid, referred to as “fracturing fluid” into a well in order to open, generate, and/or propagate fractures or cracks within the subterranean formation. The cracks formed by the pressurized fluid increase the volume of the reservoir, which enables the release of additional minerals and improves flow of the minerals from the reservoir to the surface via the well. 
     Fracturing fluid, which is typically a mixture of water, gel, foam, proppant (such as sand), and/or other materials, is injected into the well via hydraulic fracturing equipment. The hydraulic fracturing equipment may include a variety of components, such as material storage tanks, blenders for mixing the fracturing fluid, and pump systems configured to increase the pressure of the fracturing fluid before the fracturing fluid is injected into the well. Traditionally, a well servicing pump system includes a well servicing pump that is driven by a combustion engine, such as a diesel engine. For example, a diesel engine may be operatively connected to a well servicing pump via a geared transmission. Generally, diesel engines usually have a large footprint, generate undesirable noise and vibrations, increase environmental impact, and can be costly to operate. Additionally, driving a well servicing pump with a diesel engine may involve the use of numerous moving parts, which may increase operating and/or maintenance costs of the hydraulic fracturing equipment. 
     SUMMARY 
     The present disclosure provides for an integrated fracturing system. The integrated fracturing system may include a fracturing pump, an electric motor positioned to drive the fracturing pump, a variable frequency drive positioned to provide variable frequency power to the electric motor, a master controller, and a diagnostic sensor. The master controller may be positioned to provide energize and speed commands to the VFD. The integrated fracturing system may include a diagnostic sensor. The diagnostic sensor may be coupled to the electric motor positioned to measure diagnostic data. The diagnostic sensor may be in communication with the master controller. 
     The present disclosure also provides for a method. The method may include providing an integrated fracturing system. The integrated fracturing system may include a fracturing pump, an electric motor positioned to drive the fracturing pump, a variable frequency drive positioned to provide variable frequency power to the electric motor, a master controller, and a diagnostic sensor. The master controller may be positioned to provide energize and speed commands to the VFD. The integrated fracturing system may include a diagnostic sensor. The diagnostic sensor may be positioned to measure diagnostic data. The diagnostic sensor may be in communication with the master controller. The method may include providing diagnostic data from the diagnostic sensor to the master controller. The method may include performing diagnostics with the master controller and not the VFD. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure is best 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    depicts a perspective view of an integrated fracturing system consistent with at least one embodiment of the present disclosure. 
         FIG.  2    depicts a perspective view of the integrated fracturing system of  FIG.  1   . 
         FIG.  3    depicts a top view of the integrated fracturing system of  FIG.  1   . 
         FIG.  4    depicts a side elevation view of the integrated fracturing system of  FIG.  1   . 
         FIG.  5    depicts a rear end elevation view of the integrated fracturing system of  FIG.  1   . 
         FIG.  6    depicts a schematic control diagram of an integrated fracturing unit consistent with at least one embodiment of the present disclosure. 
         FIG.  7    depicts an example of a decision flow tree consistent with at least one embodiment of the present disclosure. 
         FIG.  8    depicts an example of a decision flow tree consistent with at least one embodiment 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 the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. 
       FIGS.  1 - 5    depicts integrated fracturing system  100 . Integrated fracturing system  100  may be used, for example and without limitation, in performing hydraulic fracturing treatments in oil or gas wells. In some embodiments, integrated fracturing system  100  may be transportable as a single unit. In some embodiments, integrated fracturing system  100  may be configured to be road-transportable as a trailer, truck, or part of a trailer or truck. In other embodiments, integrated fracturing system  100  may be configured as a skid. In the embodiments shown in  FIGS.  1 - 5   , integrated fracturing system  100  is configured as a trailer. 
     In some embodiments, integrated fracturing system  100  may include multiple subsystems including, for example and without limitation, pump subsystem  200 , slide-out platform subsystem  300 , variable frequency drive (VFD) subsystem  400 , and transformer subsystem  500 , each of which is further discussed herein below. In some embodiments, each such subsystem may be transported together. In some embodiments, integrated fracturing system  100  may be configured such that the subsystems thereof remain operatively connected. 
     In some embodiments, integrated fracturing system  100  may include substructure assembly  101 . In some embodiments, substructure assembly  101  may be part of a truck or may make up at least part of a trailer. Substructure assembly  101  may provide support for each subsystem of integrated fracturing system  100 , as each such subsystem may couple to substructure assembly  101 . Substructure assembly  101  may include one or more frame rails  103  positioned to support the subsystems of integrated fracturing system  100 . Substructure assembly  101  may further include wheels  105  for use in transporting integrated fracturing system  100 . Substructure assembly  101  may include coupler  107  where substructure assembly  101  is part of a trailer. Coupler  107  may be used, for example, to couple integrated fracturing system  100  to a truck for transportation of integrated fracturing system  100 . In some embodiments, substructure assembly  101  may include gooseneck  109 . Gooseneck  109  may assist with the transportability of integrated fracturing system  100  when integrated fracturing system  100  is coupled to a truck. 
     In some embodiments, substructure assembly  101  may include leveling system  111 . Leveling system  111  may include one or more legs  113  coupled to substructure assembly  101  and positioned to extend from substructure assembly  101  to the ground once integrated fracturing system  100  is transported to the desired location. In some embodiments, legs  113  may be extended or retracted such that substructure assembly  101  and the subsystems of integrated fracturing system  100  are level during operation thereof. In some embodiments, legs  113  may be retractable such that legs  113  do not interfere with the transportation of integrated fracturing system  100 . 
     In some embodiments, substructure assembly  101  may include a cable tray. The cable tray may be positioned between and coupled to frame rails  103  of substructure assembly  101  and may extend from the front of substructure assembly  101  at gooseneck  109  to the rear end of substructure assembly  101 . In some embodiments, the cable tray may extend beneath the subsystems of integrated fracturing system  100  and may be used to house one or more cables and lines including, for example and without limitation, electrical power cables, data or communication cables, hydraulic lines, pneumatic lines, or any other cable or line used in integrated fracturing system  100 . In some embodiments, the cables and lines within the cable tray may remain operatively coupled to the subsystems of integrated fracturing system  100  during transportation such that the need to reconnect each cable or line each time integrated fracturing system  100  is to be put into use is reduced. 
     In some embodiments, the cable tray may include a main power line positioned to receive electrical power from an external power supply with a single connection to integrated fracturing system  100 . In some embodiments, the primary input cable may include a connection at one or both ends of the cable tray such that electrical power may be provided to integrated fracturing system  100  from either the front or rear end of integrated fracturing system  100 . In some embodiments, power supply may be coupled to the primary input cable of integrated fracturing system  100  at a location spaced apart from a hazardous piece of equipment depending on the mode of operation of integrated fracturing system  100 . In some embodiments, the primary input cable may extend to transformer subsystem  500  as further described herein below. 
     In some embodiments, substructure assembly  101  may include additional cable trays. For example and without limitation, substructure assembly  101  may include a cable tray that extends between VFD subsystem  400  and pump subsystem  200  and may support one or more electric cables including power supply cables and communications cables that extend between VFD subsystem  400  and pump subsystem  200 . Such a cable tray may allow for the electrical connections between VFD subsystem  400  and pump subsystem  200  to remain in operative communication during transportation of integrated fracturing system  100 . 
     Integrated fracturing system  100  may include pump subsystem  200 . In some embodiments, pump subsystem  200  may be located at a rear location of integrated fracturing system  100 . In some embodiments, pump subsystem  200  may include fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b . Motors  203   a ,  203   b  may be electrically powered. Pump subsystem  200  may be coupled to frame rails  103 . Fracturing pump  201   a  may be operatively coupled to motor  203   a  and fracturing pump  201   b  may be operatively coupled to motor  203   b.    
     In some embodiments, fracturing pump  201   a  and motor  203   a  and fracturing pump  201   b  and motor  203   b  may be operated independently. The inclusion of multiple fracturing pumps  201   a ,  201   b  and respective motors  203   a ,  203   b  may, for example and without limitation, provide redundancy for operations and may provide dual pumping capability from a single integrated fracturing system  100 . 
     In some embodiments, fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b  may be coupled to fracturing pump skid  205 . Fracturing pump skid  205  may be selectively decoupleable from substructure assembly  101  of integrated fracturing system  100  such that fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b  may be assembled apart from substructure assembly  101 . Such an arrangement may, for example and without limitation, allow for fracturing pump skid  205  to be specifically configured for the specific configuration of fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b , thereby making the process of mounting and aligning fracturing pumps  201   a ,  201   b  and the respective motors  203   a ,  203   b  simpler than an arrangement in which such mounting and alignment were done to substructure assembly  101  directly. Additionally, in some embodiments, the use of such a fracturing pump skid  205  separate from substructure assembly  101  may allow fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b  having different configurations to be used with integrated fracturing system  100  by using different fracturing pump skids  205 . In some embodiments, each such fracturing pump skid  205  may be adapted to be received by substructure assembly  101  of integrated fracturing system  100 . Additionally, by coupling fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b  to frame rails  103  of substructure assembly  101  with fracturing pump skid  205 , fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b  may be removed and replaced with a replacement pump subsystem  200  in the case of failure of any of fracturing pumps  201   a ,  201   b  or motors  203   a ,  203   b.    
     In some embodiments, fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b , may be positioned off the centerline of substructure assembly  101 . In some such embodiments, fracturing pump  201   a  and motor  203   a  may be offset in a first lateral direction and fracturing pump  201   b  and motor  203   b  may be offset in a second lateral direction. In such an arrangement, fracturing pump  201   a  and motor  203   a  may be positioned at least partially alongside fracturing pump  201   b  and motor  203   b . In such an arrangement, the overall length of pump subsystem  200  may be reduced as compared to an arrangement in which fracturing pump  201   a  and motor  203   a  are positioned directly inline with fracturing pump  201   b  and motor  203   b.    
     In some embodiments, fracturing pump  201   a  and motor  203   a  may be arranged in the opposite direction as fracturing pump  201   b  and motor  203   b . For example, in some embodiments, fracturing pump  201   a  and motor  203   a  may be arranged such that fracturing pump  201   a  is in front of motor  203   a , while fracturing pump  201   b  and motor  203   b  are arranged such that fracturing pump  201   b  is behind motor  203   b . In some embodiments, one or more components of fracturing pump  201   a  and motor  203   a  may be at least partially longitudinally aligned with one or more components of fracturing pump  201   b  and motor  203   b . In some such embodiments, where motors  203   a ,  203   b  are less wide than fracturing pumps  201   a ,  201   b , motor  203   a  may be positioned at least partially abeam of motor  203   b , such that the width of pump subsystem  200  may be reduced as compared to an arrangement in which fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b  are positioned entirely abeam. 
     In some embodiments, fracturing pump  201   a  may be operatively coupled to motor  203   a  by shaft assembly  202   a  and fracturing pump  201   b  may be operatively coupled to motor  203   b  by shaft assembly  202   b . In some embodiments, shaft assemblies  202   a ,  202   b  may be narrower than fracturing pumps  201   a ,  201   b  and motors  203   a ,  203   b . In some such embodiments, fracturing pumps  201   a ,  201   b , shaft assemblies  202   a ,  202   b , and motors  203   a ,  203   b  may be arranged such that shaft assembly  202   a  is aligned with motor  203   b  and shaft assembly  202   b  is aligned with motor  203   a . In such an arrangement, the overall width of pump subsystem  200  may be reduced as compared to an arrangement in which fracturing pumps  201   a ,  201   b  or motors  203   a ,  203   b  are positioned directly abreast. 
     In some embodiments, pump subsystem  200  may include motor cooling system  211 . Motor cooling system  211  may include, for example and without limitation, one or more electrically driven fans positioned on each of motors  203   a ,  203   b.    
     In some embodiments, integrated fracturing system  100  may include slide-out platform subsystem  300 . Slide-out platform subsystem  300  may, in some embodiments, be located adjacent to pump subsystem  200 . In such embodiments, slide-out platform subsystem  300  may include movable platforms  301   a ,  301   b , shown in the retracted position in  FIGS.  1 - 5   . Movable platforms  301   a ,  301   b  may be slidably coupled to frame rails  103  of substructure assembly  101  by one or more slide rails  303  as shown in  FIG.  5   . In some embodiments, movable platforms  301   a ,  301   b  may move between a retracted position and an extended position manually. In some embodiments, movable platforms  301   a ,  301   b  may move between a retracted position and an extended position by one or more actuators. In some embodiments, the actuators may be electrically powered. The actuators may include, for example and without limitation, a screw drive, a chain drive, a worm drive, or a linear actuator. Movable platforms  301   a ,  301   b  may each include floor  307 . In some embodiments floor  307  may be formed as a grated floor. 
     In some embodiments, movable platforms  301   a ,  301   b  may each include safety railings  309 . In some embodiments, movable platforms  301   a ,  301   b  may each include ladder assembly  311 . Ladder assembly  311  may include ladder  313  and handrails  315 . Handrails  315  may be rigidly coupled to and may extend upward from floor  307 . In some embodiments, ladder  313  may be pivotably coupled to floor  307  such that ladder  313  may pivot between a raised position and a lowered position. In other embodiments, ladder  313  may be slidingly coupled to handrails  315  such that ladder  313  may slide between the raised and lowered positions. When in the raised position, ladder  313  may be located within the perimeter of floor  307  such that movable platforms  301   a ,  301   b  may be positioned in the retracted position. When in the lowered position, ladder  313  may extend from floor  307  to the ground such that floor  307  of movable platforms  301   a ,  301   b  may be accessible via ladder  313 . In some embodiments, ladder  313  may extend between floor  307  and the ground. In some embodiments, ladder  313  may extend vertically or may extend at an angle to the vertical, such as at an angle between 0° and 60°, 5° and 45°, or 5° and 25° to the vertical. In such an embodiment, use of ladder  313  positioned at an angle to the vertical may be simplified as compared to a vertical ladder. 
     In some embodiments, ladder  313  may be positioned within handrails  315  when ladder  313  is in the raised position. In some embodiments, one or more retaining mechanisms may be positioned in ladder  313  or handrails  315  which may be used to retain ladder  313  in the raised position. For example, in some embodiments, the retaining mechanism may include a shaft, such as for example, a bolt adapted to pass through a hole formed in each of ladder  313  and handrails  315  such that ladder  313  remains in the raised position when the retaining mechanism is positioned therein. In some embodiments, a securing device such as a cotter pin or nut may be used to retain the retaining mechanism in the locked position. 
     In some embodiments, movable platforms  301   a ,  301   b  may each include a safety gate. The safety gate may be positioned to extend across the opening between handrails  315 . The safety gate may be pivotably coupled to handrails  315  or safety railings  309  such that the safety gate pivots only inwardly, thereby preventing or reducing the chances that a user will inadvertently step off of floor  307  in the direction of ladder assembly  311 . 
     When in the retracted position, movable platforms  301   a ,  301   b  may, in some embodiments, remain within the outer perimeter of substructure assembly  101  to facilitate transportation of integrated fracturing system  100 . Movable platforms  301   a ,  301   b  may be extended such that equipment of integrated fracturing system  100  may be more easily accessible. For example and without limitation, where movable platform  301  is located adjacent pump subsystem  200 , access to fracturing pump  201   a  or  201   b  may be facilitated by the extension of the respective movable platform  301   a  or  301   b . Ladder  313  may be lowered to the ground, allowing a user to access floor  307  of movable platform  301   a  or  301   b  and thereby access the respective fracturing pump  201   a  or  201   b  and motor  203   a  or  203   b.    
     In some embodiments, with reference to  FIG.  1   , integrated fracturing system  100  may include VFD subsystem  400 . VFD subsystem  400  may be mechanically coupled to substructure assembly  101 , such as to frame rails  103 . 
     VFD subsystem  400  may include VFD platform  403 , accessible from the ground by one or more ladder assemblies  405 . Each ladder assembly  405  may include ladder  407  and handrails  409 . Handrails  409  may be rigidly coupled to and may extend upward from VFD platform  403 . In some embodiments, ladder  407  may be pivotably coupled to VFD platform  403  such that ladder  407  may pivot between a raised position and a lowered position. In other embodiments, ladder  407  may be slidingly coupled to handrails  409  such that ladder  407  may slide between the raised and lowered positions. When in the raised position, ladder  407  may be located within the perimeter of VFD platform  403 . In some embodiments, ladder  407  may be positioned within handrails  409  when ladder  407  is in the raised position. When in the lowered position, ladder  407  may extend from VFD platform  403  to the ground such that VFD platform  403  may be accessible via ladder  407 . In some embodiments, ladder  407  may extend to the ground at an angle from VFD platform  403 , In such an embodiment, use of ladder  407  may be simplified as compared to a vertical ladder. 
     In some embodiments, VFD subsystem  400  may include VFD enclosure  415 , which may protect VFD  417  from the surrounding environment and may protect users from encountering high voltages within VFD enclosure  415 . VFD enclosure  415  may, in some embodiments, be secured to VFD platform  403  by one or more vibration isolation mounts to, for example and without limitation, provide vibration and motion damping between VFD enclosure  415  and substructure assembly  101  during transportation of integrated fracturing system  100 . Such damping may, without being bound to theory, mitigate the risk of damaging VFD  417  as well as causing damage to substructure assembly  101  due to movement or torsional loading caused by VFD  417  during travel over uneven terrain. 
     VFD  417  may provide power to motors  203   a ,  203   b  and may control the operation of motors  203   a ,  203   b  by, for example and without limitation, controlling the speed and torque of motors  203   a ,  203   b  and thereby the pump rate of fracturing pumps  201   a  or  201   b  by varying the voltage and current supplied to the respective motor  203   a ,  203   b  and by varying the frequency of the power supplied to motor  203   a ,  203   b.    
     VFD  417  may, in some embodiments, be controlled by an operator positioned on VFD platform  403 , may be controlled remotely, or may operate at least partially autonomously in response to predetermined operating parameters. In some embodiments in which VFD  417  is controlled remotely, VFD  417  may be controlled by a central control system used to manage multiple integrated fracturing systems  100  positioned in a wellsite. In some embodiments, VFD subsystem  400  may include a radiator and fan assembly for thermal management of VFD  417 . 
     In some embodiments, VFD subsystem  400  may include a unit control system, which may be accessible from VFD platform  403  of VFD subsystem  400 . In some embodiments, an operator may control one or more aspects of the operation of integrated fracturing system  100  through the unit control system. In some embodiments, for example and without limitation, the unit control system may be operatively coupled to other subsystems of integrated fracturing system  100  through one or more communication cables. 
     In some embodiments, integrated fracturing system  100  may include transformer subsystem  500 . Transformer subsystem  500  may include transformer enclosure  501 . Transformer enclosure  501  may house transformer  503 , may protect transformer  503  from the surrounding environment, and may protect users from the high voltages found within transformer enclosure  501  during operation of transformer  503 . 
     In some embodiments, transformer subsystem  500  may include transformer base  505 . Transformer base  505  may support transformer enclosure  501  and transformer  503 . Transformer base  505  may be coupled to frame rails  103  of substructure assembly  101 . In some embodiments, transformer base  505  may be coupled to substructure assembly  101  via isolation mounts. Isolation mounts may, for example, provide vibration and motion damping between transformer subsystem  500  and substructure assembly  101  during transportation of integrated fracturing system  100 . Such damping may, without being bound to theory, mitigate the risk of damaging transformer  503  as well as causing damage to substructure assembly  101  due to movement or torsional loading caused by transformer subsystem  500  during travel over uneven terrain. In some embodiments, damping may further reduce transmission of vibrations caused by transformer  503  to the rest of integrated fracturing system  100  during operation of transformer  503 . 
     In some embodiments, VFD  417  may be controlled by master controller  551 . Master controller  551  may be positioned on substructure assembly  101 . Master controller  551  may be operatively coupled to VFD  417  such that master controller  551  provides instruction to VFD  417  including, for example and without limitation, commands to energize and control the speed of electric motors  203   a ,  203   b  driven by VFD  417 . Master controller  551  may thereby control fracturing pump  201   a ,  201   b  and thus control the speed and amount of fluid pumped by fracturing pump  201   a ,  201   b  from hydraulic fracturing fluid supply  621  to hydraulic fracturing fluid output  623 . In some embodiments, hydraulic fracturing fluid supply  621  may be coupled to a source of fluid including, for example and without limitation, a reservoir, tank, or other equipment such as blenders. Hydraulic fracturing fluid output  623  may be coupled to a wellbore via a frac tree coupled thereto. 
       FIG.  6    depicts a schematic control diagram of integrated fracturing system  100  consistent with at least one embodiment of the present disclosure. As shown, master controller  551  may be positioned to receive input from an operator as to speed or rate of flow of fracturing pump  201 a,  201   b  at operator input  601 . Master controller  551  may interpret operator input  601  as well as other parameters as further discussed below and output energize and speed commands  603  to VFD  417 . VFD  417  may receive energize and speed commands  603  and provide variable frequency power  605  to motor  203   a ,  203   b . VFD  417  may include one or more power electronics components such as rectifiers, switches, and inverters positioned to convert input power  607  into variable frequency power  605  for motor  203   a ,  203   b . Variable frequency power  605  may be single or multiphase. 
     Based on variable frequency power  605  received by motor  203   a ,  203   b , motor  203   a ,  203   b  may be energized and the rotor thereof is rotated. Each rotor is coupled to fracturing pump  201 a,  201   b  by mechanical coupling  609 . Thus, the rotation of the rotor of each motor  203   a ,  203   b  causes rotation of components of the respective fracturing pump  201   a ,  201   b , thereby providing impetus for the movement of fluid from hydraulic fracturing fluid supply  621  to hydraulic fracturing fluid output  623  and thereby into the wellbore as discussed herein above. 
     In some embodiments, each motor  203   a ,  203   b  may include a speed sensor which may be in communication with VFD  417  to provide motor speed signal  611 . Motor speed signal  611  may be used by VFD  417  to modulate variable frequency power  605  such that the speed of motor  203 a,  203   b  matches the speed commanded by master controller  551  via energize and speed commands  603 . 
     In some embodiments, one or more components of integrated fracturing system  100  may include one or more diagnostic sensors. In such embodiments, the diagnostic sensors may provide diagnostic data to master controller  551 . As shown in  FIG.  6   , fracturing pump  201   a ,  201   b  may provide pump diagnostic data  613 , motor  203   a ,  203   b  may provide motor diagnostic data  615 , and VFD  417  may provide VFD diagnostic data  617  to master controller  551 . For example and without limitation, diagnostic data may include one or more of battery voltage; motor bearing drive-end temperature; motor bearing non-drive-end temperature; coolant pressure; coolant temperature; discharge pressure; discharge rate; fluid end strokes; grease system active; motor RPM; motor feedback hertz; number of plungers; overpressure trip point; plunger diameter; plunger stroke; power end strokes; pump charge pressure; pump efficiency; pump gear ratio; pump hours; pump id; pump lube oil pressure; pump lube oil temperature; pump discharge total; motor RPM request; VFD current DAC; VFD current RPM; VFD drive current percent; VFD overload percent remaining; VFD frequency feedback hertz; VFD maximum RPM; VFD motor current amperes; VFD motor overload percent remaining; VFD motor power kW; VFD motor voltage; VFD speed feedback percent; VFD speed feedback RPM; VFD CDC temperature; VFD IGBT bridge 1 temperature; VFD IGBT bridge 2 temperature; VFD IGBT bridge 3 temperature; VFD rectifier bridge temperature; VFD maximum CDC temperature; VFD active current amperes; VFD reactive current amperes; VFD speed reference percent; VFD torque demand percent; remote watchdog enabled; motor winding A temperature; motor winding B temperature; motor winding C temperature. Sensors may include, for example and without limitation, one or more pressure transducers, temperature transducers, speed sensors, and power measurement devices. As an example, master controller  551  may use motor diagnostic data  615  to provide reliable operation of motor  203   a ,  203   b  and reduce or prevent damage to motor  203   a ,  203   b  during operation thereof 
     Additionally, diagnostic data may be gathered from other system controllers by master controller  551 , allowing master controller  551  to integrate diagnostic data from multiple subsystems of integrated fracturing system  100 , thereby allowing for a more detailed and complete diagnostic system. For example and without limitation, master controller  551  may gather information from one or more of a fan controller; pressure transducers associated with a pump; accelerometers associated with a pump; lube oil pressures and temperature sensors; motor bearing temperature sensors, and motor winding temperature sensors. 
     As shown in  FIG.  6   , diagnostic data is sent to master controller  551  and not to VFD  417 . VFD  417  therefore is not used to perform diagnostics. In some embodiments, diagnostic data gathered by master controller  551  may be used, for example and without limitation, for troubleshooting issues, building predictive models for forensic analysis, optimized performance, managing of health of components, and for generating preventative decision tress for safety and reliability. 
     In some embodiments, master controller  551  may provide alerts to a user or otherwise manage the performance of integrated fracturing system  100  according to one or more alert conditions. For example and without limitation, alert conditions may be based on the monitoring of one or more of motor bearing drive end; motor bearing non-drive end; motor blower; coolant fan motor; coolant level; coolant recirculation motor; coolant pressure; coolant temperature; emergency stop; grease level low; lube oil level; phase A winding temperature; phase B winding temperature; phase C winding temperature; pump charge pressure; pump discharge pressure; pump oil pressure; pump oil temperature; pump speed; shutdown; VFD fault; watchdog local timeout; or watchdog remote timeout. In some embodiments, alerts may be provided as one or more annunciations on one or more displays or other human interface devices. In some embodiments, an alert condition may cause master controller  551  to change the mode of operation or modify the operation of one or more components of integrated fracturing system  100  including, in some instances, the termination of one or more operations of one or more components of integrated fracturing system  100 . 
     For example and without limitation,  FIG.  7    depicts decision flow tree  700  consistent with at least one embodiment of the present disclosure. Once integrated fracturing system  100  is in operation, master controller  551  may receive operator input  701 , and may undertake controller actions ( 701 a-c) to control the operation of subsystems of integrated fracturing system  100  including fracturing pumps  201   a ,  201   b ; VFD  417 ; and other subsystems of integrated fracturing system  100  such as, for example and without limitation, grease system  703  as shown in  FIG.  7   . Master controller  551  may continue to operate and determine whether each such subsystem has reached a desired state ( 705   a - c ). Once such a state has been reached, process variables for each subsystem may be monitored ( 707   a - c ). In the case that one such process variable is out of limits, such as, for example and without limitation, process variables ( 707   a ) relating to fracturing pumps  201   a ,  201   b , master controller  551  may take an action to change the operation of other subsystems of integrated fracturing system  100 , such as controller action  701   b  related to the operation of VFD  417 , and controller action  701   c  related to the operation of grease system  703 . 
     For example and without limitation,  FIG.  8    depicts decision flow tree  800  consistent with at least one embodiment of the present disclosure. Master controller  551  may receive data from multiple subsystems  801 , which may be fed into decision tree/analytics engine  803 . Decision tree/analytics engine  803  may feed prediction data stream  805  to master controller  551  such that master controller  551  may operate subsystems  801  consistent with decision tree/analytics engine  803 . For example, decision tree/analytics engine  803  may be used, as discussed herein above, to manage system health  807 , which may include anomaly detection  809  and maintenance predictions  811 . Similarly, decision tree/analytics engine  803  may be used to optimize performance, shown as system optimization  813 , which may include, for example and without limitation, performance optimization  815 , efficiency  817 , and managing emissions  819 . 
     The foregoing outlines features of several embodiments so that a person of ordinary skill in the art may better understand the aspects of the present disclosure. Such features may be replaced by any one of numerous equivalent alternatives, only some of which are disclosed herein. One of 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 purposes and/or achieving the same advantages of the embodiments introduced herein. One of 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.