This disclosure relates generally to hydraulic fracturing and more particularly to systems and methods for compact modular trailer arrangements for electric powered multi-plunger fracturing pump systems.
With advancements in technology over the past few decades, the ability to reach unconventional sources of hydrocarbons has tremendously increased. Horizontal drilling and hydraulic fracturing are two such ways that new developments in technology have led to hydrocarbon production from previously unreachable shale formations. Hydraulic fracturing (fracturing) operations typically require powering numerous components in order to recover oil and gas resources from the ground. For example, hydraulic fracturing usually includes pumps that inject fracturing fluid down the wellbore, blenders that mix proppant into the fluid, cranes, wireline units, and many other components that all must perform different functions to carry out fracturing operations.
Usually in fracturing systems the fracturing equipment runs on diesel-generated mechanical power or by other internal combustion engines. Such engines may be very powerful, but have certain disadvantages. Diesel is more expensive, is less environmentally friendly, less safe, and heavier to transport than natural gas. For example, heavy diesel engines may require the use of a large amount of heavy equipment, including trailers and trucks, to transport the engines to and from a wellsite. In addition, such engines are not clean, generating large amounts of exhaust and pollutants that may cause environmental hazards, and are extremely loud, among other problems. Onsite refueling, especially during operations, presents increased risks of fuel leaks, fires, and other accidents. The large amounts of diesel fuel needed to power traditional fracturing operations requires constant transportation and delivery by diesel tankers onto the well site, resulting in significant carbon dioxide emissions.
Some systems have tried to eliminate partial reliance on diesel by creating bi-fuel systems. These systems blend natural gas and diesel, but have not been very successful. It is thus desirable that a natural gas powered fracturing system be used in order to improve safety, save costs, and provide benefits to the environment over diesel powered systems. Turbine use is well known as a power source, but is not typically employed for powering fracturing operations.
Though less expensive to operate, safer, and more environmentally friendly, turbine generators come with their own limitations and difficulties as well. As is well known, turbines generally operate more efficiently at higher loads. Many power plants or industrial plants steadily operate turbines at 98% to 99% of their maximum potential to achieve the greatest efficiency and maintain this level of use without significant difficulty. This is due in part to these plants having a steady power demand that either does not fluctuate (i.e., constant power demand), or having sufficient warning if a load will change (e.g., when shutting don or starting up a factory process).
Space is at a premium at a fracturing site, where different vendors are often working simultaneously to prepare for a fracturing operation. As a result, utilizing systems that have large footprints may be undesirable. However, pressure pumpers still need to be able to provide sufficient pumping capacity in order to complete fracturing jobs.
The present disclosure is directed to a method and system for a modular switchgear system and power distribution for electric oilfield equipment.
In an embodiment, a hydraulic fracturing system includes a support structure having a first area at a first height and a second area at a second height, the first and second areas adjacent one another. The system also includes an electric powered, multi-plunger pump with an odd number of plungers, arranged in the first area, the electric powered pump coupled to a well, via outlet piping, and powered by at least one electric motor, also arranged in the first area. The system further includes a variable frequency drive (VFD), arranged in the second area, connected to the at least one electric motor, the WE) configured to control at least a speed of the at least one electric motor. The system also includes a transformer, arranged in the second area, the transformer positioned within an enclosure with the VFD, the transformer distributing power to the electric pump.
In an embodiment, a hydraulic fracturing system includes an electric powered, multi-plunger pump, arranged on a support structure, the electric powered multi-plunger pump powered by at least one electric motor. The system also includes a variable frequency drive (VFD), arranged on the support structure, connected to the at least one electric motor to control a speed of the at least one electric motor, the variable VFD positioned separate from the electric powered, multi-plunger pump and within an enclosure. The system further includes a transformer, arranged on the support structure, distributing power to the electric powered, multi-plunger pump, the power being received from the least one generator at a voltage higher than an operating voltage of the electric powered pump, the transformer positioned within the enclosure. The electric powered, multi-plunger pump includes an odd number of plungers and provides a first pump output greater than or equal to a second pump output associated with two quintuplex pumps.
In an embodiment, a pumping unit may include a multi-plunger hydraulic fracturing pump with an odd number of plungers greater than 5 (e.g., 7, 9, 11, etc.). The odd number of plungers may produce less kinematic flow ripple than a standard quintuplex pump, which is the most common type of pump in the oil service industry.
In an embodiment, a pumping unit may include a seven plunger (septuplex) hydraulic fracturing pump. The septuplex pump may produce less kinematic flow ripple than the standard quintuplex, which is the most common type of pump in the oil service industry.
In various embodiments, one or more pumping units that include a septuplex pump may reduce the number of units required for hydraulic fracturing. By way of example only, 8 septuplex (7 plungers) pumps with 5″ plungers and 10″ stroke length can do the same work as 16 quintuplex pumps with 4.5″ plungers and 8″ stroke length (which is currently the most common pump in the industry). Accordingly, the septuplex pump with bigger plunger bores and longer stroke length than the common quintuplex pump can displace roughly 2 quintuplex pump units for every single septuplex unit.
Embodiments of the present disclosure also provide improved mobility and smaller footprints due to significantly short trailer length than common quintuplex hydraulic fracturing pump units.
Furthermore, various embodiments may arrange a transformer and variable frequency drive (VFD) in the same enclosure to minimize space requirements. Additionally, a VFD liquid cooling system may be packaged in the transformer enclosure.
Embodiments further include ladder access to gooseneck area for servicing or troubleshooting the transformer or VFD that is away from the “red zone” area of the high pressure pump discharge. Moreover, a VFD and a human-machine interface (HMI) screen may be arranged on the same service platform to allow for maintenance to work on the VFD while also seeing pump controls from the same place. Furthermore, a Motor Control Center (MCC) may also be positioned on the gooseneck of the trailer with ladder access from the ground.
Embodiments further include handrails incorporated on the platform to allow for easy maintenance.
Some of the features and benefits of the present disclosure having been stated, others will become apparent as the description proceeds when taken in conjunction with the accompanying drawings, in which:
While the disclosure will be described in connection with the preferred embodiments, it will be understood that it is not intended to limit the disclosure to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents, as may be included within the spirit and scope of the disclosure as defined by the appended claims.
The method and system of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings in which embodiments are shown. The method and system of the present disclosure may be in many different forms and should not be construed as limited to the illustrated embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey its scope to those skilled in the art. Like numbers refer to like elements throughout. In an embodiment, usage of the terms “about” or “approximately” include +/−5% of the cited magnitude. In an embodiment, usage of the term “substantially” includes +/−5% of the cited magnitude.
It is to be further understood that the scope of the present disclosure is not limited to the exact details of construction, operation, exact materials, or embodiments shown and described, as modifications and equivalents will be apparent to one skilled in the art. In the drawings and specification, there have been disclosed illustrative embodiments and, although specific terms are employed, they are used in a generic and descriptive sense only and not for the purpose of limitation.
When introducing elements of various embodiments of the present disclosure, the articles “a”, “an”, “the”, and “said” are intended to mean that there are one or more of the elements. The terms “comprising”, “including”, and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Any examples of operating parameters and/or environmental conditions are not exclusive of other parameters/conditions of the disclosed embodiments. Additionally, it should be understood that references to “one embodiment”, “an embodiment”, “certain embodiments”, or “other embodiments” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, reference to terms such as “above”, “below”, “upper”, “lower”, “side”, “front”, “back”, or other terms regarding orientation or direction are made with reference to the illustrated embodiments and are not intended to be limiting or exclude other orientations or directions. Additionally, recitations of steps of a method should be understood as being capable of being performed in any order unless specifically stated otherwise. Furthermore, the steps may be performed in series or in parallel unless specifically stated otherwise. Additionally, recitation of pumps or motors having a certain output or voltage may refer to a rated output or a rated voltage and not necessarily and actual operating parameter.
Embodiments of the present disclosure describe a pumping unit that may include a multi-plunger hydraulic fracturing pump, such as a septuplex pump, to facilitate larger pumping capacity while also reducing a size of a footprint at a fracturing site. In various embodiments, the septuplex pump may be utilized to replace smaller pumps, such as quintuplex pumps. Additionally, the septuplex pump may include larger bores and/or longer stroke lengths. By way of example, the septuplex pump may be configured to displace approximately 2 quintuplex pump units for every single septuplex pump units, which may decrease the overall occupied footprint at the well site, among other benefits. In embodiments where even more plungers are used (e.g., 9, 11, etc.), even more quintuplex pump units can be displaced. The septuplex pump, or other multi-plunger pumps, may be part of the pumping unit which may also include control or monitoring components, such as a motor control center (MCC) or a variable frequency drive (VFD). In various embodiments, the septuplex pump is electrically powered, for example via a generator arranged at a fracturing site.
After being discharged from the pump system 16, a distribution system 30, such as a missile, receives the slurry solution for injection into the wellhead 18. The distribution system 30 consolidates the slurry solution from each of the pump trucks 14 and includes discharge piping 32 coupled to the wellhead 18. In this manner, pressurized solution for hydraulic fracturing may be injected into the wellhead 18.
In the illustrated embodiment, one or more sensors 34, 36 are arranged throughout the hydraulic fracturing system 10 to measure various properties related to fluid flow, vibration, and the like.
A power generation system 40 is shown, which may include turbines, generators, switchgears, transformers, and the like. In various embodiments, the power generation system 40 provides energy for one or more operations at the well site. It should be appreciated that while various embodiments of the present disclosure may describe electric motors powering the pump trucks 14, in embodiments, electrical generation can be supplied by various different options, as well as hybrid options. Hybrid options may include two or more of the following electric generation options: Gas turbine generators with fuel supplied by field gas, CNG, and/or LNG, diesel turbine generators, diesel engine generators, natural gas engine generators, batteries, electrical grids, and the like. Moreover, these electric sources may include a single source type unit or multiple units. For example, there may be one gas turbine generator, two gas turbines generators, two gas turbine generators coupled with one diesel engine generator, and various other configurations.
In various embodiments, equipment at the well site may utilize 3 phase, 60 Hz, 690V electrical power. However, it should be appreciated that in other embodiments different power specifications may be utilized, such as 4160V or at different frequencies, such as 50 Hz. Accordingly, discussions herein with a particular type of power specification should not be interpreted as limited only to the particularly discussed specification unless otherwise explicitly stated. Furthermore, systems described herein are designed for use in outdoor, oilfield conditions with fluctuations in temperature and weather, such as intense sunlight, wind, rain, snow, dust, and the like. In embodiments, the components are designed in accordance with various industry standards, such as NEMA, ANSI, and NFPA.
The illustrated trailer 202 includes a slide out platform 206, which may be extendable away from a trailer body 208 in a direction substantially perpendicular to a trailer axis 210. In other words, the slide out platform 206 extends outwardly relative to a plane of the page. The slide out platform 206 may be positioned on the illustrated passenger side, on the opposite driver side, or both. The slide out platform 206 may enable maintenance and service of various components of the pumping unit 200. By way of example only, the slide out platform 206 may provide an increased surface area for maintenance personnel to operate. The slide out platform 206 may be aligned with various components, such as a pump 212 (e.g., a multi-plunger electric powered pump), motor 214, blowers, and the like. Furthermore, various embodiments may include multiple slide out platforms 206, such as one aligned with an enclosure 216 for an HMI 218, VFD 220, transformer 222, and the like.
In this example, the illustrated trailer 202 may be referred to as a gooseneck trailer and includes a first height 224 and a second height 226. In this example, the second height 226 is greater than the first height 224. Different segments or portions of the illustrated embodiment are positioned at different locations along the trailer 202. For example, in this example, the motor 214 and pump 212 are at a first area 228 that corresponds to the first height 224 and the enclosure 216 and associated components are at a second area 230 that corresponds to the second height 226. It should be appreciated that this configuration may be reversed in other embodiments such that the motor and pump combination are at the second area 230.
Additional components are also illustrated in
In this example, the trailer 202 has a trailer length 238 extending from a front end 240 to a back end 242. It should be appreciated that “front” and “back” are used illustratively, and in this instance the front end 240 refers to the second area 230 where the trailer 202 would be coupled to a prime mover and the back refers to the first area 228. In various embodiments, the trailer length 238 may be substantially equal to a trailer length for a unit that includes a single quintuplex or two quintuplex pumps. As a result, utilizing embodiments of multi-plunger pumping units, such as the illustrated unit that includes a septuplex pump, may provide an increased pumping capacity while occupying a similar or smaller footprint.
In certain embodiments, the access platform 400 includes a cable routing system 402 extending below a grating 404 which enables routing and various cables, such as cables from the generator or the like providing power to the transformer. The routing system 402 may include one or more channels that receive and direct the cables to a desired location. The grating 404 may be removable and/or pivotable to provide ready access to the one or more channels. Additionally, as shown, ingress and egress is provided by ladders or steps 406 provided on both sides of the platform 400.
As shown in
As noted here, embodiments of the present disclosure illustrate the pumping unit 200 that includes the slide out platform for service of the pump or motor blowers, a coupling, an MIL HMI-VFD, VFD/transformer enclosure, service platform for VFD/transformer, suction piping, and high pressure discharge piping. The pumping unit 200 may include a multi-plunger pump, such as a septuplex pump, motor, coupling, HMI, HMI-VFD platform, VFD/Transformer enclosure, service platform for VFD/Transformer, septuplex pump lube oil cooler, and pump plunger lube system.
In various embodiments, as noted above, the length 238 of the trailer 202 may be less than other pump units that may include multiple pumps arranged along the bed. For example, a trailer that includes two or more pumps may be longer than the trailer 202, which may be difficult to transport between well sites and also difficult to stage at the well site. However, other trailers may include multiple pumps in order to provide sufficient pumping capacity. As described, embodiments of the present disclosure may utilize the septuplex pump, or other pumps such as pumps including 9 plungers, 11 plungers, etc., with a bigger plunger bores and a longer stroke length to provide sufficient pumping capacity that may be substantially equal to two quintuplex pumps. Accordingly, the footprint at the well site may be decreased while also providing trailers that may be easier to transport and maneuver. Furthermore, it should be appreciated that while trailers are being referenced and illustrated, embodiments are not limited to trailers. For example, the trailer may be replaced with a skid, which may be loaded on a flat bed or the like, and may be movable to a desired location at the well site. In such a configuration, the skid may have a skid length that may also be shorter than a trailer length or skid length where multiple quintuplex pipes are used.
In embodiments, the pumping unit includes the single electric powered multi-plunger fracturing trailer. In this example, the pump is a septuplex pump that is capable of pumping inhibited acid and other proppant laden stimulation fluids and is further remotely operated from a control unit. The single electric motor is capable of delivering approximately 4000 BHP or approximately 3800 HHP based on efficiency losses, pump limitations, and varying conditions at time of operations. However, this configuration is for example purposes only and different sizes of motors and/or pumps may be utilized. Moreover, while embodiments may be described with respect to the trailer, other configurations such as skid-mounted or truck mounted systems may also be utilized with embodiments of the present disclosure that may use similar pumps.
Embodiments may be configured to reduce vibration during operations. For example, the pump unit may be configured such that while delivering full horsepower without exceeding the pump ratings, there are no components and/or substantially no components that will vibrate with excessive amplitudes in resonance with the forcing vibrations of the electric motor or pump. Also there are no and/or substantially no excessive rotational vibrations of electric motor or pump due to transmitted torque and the flexibility of the trailer and mounting systems. Due to the lower kinematic flow ripple of a septuplex pump versus a quintuplex, the septuplex will operate more smoothly. This may also be true for other pump configurations, such as pumps that include 9 plungers, 11 plungers, etc. Accordingly, there may be a reduced need to include dampening materials along the trailer and/or skid. Additionally, the reduced vibrations may enable components of the pumping unit to be positioned closer together, thereby further reducing the length of the trailer and providing a compact system.
In the illustrated embodiment, the VFD system is installed on the trailer and is packaged inside the transformer enclosure 216. The unit is capable of operating during prolonged pumping operations. The unit will typically be capable of operating in temperature ranges of approximately −40 C to 55 C, for example, but other ranges may also be utilized within embodiments of the present disclosure. The VFD may also be utilized to acquire motor diagnostics and may, in embodiments, provide one or more control signals to the motor. For example, the motor may receive a transmitted signal from the VFD to increase or decrease a rotational speed of the motor.
The illustrated trailer system is a heavy-duty single drop trailer in the embodiments shown in
Various embodiments may also include other features that facilitate loading, unloading, transportation, and storage of the trailer. By way of example, embodiments that include the trailer may include an approximately 52″ kingpin setting (e.g., a 52″ distance from the center of the fifth wheel connection to the center of the rear axle group). As will be appreciated, this distance may affect the turning radius of the wheels, with a longer kingpin setting providing a larger turning radius. The illustrated landing legs may be rated for approximately 160,000 pounds, thereby providing sufficient load capacity to enable operation of pumping unit. For example, the load capacity may be sufficient to enable the pumping units to be hauled to the well site, staged via the landing legs, and then operated using the landing legs, which reduces the presence of additional equipment, such as the trucks for hauling the pumping units, at the site. Additionally, the trailers may include an air ride suspension to provide a smoother, consistent ride quality. This system may also be coupled with ABS brakes and a heavy-duty tri or quad axle configuration. Various embodiments may also include 11.00 R 22.5 radial tires and a 2″ SAE king pin with a rub plate. Furthermore, light mounted stop/turn clearance and mud flaps may be provided along with a rear bumper having a tow hook and additional running lights to enable highway use. The trailer may also include front and rear fenders.
As noted above, there is the motor coupling 232 arranged between the pump 212 and the motor 214 to transmit energy to the pump 212. In the illustrated embodiment, the coupling utilized for connecting electric motor to the pump does not exceed the manufacturer's recommended maximum angle under normal operation condition. The coupling includes a guard with an access panel to enable the pump to be turned without guard removal.
In various embodiments, a septuplex pump is utilized to pump fluids at a high pressure into a wellbore. However, as noted above, septuplex is provided as an example only. It should be appreciated that various different pumps, having a variety of different operating conditions and features, may be utilized. For example, the pumps may operate at a variety of different voltage inputs, with different voltage requirements, with different power inputs, and the like. By way of example only, the septuplex pump, or other pumps, may include stainless steel or alloy steel fluid ends. Further features may include a main discharge connection, bleed connection, center gauge connection, and zoomie suction manifold. In certain embodiments, the stroke length for the pump is approximately 10″. However, it should be appreciated that this length may be adjusted and particularly selected based on a desired performance. As stroke length increases, pump flow rate may also increase. Additionally, in embodiments, the plunger size is approximately 5.0″. However, it should be appreciated that this size may be adjusted and particularly selected based on a desired performance.
In embodiments, a double connection suction manifold extends into a zoomie style manifold that is bolted directly on the pump's fluid end. The double connections may be winged union connections and include two butterfly valves. A removable pulsation dampener is installed in the inlet side, in embodiments. The pump's rear discharge port is connected to the discharge manifold via 3″ sub-connections. A 2″ connection is installed on the pump center gauge opening and is utilized for the unit pressure transducer. In embodiments, the rear discharge manifold extends to the back of the trailer.
An electronically powered plunger lube pump system with pumping elements may also be installed to provide lubricant to the plungers. This system may be equipped with a pump speed input to adjust lubrication timing based on speed. However, other features may also be integrated, such as various instrumentation systems to monitor lube reservoir levels, pressures, and the like.
The power end of the pumps is lubricated by a hydraulic pump driven by an auxiliary electric motor. The power end lubrication system includes components such as relief valve, filters, instrumentation, plumbing, and lube oil reservoir. In various embodiments, the system further includes a transformer system comprised of a 4,000 kVA step down transformer and associated electrical components mounted on the trailer.
Embodiments further includes a transformer enclosure structure 216 constructed and braced for portable movement that has, by way of example only, features including a heavy-duty construction to enable movement and transportation of the trailer without disassembly of the enclosure 216. As an example, the construction may include cross-bracing and the like to provide improved strength and stability. Furthermore, the enclosure 216 may include a copper ground bus, NEMA 3R outdoor ventilation, and an ANSI 61 paint finish.
The enclosure 216 may house the transformer 222. In various embodiments, the transformer corresponds to a 4,000 kVA step down transformer. The transformer may be 3-phase transformer operable at 60 Hz with an 80/80 C rise, and may use either ambient air (AA) or forced air (HA) for heat removal. The transformer may be manufactured with 7.0 percent impedance with an error range within an ANSI standard tolerance with a phase relation Dyn 1.
The transformer may be a high voltage 13.8 kV delta having features including, but not limited to, 95 KV basic insulation level (BIL), taps, and a copper conductor. The transformer may also include a low voltage 600Y/346 with a 30 DV BIL, taps, and a copper conduction. Various embodiments also include application, rectifier duty, 6 pulse along with a core/coil with a high voltage (HV) to low voltage (LV) electrostatic shield with a K-factor rating. Embodiments may enable monitoring of control power and temperature. Furthermore, the transformer may include interconnect cables from a switchgear to the VFD. The cables may be 545 DLO cables installed to connect the transformer system to the VFD.
The VFD system 220 may be particularly selected to meet the electrical AC drive requirements for electric frac trailers that utilize 3 phase, 60 Hz, 690 volt electrical power sources. The system may also be built in strict accordance with NEMA, ANSI, and NFPA regulations. Additionally, design elements may meet the harsh environmental conditions typically found in oilfields. In certain embodiments, the VFD includes a 650V motor voltage with a drive current of approximately 2429 A. The VFD may have an overload rating of approximately 100% for 60 seconds and a supply voltage of approximately 690 V, 6 pulse. The supply frequency may be 60 Hz and the VFD may also include inverter modules and a cooling system that may utilize water/glycol as the cooling fluid. However, in certain embodiments, the VFD may be a 12 or 24 pulse drive.
Further embodiments may include drives having 2500 A circuit breakers with UDR trip coils and input line reactors. Semiconductor fuses with blown-fuse switches may also be incorporated. Control components may also be utilized to enable remote operation of various components of the pumping unit. Additionally, liquid cooled rectifier, 3 inverter IGBT modules, and 3 SMPS modules may also be incorporated into the system. Various configurations may include shielded ribbon cables and a digital controller with parameter based operations and I/O board. A door-mounted HMI may also be used for setup, monitoring, and diagnostics. Additional features may also include a MV 4000 I/O panel, control power transformer, a 24 V power supply, and relays, indicating lights, and emergency stop push buttons.
The VFD may also incorporate liquid cooling, as described above, that may include welded stainless steel piping coolant headers with hose connections to the modules. Stainless steel piping is used for VFD module headers. Each module is connected to the supply and return headers with a three-quarter inch hose and isolation valve, in an embodiment.
The VFD enclosure of the illustrated embodiment, but which may also be integrated with or replaced by other configurations, is an IP66 enclosure that includes two internal heat exchangers for removing heat form the air inside of the drive enclosure. Additionally, four frames are supplied in the enclosure for power cabling, control cables, and piping. Furthermore, a rain shield which extends out over the service platform to protect the components from rain while being serviced. The unit further includes has a dry type 3 phase, 60 Hz, power distribution transformer with 690 V primary, and 240/120 V secondary with taps.
The power control enclosure, which may be incorporated into or be part of the enclosure 216, is an outdoor weather-proof enclosure. The structure is constructed and braced for portable movement and includes access panels, external off unit connections wired to plug-in connectors accessible from outside, primed and finished painted inside and out, LED external lighting, cooling provided via liquid cooled radiator, and in embodiments the frac pump motor is hard wired on the unit.
In embodiments, the MCC and distribution panel is a 690V power distribution panel/MCC that is fed by a circuit breaker independent from the VFD circuits. By way of example, the MCC may be a single MCC that is seismic zone 4. The MCC may include a 400 A main bus with a rating of approximately 42,000 AIC, 60 Hz, and be 3 phase, 3 wire.
In embodiments, there are four size 1 full voltage non-reversing starters of 10 HP with hands off auto switch. In further embodiments, there are two size 2 full voltage non-reversing starters of 25 HP with hands off auto switch. Additionally, there is one lighting panel, 150 A, with circuit breakers as required.
As noted above, various instrumentation systems may also be included in order to monitor various aspects of the system. For example, supplied and installed on each of the pump discharge unit may be a pressure transducer. In an example, a 0-15,000 PSI pressure transducer with hammer union connections may be utilized, but other connections and pressure transducers may be used. The transducers are installed with a protective guard. Moreover, there may be a single touchscreen display for local pump control. Furthermore, the unit comes installed with either Ethernet communications or RS-485 serial, thereby facilitating remote operation and data transmission. It may also be equipped with wireless communications to sensors in lieu of cabled communication and sensor connections.
Various additional components of the instrumentation system and support systems may include an access hatch on the coupling guard, cable gland protection, check valve bracket support, and spools for the frac cables. Furthermore, various embodiments may also incorporate step grip tape on the handrails and ladder, grounding for the trailer, ladder/stair access with handrails, a land gear crank, an oil radiator bracket, and a power end tank temp sensor. Furthermore, configurations may also provide a fire extinguisher along the trailer.
As noted above, the slide out platform 206 may be incorporated for work on the pump, motor, and motor cooling blowers. In various configurations, the slide out platform 206 may also include a safety hinged door. Embodiments may also include VFD over pressure trip wiring which can bypass the normal S-curve ramp down used to increase electrical and mechanical component longevity to instantly stop the electric motor and associated pump. Furthermore, the VFD and associated control system can have wireless communication capabilities. Additionally, Victaulic™ clamps may be used on the suction side piping of the pump. In certain configurations, a transformer louver design may include a large metal mesh filter to prevent dust/dirt intrusion. Additionally, load shedding may be incorporated via intelligent pump control throttle control and other load responses.
As described, in various embodiments the system may be powered by an onsite generator, such as a turbine generator. However, it should be appreciated that various power generation operations are available, including any one or more, alone or in combination, of the following: one or more turbine generators, one or more diesel generators, one or more natural gas generators, grid power, any other electrical source, or a combination thereof.
Furthermore, as described, in embodiments various specifications are provided for illustrated purposes and are not intended to restrict or otherwise narrow the scope of the pending disclosure. For example, various other combinations and features of the above may be utilized. For example, the multi-plunger pump can have any odd numbers of plungers greater than 5 (e.g., 7, 9, 11, etc.). In various embodiments, the greater the odd number, the less kinematic ripple will exist. Additionally, the stroke length of the pump can be 8″ or more. Furthermore, the pump unit can be on a trailer, skid, body load, or any other platform. Additionally, there can be multiple frac pump units. Moreover, there can be diesel pumps as well as electric pumps (hybrid fleet). Additionally, there can also be an intensifier pump connected hydraulically to the pumps. Additionally, one or more pumps can be used to pump down a tool into the well instead of doing pressure pumping. Furthermore, voltages may be different. Also, the components described can be separated and put on separate platforms that may themselves be on a trailer, skid, body load, or other platform.
Furthermore, alternative configurations may also include the secondary windings on the transformer being tapped at 690V, 600V, 480V, and 240/120V, Additionally, the windings on the transformer can have additional taps for +/−2.5%, 5%, 7.5%, and 10% to adjust the secondary voltage. This is used to combat voltage drop due to long range power transmission. Moreover, the power cables feeding the transformer can be jacketed 3 phase cables with imbedded ground and ground check conductors, or they can be single conductor cables with one or more conductors required per phase. Also, primary transformer voltage can be 25 KV, 15 KV, 13.8 KV, 4160V, or 2000V. In various embodiments, the transformer can act as a step up transformer, step down transformer, or as an isolation transformer with a 1:1 primary to secondary voltage ratio. Additionally, the transformer can be wye-wye, wye-delta, delta-delta, or delta-wye configuration. In certain embodiments, an electric soft starter could also be used in place of a VFD for the primary frac motor. Further configurations may include VFD could be up to 5000 BHP and the motor could be rated to up to 5000 BHP. Additionally, the fluid pump could be rated for up to 5000 HHP. Moreover, the VFD can be air cooled instead of liquid cooled. Moreover, the VFD can use a combination of both air cooling and liquid cooling. Also, the transformer and VFD enclosures can have a positive pressure system to keep dust out. The transformer can use liquid or air cooling. Moreover, the VFD can be packaged separately from the transformer enclosure and the MCC can be packaged separately from the VFD and/or transformer enclosure.
The present disclosure described herein, therefore, is well adapted to carry out the objects and attain the ends and advantages mentioned, as well as others inherent therein. While a presently preferred embodiment of the disclosure has been given for purposes of disclosure, numerous changes exist in the details of procedures for accomplishing the desired results. These and other similar modifications will readily suggest themselves to those skilled in the art, and are intended to be encompassed within the spirit of the present disclosure disclosed herein and the scope of the appended claims.
This application is a continuation of U.S. patent application Ser. No. 17/060,647 filed Oct. 1, 2020 titled “ELECTRIC POWERED HYDRAULIC FRACTURING PUMP SYSTEM WITH SINGLE ELECTRIC POWERED MULTI-PLUNGER FRACTURING PUMP,” now U.S. Pat. No. 11,459,863 issued on Oct. 4, 2022, which claims priority to and the benefit of U.S. Provisional Application No. 62/910,163 filed Oct. 3, 2019 titled “ELECTRIC POWERED HYDRAULIC FRACTURING PUMP SYSTEM WITH SINGLE ELECTRIC SEPTUPLEX FRACTURING PUMP,” the full disclosures of which are hereby incorporated herein by reference in their entirety for all purposes.
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