US20210381358A1 - Drive equipment and methods for mobile fracturing transportation platforms - Google Patents
Drive equipment and methods for mobile fracturing transportation platforms Download PDFInfo
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- US20210381358A1 US20210381358A1 US17/377,884 US202117377884A US2021381358A1 US 20210381358 A1 US20210381358 A1 US 20210381358A1 US 202117377884 A US202117377884 A US 202117377884A US 2021381358 A1 US2021381358 A1 US 2021381358A1
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- Prior art keywords
- mobile power
- pump
- power unit
- electrical generator
- electrical
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/36—Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2607—Surface equipment specially adapted for fracturing operations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
Definitions
- the application generally relates to mobile power units and, more specifically, drive equipment and methods for usage and installation on mobile fracturing transportation platforms.
- Conventional hydraulic fracturing horsepower units often utilize diesel reciprocating engines to drive positive displacement reciprocating pumps. These pumps generally form a part of a fracturing fluid system which often includes auxiliary equipment such as blenders, hydration, and chemical pumps. This auxiliary equipment is commonly referred to as backside equipment and may be powered by diesel reciprocating deck engines or small mobile diesel generators.
- the fracturing industry has been making strides to reduce emissions and footprint. Specifically, the fracturing industry has been making strides to reach government mandated tier 4 emissions standards, namely a government mandated reduction in harmful exhaust gases for diesel powered equipment.
- One way the fracturing industry is moving towards tier 4 emissions is to replace the diesel reciprocating engines with turbine engines that are fueled with natural gas to directly drive hydraulic fracturing pumps. This allows fracturing horsepower units to reach tier 4 emission standards.
- the backside equipment remains driven by engines or generators that struggle with meeting or otherwise do not meet tier 4 emission standards.
- the reciprocating engines on the auxiliary equipment may include a transmission and gearbox inline to power a pump. These added parts may add another mode of failure and further increase maintenance spending.
- One method that has been used for achieving tier 4 emissions standards for the backside equipment is to convert the backside equipment to an electrical fracturing fleet.
- These electrical fracturing fleets generally use a standalone gas turbine engine generator trailer, or other transportation platform as understood by those skilled in the art, to produce electrical power that is distributed through electrical switch gear to drive electrical motors directly coupled to the horsepower units. These electrical motors may be controlled with a high efficiency, high power factor active front end drive (AFE) or variable frequency drive.
- AFE active front end drive
- the standalone gas turbine engine generator trailer also may be rigged into the backside equipment to power the backside equipment.
- Applicant has recognized that using an electrical fracturing fleet with a dedicated turbine generator may not always be feasible or economical.
- electrical generators are commonly mounted on skids which may restrict mobility and requires extensive rig up procedures.
- power transfer may not always be efficient depending on cable lengths and motor efficiencies.
- weather conditions also play a factor as the fracturing service may be supplied in a wide range of weather conditions which may affect service. For example, high temperature conditions may require different cooling packages since generators start losing efficiency at higher temperatures. During high temperature conditions resistance in generators decreases causing lower efficiencies, if this effect is too high, running an electrical generator may no longer be economical. As such it is not always beneficial to have a dedicated generator.
- Applicant still further has recognized that another drawback of a dedicated generator is the upfront engineering and cost to produce the unit.
- the generators may require extensive engineering hours along with different components and parts.
- the benefit of having a turbine driven fracturing pump that may be configured into an electrical generator provides flexibility and adaptability and may save costs by utilizing similar parts and components.
- the backside equipment such as the diesel deck engines, gearboxes, and transmissions may be removed, and instead, backside equipment, such as centrifugal or other types of pumps, may be powered with higher reliability electric pumps.
- backside equipment such as centrifugal or other types of pumps
- One of the most common modes of failure with this backside equipment is hydraulic leaks or failures.
- With an electric motor the need for hydraulic circuits to power the backside equipment may be removed.
- converting the backside equipment to be driven by electrical motors may also increase reliability of the backside equipment and, thus, increase uptime or reduce maintenance costs.
- having electric motors connected to or coupled to pumps, as opposed to hydraulic motors, may yield more efficiency in an electric fleet arrangement, and this, in turn, may result in an improvement in running costs and a reduction in heat rejection which removes need, in some instances, for high air to oil cooler systems, as will be understood by those skilled in the art.
- the natural gas turbine fleets may be converted to be completely electric.
- the natural gas turbine fleets may remove the tier 4 diesel deck engines on the fracturing pumps that often are used to start the turbines and run the on-board auxiliary equipment. This may reduce costs as tier 4 diesel deck engines may be expensive.
- this application is directed to embodiments of high pressure pumps and power generators that readily are installable on mobile fracturing transportation platforms, such as trailers, and that may include a dual fuel, dual shaft turbine engine mounted to the mobile fracturing trailer selectively to drive either the high pressure pumps or the power generators when installed on the mobile fracturing trailer.
- a mobile power unit includes a gas turbine engine, a drive shaft, a reduction gearbox, and a transportation platform.
- the gas turbine engine includes an engine output shaft that rotates to provide energy from the gas turbine engine.
- the reduction gearbox is disposed between the engine output shaft and the drive shaft such that the speed of rotation of the engine output shaft to a speed of rotation of the drive shaft is reduced.
- the reduction gearbox may have a ratio in a range of 5:1 to 20:1.
- the transportation platform includes a drive equipment receiver that is configured to receive drive equipment therein such that the drive equipment is positioned to be connected to the drive shaft.
- the gas turbine engine is mounted to the transportation platform so that the reduction gearbox and the drive shaft are attached to the transportation platform.
- the transportation platform having a first configuration when a pump is installed in the drive equipment receiver such that the pump is driven by the gas turbine engine.
- the pump connected to the drive shaft when the pump is installed in the drive equipment receiver such that the pump is configured to provide high pressure fluid when driven by the gas turbine engine.
- the transportation platform having a second configuration when an electrical generator is installed in the drive equipment receiver such that the electrical generator is driven by the gas turbine engine.
- the electrical generator being connected to the drive shaft and configured to provide electrical power when driven by the gas turbine engine.
- the reduction gearbox may have a ratio of 11:1.
- the electrical generator may include a generator gearbox that is configured to step up a speed of rotation of the drive shaft.
- the generator gearbox may have a ratio in a range of 1:1.25 to 1:5.
- a mobile power unit in another embodiment, includes a gas turbine engine, a drive shaft, a fixed reduction gearbox, and an electrical generator.
- the gas turbine engine includes an engine output shaft.
- the drive shaft is driven by the gas turbine engine and is configured to connect to a hydraulic fracturing pump so that the pump provides high pressure fluid for hydraulic fracturing.
- the fixed reduction gearbox is positioned between the gas turbine engine and the drive shaft.
- the reduction gear box reducing a speed of rotation of the engine output shaft of the gas turbine engine to a speed for rotation of the drive shaft.
- the electrical generator is connected to the drive shaft and includes a step up generator gearbox and an alternator. The alternator being configured to generate electrical power.
- the fixed reduction gearbox may have a ratio in a range of 5:1 to 20:1, e.g., 11:1.
- the fixed reduction gearbox may reduce a maximum speed of the drive shaft to 1500 RPM.
- the alternator may be a permanent magnet alternator having 2 or 4 poles.
- a well pad in yet another embodiment of the disclosure, includes a plurality of mobile power units, and a blender unit, a hydration unit, or a chemical additive unit.
- Each mobile power unit of the plurality of mobile power units includes a gas turbine engine, a drive shaft, a reduction gearbox, and a transportation platform.
- the gas turbine engine includes an engine output shaft that rotates to provide energy from the gas turbine engine.
- the reduction gearbox is disposed between the engine output shaft and the drive shaft such that the speed of rotation of the engine output shaft is reduced to a speed of the drive shaft.
- the reduction gearbox may have a ratio in a range of 5:1 to 20:1.
- the transportation platform may include a drive equipment receiver defined thereon.
- the gas turbine engine mounted to the transportation platform such that the reduction gearbox and the drive shaft are secured to the transportation platform.
- the well pad includes a first mobile power unit that includes an electrical generator installed in the drive equipment receiver of the transportation platform such that the electrical generator is driven by the gas turbine engine of the first mobile power unit.
- the well pad includes a second mobile power unit that includes a hydraulic fracturing pump installed in the drive equipment receiver of the transportation platform such that the hydraulic fracturing pump is driven by the gas turbine engine of the second mobile power unit.
- the blender unit, hydration unit, or chemical additive unit includes a first pump that includes an electric motor to rotate the first pump. The first pump receiving electrical power from the electrical generator of the first mobile power unit.
- a method of changing drive equipment of a mobile power unit includes operating a first mobile power unit in a first configuration, operating the first mobile power unit in a second configuration, and interchanging the first mobile power unit between the first configuration and the second configuration.
- Operating the first mobile power unit in the first configuration includes a gas turbine engine of the first mobile power unit driving a pump to provide high pressure fluid.
- the pump connected to a drive shaft that has a maximum speed of rotation in a range of 1000 RPM to 1700 RPM.
- Operating the first mobile power unit in the second configuration includes the gas turbine engine driving an electrical generator to provide electrical power with the electrical generator connected to the drive shaft.
- Interchanging the first mobile power unit between the first and second configurations includes changing the pump or the electrical generator for the other of the pump and the electrical generator.
- operating the first mobile power unit in the second configuration includes providing electrical power to a blender unit, a hydration unit, or a chemical additive unit of a well pad or providing electrical energy to auxiliary equipment of the second mobile power unit.
- interchanging the first mobile power unit between the first configuration and the second configuration may include disconnecting the pump form an output flange of the drive shaft, lifting a first skid including the pump from a drive equipment receiver of a transportation platform of the first mobile power unit, installing a second skid including the electrical generator into the drive equipment receiver, and connecting the electrical generator to the output flange of the drive shaft.
- the first skid may be lifted with a crane or a forklift and may occur at a well pad.
- a method of controlling a well pad includes controlling a first mobile power unit, a second mobile power unit, and a blender unit, a hydration unit, or a chemical additive unit with a supervisory control unit.
- the first mobile power unit includes a gas turbine engine driving an electrical generator.
- the second mobile power unit includes a gas turbine engine driving a hydraulic fracturing pump.
- the blender unit, hydration unit, or chemical additive unit receives electrical power from the first mobile power unit.
- FIG. 1 is a schematic view of a well pad layout according to an embodiment of the disclosure.
- FIG. 2 is a table illustrating exemplary power consumption of pumps of a blender unit according to an embodiment of the disclosure.
- FIG. 3 is a perspective view of a mobile power unit according to an embodiment of the disclosure.
- FIG. 4 is a schematic view of the mobile power unit of FIG. 3 driving a fracturing pump according to an embodiment of the disclosure.
- FIG. 5 is a schematic view of the mobile power unit of FIG. 3 driving a generator according to an embodiment of the disclosure.
- FIG. 6 is schematic view of a mobile power unit driving a reciprocating fracturing pump according to an embodiment of the present disclosure.
- FIG. 7 is schematic view of a mobile power unit driving a reciprocating fracturing pump including a torsional vibration dampener and torque sensor according to an embodiment of the present disclosure.
- FIG. 8 is schematic view of a mobile power unit driving a generator including a torsional vibration dampener and torque sensor according to an embodiment of the present disclosure.
- FIG. 9 is an exploded perspective view, with parts separated, of an alternator of an electrical generator of a mobile power unit of FIG. 8 according to an embodiment of the present disclosure.
- FIG. 10 is a flow chart of a method of changing drive equipment of a mobile power unit according to an embodiment of the disclosure.
- FIG. 11 is a flow chart of a method of controlling a well pad according to an embodiment of the disclosure.
- FIG. 12 is a flow chart of a method of changing drive equipment of a mobile power unit according to an embodiment of the disclosure.
- Embodiments of the present disclosure are directed to mobile power units and associated methods that may include interchangeable drive equipment.
- mobile power units may include an engine that is coupled to drive equipment such that the drive equipment is driven by the engine.
- the drive equipment may be a hydraulic fracturing pump or an electrical generator that is interchangeable in the field to allow for a quick changeover between providing high pressure fluid with the fracturing pump and providing electrical power with the electrical generator or vice versa depending on the demands of the well pad.
- FIG. 1 illustrates an exemplary well pad layout 1000 that is provided in accordance with an embodiment of the present disclosure.
- the well pad layout 1000 includes a plurality of mobile power units 100 arranged around a wellhead 10 to supply the wellhead 10 with high-pressure fracturing fluids and recover oil and/or gas from the wellhead 10 as will be understood by those skilled in the art.
- some of the mobile power units 100 e.g., mobile power units 100 a , drive a hydraulic fracturing pump 200 that provides high pressure fluid to a manifold 20 such that the high pressure fluid is provided to the wellhead 10 .
- the mobile power units 100 e.g., mobile power units 100 b
- the well pad layout 1000 may include auxiliary or backside equipment 400 , as will be understood by those skilled in the art, that requires electrical power to provide fluids to the manifold 20 or the wellhead 10 .
- the backside equipment 400 of the well pad layout 100 may include a blender unit 410 , a hydration unit 420 , or a chemical additive unit 430 .
- Each of the units 410 , 420 , 430 may be supplied electrical power or electrified such that pumps and other equipment of the units 410 , 420 , 430 run on the electrical power.
- blender units, hydration units, and chemical additive units require horsepower provided by diesel deck engines or small diesel generators.
- the diesel deck engines and generators may include gearboxes, transmissions, and hydraulic circuits that each require maintenance and may cause failures or breakdowns of the respective unit 410 , 420 , 430 .
- Electrifying the units 410 , 420 , 430 by replacing the diesel deck engines, gearboxes, transmissions, and hydraulic circuits with electrical motors may increase in-service time, reduce running costs, decrease maintenance, and decrease emissions of the units 410 , 420 , 430 .
- electrifying the units 410 , 420 , 430 may allow the units 410 , 420 , 430 of the auxiliary or backside equipment to meet tier 4 emissions standards.
- the electrical power requirements of the units 410 , 420 , 430 may be calculated for a wellhead, e.g., wellhead 10 , having a maximum anticipated flow rate of 125 barrels per minute (BPM).
- BPM barrels per minute
- the electrical power demands of the pumps of the blender unit 410 may be calculated based on a maximum anticipated flow rate of the well pad or the fracturing site. Given the maximum anticipated flow rate of 125 BPM, the table of FIG. 2 illustrates exemplary calculations of the power demands of pumps of the blender unit 410 .
- the blender unit 410 may include a suction pump 412 , a discharge pump 414 , and multiple chemical pumps 416 .
- the chemical pumps 416 may be included on the blender unit 410 or the chemical additive unit 430 .
- the maximum flow rate of 125 BPM converts to a maximum flow rate of 5250 gallons per minute (GPM) through the blender unit 410 .
- GPM revolutions per minute
- a suction pump 412 of the blender unit 410 may operate at 1250 revolutions per minute (RPM) with an output pressure of 30 pounds per square inch (psi) such that with an eighty percent efficiency of the suction pump 412 , the suction pump 412 may be sized as a 115 horsepower electrical pump.
- Such a 115 horsepower pump may have an electrical draw of 86 kilowatts (kW) as will be understood by those skilled in the art. Given a motor efficiency of eighty percent, however, an electrical driving motor for the suction pump 412 may have an electrical draw of 110 kW. Repeating this calculation for the discharge pump 414 results in an electrical draw of 750 kW for the motor driving the discharge pump 414 . Similarly, the chemical pumps 416 may have an electrical draw of 1 kW.
- the blender unit 410 also may include other auxiliary components that require electrical power including, but not limited to, sand augers, air compressors, and PLC controllers. The power requirements for these auxiliary components of the blender unit 410 may require 250 kW of electrical power.
- the total electrical power to run the blender unit 410 at the maximum flow rate of 125 BPM is 1,100 kW.
- This process may be repeated for a hydration unit 420 which may have an electrical power requirement of 690 kW.
- the total electrical requirement to run the units 410 , 420 , 430 may be 1,790 kW as will be understood by those skilled in the art.
- a single mobile power unit 100 including an engine 120 producing 5100 horsepower may be converted by an electrical generator 300 to produce 3,800 kW of electrical power which would be more than sufficient to provide electrical power for the units 410 , 420 , 430 of the auxiliary equipment.
- auxiliary equipment of the mobile power units 100 may include, but not be limited to, fuel pumps, cooling pumps, oil/lubrication pumps, cooling fans, and controllers as understood by those skilled in the art.
- the electrical power requirements for the auxiliary equipment of the mobile power unit may be 270 kW.
- a well pad layout e.g., well pad layout 1000
- the total electrical power requirement for electrifying the auxiliary equipment of the mobile power units 100 of the well pad layout 1000 collectively may be 2,160 kW.
- the total electrical power requirement of the well pad layout 1000 may be the sum of the 1,790 kW for the units 410 , 420 , 430 and the 2,160 kW for electrifying the auxiliary equipment of eight mobile power units 100 a such that the total electrical power requirement for the well pad layout 1000 may be 3,950 kW.
- This electrical power requirement may be beyond the capability of a single mobile power unit 100 b driving an electrical generator 300 .
- at least two mobile power units 100 b driving electrical generators 300 would be required.
- a third mobile power unit 100 b driving an electrical generator 300 may be desired for redundancy sake.
- the third mobile power unit 100 b driving an electrical generator 300 may allow for maintenance and downtime on one of the mobile power units 100 b driving electrical generators 300 or be available as an extra mobile power unit 100 a as the drive equipment, e.g., the pump 200 or electrical generator 300 , is and field changeable as detailed below.
- the well pad layout 1000 may include a supervisory control unit 30 that monitors and controls operation of the mobile power units 100 a driving fracturing pumps 200 , the mobile power units 100 b driving electrical generators 300 , and the units 410 , 420 , 430 .
- the supervisory control unit 30 may be a mobile control unit in the form of a trailer or a van, as appreciated by those skilled in the art. In some embodiments, the supervisory control unit 30 receives electrical power from the mobile power units 100 b.
- FIG. 3 illustrates an exemplary mobile power unit 100 that is provided in accordance with an embodiment of the present disclosure.
- the mobile power units 100 detailed herein include a gas turbine engine 120 that provides mechanical horsepower to drive equipment in the form of a hydraulic fracturing pump 200 or an electrical generator 300 .
- the hydraulic fracturing pump 200 and the electrical generator 300 are designed as modular components that may be removed and replaced with another pump 200 or generator 300 without modifying the remainder of the mobile power unit 100 .
- Such a modular design may allow for a single mobile power unit 100 to drive a pump 200 and then be changed over to drive an electrical generator 300 , or vice versa, depending on the demands of the well pad.
- the exemplary mobile power unit 100 a of FIG. 3 includes transportation platform 110 , an engine 120 , and a hydraulic fracturing pump 200 .
- the transportation platform 110 is shown as a single trailer with the entire mobile power unit 100 and components thereof mounted or installed thereto. For example, it may be advantageous to have the entire mobile power unit 100 mounted to a single trailer such that setup and startup of the mobile power unit 100 does not require onsite assembly of the mobile power unit 100 . In addition, mounting the entire mobile power unit 100 to a single trailer may decrease a footprint of the mobile power unit 100 .
- the transportation platform 110 may be a trailer that may be pulled by a tractor (not shown) on and off public highways as will be understood by those skilled in the art. In some embodiments, the transportation platform may include more than one trailer.
- the engine 120 is mounted to the transportation platform 110 and may be any suitable engine including, but not limited to, an internal combustion engine or a gas turbine engine.
- the engine 120 may be a dual fuel engine operating on gasoline, natural gas, well gas, field gas, diesel, and/or other suitable fuel.
- the engine 120 may be a dual fuel engine operating on a liquid fuel and a gaseous fuel.
- the engine 120 is a dual fuel gas turbine engine that asynchronously operates on diesel fuel, e.g., #2 diesel as will be understood by those skilled in the art, and on a gaseous fuel, e.g., natural gas, well gas, or field gas.
- the engine 120 is a dual fuel, dual shaft gas turbine engine that operates on a liquid fuel such as diesel fuel and a gaseous fuel such as natural gas, well gas, or field gas.
- FIGS. 4 and 5 illustrate that an embodiment of a mobile power unit 100 that selectively may be provided with either a fracturing pump 200 ( FIG. 4 ) or an electrical generator 300 ( FIG. 5 ) that is driven by the engine 120 .
- the pump 200 and the electrical generator 300 may be referred to generally as the “drive equipment.”
- the mobile power unit 100 includes a drive equipment position or receiver 190 that receives and secures the drive equipment to the mobile power unit 100 such that the drive equipment is driven by the engine 120 of the mobile power unit 100 .
- the mobile power unit 100 may include auxiliary equipment to support the mobile power unit 100 .
- the engine 120 may include a starter 121 that is used to start the engine 120 .
- a gearbox 130 may include a gearbox lubrication pump 138 that provides lubrication to the gearbox 130 .
- the mobile power unit 100 also may include a drive lubrication pump 180 that provides lubrication to drive equipment installed in a drive equipment receiver 190 .
- the drive equipment receiver 190 may be a recess in an upper surface of the transportation platform 110 that is sized to receive the drive equipment therein.
- the embodiment of the mobile power unit 100 further may include other auxiliary equipment in the form of cooling or heating fans, controllers, and pumps.
- the auxiliary equipment of the mobile power unit 100 may be driven by deck engines or may be electrified as detailed herein.
- the pump 200 and the electrical generator 300 may be secured to a skid 220 , 320 , as will be understood by those skilled in the art, that provides for a stable base for the pump 200 or the electrical generator 300 and allows for the pump 200 or the electrical generator 300 to be lifted from and installed or mounted within the drive equipment receiver 190 of the mobile power unit 100 .
- the skid 220 , 320 may be constructed from a structural steel, e.g., AISI 1018 steel.
- the skid 220 , 320 may include alignment features that align the skid 220 , 320 within the drive equipment receiver 190 such that drive components and/or auxiliary equipment of the pump 200 or the generator 300 are aligned with the components of the mobile power unit 100 , e.g., the engine 120 .
- the skids 220 , 320 may include lifting slots 225 , 325 positioned therein that are sized to be engaged by components of a lifting device, e.g., a fork of a forklift, as would be appreciated by one skilled in the art, such that the respective skid 220 , 320 , including a pump 220 or generator 300 , to be lifted onto or removed from the drive equipment receiver 190 of the mobile power unit 100 .
- the skid 220 , 320 may include auxiliary components that support operation of the respective one of the pump 200 or the electrical generator 300 .
- the pump 200 or the electrical generator 300 may include lifting loops 210 , 310 , respectively, that allow for lifting of the pump 200 or the electrical generator 300 by a crane or other lifting device, as would be appreciated by one skilled in the art, to be lifted onto or removed from the drive equipment receiver 190 of the mobile power unit 100 .
- the lifting loops 210 , 310 may be secured to the skids 220 , 320 or to a body of the pump 200 or the generator 300 . Having both the lifting loops 210 , 310 and the lifting slots 215 , 315 allow for removal and installation of the pump 200 or the electrical generator 300 in a field or in a shop environment.
- FIG. 6 schematically illustrates an embodiment of the mobile power unit 100 with an engine 120 connected to a pump 200 that is installed in the drive equipment receiver 190 of the mobile power unit 100 .
- the engine 120 includes a power end 126 that directly drives an engine output shaft 128 .
- the engine output shaft 128 is coupled to a reduction gearbox 130 such that a speed of rotation of the engine output shaft 128 is stepped down to a speed of rotation of a gearbox output shaft 134 of the gearbox 130 that is suitable for a hydraulic fracturing pump, e.g., pump 200 .
- a speed of rotation of the engine output shaft 128 of the engine 120 may be 16,500 RPM and a speed of rotation of the gearbox output shaft 134 of the gearbox 130 that is suitable for the pump 200 may be 1500 RPM such that a ratio of the reduction gearbox 130 is an 11:1 reduction.
- the reduction gearbox 130 may have a ratio in a range of 5:1 to 20:1 depending on the specifications of the engine 120 and the pump 200 to be driven by the engine 120 .
- the gearbox output shaft 134 of gearbox 130 includes an output flange 136 that is coupled to an input flange 142 of a drive shaft 140 such that the drive shaft 140 is directly driven by the engine 120 via the gearbox 130 .
- the drive shaft 140 includes an output flange 144 that releasably and selectively may be connected to an input shaft 250 of the pump 200 such that the pump 200 is directly driven by the engine 120 via the drive shaft 140 .
- FIG. 7 schematically illustrates an embodiment of a mobile power unit 100 with the engine 120 connected to the pump 200 that is installed in the drive equipment receiver 190 of the mobile power unit 100 such that the pump 200 is driven by the engine 120 via the drive shaft 140 in a manner as detailed above.
- the drive shaft 140 includes a torsional vibration damper (TVD) system 150 and a torque sensor 158 , as will be understood by those skilled in the art.
- the TVD system 150 may dampen torque variations from the engine 120 to the pump 200 and/or may dampen reaction torque variations from the pump 200 to the engine 120 .
- the TVD system 150 may prevent or reduce torque variations experienced by the engine 120 , the gearbox 130 , the drive shaft 140 , and/or the pump 200 such that a service interval or the service life of the engine 120 , the gearbox 130 , the drive shaft 140 , and/or the pump 200 may be extended.
- the drive shaft 140 also may include one or more torque sensors 160 installed thereon that measure a torque of the drive shaft 140 .
- the torque sensors 160 may provide a signal to one or more controllers of the mobile power unit 100 , e.g., a controller of the engine 120 or a controller of the pump 200 .
- the controllers of the mobile power unit 100 or the torque sensors 160 may provide a signal to the supervisory control unit 30 ( FIG. 1 ) indicative of the torque of the drive shaft 140 .
- the torque of the drive shaft 140 may be used in one or more control algorithms for the engine 120 .
- FIG. 8 schematically illustrates an embodiment of a mobile power unit 100 with the engine 120 connected to an electrical generator 300 that is installed in the drive equipment receiver 190 of the mobile power unit 100 such that the electrical generator 300 is driven by the engine 120 via the drive shaft 140 .
- the generator 300 includes an alternator 330 that rotates to generate alternating current (AC) electrical power which is suitable for the units 410 , 420 , 430 ( FIG. 1 ), the auxiliary equipment of the mobile power units 100 a , or the supervisory control unit 30 ( FIG. 1 ).
- the speed of rotation of the alternator 330 that is suitable for generation of electrical power depends on the number of poles of the alternator 330 and the frequency of the AC power as represented by the following equation:
- f is the output frequency in hertz (Hz)
- P is the number of poles
- N is the RPM of the alternator.
- the rotational speed of the alternator 330 to provide AC power 60 Hz may be 3600 RPM for a 2-pole configuration and 1800 RPM for a 4-pole configuration.
- Those skilled in the art recognize that other speeds may be suitable for rotation of the alternator 330 depending on the desired frequency of the AC power, e.g., 50 Hz or 60 Hz, or the number of poles of the alternator, e.g., 2, 4, 6, 8, 10 poles.
- the electrical generator 300 includes an input shaft 350 that releasably couples or otherwise connects to the output flange 144 of the drive shaft 140 .
- the electrical generator 300 may be a selective replacement for the pump 200 , and the gearbox 130 has a fixed reduction ratio in a range of 5:1 to 20:1, e.g., 11:1, based on the speed requirements of the pump 200 , the drive shaft 140 has a maximum speed of rotation of 1500 RPM. This results in the speed of rotation of the drive shaft 140 being less that what is required by the alternator 330 of the electrical generator 300 as detailed above with respect to a 2-pole or 4-pole configuration of the alternator 330 .
- the electrical generator 300 includes a step up generator gearbox 360 to increase the speed of rotation of the input shaft 350 to a speed of rotation that is suitable for the electrical generator 300 .
- the ratio of the generator gearbox 360 ratio is set based on keeping the engine running at as high of a load and speed as possible and the number of poles of the electrical generator 300 .
- the generator gearbox 310 may have a ratio of 1:2.5 which allows for the speed of rotation of the electrical generator 300 to be 1800 RPM or 3600 RPM depending on the number of poles of the generator 300 installed on the mobile power unit 100 .
- ratios in a range of 1:1.25 to 1:5 may be used based on a desired speed of rotation of the electrical generator 300 as will be understood by those skilled in the art.
- the speed of the engine 120 may be controlled by the supervisory control unit 30 .
- Including a generator gearbox 360 which may allow for the electrical generator 300 selectively to be changed with the pump 200 by releasably coupling or connecting to the drive shaft 140 without changing the ratio of the reduction gearbox 130 of the engine 120 .
- the efficiency of the reduction gearbox 130 may be increased and/or the complexity of changing the drive equipment may be simplified.
- the alternator 330 of the electrical generator 300 is designed and sized based on the electrical demands of the fracturing fleet, e.g., the power demands of the well pad layout. As detailed above, when the alternator 330 is providing electrical power for the units 410 , 420 , 430 ( FIG. 1 ), the electrical power requirement is 1,790 kW, and when the engine 120 is a 5,100 horsepower engine, the engine 120 may be capable of providing 3,800 kW of energy. Thus, the alternator 330 should be sized to generate at least 1,800 kW and to be capable of generating 3,800 kW when required. For example, when auxiliary equipment of the mobile power units 100 a also are provided with electrical power from one or more generators 300 .
- FIG. 9 illustrates a construction of an exemplary alternator 330 in an exploded perspective view as provided in accordance with embodiments of this disclosure.
- the alternator 330 may be a permanent magnet alternator and more specifically, an AC synchronous alternator in which the stator and the rotor spin at the same speed. Such an alternator may have increased efficiency when compared to other alternators and does not require electrical power to the rotor to generate electrical power.
- the alternator 330 includes a rotor mount 332 , a solid rotor 334 , a stator 336 , a field coil 338 , and a housing 440 .
- the rotor mount 332 is attached to an output shaft of the generator gearbox 360 ( FIG.
- the rotor mount 332 may include a blower 333 that includes vanes to direct fluid flow within the alternator 330 to cool internal components of the alternator 330 .
- the rotor 334 is mounted to the rotor mount 332 such that the rotor 334 is rotatably fixed to the rotor mount 332 .
- the rotor 334 may be a solid rotor and includes permanent magnets 335 mounted therein.
- the rotor 334 may include 12 permanent magnets 335 which may be NdFeB magnets, for example, as will be understood by those skilled in the art.
- the stator 336 is mounted to the rotor mount 332 within the rotor 334 such that the stator 336 rotates in concert with the rotor 334 .
- the stator 336 may be a 6-phase stator, for example.
- the field coil 338 is mounted to the housing 340 about the stator 336 such that as the rotor 334 and the stator 336 rotate, AC power is transferred to terminals 342 of the housing 340 .
- the housing 340 is disposed over the rotor mount 332 , the solid rotor 334 , the stator 336 , and the field coil 338 such that the rotor mount 332 , the solid rotor 334 , the stator 336 , and the field coil 338 rotate within the housing 340 .
- embodiments of the alternator 330 also may require a cooling system 370 to cool internal components of the alternator 330 .
- the cooling system 370 includes a coolant pump 372 that circulates fluid through the alternator 330 to cool internal components thereof.
- the fluid may be air or glycol water, as will be understood by those skilled in the art.
- the cooling system 370 of the alternator 330 is self-sufficient such that the cooling system 370 is powered by the alternator 330 when the alternator 330 generates electrical power.
- the cooling system 370 of the alternator 330 requires external power to power the cooling system 370 .
- the cooling system 370 may be powered by a lubrication system 180 of the mobile power unit 100 ( FIG. 4 ) that is configured to cool the pump 200 when the pump 200 is installed on the mobile power unit 100 .
- the lubrication system 180 may include a changeover valve to be compatible with the cooling pump 372 of the generator 300 .
- the cooling system 370 may require a coolant storage tank 374 which may be mounted to the skid 320 or the alternator 330 such that the cooling system 370 and the coolant storage tank is part of the electrical generator 300 and is installed with the electrical generator 300 .
- FIG. 10 illustrates a method 1001 of changing a power device of a mobile power unit in accordance with exemplary embodiments of the present disclosure with reference to the mobile power unit of FIGS. 3-5 .
- the method 1001 includes a mobile power unit 100 driving a pump 200 in a first configuration (Step 1010 ), an electrical generator 300 in a second configuration (Step 1020 ), and changing the pump 200 or the electrical generator 300 for the other of the pump 200 or the electrical generator 300 (Step 1100 ).
- the method 1001 may include receiving a signal indicative of an electrical demand, an electrical supply, a fluid requirement, or a fluid supply of a well pad site.
- Changing the mobile power unit 100 between the first configuration and the second configuration may occur at least in part as a result of analyzing or determining that the electrical demand of the well pad site is greater than the electrical supply, that a fluid supply is greater than a fluid requirement of the well pad site, that an electrical supply is greater than an electrical demand of the well pad site, or that the fluid requirement of the well pad site is greater than the fluid supply.
- a gas turbine engine 120 of the mobile power unit 100 drives the pump 200 to provide high pressure fluid (Step 1010 ).
- the pump 200 is connected to a drive shaft 140 of the mobile power unit 100 .
- the drive shaft 140 may have a maximum speed of rotation in a range of 1000 RPM to 1700 RPM.
- Operating the mobile power unit 100 in the first configuration may include operating the gas turbine engine 120 on field gas, for example.
- the method 1001 may include selectively interchanging the pump 200 of the mobile power unit 100 for the electrical generator 300 (Step 1100 ).
- Interchanging the pump 200 for the electrical generator 300 may include disconnecting the pump 200 from an output flange 144 of the drive shaft 140 (Step 1110 ) before lifting a skid 220 that includes the pump 200 from a drive equipment receiver 190 of a transportation platform 110 of the mobile power unit 100 (Step 1120 ).
- Lifting the skid 220 may include lifting the skid 200 with a crane or a forklift.
- a skid 320 including the electrical generator 300 is installed into the drive equipment receiver 190 of the transportation platform 110 (Step 1130 ).
- the electrical generator 300 is connected to the output flange 144 of the drive shaft 140 (Step 1140 ). Interchanging the pump 200 for the electrical generator 300 may occur at a well pad or at a plant.
- the mobile power unit 100 is operated in a second configuration in which the gas turbine engine 120 drives the electrical generator 300 (Step 1020 ), e.g., instead of the pump 200 , to provide electrical power.
- the mobile power unit 100 may provide electrical power to a blender unit 410 , a hydration unit 420 , or a chemical additive unit 430 of a well pad 1000 .
- the mobile power unit 100 may provide electrical power to auxiliary equipment of another mobile power unit 100 which includes a gas turbine engine 120 driving a hydraulic fracturing pump 200 .
- Operating the mobile power unit 100 in the second configuration may include operating the gas turbine engine 120 on field gas.
- the method 1001 may include monitoring and controlling the electrical generator of the first mobile power unit 100 with a supervisory control unit 30 ( FIG. 1 ).
- the supervisory control unit 30 may monitor and control delivery of a high pressure fluid of a second mobile power unit having a gas turbine engine driving a pump simultaneously with monitoring and controlling the first mobile power unit in the second configuration.
- the method 1001 may include selectively interchanging the electrical generator 300 of the mobile power unit 100 for the pump 200 (Step 1150 ).
- Interchanging the electrical generator 300 for the pump 200 may include disconnecting the electrical generator 300 from the output flange 144 of the drive shaft 140 (Step 1160 ) before lifting a skid 220 that includes the electrical generator 300 from a drive equipment receiver 190 of a transportation platform 110 of the mobile power unit 100 (Step 1170 ).
- Lifting the skid 220 may include lifting the skid 200 with a crane or a forklift. With the electrical generator 300 removed, a skid 220 including the pump 200 is installed into the drive equipment receiver 190 of the transportation platform 110 (Step 1180 ).
- the pump 200 is connected to the output flange 144 of the drive shaft 140 (Step 1190 ). Interchanging the electrical generator 300 for the pump 200 may occur at a well pad or at a plant.
- FIG. 11 shows a method 1200 of controlling a well pad in accordance with exemplary embodiments of the present disclosure with reference to the well pad 1000 of FIG. 1 .
- the method 1200 includes operating a supervisory control unit 30 to control a first mobile power unit 100 , to control a second mobile power unit 100 , and to control a blender unit 410 , a hydration unit 420 , or a chemical additive unit 430 .
- Operating the supervisory control unit 30 includes receiving operating parameters of the well pad 1000 at the supervisory control unit 30 ( 1210 ). In response to receiving operating parameters, the supervisor control unit 30 provides control signals to the first mobile power unit 100 to control the first mobile power unit 100 (Step 1230 ), provides control signals to the second mobile power unit 100 (Step 1250 ), and provides control signals to the blender unit 410 , the hydration unit 420 , or the chemical additive unit 430 (Step 1270 ).
- the supervisory control unit 30 may receive feedback signals from first mobile power unit 100 (Step 1220 ) and may modify control signals provided to the first mobile power unit 100 in response to the feedback signals (Step 1240 ). For example, the supervisory control unit 30 may change a supply of air or fuel to the gas turbine engine 120 such that the gas turbine engine 120 changes power delivery to the electrical generator 300 based on energy demands of the well pad 100 .
- the supervisory control unit 30 may calculate energy demands of the well pad 1000 by monitoring or receiving feedback from the first mobile power unit 100 , the second mobile power unit 100 , and a blender unit 410 , a hydration unit 420 , or a chemical additive unit 430 .
- the method 1200 may include the first mobile power unit 100 providing power to a supervisory control vehicle that includes the supervisory control unit 30 .
- the supervisory control unit 30 may receive feedback signals from the second mobile power unit 100 (Step 1220 ) and may modify control signals provided to the second mobile power unit 100 in response to the feedback signals (Step 1260 ). For example, the supervisory control unit 30 may change the supply of air or fuel to the gas turbine engine 120 of the second mobile power unit 100 to change an amount or pressure of a high pressure fluid from the pump 200 in response to the feedback signals of the second mobile power unit 100 .
- the supervisory control unit 30 may receive feedback signals from the blender unit 410 , the hydration unit 420 , or the chemical additive unit 430 (Step 1220 ) and may modify control signals provided to the units 410 , 420 , or 430 based on the feedback signals (Step 1280 ). For example, the supervisory control unit 30 may change an amount of fluid provided to the pump 200 by a respective one units 410 , 420 , or 430 . The supervisory control unit 30 may control the units 410 , 420 , 430 by changing a supply or electrical power from the electrical generator 300 of the first mobile power unit 100 .
- FIG. 12 illustrates a method 1300 of changing drive equipment of a mobile power unit in accordance with exemplary embodiments of the present disclosure with reference to the mobile power unit of FIGS. 3-5 .
- the method 1300 includes operating a mobile power unit 100 in a first configuration (Step 1310 ), receiving one or more signals indicative of an electrical demand or fluid requirements of a well pad site (Step 1320 ), determining that the electrical demand of the well pad site 1000 is greater than an electrical supply or that a fluid capacity is greater than the fluid requirements (Step 1330 ), and interchanging the first mobile power unit 100 from a first configuration to a second configuration (Step 1340 ).
- Operating the first mobile power unit 100 in the first configuration includes the first mobile power unit 100 driving a pump 200 to provide high pressure fluid to the well pad site 1000 .
- the mobile power unit 100 includes a gas turbine engine 120 that drives the pump 200 to provide the high pressure fluid.
- the pump 200 is connected to a drive shaft 140 of the mobile power unit 100 which has a reduction gearbox 130 such that the drive shaft 140 may have a maximum speed of rotation in a range of 1000 RPM to 1700 RPM.
- Operating the mobile power unit 100 in the first configuration may include operating the gas turbine engine 120 on field gas, for example.
- a supervisory control unit 30 of the well pad site 1000 receives demand signals from equipment of the well pad site 1000 and input from the operators at the well pad site 1000 that are indicative of an electrical demand and fluid requirements of the well pad site 1000 (Step 1320 ).
- the supervisory control unit 30 may receive performance signals from equipment of the well pad site 1000 (e.g., mobile power units 100 , pumps 200 , generators 300 , or auxiliary units 410 , 420 , 430 ) (Step 1325 ).
- the supervisory control unit 30 may display the electrical demand and the fluid requirements of the well pad site 1000 and display the current electrical supply and fluid supply of the well pad site 1000 based on the signals received.
- the operator or the supervisory control unit 30 may compare the electrical demand to the electrical supply or the fluid requirements to the fluid capacity (Step 1330 ). When the operator or the supervisory control unit 30 determines that the electrical demand of the well pad site 1000 is greater than the electrical supply or that the fluid capacity is greater than the fluid requirements, the first mobile power unit 100 may be interchanged from the first configuration to a second configuration (Step 1340 ). The decision to interchange the first mobile power unit 100 may be made to optimize electrical supply or fluid capacity or to allow for maintenance of other mobile power units 100 . When the electrical demand is less than the electrical supply and the fluid capacity is less than the fluid requirements, the first mobile power unit 100 may remain in the first configuration.
- the pump 200 of the first mobile power unit 100 is changed for an electrical generator 300 (Step 1350 ).
- the electrical generator 300 is connected to the drive shaft 140 to produce electrical energy for the well pad site 1000 .
- the electrical generator 300 includes a generator gearbox 360 to at least partially offset the reduction gearbox 130 .
- the electrical generator 300 may provide electrical power to auxiliary units such as a blender unit 410 , a hydration unit 420 , or a chemical additive unit 430 .
- the supervisory control unit 30 of the well pad site 1000 may continue to receive demand signals from equipment of the well pad site 1000 and input from the operators at the well pad site 1000 that are indicative of an electrical demand and fluid requirements of the well pad site 1000 (Step 1360 ).
- the supervisory control unit 30 may receive performance signals from equipment of the well pad site 1000 (e.g., mobile power units 100 , pumps 200 , generators 300 , or auxiliary units 410 , 420 , 430 ) (Step 1365 ).
- the supervisory control unit 30 may display the electrical demand and the fluid requirements of the well pad site 1000 and display the current electrical supply and fluid supply of the well pad site 1000 based on the signals received.
- the operator or the supervisory control unit 30 may compare the electrical demand to the electrical supply or the fluid requirements to the fluid capacity (Step 1370 ). When the operator or the supervisory control unit 30 determines that the fluid requirements of the well pad site 1000 is greater than the fluid capacity or that the electrical supply is greater than the electrical demand, the first mobile power unit 100 may be interchanged from the first configuration to a second configuration (Step 1380 ). The decision to interchange the first mobile power unit 100 may be made to optimize electrical supply or fluid capacity or to allow for maintenance of other mobile power units 100 . When the fluid requirement is less than the fluid capacity and the electrical supply is less than the electrical demand, the first mobile power unit 100 may remain in the second configuration.
- the electrical generator 300 of the first mobile power unit 100 is changed for a pump 200 (Step 1390 ).
- the pump 200 is connected to the drive shaft 140 to produce fluid capacity for the well pad site 1000 .
- Interchanging the first mobile power unit 100 between the first configuration and the second configuration may occur at a well pad site 1000 .
Abstract
Description
- This is a divisional of U.S. Non-Provisional application Ser. No. 17/301,305, filed Mar. 31, 2021, titled “DRIVE EQUIPMENT AND METHODS FOR MOBILE FRACTURING TRANSPORTATION PLATFORMS,” which claims priority to and the benefit of, under 35 U.S.C. § 119(e), U.S. Provisional Application No. 62/705,055, filed Jun. 9, 2020, titled “DRIVE EQUIPMENT AND METHODS FOR MOBILE FRACTURING TRANSPORTATION PLATFORMS,” the disclosures of which are incorporated herein by reference in their entireties.
- The application generally relates to mobile power units and, more specifically, drive equipment and methods for usage and installation on mobile fracturing transportation platforms.
- Conventional hydraulic fracturing horsepower units often utilize diesel reciprocating engines to drive positive displacement reciprocating pumps. These pumps generally form a part of a fracturing fluid system which often includes auxiliary equipment such as blenders, hydration, and chemical pumps. This auxiliary equipment is commonly referred to as backside equipment and may be powered by diesel reciprocating deck engines or small mobile diesel generators.
- The fracturing industry has been making strides to reduce emissions and footprint. Specifically, the fracturing industry has been making strides to reach government mandated tier 4 emissions standards, namely a government mandated reduction in harmful exhaust gases for diesel powered equipment. One way the fracturing industry is moving towards tier 4 emissions is to replace the diesel reciprocating engines with turbine engines that are fueled with natural gas to directly drive hydraulic fracturing pumps. This allows fracturing horsepower units to reach tier 4 emission standards. The backside equipment, however, remains driven by engines or generators that struggle with meeting or otherwise do not meet tier 4 emission standards.
- In addition, often it is necessary to run multiple diesel engines to power backside equipment, and running multiple diesel engines to power backside equipment may increase costs both through fuel consumption and maintenance. The reciprocating engines on the auxiliary equipment, specifically blenders and hydration units, may include a transmission and gearbox inline to power a pump. These added parts may add another mode of failure and further increase maintenance spending.
- One method that has been used for achieving tier 4 emissions standards for the backside equipment is to convert the backside equipment to an electrical fracturing fleet. These electrical fracturing fleets generally use a standalone gas turbine engine generator trailer, or other transportation platform as understood by those skilled in the art, to produce electrical power that is distributed through electrical switch gear to drive electrical motors directly coupled to the horsepower units. These electrical motors may be controlled with a high efficiency, high power factor active front end drive (AFE) or variable frequency drive. The standalone gas turbine engine generator trailer also may be rigged into the backside equipment to power the backside equipment. Although this arrangement may meet tier 4 emission standards under some conditions, an electrical fracturing fleet requires a dedicated generator unit. A dedicated generator unit requires additional cost to develop, build, and maintain.
- Applicant has recognized that using an electrical fracturing fleet with a dedicated turbine generator may not always be feasible or economical. For example, electrical generators are commonly mounted on skids which may restrict mobility and requires extensive rig up procedures. In addition, power transfer may not always be efficient depending on cable lengths and motor efficiencies. Further, weather conditions also play a factor as the fracturing service may be supplied in a wide range of weather conditions which may affect service. For example, high temperature conditions may require different cooling packages since generators start losing efficiency at higher temperatures. During high temperature conditions resistance in generators decreases causing lower efficiencies, if this effect is too high, running an electrical generator may no longer be economical. As such it is not always beneficial to have a dedicated generator.
- In today's oil and gas service environment, flexibility and adaptability may be important. Applicant also has recognized that due to the nature of hydraulic fracturing, more horsepower than what is readily available is often required. Having a mobile power unit that may drive a hydraulic fracturing pump or an electric power generator may be beneficial in terms of flexibility. Accordingly, Applicant further has recognized that being able to quickly configure a mobile power unit driving a turbine generator into a mobile power unit driving a reciprocating pump may allow fracturing equipment to meet these changing horsepower demands and effectuate tier 4 emission standards. In other cases, due to site footprints, providing horsepower is the priority for all available space. As such, having a dedicated generator may not be the best solution for power generation.
- Applicant still further has recognized that another drawback of a dedicated generator is the upfront engineering and cost to produce the unit. The generators may require extensive engineering hours along with different components and parts. The benefit of having a turbine driven fracturing pump that may be configured into an electrical generator provides flexibility and adaptability and may save costs by utilizing similar parts and components.
- According to embodiments of systems and methods of the disclosure, for systems that include a natural gas turbine generator, the backside equipment such as the diesel deck engines, gearboxes, and transmissions may be removed, and instead, backside equipment, such as centrifugal or other types of pumps, may be powered with higher reliability electric pumps. One of the most common modes of failure with this backside equipment is hydraulic leaks or failures. With an electric motor, the need for hydraulic circuits to power the backside equipment may be removed. Thus, converting the backside equipment to be driven by electrical motors may also increase reliability of the backside equipment and, thus, increase uptime or reduce maintenance costs. Also, having electric motors connected to or coupled to pumps, as opposed to hydraulic motors, may yield more efficiency in an electric fleet arrangement, and this, in turn, may result in an improvement in running costs and a reduction in heat rejection which removes need, in some instances, for high air to oil cooler systems, as will be understood by those skilled in the art.
- According to embodiments of systems and methods, it also is anticipated that the natural gas turbine fleets may be converted to be completely electric. With enough turbine generator units and a power distribution system, the natural gas turbine fleets may remove the tier 4 diesel deck engines on the fracturing pumps that often are used to start the turbines and run the on-board auxiliary equipment. This may reduce costs as tier 4 diesel deck engines may be expensive.
- Further, this application is directed to embodiments of high pressure pumps and power generators that readily are installable on mobile fracturing transportation platforms, such as trailers, and that may include a dual fuel, dual shaft turbine engine mounted to the mobile fracturing trailer selectively to drive either the high pressure pumps or the power generators when installed on the mobile fracturing trailer.
- According to one embodiment of the disclosure, a mobile power unit includes a gas turbine engine, a drive shaft, a reduction gearbox, and a transportation platform. The gas turbine engine includes an engine output shaft that rotates to provide energy from the gas turbine engine. The reduction gearbox is disposed between the engine output shaft and the drive shaft such that the speed of rotation of the engine output shaft to a speed of rotation of the drive shaft is reduced. The reduction gearbox may have a ratio in a range of 5:1 to 20:1. The transportation platform includes a drive equipment receiver that is configured to receive drive equipment therein such that the drive equipment is positioned to be connected to the drive shaft. The gas turbine engine is mounted to the transportation platform so that the reduction gearbox and the drive shaft are attached to the transportation platform. The transportation platform having a first configuration when a pump is installed in the drive equipment receiver such that the pump is driven by the gas turbine engine. The pump connected to the drive shaft when the pump is installed in the drive equipment receiver such that the pump is configured to provide high pressure fluid when driven by the gas turbine engine. The transportation platform having a second configuration when an electrical generator is installed in the drive equipment receiver such that the electrical generator is driven by the gas turbine engine. The electrical generator being connected to the drive shaft and configured to provide electrical power when driven by the gas turbine engine.
- In embodiments, the reduction gearbox may have a ratio of 11:1. The electrical generator may include a generator gearbox that is configured to step up a speed of rotation of the drive shaft. The generator gearbox may have a ratio in a range of 1:1.25 to 1:5.
- In another embodiment of the disclosure, a mobile power unit includes a gas turbine engine, a drive shaft, a fixed reduction gearbox, and an electrical generator. The gas turbine engine includes an engine output shaft. The drive shaft is driven by the gas turbine engine and is configured to connect to a hydraulic fracturing pump so that the pump provides high pressure fluid for hydraulic fracturing. The fixed reduction gearbox is positioned between the gas turbine engine and the drive shaft. The reduction gear box reducing a speed of rotation of the engine output shaft of the gas turbine engine to a speed for rotation of the drive shaft. The electrical generator is connected to the drive shaft and includes a step up generator gearbox and an alternator. The alternator being configured to generate electrical power.
- In embodiment, the fixed reduction gearbox may have a ratio in a range of 5:1 to 20:1, e.g., 11:1. The fixed reduction gearbox may reduce a maximum speed of the drive shaft to 1500 RPM. The alternator may be a permanent magnet alternator having 2 or 4 poles.
- In yet another embodiment of the disclosure, a well pad includes a plurality of mobile power units, and a blender unit, a hydration unit, or a chemical additive unit. Each mobile power unit of the plurality of mobile power units includes a gas turbine engine, a drive shaft, a reduction gearbox, and a transportation platform. The gas turbine engine includes an engine output shaft that rotates to provide energy from the gas turbine engine. The reduction gearbox is disposed between the engine output shaft and the drive shaft such that the speed of rotation of the engine output shaft is reduced to a speed of the drive shaft. The reduction gearbox may have a ratio in a range of 5:1 to 20:1. The transportation platform may include a drive equipment receiver defined thereon. The gas turbine engine mounted to the transportation platform such that the reduction gearbox and the drive shaft are secured to the transportation platform. The well pad includes a first mobile power unit that includes an electrical generator installed in the drive equipment receiver of the transportation platform such that the electrical generator is driven by the gas turbine engine of the first mobile power unit. The well pad includes a second mobile power unit that includes a hydraulic fracturing pump installed in the drive equipment receiver of the transportation platform such that the hydraulic fracturing pump is driven by the gas turbine engine of the second mobile power unit. The blender unit, hydration unit, or chemical additive unit includes a first pump that includes an electric motor to rotate the first pump. The first pump receiving electrical power from the electrical generator of the first mobile power unit.
- In yet another embodiment of the disclosure, a method of changing drive equipment of a mobile power unit includes operating a first mobile power unit in a first configuration, operating the first mobile power unit in a second configuration, and interchanging the first mobile power unit between the first configuration and the second configuration. Operating the first mobile power unit in the first configuration includes a gas turbine engine of the first mobile power unit driving a pump to provide high pressure fluid. The pump connected to a drive shaft that has a maximum speed of rotation in a range of 1000 RPM to 1700 RPM. Operating the first mobile power unit in the second configuration includes the gas turbine engine driving an electrical generator to provide electrical power with the electrical generator connected to the drive shaft. Interchanging the first mobile power unit between the first and second configurations includes changing the pump or the electrical generator for the other of the pump and the electrical generator.
- In embodiments, operating the first mobile power unit in the second configuration includes providing electrical power to a blender unit, a hydration unit, or a chemical additive unit of a well pad or providing electrical energy to auxiliary equipment of the second mobile power unit.
- In some embodiments, interchanging the first mobile power unit between the first configuration and the second configuration may include disconnecting the pump form an output flange of the drive shaft, lifting a first skid including the pump from a drive equipment receiver of a transportation platform of the first mobile power unit, installing a second skid including the electrical generator into the drive equipment receiver, and connecting the electrical generator to the output flange of the drive shaft. The first skid may be lifted with a crane or a forklift and may occur at a well pad.
- In yet another embodiment of the present disclosure, a method of controlling a well pad includes controlling a first mobile power unit, a second mobile power unit, and a blender unit, a hydration unit, or a chemical additive unit with a supervisory control unit. The first mobile power unit includes a gas turbine engine driving an electrical generator. The second mobile power unit includes a gas turbine engine driving a hydraulic fracturing pump. The blender unit, hydration unit, or chemical additive unit receives electrical power from the first mobile power unit.
- To the extent consistent, any of the embodiments or aspects described herein may be used in conjunction with any or all of the other embodiments or aspects described herein.
- The accompanying drawings, which are included to provide a further understanding of the embodiments of the present disclosure, are incorporated in and constitute a part of this specification, and together with the detailed description, serve to explain the principles of the embodiments discussed herein. The present disclosure may be more readily described with reference to the accompanying drawings.
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FIG. 1 is a schematic view of a well pad layout according to an embodiment of the disclosure. -
FIG. 2 is a table illustrating exemplary power consumption of pumps of a blender unit according to an embodiment of the disclosure. -
FIG. 3 is a perspective view of a mobile power unit according to an embodiment of the disclosure. -
FIG. 4 is a schematic view of the mobile power unit ofFIG. 3 driving a fracturing pump according to an embodiment of the disclosure. -
FIG. 5 is a schematic view of the mobile power unit ofFIG. 3 driving a generator according to an embodiment of the disclosure. -
FIG. 6 is schematic view of a mobile power unit driving a reciprocating fracturing pump according to an embodiment of the present disclosure. -
FIG. 7 is schematic view of a mobile power unit driving a reciprocating fracturing pump including a torsional vibration dampener and torque sensor according to an embodiment of the present disclosure. -
FIG. 8 is schematic view of a mobile power unit driving a generator including a torsional vibration dampener and torque sensor according to an embodiment of the present disclosure. -
FIG. 9 is an exploded perspective view, with parts separated, of an alternator of an electrical generator of a mobile power unit ofFIG. 8 according to an embodiment of the present disclosure. -
FIG. 10 is a flow chart of a method of changing drive equipment of a mobile power unit according to an embodiment of the disclosure. -
FIG. 11 is a flow chart of a method of controlling a well pad according to an embodiment of the disclosure. -
FIG. 12 is a flow chart of a method of changing drive equipment of a mobile power unit according to an embodiment of the disclosure. - The present disclosure will now be described more fully hereinafter with reference to example embodiments thereof with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. These example embodiments are described so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Features from one embodiment or aspect may be combined with features from any other embodiment or aspect in any appropriate combination. For example, any individual or collective features of method aspects or embodiments may be applied to apparatus, product, or component aspects or embodiments and vice versa. The disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. As used in the specification and the appended claims, the singular forms “a,” “an,” “the,” and the like include plural referents unless the context clearly dictates otherwise. In addition, while reference may be made herein to quantitative measures, values, geometric relationships or the like, unless otherwise stated, any one or more if not all of these may be absolute or approximate to account for acceptable variations that may occur, such as those due to manufacturing or engineering tolerances or the like.
- Embodiments of the present disclosure are directed to mobile power units and associated methods that may include interchangeable drive equipment. Specifically, mobile power units may include an engine that is coupled to drive equipment such that the drive equipment is driven by the engine. The drive equipment may be a hydraulic fracturing pump or an electrical generator that is interchangeable in the field to allow for a quick changeover between providing high pressure fluid with the fracturing pump and providing electrical power with the electrical generator or vice versa depending on the demands of the well pad.
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FIG. 1 illustrates an exemplarywell pad layout 1000 that is provided in accordance with an embodiment of the present disclosure. Thewell pad layout 1000 includes a plurality ofmobile power units 100 arranged around awellhead 10 to supply thewellhead 10 with high-pressure fracturing fluids and recover oil and/or gas from thewellhead 10 as will be understood by those skilled in the art. As shown, some of themobile power units 100, e.g.,mobile power units 100 a, drive ahydraulic fracturing pump 200 that provides high pressure fluid to a manifold 20 such that the high pressure fluid is provided to thewellhead 10. - Additionally, some of the
mobile power units 100, e.g.,mobile power units 100 b, drive anelectrical generator 300 that provides electrical power to thewell pad layout 1000. For example, thewell pad layout 1000 may include auxiliary orbackside equipment 400, as will be understood by those skilled in the art, that requires electrical power to provide fluids to the manifold 20 or thewellhead 10. Specifically, thebackside equipment 400 of thewell pad layout 100, for example, may include ablender unit 410, ahydration unit 420, or a chemicaladditive unit 430. Each of theunits units respective unit units units units units - As also shown in
FIG. 2 , in an embodiment, the electrical power requirements of theunits wellhead 10, having a maximum anticipated flow rate of 125 barrels per minute (BPM). For example, if pumps of ablender unit 410 are to be electrified, the electrical power demands of the pumps of theblender unit 410 may be calculated based on a maximum anticipated flow rate of the well pad or the fracturing site. Given the maximum anticipated flow rate of 125 BPM, the table ofFIG. 2 illustrates exemplary calculations of the power demands of pumps of theblender unit 410. As shown, theblender unit 410 may include a suction pump 412, a discharge pump 414, and multiple chemical pumps 416. The chemical pumps 416 may be included on theblender unit 410 or the chemicaladditive unit 430. The maximum flow rate of 125 BPM converts to a maximum flow rate of 5250 gallons per minute (GPM) through theblender unit 410. With such a flow rate, a suction pump 412 of theblender unit 410 may operate at 1250 revolutions per minute (RPM) with an output pressure of 30 pounds per square inch (psi) such that with an eighty percent efficiency of the suction pump 412, the suction pump 412 may be sized as a 115 horsepower electrical pump. Such a 115 horsepower pump, for example, may have an electrical draw of 86 kilowatts (kW) as will be understood by those skilled in the art. Given a motor efficiency of eighty percent, however, an electrical driving motor for the suction pump 412 may have an electrical draw of 110 kW. Repeating this calculation for the discharge pump 414 results in an electrical draw of 750 kW for the motor driving the discharge pump 414. Similarly, the chemical pumps 416 may have an electrical draw of 1 kW. In addition, theblender unit 410 also may include other auxiliary components that require electrical power including, but not limited to, sand augers, air compressors, and PLC controllers. The power requirements for these auxiliary components of theblender unit 410 may require 250 kW of electrical power. Thus, the total electrical power to run theblender unit 410 at the maximum flow rate of 125 BPM is 1,100 kW. This process may be repeated for ahydration unit 420 which may have an electrical power requirement of 690 kW. Thus, for example, the total electrical requirement to run theunits mobile power unit 100 including anengine 120 producing 5100 horsepower may be converted by anelectrical generator 300 to produce 3,800 kW of electrical power which would be more than sufficient to provide electrical power for theunits - In some embodiments, it also may be desirable to electrify the auxiliary equipment of the
mobile power units 100, e.g.,mobile power units 100 a. The auxiliary equipment of themobile power units 100 a, for example, may include, but not be limited to, fuel pumps, cooling pumps, oil/lubrication pumps, cooling fans, and controllers as understood by those skilled in the art. The electrical power requirements for the auxiliary equipment of the mobile power unit may be 270 kW. As a well pad layout, e.g.,well pad layout 1000, may include eightmobile power units 100 a driving pumps, and the total electrical power requirement for electrifying the auxiliary equipment of themobile power units 100 of thewell pad layout 1000 collectively may be 2,160 kW. - If it is desired to electrify the
units mobile power units 100 b, the total electrical power requirement of thewell pad layout 1000 may be the sum of the 1,790 kW for theunits mobile power units 100 a such that the total electrical power requirement for thewell pad layout 1000 may be 3,950 kW. This electrical power requirement may be beyond the capability of a singlemobile power unit 100 b driving anelectrical generator 300. As such, were the auxiliary equipment of themobile power units 100 a also electrified, at least twomobile power units 100 b drivingelectrical generators 300 would be required. Additionally, a thirdmobile power unit 100 b driving anelectrical generator 300 may be desired for redundancy sake. The thirdmobile power unit 100 b driving anelectrical generator 300 may allow for maintenance and downtime on one of themobile power units 100 b drivingelectrical generators 300 or be available as an extramobile power unit 100 a as the drive equipment, e.g., thepump 200 orelectrical generator 300, is and field changeable as detailed below. - The
well pad layout 1000 may include asupervisory control unit 30 that monitors and controls operation of themobile power units 100 a driving fracturing pumps 200, themobile power units 100 b drivingelectrical generators 300, and theunits supervisory control unit 30 may be a mobile control unit in the form of a trailer or a van, as appreciated by those skilled in the art. In some embodiments, thesupervisory control unit 30 receives electrical power from themobile power units 100 b. -
FIG. 3 illustrates an exemplarymobile power unit 100 that is provided in accordance with an embodiment of the present disclosure. As noted above, themobile power units 100 detailed herein include agas turbine engine 120 that provides mechanical horsepower to drive equipment in the form of ahydraulic fracturing pump 200 or anelectrical generator 300. As described in greater detail below, thehydraulic fracturing pump 200 and theelectrical generator 300 are designed as modular components that may be removed and replaced with anotherpump 200 orgenerator 300 without modifying the remainder of themobile power unit 100. Such a modular design may allow for a singlemobile power unit 100 to drive apump 200 and then be changed over to drive anelectrical generator 300, or vice versa, depending on the demands of the well pad. - The exemplary
mobile power unit 100 a ofFIG. 3 includestransportation platform 110, anengine 120, and ahydraulic fracturing pump 200. Thetransportation platform 110 is shown as a single trailer with the entiremobile power unit 100 and components thereof mounted or installed thereto. For example, it may be advantageous to have the entiremobile power unit 100 mounted to a single trailer such that setup and startup of themobile power unit 100 does not require onsite assembly of themobile power unit 100. In addition, mounting the entiremobile power unit 100 to a single trailer may decrease a footprint of themobile power unit 100. Thetransportation platform 110 may be a trailer that may be pulled by a tractor (not shown) on and off public highways as will be understood by those skilled in the art. In some embodiments, the transportation platform may include more than one trailer. - The
engine 120 is mounted to thetransportation platform 110 and may be any suitable engine including, but not limited to, an internal combustion engine or a gas turbine engine. Theengine 120 may be a dual fuel engine operating on gasoline, natural gas, well gas, field gas, diesel, and/or other suitable fuel. In some embodiments, theengine 120 may be a dual fuel engine operating on a liquid fuel and a gaseous fuel. In certain embodiments, theengine 120 is a dual fuel gas turbine engine that asynchronously operates on diesel fuel, e.g., #2 diesel as will be understood by those skilled in the art, and on a gaseous fuel, e.g., natural gas, well gas, or field gas. In particular embodiments, theengine 120 is a dual fuel, dual shaft gas turbine engine that operates on a liquid fuel such as diesel fuel and a gaseous fuel such as natural gas, well gas, or field gas. -
FIGS. 4 and 5 illustrate that an embodiment of amobile power unit 100 that selectively may be provided with either a fracturing pump 200 (FIG. 4 ) or an electrical generator 300 (FIG. 5 ) that is driven by theengine 120. Thepump 200 and theelectrical generator 300 may be referred to generally as the “drive equipment.” Themobile power unit 100 includes a drive equipment position orreceiver 190 that receives and secures the drive equipment to themobile power unit 100 such that the drive equipment is driven by theengine 120 of themobile power unit 100. Themobile power unit 100 may include auxiliary equipment to support themobile power unit 100. For example, theengine 120 may include astarter 121 that is used to start theengine 120. Agearbox 130 may include agearbox lubrication pump 138 that provides lubrication to thegearbox 130. Themobile power unit 100 also may include adrive lubrication pump 180 that provides lubrication to drive equipment installed in adrive equipment receiver 190. Thedrive equipment receiver 190 may be a recess in an upper surface of thetransportation platform 110 that is sized to receive the drive equipment therein. The embodiment of themobile power unit 100 further may include other auxiliary equipment in the form of cooling or heating fans, controllers, and pumps. The auxiliary equipment of themobile power unit 100 may be driven by deck engines or may be electrified as detailed herein. - The
pump 200 and theelectrical generator 300 may be secured to askid pump 200 or theelectrical generator 300 and allows for thepump 200 or theelectrical generator 300 to be lifted from and installed or mounted within thedrive equipment receiver 190 of themobile power unit 100. Theskid skid skid drive equipment receiver 190 such that drive components and/or auxiliary equipment of thepump 200 or thegenerator 300 are aligned with the components of themobile power unit 100, e.g., theengine 120. Theskids slots respective skid pump 220 orgenerator 300, to be lifted onto or removed from thedrive equipment receiver 190 of themobile power unit 100. Theskid pump 200 or theelectrical generator 300. - In some embodiments, the
pump 200 or theelectrical generator 300 may include liftingloops pump 200 or theelectrical generator 300 by a crane or other lifting device, as would be appreciated by one skilled in the art, to be lifted onto or removed from thedrive equipment receiver 190 of themobile power unit 100. The liftingloops skids pump 200 or thegenerator 300. Having both the liftingloops pump 200 or theelectrical generator 300 in a field or in a shop environment. -
FIG. 6 schematically illustrates an embodiment of themobile power unit 100 with anengine 120 connected to apump 200 that is installed in thedrive equipment receiver 190 of themobile power unit 100. Theengine 120 includes apower end 126 that directly drives anengine output shaft 128. Theengine output shaft 128 is coupled to areduction gearbox 130 such that a speed of rotation of theengine output shaft 128 is stepped down to a speed of rotation of agearbox output shaft 134 of thegearbox 130 that is suitable for a hydraulic fracturing pump, e.g., pump 200. For example, a speed of rotation of theengine output shaft 128 of theengine 120 may be 16,500 RPM and a speed of rotation of thegearbox output shaft 134 of thegearbox 130 that is suitable for thepump 200 may be 1500 RPM such that a ratio of thereduction gearbox 130 is an 11:1 reduction. Thereduction gearbox 130, for example, in some embodiments, may have a ratio in a range of 5:1 to 20:1 depending on the specifications of theengine 120 and thepump 200 to be driven by theengine 120. It will be appreciated that as the rotation speed of theengine output shaft 128 is stepped down to the rotation speed of thegearbox output shaft 134 at the ratio of thegearbox 130 that the torque of theoutput shaft 128 is stepped up to torque of theoutput shaft 134 at the inverse of the ratio, e.g., 1:11 step up for a 11:1 step down. - The
gearbox output shaft 134 ofgearbox 130 includes anoutput flange 136 that is coupled to aninput flange 142 of adrive shaft 140 such that thedrive shaft 140 is directly driven by theengine 120 via thegearbox 130. Thedrive shaft 140 includes anoutput flange 144 that releasably and selectively may be connected to aninput shaft 250 of thepump 200 such that thepump 200 is directly driven by theengine 120 via thedrive shaft 140. -
FIG. 7 schematically illustrates an embodiment of amobile power unit 100 with theengine 120 connected to thepump 200 that is installed in thedrive equipment receiver 190 of themobile power unit 100 such that thepump 200 is driven by theengine 120 via thedrive shaft 140 in a manner as detailed above. Thedrive shaft 140 includes a torsional vibration damper (TVD)system 150 and a torque sensor 158, as will be understood by those skilled in the art. TheTVD system 150 may dampen torque variations from theengine 120 to thepump 200 and/or may dampen reaction torque variations from thepump 200 to theengine 120. TheTVD system 150 may prevent or reduce torque variations experienced by theengine 120, thegearbox 130, thedrive shaft 140, and/or thepump 200 such that a service interval or the service life of theengine 120, thegearbox 130, thedrive shaft 140, and/or thepump 200 may be extended. Thedrive shaft 140 also may include one ormore torque sensors 160 installed thereon that measure a torque of thedrive shaft 140. Thetorque sensors 160 may provide a signal to one or more controllers of themobile power unit 100, e.g., a controller of theengine 120 or a controller of thepump 200. The controllers of themobile power unit 100 or thetorque sensors 160 may provide a signal to the supervisory control unit 30 (FIG. 1 ) indicative of the torque of thedrive shaft 140. The torque of thedrive shaft 140 may be used in one or more control algorithms for theengine 120. -
FIG. 8 schematically illustrates an embodiment of amobile power unit 100 with theengine 120 connected to anelectrical generator 300 that is installed in thedrive equipment receiver 190 of themobile power unit 100 such that theelectrical generator 300 is driven by theengine 120 via thedrive shaft 140. Specifically, thegenerator 300 includes analternator 330 that rotates to generate alternating current (AC) electrical power which is suitable for theunits FIG. 1 ), the auxiliary equipment of themobile power units 100 a, or the supervisory control unit 30 (FIG. 1 ). The speed of rotation of thealternator 330 that is suitable for generation of electrical power depends on the number of poles of thealternator 330 and the frequency of the AC power as represented by the following equation: -
- where f is the output frequency in hertz (Hz), P is the number of poles, and N is the RPM of the alternator. As most electrical equipment in the United States operates at a frequency of 60 hertz (Hz), the rotational speed of the
alternator 330 to provide AC power 60 Hz, for example, may be 3600 RPM for a 2-pole configuration and 1800 RPM for a 4-pole configuration. Those skilled in the art recognize that other speeds may be suitable for rotation of thealternator 330 depending on the desired frequency of the AC power, e.g., 50 Hz or 60 Hz, or the number of poles of the alternator, e.g., 2, 4, 6, 8, 10 poles. - The
electrical generator 300 includes aninput shaft 350 that releasably couples or otherwise connects to theoutput flange 144 of thedrive shaft 140. As theelectrical generator 300 may be a selective replacement for thepump 200, and thegearbox 130 has a fixed reduction ratio in a range of 5:1 to 20:1, e.g., 11:1, based on the speed requirements of thepump 200, thedrive shaft 140 has a maximum speed of rotation of 1500 RPM. This results in the speed of rotation of thedrive shaft 140 being less that what is required by thealternator 330 of theelectrical generator 300 as detailed above with respect to a 2-pole or 4-pole configuration of thealternator 330. For this reason, theelectrical generator 300 includes a step upgenerator gearbox 360 to increase the speed of rotation of theinput shaft 350 to a speed of rotation that is suitable for theelectrical generator 300. The ratio of thegenerator gearbox 360 ratio is set based on keeping the engine running at as high of a load and speed as possible and the number of poles of theelectrical generator 300. As the input speed of thedrive shaft 140 has a maximum speed of rotation of 1500 RPM, thegenerator gearbox 310 may have a ratio of 1:2.5 which allows for the speed of rotation of theelectrical generator 300 to be 1800 RPM or 3600 RPM depending on the number of poles of thegenerator 300 installed on themobile power unit 100. However, other ratios in a range of 1:1.25 to 1:5 may be used based on a desired speed of rotation of theelectrical generator 300 as will be understood by those skilled in the art. Those skilled in the art appreciate that the speed of theengine 120 may be controlled by thesupervisory control unit 30. Including agenerator gearbox 360 which may allow for theelectrical generator 300 selectively to be changed with thepump 200 by releasably coupling or connecting to thedrive shaft 140 without changing the ratio of thereduction gearbox 130 of theengine 120. By not requiring the changing of thereduction gearbox 130 or requiring thereduction gearbox 130 to have multiple settings, one for thepump 200 and one for thegenerator 300, the efficiency of thereduction gearbox 130 may be increased and/or the complexity of changing the drive equipment may be simplified. - The
alternator 330 of theelectrical generator 300 is designed and sized based on the electrical demands of the fracturing fleet, e.g., the power demands of the well pad layout. As detailed above, when thealternator 330 is providing electrical power for theunits FIG. 1 ), the electrical power requirement is 1,790 kW, and when theengine 120 is a 5,100 horsepower engine, theengine 120 may be capable of providing 3,800 kW of energy. Thus, thealternator 330 should be sized to generate at least 1,800 kW and to be capable of generating 3,800 kW when required. For example, when auxiliary equipment of themobile power units 100 a also are provided with electrical power from one ormore generators 300. -
FIG. 9 illustrates a construction of anexemplary alternator 330 in an exploded perspective view as provided in accordance with embodiments of this disclosure. Thealternator 330 may be a permanent magnet alternator and more specifically, an AC synchronous alternator in which the stator and the rotor spin at the same speed. Such an alternator may have increased efficiency when compared to other alternators and does not require electrical power to the rotor to generate electrical power. As shown, thealternator 330 includes arotor mount 332, asolid rotor 334, astator 336, afield coil 338, and a housing 440. Therotor mount 332 is attached to an output shaft of the generator gearbox 360 (FIG. 8 ) such that therotor mount 332 rotates at the output speed of thegenerator gearbox 360. Therotor mount 332 may include ablower 333 that includes vanes to direct fluid flow within thealternator 330 to cool internal components of thealternator 330. Therotor 334 is mounted to therotor mount 332 such that therotor 334 is rotatably fixed to therotor mount 332. Therotor 334 may be a solid rotor and includespermanent magnets 335 mounted therein. Therotor 334 may include 12permanent magnets 335 which may be NdFeB magnets, for example, as will be understood by those skilled in the art. Thestator 336 is mounted to therotor mount 332 within therotor 334 such that thestator 336 rotates in concert with therotor 334. Thestator 336 may be a 6-phase stator, for example. Thefield coil 338 is mounted to thehousing 340 about thestator 336 such that as therotor 334 and thestator 336 rotate, AC power is transferred toterminals 342 of thehousing 340. Thehousing 340 is disposed over therotor mount 332, thesolid rotor 334, thestator 336, and thefield coil 338 such that therotor mount 332, thesolid rotor 334, thestator 336, and thefield coil 338 rotate within thehousing 340. - As shown in
FIG. 5 , embodiments of thealternator 330 also may require acooling system 370 to cool internal components of thealternator 330. In some embodiments, thecooling system 370 includes acoolant pump 372 that circulates fluid through thealternator 330 to cool internal components thereof. The fluid may be air or glycol water, as will be understood by those skilled in the art. In certain embodiments, thecooling system 370 of thealternator 330 is self-sufficient such that thecooling system 370 is powered by thealternator 330 when thealternator 330 generates electrical power. In particular embodiments, thecooling system 370 of thealternator 330 requires external power to power thecooling system 370. In such embodiments, thecooling system 370 may be powered by alubrication system 180 of the mobile power unit 100 (FIG. 4 ) that is configured to cool thepump 200 when thepump 200 is installed on themobile power unit 100. Thelubrication system 180 may include a changeover valve to be compatible with thecooling pump 372 of thegenerator 300. Thecooling system 370 may require acoolant storage tank 374 which may be mounted to theskid 320 or thealternator 330 such that thecooling system 370 and the coolant storage tank is part of theelectrical generator 300 and is installed with theelectrical generator 300. -
FIG. 10 illustrates amethod 1001 of changing a power device of a mobile power unit in accordance with exemplary embodiments of the present disclosure with reference to the mobile power unit ofFIGS. 3-5 . As described in greater detail below, themethod 1001 includes amobile power unit 100 driving apump 200 in a first configuration (Step 1010), anelectrical generator 300 in a second configuration (Step 1020), and changing thepump 200 or theelectrical generator 300 for the other of thepump 200 or the electrical generator 300 (Step 1100). Themethod 1001 may include receiving a signal indicative of an electrical demand, an electrical supply, a fluid requirement, or a fluid supply of a well pad site. Changing themobile power unit 100 between the first configuration and the second configuration may occur at least in part as a result of analyzing or determining that the electrical demand of the well pad site is greater than the electrical supply, that a fluid supply is greater than a fluid requirement of the well pad site, that an electrical supply is greater than an electrical demand of the well pad site, or that the fluid requirement of the well pad site is greater than the fluid supply. - In the first configuration, a
gas turbine engine 120 of themobile power unit 100 drives thepump 200 to provide high pressure fluid (Step 1010). Thepump 200 is connected to adrive shaft 140 of themobile power unit 100. Thedrive shaft 140 may have a maximum speed of rotation in a range of 1000 RPM to 1700 RPM. Operating themobile power unit 100 in the first configuration may include operating thegas turbine engine 120 on field gas, for example. - The
method 1001 may include selectively interchanging thepump 200 of themobile power unit 100 for the electrical generator 300 (Step 1100). Interchanging thepump 200 for theelectrical generator 300 may include disconnecting thepump 200 from anoutput flange 144 of the drive shaft 140 (Step 1110) before lifting askid 220 that includes thepump 200 from adrive equipment receiver 190 of atransportation platform 110 of the mobile power unit 100 (Step 1120). Lifting theskid 220 may include lifting theskid 200 with a crane or a forklift. With thepump 200 removed, askid 320 including theelectrical generator 300 is installed into thedrive equipment receiver 190 of the transportation platform 110 (Step 1130). With theskid 320 installed in thedrive equipment receiver 190, theelectrical generator 300 is connected to theoutput flange 144 of the drive shaft 140 (Step 1140). Interchanging thepump 200 for theelectrical generator 300 may occur at a well pad or at a plant. - With the
electrical generator 300 connected to theoutput flange 144, themobile power unit 100 is operated in a second configuration in which thegas turbine engine 120 drives the electrical generator 300 (Step 1020), e.g., instead of thepump 200, to provide electrical power. In the second configuration, themobile power unit 100 may provide electrical power to ablender unit 410, ahydration unit 420, or a chemicaladditive unit 430 of awell pad 1000. Additionally or alternatively, in the second configuration, themobile power unit 100 may provide electrical power to auxiliary equipment of anothermobile power unit 100 which includes agas turbine engine 120 driving ahydraulic fracturing pump 200. Operating themobile power unit 100 in the second configuration may include operating thegas turbine engine 120 on field gas. - In the second configuration, the
method 1001 may include monitoring and controlling the electrical generator of the firstmobile power unit 100 with a supervisory control unit 30 (FIG. 1 ). As described in greater detail below with respect tomethod 1200, thesupervisory control unit 30 may monitor and control delivery of a high pressure fluid of a second mobile power unit having a gas turbine engine driving a pump simultaneously with monitoring and controlling the first mobile power unit in the second configuration. - The
method 1001 may include selectively interchanging theelectrical generator 300 of themobile power unit 100 for the pump 200 (Step 1150). Interchanging theelectrical generator 300 for thepump 200 may include disconnecting theelectrical generator 300 from theoutput flange 144 of the drive shaft 140 (Step 1160) before lifting askid 220 that includes theelectrical generator 300 from adrive equipment receiver 190 of atransportation platform 110 of the mobile power unit 100 (Step 1170). Lifting theskid 220 may include lifting theskid 200 with a crane or a forklift. With theelectrical generator 300 removed, askid 220 including thepump 200 is installed into thedrive equipment receiver 190 of the transportation platform 110 (Step 1180). With theskid 220 installed in thedrive equipment receiver 190, thepump 200 is connected to theoutput flange 144 of the drive shaft 140 (Step 1190). Interchanging theelectrical generator 300 for thepump 200 may occur at a well pad or at a plant. -
FIG. 11 shows amethod 1200 of controlling a well pad in accordance with exemplary embodiments of the present disclosure with reference to thewell pad 1000 ofFIG. 1 . Themethod 1200 includes operating asupervisory control unit 30 to control a firstmobile power unit 100, to control a secondmobile power unit 100, and to control ablender unit 410, ahydration unit 420, or a chemicaladditive unit 430. - Operating the
supervisory control unit 30 includes receiving operating parameters of thewell pad 1000 at the supervisory control unit 30 (1210). In response to receiving operating parameters, thesupervisor control unit 30 provides control signals to the firstmobile power unit 100 to control the first mobile power unit 100 (Step 1230), provides control signals to the second mobile power unit 100 (Step 1250), and provides control signals to theblender unit 410, thehydration unit 420, or the chemical additive unit 430 (Step 1270). - The
supervisory control unit 30 may receive feedback signals from first mobile power unit 100 (Step 1220) and may modify control signals provided to the firstmobile power unit 100 in response to the feedback signals (Step 1240). For example, thesupervisory control unit 30 may change a supply of air or fuel to thegas turbine engine 120 such that thegas turbine engine 120 changes power delivery to theelectrical generator 300 based on energy demands of thewell pad 100. Thesupervisory control unit 30 may calculate energy demands of thewell pad 1000 by monitoring or receiving feedback from the firstmobile power unit 100, the secondmobile power unit 100, and ablender unit 410, ahydration unit 420, or a chemicaladditive unit 430. In some embodiments, themethod 1200 may include the firstmobile power unit 100 providing power to a supervisory control vehicle that includes thesupervisory control unit 30. - The
supervisory control unit 30 may receive feedback signals from the second mobile power unit 100 (Step 1220) and may modify control signals provided to the secondmobile power unit 100 in response to the feedback signals (Step 1260). For example, thesupervisory control unit 30 may change the supply of air or fuel to thegas turbine engine 120 of the secondmobile power unit 100 to change an amount or pressure of a high pressure fluid from thepump 200 in response to the feedback signals of the secondmobile power unit 100. - The
supervisory control unit 30 may receive feedback signals from theblender unit 410, thehydration unit 420, or the chemical additive unit 430 (Step 1220) and may modify control signals provided to theunits supervisory control unit 30 may change an amount of fluid provided to thepump 200 by arespective one units supervisory control unit 30 may control theunits electrical generator 300 of the firstmobile power unit 100. -
FIG. 12 illustrates amethod 1300 of changing drive equipment of a mobile power unit in accordance with exemplary embodiments of the present disclosure with reference to the mobile power unit ofFIGS. 3-5 . Themethod 1300 includes operating amobile power unit 100 in a first configuration (Step 1310), receiving one or more signals indicative of an electrical demand or fluid requirements of a well pad site (Step 1320), determining that the electrical demand of thewell pad site 1000 is greater than an electrical supply or that a fluid capacity is greater than the fluid requirements (Step 1330), and interchanging the firstmobile power unit 100 from a first configuration to a second configuration (Step 1340). - Operating the first
mobile power unit 100 in the first configuration (Step 1310) includes the firstmobile power unit 100 driving apump 200 to provide high pressure fluid to thewell pad site 1000. Themobile power unit 100 includes agas turbine engine 120 that drives thepump 200 to provide the high pressure fluid. Thepump 200 is connected to adrive shaft 140 of themobile power unit 100 which has areduction gearbox 130 such that thedrive shaft 140 may have a maximum speed of rotation in a range of 1000 RPM to 1700 RPM. Operating themobile power unit 100 in the first configuration may include operating thegas turbine engine 120 on field gas, for example. - When the first
mobile power unit 100 is operating in the first configuration, asupervisory control unit 30 of thewell pad site 1000 receives demand signals from equipment of thewell pad site 1000 and input from the operators at thewell pad site 1000 that are indicative of an electrical demand and fluid requirements of the well pad site 1000 (Step 1320). In addition, thesupervisory control unit 30 may receive performance signals from equipment of the well pad site 1000 (e.g.,mobile power units 100, pumps 200,generators 300, orauxiliary units supervisory control unit 30 may display the electrical demand and the fluid requirements of thewell pad site 1000 and display the current electrical supply and fluid supply of thewell pad site 1000 based on the signals received. - The operator or the
supervisory control unit 30 may compare the electrical demand to the electrical supply or the fluid requirements to the fluid capacity (Step 1330). When the operator or thesupervisory control unit 30 determines that the electrical demand of thewell pad site 1000 is greater than the electrical supply or that the fluid capacity is greater than the fluid requirements, the firstmobile power unit 100 may be interchanged from the first configuration to a second configuration (Step 1340). The decision to interchange the firstmobile power unit 100 may be made to optimize electrical supply or fluid capacity or to allow for maintenance of othermobile power units 100. When the electrical demand is less than the electrical supply and the fluid capacity is less than the fluid requirements, the firstmobile power unit 100 may remain in the first configuration. - When the first
mobile power unit 100 is interchanged to the second configuration, thepump 200 of the firstmobile power unit 100 is changed for an electrical generator 300 (Step 1350). In the second configuration, theelectrical generator 300 is connected to thedrive shaft 140 to produce electrical energy for thewell pad site 1000. Theelectrical generator 300 includes agenerator gearbox 360 to at least partially offset thereduction gearbox 130. Theelectrical generator 300 may provide electrical power to auxiliary units such as ablender unit 410, ahydration unit 420, or a chemicaladditive unit 430. - When the first
mobile power unit 100 is operating in the second configuration, thesupervisory control unit 30 of thewell pad site 1000 may continue to receive demand signals from equipment of thewell pad site 1000 and input from the operators at thewell pad site 1000 that are indicative of an electrical demand and fluid requirements of the well pad site 1000 (Step 1360). In addition, thesupervisory control unit 30 may receive performance signals from equipment of the well pad site 1000 (e.g.,mobile power units 100, pumps 200,generators 300, orauxiliary units supervisory control unit 30 may display the electrical demand and the fluid requirements of thewell pad site 1000 and display the current electrical supply and fluid supply of thewell pad site 1000 based on the signals received. - The operator or the
supervisory control unit 30 may compare the electrical demand to the electrical supply or the fluid requirements to the fluid capacity (Step 1370). When the operator or thesupervisory control unit 30 determines that the fluid requirements of thewell pad site 1000 is greater than the fluid capacity or that the electrical supply is greater than the electrical demand, the firstmobile power unit 100 may be interchanged from the first configuration to a second configuration (Step 1380). The decision to interchange the firstmobile power unit 100 may be made to optimize electrical supply or fluid capacity or to allow for maintenance of othermobile power units 100. When the fluid requirement is less than the fluid capacity and the electrical supply is less than the electrical demand, the firstmobile power unit 100 may remain in the second configuration. - When the first
mobile power unit 100 is interchanged to the first configuration, theelectrical generator 300 of the firstmobile power unit 100 is changed for a pump 200 (Step 1390). As detailed above, in the first configuration, thepump 200 is connected to thedrive shaft 140 to produce fluid capacity for thewell pad site 1000. Interchanging the firstmobile power unit 100 between the first configuration and the second configuration may occur at awell pad site 1000. - This is a divisional of U.S. Non-Provisional application Ser. No. 17/301,305, filed Mar. 31, 2021, titled “DRIVE EQUIPMENT AND METHODS FOR MOBILE FRACTURING TRANSPORTATION PLATFORMS,” which claims priority to and the benefit of, under 35 U.S.C. § 119(e), U.S. Provisional Application No. 62/705,055, filed Jun. 9, 2020, titled “DRIVE EQUIPMENT AND METHODS FOR MOBILE FRACTURING TRANSPORTATION PLATFORMS,” the disclosures of which are incorporated herein by reference in their entireties.
- The foregoing description of the disclosure illustrates and describes various exemplary embodiments. Various additions, modifications, changes, etc., may be made to the exemplary embodiments without departing from the spirit and scope of the disclosure. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. Additionally, the disclosure shows and describes only selected embodiments of the disclosure, but the disclosure is capable of use in various other combinations, modifications, and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, commensurate with the above teachings, and/or within the skill or knowledge of the relevant art. Furthermore, certain features and characteristics of each embodiment may be selectively interchanged and applied to other illustrated and non-illustrated embodiments of the disclosure.
Claims (8)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US17/377,884 US11174716B1 (en) | 2020-06-09 | 2021-07-16 | Drive equipment and methods for mobile fracturing transportation platforms |
US17/460,788 US11643915B2 (en) | 2020-06-09 | 2021-08-30 | Drive equipment and methods for mobile fracturing transportation platforms |
US17/460,754 US20210388706A1 (en) | 2020-06-09 | 2021-08-30 | Drive equipment and methods for mobile fracturing transportation platforms |
US18/118,870 US20230212932A1 (en) | 2020-06-09 | 2023-03-08 | Drive equipment and methods for mobile fracturing transportation platforms |
Applications Claiming Priority (3)
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- 2021-08-30 US US17/460,754 patent/US20210388706A1/en active Pending
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US11746637B2 (en) * | 2019-09-20 | 2023-09-05 | Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. | Adaptive mobile power generation system |
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CA3114305A1 (en) | 2021-12-09 |
US11643915B2 (en) | 2023-05-09 |
US20230212932A1 (en) | 2023-07-06 |
US11174716B1 (en) | 2021-11-16 |
US20210388706A1 (en) | 2021-12-16 |
US11111768B1 (en) | 2021-09-07 |
US20210388707A1 (en) | 2021-12-16 |
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