EP3548744B1 - A plant for controlling delivery of pressurized fluid in a conduit, and a method of controlling a prime mover - Google Patents
A plant for controlling delivery of pressurized fluid in a conduit, and a method of controlling a prime mover Download PDFInfo
- Publication number
- EP3548744B1 EP3548744B1 EP17840454.7A EP17840454A EP3548744B1 EP 3548744 B1 EP3548744 B1 EP 3548744B1 EP 17840454 A EP17840454 A EP 17840454A EP 3548744 B1 EP3548744 B1 EP 3548744B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- prime mover
- plant
- fluid delivery
- conduit
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000012530 fluid Substances 0.000 title claims description 56
- 238000000034 method Methods 0.000 title claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 22
- 239000000446 fuel Substances 0.000 claims description 10
- 230000003993 interaction Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
- F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
-
- 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
-
- 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
-
- 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
- F04B17/06—Mobile combinations
-
- 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
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
- F04B47/04—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level the driving means incorporating fluid means
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
Definitions
- the invention concerns a method of controlling a prime mover which is configured to drive one or more fluid delivery systems for delivering a fluid in a conduit, and an associated plant, as set out by the preambles in claims 1 and 6, respectively.
- the invention is particularly useful in the extraction of shale oil and/or gas by means of pressure pumping equipment for well stimulation, commonly known as “hydraulic fracturing” or “fracking", but is not limited to such operations.
- a typical pressure pump comprises two major parts: a "fluid end” and a “power end”.
- the fluid end is the actual pressure pump, pressurizing the fracturing fluid. It is normally a plunger/piston pump, typically operating at 150-300 strokes per minute, and is an exchangeable unit.
- the power end is part of the drivetrain, and it is connected to a multi-speed transmission.
- the power end has a reduction gear box on the inlet, and is connected to the plunger on the fluid end via a crankshaft and a crosshead.
- the power is normally provided by a reciprocating engine, although gas turbine engines are also used.
- the prior art includes CN 104806220 A , which describes "fully-hydraulic driven" fracturing equipment with a power unit and a fracturing pump.
- the power unit comprises an engine unit, a transfer case unit and a hydraulic pump unit. Three hydraulic pumps are installed on each transfer case, and the hydraulic pump unit is connected through hydraulic pipelines.
- the fracturing pump comprises a left and a right pump head; three two-way hydraulic oil cylinders which are arranged in parallel are installed on the fracturing pump.
- the fracturing pump is driven by the two-way hydraulic oil cylinders, so that the equipment power is increased, the equipment discharge flow is increased; the equipment weight and size are reduced.
- the prior art also includes CN 104727797 A and CN 204552723 U , which describe a system where an engine, a transfer case, a plurality of variable displacement plunger pumps and a double-acting fracturing pump are arranged on a chassis.
- the output end of the engine is connected with the input end of the transfer case, and the output end of the transfer case comprises a plurality of power take-off ports.
- Each power take-off port is connected with one variable displacement plunger pump.
- the plunger pumps drive the double-acting fracturing pump through a hydraulic system.
- the prior art also includes CN 104728208 A , which describes a high-power hydraulic driving fracturing-pump pump station system, in which the hydraulic cylinders are connected with the fracturing cylinders.
- Electric motor driven hydraulic pump provides high-pressure oil and fluid outlet manifold outputs a high-pressure fracturing fluid.
- the prior art also includes CN 104453825 A , which describes a modularized fracturing pump set which comprises a power unit and a fracturing pump unit.
- An auxiliary engine is arranged on the power unit and is connected to a hydraulic pump.
- a torque converter is arranged in the fracturing pump, and the input end of the torque converter is connected to the main engine.
- the output end of the torque converter is connected to a gearbox, and the output end of the gearbox is connected to the fracturing pump.
- WO 2014/078236 A1 describes a turbo-shaft engine having a drive shaft and a high pressure, and a high-RPM centrifugal pump coupled to the drive shaft.
- US 4470771 A discloses quadraplex pumping unit for use as a mud pump, an intensifier, or as a pump for abrasive fluids or the like.
- the pumping unit includes four rams and four ram operating pistons.
- a control valve arrangement provides for pressure equalization and energy transfer from a cylinder which has just extended in a working stroke to a companion cylinder which has just returned to its retracted to rest position, to conserve energy and reduce the thermal burden on the hydraulic system.
- the valve arrangement further provides for prepressurization, after pressure equalization, prior to an extending stroke.
- US 2005/006089 A1 discloses a method and apparatus for fracturing a subterranean formation.
- a centrifugal pump is used to combine a fracture fluid, a sand suspension and liquid additive and discharge a mixture of these components into a high pressure pump that injects the mixture into the subterranean formation.
- the apparatus employs a control pinch valve to precisely control the amount of sand suspension being added to the mixture.
- US 3722595 A discloses a fracturing method wherein an emulsified fluid is injected into a subterranean formation under sufficient pressure to open a fracture in the formation.
- the fracturing method is performed by continuously passing the liquid used as the external phase through a conduit to establish a turbulent flow stream, introducing the liquid used as the internal phase into the flow stream at a plurality of locations to progressively increase the concentration of the internal phase, and continuously injecting the emulsion into the formation under sufficient pressure to open a fracture therein.
- the method can be employed in water external or oil external systems.
- US 2014/010671 A1 discloses a hydraulic pump powering system which includes a mobile vehicle, a first electric current generator device, and one or more electric pump motors.
- the mobile vehicle has first and second prime movers.
- the first electric current generator device is disposed onboard the mobile vehicle and is configured to be mechanically coupled with the first prime mover to convert movement created by the first prime mover into first electric current.
- the one or more electric pump motors are configured to receive the first electric current to power a hydraulic pump.
- the second prime mover is configured to generate movement that is converted into a propulsive force that propels the mobile vehicle.
- the one or more electric pump motors are configured to receive the first electric current in order to power the hydraulic pump to pump a fluid into a pumping location located off-board the mobile vehicle.
- a plant for controlling the delivery of a pressurized fluid in a conduit comprising a prime mover which is configured to supply torque to one or more hydraulic pumps, characterized by each hydraulic pump configured to supply hydraulic pressure to respective positive displacement fluid delivery systems, each positive displacement fluid delivery system configured to deliver said fluid in the conduit, - first sensing means configured for sensing pressure variations in the conduit and connected to a first controller; the first controller being configured to provide control signals to the control valves for at least one fluid delivery system and to a control system for the prime mover, based on said sensed pressure variations.
- the plant may comprise one or more hydraulic pumps configured to communicate with control means and to operate said fluid delivery systems and being driven by the prime mover, whereby the interaction between the hydraulic pumps and the prime mover is controlled based on sensed pressure variations in the conduit.
- the plant further comprises valve outlet feedback pressure sensors connected to respective control valves, and a valve inlet pressure sensor connected to the control valve.
- the plant may further comprise a valve controller configured for receiving signals from the pressure sensors and the first sensing means, position feedback from the positive displacement fluid delivery systems, and configured for providing control signals to the control valves.
- the prime mover may be a gas turbine engine.
- a gear unit may be arranged between the gas turbine engine and the hydraulic pump.
- the prime mover is a reciprocating engine.
- the at least one positive displacement fluid delivery system may comprise a positive displacement pump.
- the method may further comprise determining an estimated power consumption.
- the method comprises controlling the prime mover fuel supply by variations in the sensed pressure.
- the at least one positive displacement fluid delivery system may be controlled based on a set-point (rate/pressure) identified and set by an operator or an overall control system.
- a first controller may provide control signals to hydraulic pumps, configured to operate said fluid delivery systems and being driven by the prime mover, whereby the interaction between the hydraulic pumps and the prime mover is controlled based on sensed pressure variations in the conduit.
- the invented plant may be placed on a mobile unit, for example a trailer.
- the invention is particularly useful in hydraulic fracturing ("fracking") operations, it is also applicable for all positive displacement pumping processes in which control is based on a flow and pressure-setting an feedback pressures.
- the invention shall therefore not be limited to fracking operations.
- the invented plant is in this illustrated embodiment arranged as a mobile unit 18 on a trailer 19 and enclosed by a housing 20. Doors in the housing provide access to the plant, and rear doors allow the movable unit comprising the fluid end 21 with its double-acting cylinders 22 to be moved out and down (see figure 3 ) when the plant is in operation. Pipes 21a are configured for connection to well piping (not shown).
- the mobile plant comprises in the illustrated embodiment a gas turbine 26, connected via a duct 27a to an air inlet 27, and an exhaust opening 26a.
- the gas turbine receives fuel from the fuel tank 32.
- Supply lines and hoses, power lines and control lines, etc., are not shown, as these components are commonly known in the art.
- the gas turbine 26 is connected to a set of single or tandem-mounted hydraulic pumps 30 via a gearbox 28.
- Reference numbers 31 and 29 denote a hydraulics tank and accumulator tanks, respectively.
- Louvers and air filtration container 23 is arranged towards the read of the mobile unit, behind oil cooler gearbox 25 and hydraulics 24.
- the hydraulic pumps 30 operate double-acting cylinders 22 in the plant's fluid ends 21. Each hydraulic cylinder operates one plunger, in each of the plant's two fluid ends.
- figure 1 three systems are shown; denoted A, B, C, respectively. It should be understood that only system C is illustrated in detail in figure 1 , for clarity of illustration. The skilled person will understand that the components and functions illustrated and described with reference to system C, also can be applied to systems A and B. It should also be understood that the invention shall not be limited to the number of systems shown in figure 1 .
- Reference number 1 denotes a power source, which comprises a prime mover 2.
- the prime mover may be a gas turbine engine or a reciprocating engine, controlled via a throttle 3 (controlling fuel supply F and receiving information regarding rotation speed R).
- the prime mover 2 is connected, and configured to transfer torque T, to a gear unit 8.
- the gear unit 8 transfers torque T' to individual hydraulic pumps 9a-c; each pump having respective pump pressure sensors 13a-c.
- the gear unit 8 may be configured to reduce high-rpm output from the turbine. If the prime mover is of another type of engine (e.g. a reciprocating engine), the hydraulic pumps may be driven directly by the engine, and the gear unit 8 may be omitted.
- the prime mover is of another type of engine (e.g. a reciprocating engine)
- the hydraulic pumps may be driven directly by the engine, and the gear unit 8 may be omitted.
- Each hydraulic pump 9a-c supplies hydraulic pressure to respective positive displacement fluid delivery systems, in the illustrated embodiment double-acting hydraulic cylinders 34a-c, via respective control valves 36a-c, 37a-c.
- a reservoir tank 11 and a cooler 17 are fluidly connected between the hydraulic pump 9c and the control valves 36c, 37c.
- the circuit also comprises an accumulator 33, for mitigating pressure pulses.
- Each hydraulic cylinder 34a-c is drivingly connected to respective sets of fluid plungers 35al-cl, 35a2-c2.
- the fluid plungers 35al-cl, 35a2-c2 supply fluid to the well via the fluid supply line 10.
- the invention shall, however, not be limited to such fluid plungers.
- Reference number 12 denotes a suction line from a fluid blending system (not shown).
- Well feedback pressure sensor 16 is connected to, and configured to sense the pressure in (and hence pressure variations), the supply line 10.
- Valve outlet feedback pressure sensors 15 are connected to respective control valves 36c, 37c.
- Valve inlet pressure sensor 14 is connected to control valve 36c.
- a valve controller 7 typically a programmable logic controller - PLC receives signals from the pressure sensors 14, 15, 16, position feedback Cp from the hydraulic cylinders, and provides control signals Vf to the control valves 36c, 37c.
- a main control system 4 controls the throttle 3 based on power request Pr and provides power feedback Pf.
- the main control system 4 also receives transport security interlock feedback Ts from the gear unit 8, and estimated power consumption data EPC from the PLC 7, based on the sensed pressure variations by well feedback pressure sensor 16.
- a louver controller 5 is also in communication with the main control system 4, to open and close louvers (for e.g. ventilation and fire control).
- the main control system 4 receives data from a hydraulic pump controller 6 (e.g. a PLC) and provides a power command Ac to the hydraulic pump controller 6.
- the hydraulic pump controller 6 in turn provides the required displacement command Dc to the hydraulic pump 9c based on pump pressure feedback Pp (from the pressure sensor 13c).
- the main control system 4 also provides data regarding requested cylinder speed RCS to the valve controller 7, which in turn determines and provides the valve flow control signal Vf to the control valves 36c, 37c, as described above.
- the invention thus comprises a hydraulic-pressure/flow-controlled power transmission, in which all power from the prime mover is transformed into hydraulic power by the hydraulic pumps.
- the hydraulic pumps enable the prime mover to start against little or no load.
- the prime mover 2 and the hydraulic pumps 9a-c operate the hydraulic cylinders 34a-c and fluid plungers 35al-cl, 35a2-c2 to supply pressurized fracturing fluid to the line 10 (and thus the subterranean well).
- the hydraulic fracturing pressure generated in the well is a result of the well pressure and the hydraulic pressure generated by the plungers.
- the well pressure (which is sensed by the sensor 16) is communicated to the valve controller PLC 7, which controls the control valves 36a-c, 37a-c and also determines the estimated power consumption EPC, which is transmitted to the main control system 4.
- the prime mover fuel supply e.g.
- the turbine fuel injection may thus be governed by the well pressure, or rather the variations in pressure, as sensed continuously by the sensor 16.
- the blazing turbine fuel control receives pressure reading from the hydraulic control system, based on the pressure and rate reading from the hydraulic fracturing pressure.
- the hydraulic control system then performs a control action based on a set-point (rate/pressure) identified and set by the operator.
- the “delay” which is inherent in the hydraulic components, or as controlled by the main control system 4, provides sufficient time for the turbine fuel control to "predict” what is going to happen, and take action before it happens.
- the prime mover can - before the requirement arises - either increase the fuel injection (open throttle) to be ready for the higher demand from the hydraulic pumps, or lower the fuel injection (restrict throttle) to adapt to the estimated future requirement of torque, and thereby accommodate the change in rate/pressure.
- This function is particularly useful in embodiments where the prime mover is a gas turbine engine, as such turbines normally operate at high rotational speeds, and have low torque.
- the control system may in this fashion prevent the gas turbine engine from over-speeding, and further give the gas turbine engine a head-start on a predicted increased torque demand.
- valve controller 7 and pressure sensor 16 are sensing this, based on sensed pressure variations.
- the set point may also be defined based on a prioritized list, defined by an overall control system, of how deviating conditions are to be handled. Based on rate/pressure difference between the set point and the actual pressure reading (as sensed by 16), there will occur a situation that the actual power command Ac (fed to main controller 4 by the pump controller 6) differs from (less or more) the estimated power consumption EPC (fed to the main controller 4 by the valve controller 7).
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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Description
- The invention concerns a method of controlling a prime mover which is configured to drive one or more fluid delivery systems for delivering a fluid in a conduit, and an associated plant, as set out by the preambles in
claims 1 and 6, respectively. The invention is particularly useful in the extraction of shale oil and/or gas by means of pressure pumping equipment for well stimulation, commonly known as "hydraulic fracturing" or "fracking", but is not limited to such operations. - The majority of the equipment used for pressure pumping has been following the same principle for several decades: Trailer or truck mounted power pack (diesel-powered reciprocating engine, or a gas turbine engine), driving a pressure pump through a multi-speed transmission gear box. All parts are mechanically connected.
- A typical pressure pump comprises two major parts: a "fluid end" and a "power end". The fluid end is the actual pressure pump, pressurizing the fracturing fluid. It is normally a plunger/piston pump, typically operating at 150-300 strokes per minute, and is an exchangeable unit. The power end is part of the drivetrain, and it is connected to a multi-speed transmission. The power end has a reduction gear box on the inlet, and is connected to the plunger on the fluid end via a crankshaft and a crosshead. The power is normally provided by a reciprocating engine, although gas turbine engines are also used.
- Some of the problems associated with the prior art are shortened expected lifecycles of the equipment, as well as high maintenance costs during the lifecycle of the drivetrain. In addition, the prior art plants have a large surface footprint.
- The prior art includes
CN 104806220 A , which describes "fully-hydraulic driven" fracturing equipment with a power unit and a fracturing pump. The power unit comprises an engine unit, a transfer case unit and a hydraulic pump unit. Three hydraulic pumps are installed on each transfer case, and the hydraulic pump unit is connected through hydraulic pipelines. The fracturing pump comprises a left and a right pump head; three two-way hydraulic oil cylinders which are arranged in parallel are installed on the fracturing pump. The fracturing pump is driven by the two-way hydraulic oil cylinders, so that the equipment power is increased, the equipment discharge flow is increased; the equipment weight and size are reduced. - The prior art also includes
CN 104727797 A andCN 204552723 U , which describe a system where an engine, a transfer case, a plurality of variable displacement plunger pumps and a double-acting fracturing pump are arranged on a chassis. The output end of the engine is connected with the input end of the transfer case, and the output end of the transfer case comprises a plurality of power take-off ports. Each power take-off port is connected with one variable displacement plunger pump. The plunger pumps drive the double-acting fracturing pump through a hydraulic system. - The prior art also includes
CN 104728208 A , which describes a high-power hydraulic driving fracturing-pump pump station system, in which the hydraulic cylinders are connected with the fracturing cylinders. Electric motor driven hydraulic pump provides high-pressure oil and fluid outlet manifold outputs a high-pressure fracturing fluid. - The prior art also includes
CN 104453825 A , which describes a modularized fracturing pump set which comprises a power unit and a fracturing pump unit. An auxiliary engine is arranged on the power unit and is connected to a hydraulic pump. A torque converter is arranged in the fracturing pump, and the input end of the torque converter is connected to the main engine. The output end of the torque converter is connected to a gearbox, and the output end of the gearbox is connected to the fracturing pump. - The prior art also includes
WO 2014/078236 A1 , which describes a turbo-shaft engine having a drive shaft and a high pressure, and a high-RPM centrifugal pump coupled to the drive shaft. - The prior art also includes
US 4470771 A , which discloses quadraplex pumping unit for use as a mud pump, an intensifier, or as a pump for abrasive fluids or the like. The pumping unit includes four rams and four ram operating pistons. A control valve arrangement provides for pressure equalization and energy transfer from a cylinder which has just extended in a working stroke to a companion cylinder which has just returned to its retracted to rest position, to conserve energy and reduce the thermal burden on the hydraulic system. The valve arrangement further provides for prepressurization, after pressure equalization, prior to an extending stroke. - The prior art also includes
US 2005/006089 A1 , which discloses a method and apparatus for fracturing a subterranean formation. A centrifugal pump is used to combine a fracture fluid, a sand suspension and liquid additive and discharge a mixture of these components into a high pressure pump that injects the mixture into the subterranean formation. The apparatus employs a control pinch valve to precisely control the amount of sand suspension being added to the mixture. - The prior art also includes
US 3722595 A , which discloses a fracturing method wherein an emulsified fluid is injected into a subterranean formation under sufficient pressure to open a fracture in the formation. The fracturing method is performed by continuously passing the liquid used as the external phase through a conduit to establish a turbulent flow stream, introducing the liquid used as the internal phase into the flow stream at a plurality of locations to progressively increase the concentration of the internal phase, and continuously injecting the emulsion into the formation under sufficient pressure to open a fracture therein. The method can be employed in water external or oil external systems. - The prior art also includes
US 2014/010671 A1 , which discloses a hydraulic pump powering system which includes a mobile vehicle, a first electric current generator device, and one or more electric pump motors. The mobile vehicle has first and second prime movers. The first electric current generator device is disposed onboard the mobile vehicle and is configured to be mechanically coupled with the first prime mover to convert movement created by the first prime mover into first electric current. The one or more electric pump motors are configured to receive the first electric current to power a hydraulic pump. The second prime mover is configured to generate movement that is converted into a propulsive force that propels the mobile vehicle. The one or more electric pump motors are configured to receive the first electric current in order to power the hydraulic pump to pump a fluid into a pumping location located off-board the mobile vehicle. - The invention is set forth and characterized in the main claims, while the dependent claims describe other characteristics of the invention.
- It is thus provided a plant for controlling the delivery of a pressurized fluid in a conduit, comprising a prime mover which is configured to supply torque to one or more hydraulic pumps, characterized by each hydraulic pump configured to supply hydraulic pressure to respective positive displacement fluid delivery systems, each positive displacement fluid delivery system configured to deliver said fluid in the conduit, - first sensing means configured for sensing pressure variations in the conduit and connected to a first controller; the first controller being configured to provide control signals to the control valves for at least one fluid delivery system and to a control system for the prime mover, based on said sensed pressure variations.
- The plant may comprise one or more hydraulic pumps configured to communicate with control means and to operate said fluid delivery systems and being driven by the prime mover, whereby the interaction between the hydraulic pumps and the prime mover is controlled based on sensed pressure variations in the conduit.
- In one embodiment, the plant further comprises valve outlet feedback pressure sensors connected to respective control valves, and a valve inlet pressure sensor connected to the control valve. The plant may further comprise a valve controller configured for receiving signals from the pressure sensors and the first sensing means, position feedback from the positive displacement fluid delivery systems, and configured for providing control signals to the control valves.
- In one embodiment, the prime mover may be a gas turbine engine. A gear unit may be arranged between the gas turbine engine and the hydraulic pump. In one embodiment, the prime mover is a reciprocating engine. The at least one positive displacement fluid delivery system may comprise a positive displacement pump.
- It is also provided a method of controlling a prime mover which is configured to drive one or more positive displacement fluid delivery systems for delivering a fluid in a conduit by means of the invented plant, characterized by sensing the pressure variations in the fluid in the conduit; and - based on the sensed pressure variations, controlling at least one of said positive displacement fluid delivery system and controlling the power output of the prime mover.
- The method may further comprise determining an estimated power consumption. In one embodiment, the method comprises controlling the prime mover fuel supply by variations in the sensed pressure. The at least one positive displacement fluid delivery system may be controlled based on a set-point (rate/pressure) identified and set by an operator or an overall control system.
- In one embodiment, a first controller may provide control signals to hydraulic pumps, configured to operate said fluid delivery systems and being driven by the prime mover, whereby the interaction between the hydraulic pumps and the prime mover is controlled based on sensed pressure variations in the conduit.
- The invented plant may be placed on a mobile unit, for example a trailer.
- Although the invention is particularly useful in hydraulic fracturing ("fracking") operations, it is also applicable for all positive displacement pumping processes in which control is based on a flow and pressure-setting an feedback pressures. The invention shall therefore not be limited to fracking operations.
- These and other characteristics of the invention will become clear from the following description of an embodiment, given as a non-restrictive example, with reference to the attached schematic drawings, wherein:
-
Figure 1 is a flowchart showing a typical configuration of the invented plant and illustrating principles of the invention; -
Figure 2 is a perspective view of an embodiment of a mobile unit for the invented plant, in a transportation configuration; -
Figure 3 is a perspective view of the mobile unit illustrated infigure 2 , and illustrates the plant in a pumping (operational) configuration; and -
Figure 4 is a perspective view of the mobile unit illustrated infigure 3 , but where the housing has been removed in order to illustrate the plant. - The following description may use terms such as "horizontal", "vertical", "lateral", "back and forth", "up and down", "upper", "lower", "inner", "outer", "forward", "rear", etc. These terms generally refer to the views and orientations as shown in the drawings and that are associated with a normal use of the invention. The terms are used for the reader's convenience only and shall not be limiting.
- Referring initially to
figures 2, 3 , and4 , the invented plant is in this illustrated embodiment arranged as amobile unit 18 on atrailer 19 and enclosed by ahousing 20. Doors in the housing provide access to the plant, and rear doors allow the movable unit comprising thefluid end 21 with its double-actingcylinders 22 to be moved out and down (seefigure 3 ) when the plant is in operation.Pipes 21a are configured for connection to well piping (not shown). - Referring to
figure 4 , the mobile plant comprises in the illustrated embodiment agas turbine 26, connected via aduct 27a to anair inlet 27, and anexhaust opening 26a. The gas turbine receives fuel from thefuel tank 32. Supply lines and hoses, power lines and control lines, etc., are not shown, as these components are commonly known in the art. - The
gas turbine 26 is connected to a set of single or tandem-mountedhydraulic pumps 30 via agearbox 28.Reference numbers air filtration container 23 is arranged towards the read of the mobile unit, behind oilcooler gearbox 25 andhydraulics 24. - The hydraulic pumps 30 operate double-acting
cylinders 22 in the plant's fluid ends 21. Each hydraulic cylinder operates one plunger, in each of the plant's two fluid ends. - A typical configuration of the invented plant, illustrating the principle of the invention, will now be described with reference to the flowchart in
figure 1 . - In
figure 1 three systems are shown; denoted A, B, C, respectively. It should be understood that only system C is illustrated in detail infigure 1 , for clarity of illustration. The skilled person will understand that the components and functions illustrated and described with reference to system C, also can be applied to systems A and B. It should also be understood that the invention shall not be limited to the number of systems shown infigure 1 . - Reference number 1 denotes a power source, which comprises a
prime mover 2. The prime mover may be a gas turbine engine or a reciprocating engine, controlled via a throttle 3 (controlling fuel supply F and receiving information regarding rotation speed R). Theprime mover 2 is connected, and configured to transfer torque T, to agear unit 8. Thegear unit 8 transfers torque T' to individual hydraulic pumps 9a-c; each pump having respectivepump pressure sensors 13a-c. - If the
prime mover 2 is a gas turbine, thegear unit 8 may be configured to reduce high-rpm output from the turbine. If the prime mover is of another type of engine (e.g. a reciprocating engine), the hydraulic pumps may be driven directly by the engine, and thegear unit 8 may be omitted. - Each hydraulic pump 9a-c supplies hydraulic pressure to respective positive displacement fluid delivery systems, in the illustrated embodiment double-acting
hydraulic cylinders 34a-c, viarespective control valves 36a-c, 37a-c. Areservoir tank 11 and a cooler 17 are fluidly connected between thehydraulic pump 9c and thecontrol valves accumulator 33, for mitigating pressure pulses. - Each
hydraulic cylinder 34a-c is drivingly connected to respective sets of fluid plungers 35al-cl, 35a2-c2. The fluid plungers 35al-cl, 35a2-c2 supply fluid to the well via thefluid supply line 10. The invention shall, however, not be limited to such fluid plungers.Reference number 12 denotes a suction line from a fluid blending system (not shown). - Well
feedback pressure sensor 16 is connected to, and configured to sense the pressure in (and hence pressure variations), thesupply line 10. Valve outletfeedback pressure sensors 15 are connected torespective control valves inlet pressure sensor 14 is connected to controlvalve 36c. A valve controller 7 (typically a programmable logic controller - PLC) receives signals from thepressure sensors control valves - A
main control system 4 controls thethrottle 3 based on power request Pr and provides power feedback Pf. Themain control system 4 also receives transport security interlock feedback Ts from thegear unit 8, and estimated power consumption data EPC from thePLC 7, based on the sensed pressure variations by wellfeedback pressure sensor 16. Alouver controller 5 is also in communication with themain control system 4, to open and close louvers (for e.g. ventilation and fire control). Themain control system 4 receives data from a hydraulic pump controller 6 (e.g. a PLC) and provides a power command Ac to thehydraulic pump controller 6. Thehydraulic pump controller 6 in turn provides the required displacement command Dc to thehydraulic pump 9c based on pump pressure feedback Pp (from thepressure sensor 13c). Themain control system 4 also provides data regarding requested cylinder speed RCS to thevalve controller 7, which in turn determines and provides the valve flow control signal Vf to thecontrol valves - The invention thus comprises a hydraulic-pressure/flow-controlled power transmission, in which all power from the prime mover is transformed into hydraulic power by the hydraulic pumps. The hydraulic pumps enable the prime mover to start against little or no load.
- When the plant is in use in a fracking operation, the
prime mover 2 and the hydraulic pumps 9a-c operate thehydraulic cylinders 34a-c and fluid plungers 35al-cl, 35a2-c2 to supply pressurized fracturing fluid to the line 10 (and thus the subterranean well). The hydraulic fracturing pressure generated in the well is a result of the well pressure and the hydraulic pressure generated by the plungers. The well pressure (which is sensed by the sensor 16) is communicated to thevalve controller PLC 7, which controls thecontrol valves 36a-c, 37a-c and also determines the estimated power consumption EPC, which is transmitted to themain control system 4. The prime mover fuel supply (e.g. turbine fuel injection) may thus be governed by the well pressure, or rather the variations in pressure, as sensed continuously by thesensor 16. The blazing turbine fuel control receives pressure reading from the hydraulic control system, based on the pressure and rate reading from the hydraulic fracturing pressure. The hydraulic control system then performs a control action based on a set-point (rate/pressure) identified and set by the operator. - The "delay" which is inherent in the hydraulic components, or as controlled by the
main control system 4, provides sufficient time for the turbine fuel control to "predict" what is going to happen, and take action before it happens. - This means that the prime mover can - before the requirement arises - either increase the fuel injection (open throttle) to be ready for the higher demand from the hydraulic pumps, or lower the fuel injection (restrict throttle) to adapt to the estimated future requirement of torque, and thereby accommodate the change in rate/pressure. This function is particularly useful in embodiments where the prime mover is a gas turbine engine, as such turbines normally operate at high rotational speeds, and have low torque. The control system may in this fashion prevent the gas turbine engine from over-speeding, and further give the gas turbine engine a head-start on a predicted increased torque demand.
- When the requirement for fracturing fluid in the well changes, or actual consumption of fracturing fluid is changing and not complying with the set point as set by the operator or as determined by an overall control system, the
valve controller 7 andpressure sensor 16 are sensing this, based on sensed pressure variations. The set point may also be defined based on a prioritized list, defined by an overall control system, of how deviating conditions are to be handled. Based on rate/pressure difference between the set point and the actual pressure reading (as sensed by 16), there will occur a situation that the actual power command Ac (fed tomain controller 4 by the pump controller 6) differs from (less or more) the estimated power consumption EPC (fed to themain controller 4 by the valve controller 7). This will lead to a situation that themain controller 4 will be able to give control signal, and being able to control the instant in which the control signal is given, to both thepump controller 6 and to the primemover throttle control 3, simultaneously, or a controlled difference to achieve the prime mover to act in a predictive manner. - Although the invention has been described with reference to three hydraulic pumps, it should be understood that the invention is equally applicable to fewer or more hydraulic pumps.
- Although the invention has been described with reference to a mobile unit, it should be understood that the invention is equally applicable as a stationary plant.
- Although the invention has been described with reference to driving fluid ends (double-acting hydraulic cylinders), it should be understood that the invention is equally applicable to other pumping principles driven by hydraulic flow and pressure, i.e. positive displacement pumps. The invention shall thus not be limited to the double-acting hydraulic cylinders.
Claims (15)
- A plant for controlling the delivery of a pressurized fluid in a conduit (10), comprising a prime mover (2; 26) which is configured to supply torque (T, T') to one or more hydraulic pumps (9a-c; 30),
characterized by:- each hydraulic pump configured to supply hydraulic pressure to respective positive displacement fluid delivery systems (34a-c, 35al-cl, 35a2-c2; 22) via respective control valves (36a-c; 37a-c);- each positive displacement fluid delivery system (34a-c, 35al-cl, 35a2-c2) configured to deliver said fluid in the conduit (10);- first sensing means (16) configured for sensing pressure variations in the conduit (10) and connected to a first controller (7);- the first controller (7) being configured to provide control signals to the control valves (36a-c, 37a-c) for at least one fluid delivery system and to a control system (4, 3) for the prime mover (2), based on said sensed pressure variations. - The plant of claim 1, further comprising one or more hydraulic pumps (9a-c) configured to communicate with control means (6; 7) and to operate said fluid delivery systems (34a-c, 35a1-c1, 35a2-c2) and being driven by the prime mover, whereby the interaction between the hydraulic pumps and the prime mover is controlled based on sensed pressure variations in the conduit (10).
- The plant of any one of claims 1-2, further comprising valve outlet feedback pressure sensors (15) connected to respective control valves (36c, 37c), and a valve inlet pressure sensor (14) connected to the control valve (36c).
- The plant of claim 3, further comprising a valve controller (7) configured for receiving signals from the pressure sensors (14, 15) and the first sensing means (16), position feedback (Cp) from the positive displacement fluid delivery systems, and configured for providing control signals (Vf) to the control valves (36c, 37c).
- The plant of any one of claims 1-4, wherein the prime mover is a gas turbine engine.
- The plant of claim 5, further comprising a gear unit (8; 28) arranged between the gas turbine engine and the hydraulic pump.
- The plant of any one of claims 1-4, wherein the prime mover is a reciprocating engine.
- The plant of any one of claims 1-7, wherein at least one positive displacement fluid delivery system comprises a positive displacement pump.
- A method of controlling a prime mover (2) which is configured to drive one or more positive displacement fluid delivery systems (34a-c, 35al-cl, 35a2-c2) for delivering a fluid in a conduit (10) by means of the plant of any one of the claims 1-8, characterized by- sensing (16) the pressure variations in the fluid in the conduit (10); and- based on the sensed pressure variations,-- controlling (36a-c, 37a-c) at least one of said positive displacement fluid delivery system and-- controlling (4) the power output of the prime mover (2).
- The method of claim 9, further comprising determining an estimated power consumption (EPC).
- The method of claim 9 or claim 10, further comprising controlling the prime mover (2) fuel supply by variations in the sensed pressure.
- The method of any one of claims 9-11, wherein the at least one positive displacement fluid delivery system is controlled based on a set-point (rate/pressure) identified and set by an operator or an overall control system.
- The method of any one of claims 9-12, wherein a first controller (7) provides control signals to hydraulic pumps (9a-c), configured to operate said fluid delivery systems (34a-c, 35al-cl, 35a2-c2) and being driven by the prime mover, whereby the interaction between the hydraulic pumps and the prime mover is controlled based on sensed pressure variations in the conduit (10).
- A mobile unit (18), characterized in that it comprises the plant as defined by any of claims 1-8.
- The mobile unit of claim 14, wherein the plant is arranged on a trailer (19).
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NO20161911A NO343276B1 (en) | 2016-11-30 | 2016-11-30 | A method of controlling a prime mover and a plant for controlling the delivery of a pressurized fluid in a conduit |
PCT/NO2017/050307 WO2018101837A1 (en) | 2016-11-30 | 2017-11-28 | A plant for controlling delivery of pressurized fluid in a conduit, and a method of controlling a prime mover |
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EP3548744A1 EP3548744A1 (en) | 2019-10-09 |
EP3548744B1 true EP3548744B1 (en) | 2020-08-26 |
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EP17840454.7A Active EP3548744B1 (en) | 2016-11-30 | 2017-11-28 | A plant for controlling delivery of pressurized fluid in a conduit, and a method of controlling a prime mover |
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US (1) | US20180266412A1 (en) |
EP (1) | EP3548744B1 (en) |
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-
2016
- 2016-11-30 NO NO20161911A patent/NO343276B1/en unknown
-
2017
- 2017-11-28 MX MX2019006134A patent/MX2019006134A/en unknown
- 2017-11-28 WO PCT/NO2017/050307 patent/WO2018101837A1/en unknown
- 2017-11-28 CA CA3048587A patent/CA3048587A1/en not_active Abandoned
- 2017-11-28 EP EP17840454.7A patent/EP3548744B1/en active Active
- 2017-11-28 CN CN201780073922.7A patent/CN110088470A/en active Pending
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WO2018101837A1 (en) | 2018-06-07 |
CN110088470A (en) | 2019-08-02 |
NO343276B1 (en) | 2019-01-14 |
NO20161911A1 (en) | 2018-05-31 |
US20180266412A1 (en) | 2018-09-20 |
EP3548744A1 (en) | 2019-10-09 |
CA3048587A1 (en) | 2018-06-07 |
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