CN113790142A - Plunger pump system, pressure pulsation compensation method thereof and fracturing equipment - Google Patents
Plunger pump system, pressure pulsation compensation method thereof and fracturing equipment Download PDFInfo
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- CN113790142A CN113790142A CN202111258032.8A CN202111258032A CN113790142A CN 113790142 A CN113790142 A CN 113790142A CN 202111258032 A CN202111258032 A CN 202111258032A CN 113790142 A CN113790142 A CN 113790142A
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- 238000010586 diagram Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 3
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- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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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
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
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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
- E21B43/25—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
- 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
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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
- 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
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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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
- 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
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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
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Computer Hardware Design (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Reciprocating Pumps (AREA)
Abstract
A plunger pump system, a pressure pulsation compensation method thereof and fracturing equipment. The plunger pump system includes a first plunger pump and a fluid pressure compensating structure. The fluid pressure compensation structure is configured to compensate for pressure pulsations of the fluid output by the output of the first plunger pump. The fluid pressure compensation structure comprises at least one linear motor and a second plunger pump driven by the at least one linear motor, and the output end of the second plunger pump is communicated with the output end of the first plunger pump. The plunger pump system provided by the embodiment of the disclosure is additionally provided with the fluid pressure compensation structure with the linear motor and the second plunger pump, the linear motor is small in size, is convenient to integrate with the second plunger pump to realize compact design, and is convenient to adjust and control to realize compensation of pressure pulsation of fluid output by the first plunger pump.
Description
Technical Field
At least one embodiment of the disclosure relates to a plunger pump system, a pressure pulsation compensation method of the plunger pump system and fracturing equipment.
Background
At present, in a multi-cylinder plunger pump, the periodic movement of a crankshaft driving plungers generates flow rate pulsation that causes pressure pulsation of high-pressure pulsating fluid discharged from the multi-cylinder plunger pump. The pressure pulsation represents continuous vibration, reducing the service life of pipelines and components, and further damaging equipment and systems connected with the liquid outlet end of the multi-cylinder plunger pump. In addition, the pressure pulsation of the high pressure pulsating fluid is accompanied by loud noise, and the loud noise easily causes environmental pollution.
Disclosure of Invention
At least one embodiment of the present disclosure provides a plunger pump system, a pressure pulsation compensation method thereof, and a fracturing device.
At least one embodiment of the present disclosure provides a plunger pump system including a first plunger pump and a fluid pressure compensation structure. A fluid pressure compensation structure is configured to compensate for pressure pulsations of the fluid output by the output of the first plunger pump. The fluid pressure compensation structure comprises at least one linear motor and a second plunger pump driven by the at least one linear motor, and an output end of the second plunger pump is communicated with the output end of the first plunger pump.
For example, according to an embodiment of the present disclosure, the number of the second plunger pumps driven by each linear motor is two, two ends of a mover of the linear motor are respectively connected to and drive the two second plunger pumps, the linear motor and the two second plunger pumps are arranged in a linear direction, and the linear motor is configured to reciprocate between the two second plunger pumps.
For example, according to an embodiment of the present disclosure, the at least one linear motor includes a plurality of linear motors, and the number of the second plunger pumps driven by at least one of the plurality of linear motors is one.
For example, according to an embodiment of the present disclosure, the first plunger pump includes a multi-cylinder plunger pump.
For example, in accordance with an embodiment of the present disclosure, the second plunger pump comprises a single cylinder plunger pump.
For example, according to an embodiment of the present disclosure, the plunger pump system further comprises a controller electrically connected to the linear motor. The controller is configured to adjust the speed of the linear motor according to the rotation speed of the first plunger pump so that the period of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to and opposite to the period of the pressure pulsation of the fluid output by the output end of the first plunger pump; and/or the controller is configured to adjust the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump, so that the pressure amplitude of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the pressure amplitude of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the pressure amplitudes are opposite in phase.
For example, according to an embodiment of the present disclosure, the plunger pump system further comprises a rotational speed acquisition portion and/or a pressure acquisition portion. The rotating speed acquisition part is connected with the first plunger pump and is configured to acquire the rotating speed of the first plunger pump. The pressure acquisition part is connected with the first plunger pump and is configured to acquire a pressure pulsation signal of the fluid output by the first plunger pump.
For example, according to an embodiment of the present disclosure, the controller is electrically connected to the rotation speed acquisition portion, the controller includes a linear conversion portion and a speed adjustment portion, and the linear conversion portion is configured to perform linear conversion calculation according to the rotation speed of the first plunger pump to obtain a pulsation period of the fluid output by the fluid pressure compensation structure; the speed adjusting part is configured to calculate a preset speed of the linear motor according to a pulsation cycle of the fluid, and the controller adjusts the speed of the linear motor according to the preset rotational speed.
For example, according to an embodiment of the present disclosure, the pressure collecting part is electrically connected to the controller, and the controller is configured to control the thrust of the linear motor according to the pressure pulsation signal collected by the pressure collecting part.
For example, according to an embodiment of the present disclosure, the input of the second plunger pump communicates with the input of the first plunger pump.
At least one embodiment of the present disclosure provides a fracturing apparatus comprising any of the plunger pump systems described above.
At least one embodiment of the present disclosure provides a pressure pulsation compensation method applied to the plunger pump system, including: adjusting the speed of the linear motor according to the rotating speed of the first plunger pump, so that the period of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the period of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the phases of the two are opposite; and/or the thrust of the linear motor is adjusted according to the pressure of the fluid output by the first plunger pump, so that the pressure amplitude of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the pressure amplitude of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the pressure amplitudes are opposite in phase.
For example, according to an embodiment of the present disclosure, adjusting the speed of the linear motor according to the rotational speed of the first plunger pump includes: collecting the rotating speed of the first plunger pump; performing linear conversion calculation according to the rotating speed of the first plunger pump to obtain the pulsation period of the fluid output by the fluid pressure compensation structure; and calculating the preset speed of the linear motor according to the pulsation period of the fluid, and adjusting the speed of the linear motor according to the preset rotating speed.
For example, according to an embodiment of the present disclosure, adjusting the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump includes: collecting a pressure pulsation signal of the fluid output by the first plunger pump; and controlling the thrust of the linear motor according to the pressure pulsation signal.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.
FIG. 1 is a block diagram of a plunger pump system provided in accordance with an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a fluid pressure compensation arrangement provided in accordance with an example of an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of the controller shown in FIG. 1 electrically connected to a rotational speed acquisition unit;
FIG. 4 is a schematic diagram of at least a portion of the process of the controller shown in FIG. 1 adjusting the speed of the linear motor based on the rotational speed of the first plunger pump;
FIG. 5 is a schematic diagram of the controller shown in FIG. 1 electrically connected to a pressure acquisition portion; and
fig. 6 is a block diagram of a fracturing apparatus provided in accordance with an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. In the present disclosure, the names of the "first plunger pump" and the "second plunger pump" may be interchanged, one of which is driven by a linear motor and the other of which is driven by an electric motor or a turbine engine as a power source.
The means for canceling flow pulsations include passive compensation and active compensation. The passive compensation means that an energy storage buffer is additionally arranged on a pulsating pipeline, and a pressure is set for the energy storage buffer according to the pressure condition of a system generating flow pulsation so as to reduce the amplitude of the pressure pulsation of the system. Active compensation means that an external power source is added to introduce secondary pulsation with amplitude and period equal to that of pulsation pressure and opposite phase into a system to eliminate initial pulsation in the system.
Active ripple compensation includes three forms: inflow compensation, shunt compensation and split inflow compensation. The active pulsation compensation enables the system to finally output stable flow in an active flow control mode. The inflow active compensation means that extra energy is added into the system, for example, a flow compensation pump is added into the system, the supply amount of the pump is controlled by a servo valve, and the flow compensation pump is supplemented aiming at the wave trough of flow pulsation in a pipeline of the system, so that the flow in the pipeline tends to be smooth, and the pressure pulsation in the system is reduced. The split-flow type active compensation means that a part of peak flow is split by adjusting the opening of a valve in a pipeline, so that the purposes of stable flow output and stable pressure are achieved. The split-inflow type active compensation couples the split type and the inflow type, namely, the split is carried out when the fluid output by the pipeline is at the peak value of the flow, and the stabilization of the flow and the pressure of the system is kept by a supplementing mode when the fluid is at the valley value of the flow, so that the effect of reducing the pressure pulsation is achieved.
In the actual use process, the volume of the energy storage buffer additionally arranged on the discharge pipeline is too large by adopting a passive pulsation compensation mode, and the compensation effect of the mode on low-frequency pulsation is poor. In high-pressure large-displacement operation, the pipeline has strong vibration. The active pulsation compensation is applied to a system with about 20MPa in a small amount due to a complex process, but is not applied to operation with more than 50MPa, so that the service life of pipelines and equipment is short, and the replacement is frequent.
In the research, the inventor of the application finds that the working pressure of the multi-cylinder plunger pump is very high, if a shunting type active compensation mode is adopted, the danger of the discharge process is high, the spraying device is easy to wear, and the service life of the equipment is shortened.
The embodiment of the disclosure provides a plunger pump system, a pressure pulsation compensation method of the plunger pump system and fracturing equipment. The plunger pump system includes a first plunger pump and a fluid pressure compensating structure. The fluid pressure compensation structure is configured to compensate for pressure pulsations of the fluid output by the output of the first plunger pump. The fluid pressure compensation structure comprises at least one linear motor and a second plunger pump driven by the at least one linear motor, and the output end of the second plunger pump is communicated with the output end of the first plunger pump. The plunger pump system provided by the embodiment of the disclosure is additionally provided with the fluid pressure compensation structure with the linear motor and the second plunger pump, the linear motor is small in size, is convenient to integrate with the second plunger pump to realize compact design, and is convenient to adjust and control to realize compensation of pressure pulsation of fluid output by the first plunger pump.
The plunger pump system, the pressure pulsation compensation method thereof and the fracturing equipment provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a plunger pump system provided in accordance with an embodiment of the present disclosure. As shown in fig. 1, the plunger pump system includes a first plunger pump 100 and a fluid pressure compensating structure 200. The fluid pressure compensation structure 200 is configured to compensate for pressure pulsations of the fluid output by the output 101 of the first plunger pump 100. The fluid pressure compensation structure 200 includes at least one linear motor 210 and a second plunger pump 220 driven by the at least one linear motor 210, and an output 221 of the second plunger pump 220 is communicated with the output 101 of the first plunger pump 100, so that the fluid output from the output 221 of the second plunger pump 220 compensates for pressure pulsation of the fluid output from the output 101 of the first plunger pump 100. The plunger pump system provided by the embodiment of the disclosure is additionally provided with the fluid pressure compensation structure with the linear motor and the second plunger pump, the linear motor is small in size, is convenient to integrate with the second plunger pump to realize compact design, and is convenient to adjust and control to realize compensation of pressure pulsation of fluid output by the first plunger pump.
The fluid pressure compensation system comprising the linear motor and the second plunger pump adopts an inflow type active compensation mode, and the second plunger pump column driven by the linear motor can compensate the pressure artery of the fluid output by the first plunger pump. The plunger pump system provided by the embodiment of the disclosure can avoid noise caused by the discharge of high-pressure fluid and abrasion of equipment connected with the output end of the first plunger pump by using an inflow type active compensation mode. In addition, the linear motor is adopted to drive the second plunger pump, so that pressure pulsation compensation can be realized through smaller displacement.
For example, when the first plunger pump 100 is operated, the mechanical energy is directly converted into the pressure energy of the delivered liquid by the plunger pump. For example, the first plunger pump 100 may include a power end assembly 110 including a plunger and a valve housing, and a fluid end assembly 120 including a crankshaft, a connecting rod, a slide rail, and a crosshead from which power is transmitted to the plunger. For example, a pull rod may be disposed between the plunger and the crosshead, the pull rod is fixed to the crosshead, the plunger is fixed to the pull rod, the crosshead reciprocates inside the slide rail, and the crosshead drives the plunger to reciprocate inside the hydraulic end assembly (e.g., inside the valve box) through the pull rod, so that liquid is sucked into the pump rod and discharged from the high-pressure discharge pipeline, and suction of low-pressure fluid and discharge of high-pressure fluid are achieved. Further, in some examples, the plunger may also be mounted directly to the crosshead inside the power end assembly. However, the structure of the first plunger pump described above is merely exemplary, and any suitable structure of the plunger pump may be selected according to the first plunger pump in the embodiment of the present disclosure.
For example, the output 101 of the first plunger pump 100 may refer to a port of the first plunger pump 100 that discharges high-pressure fluid.
For example, the first plunger pump 100 includes a multi-cylinder plunger pump. For example, a multi-cylinder plunger pump may include a multi-cylinder valve box. For example, fig. 1 schematically illustrates the multi-cylinder valve housing including a three-cylinder valve housing, but is not limited thereto, and the multi-cylinder valve housing may also include a two-cylinder valve housing, a four-cylinder valve housing, a five-cylinder valve housing, a six-cylinder valve housing, or a seven-cylinder valve housing.
For example, as shown in fig. 1, the plunger pump system further comprises a power source 300, the power source 300 being configured to drive the first plunger pump 100. For example, the power source 300 may be coupled to the power end of the first plunger pump 100 and configured to power the power end of the first plunger pump 100. For example, the power source may be an electric motor or a turbine engine, which is not limited in the embodiments of the present disclosure.
For example, as shown in fig. 1, the number of the second plunger pumps 220 driven by each linear motor 210 is two. For example, each linear motor 210 may be a double-acting linear motor, i.e., one linear motor 210 drives two second plunger pumps 220, and the linear motor 210 is located between the two second plunger pumps 220. For example, both ends of the mover of the linear motor 210 are respectively connected to and drive the two second plunger pumps 220, the linear motor 210 and the two second plunger pumps 220 are aligned in a linear direction, and the mover of the linear motor 210 is configured to reciprocate linearly between the two second plunger pumps 220. The linear motor can directly drive the second plunger pump by utilizing the characteristic of linear motion of the linear motor.
For example, the second plunger pump 220 includes a fluid end assembly, and the linear motor 210 may be coupled to the fluid end assembly via a coupling assembly. For example, the fluid end assembly may include a plunger and a valve housing. For example, the connection assembly may include a plunger connector, a support rod and a mover connector, one end of the support rod is connected to the plunger connector, the other end of the support rod is connected to the mover connector, the other end of the plunger connector is connected to the plunger, the other end of the mover connector is connected to the mover of the linear motor, and the linear motor may drive the plunger to reciprocate in the valve box through the connection assembly, so that liquid is sucked into the pump cylinder and discharged at high pressure, and suction of low-pressure fluid and discharge of high-pressure fluid are achieved. Of course, the disclosed embodiments are not limited thereto, and the mover of the linear motor may also be directly connected with the plunger of the second plunger pump.
For example, the second plunger pump 220 may comprise a single cylinder plunger pump. For example, the two ends of the mover of the linear motor 210 are respectively connected to and drive two single-cylinder plunger pumps, for example, an example of the embodiment of the present disclosure uses a double-acting linear motor to drive two single-cylinder plunger pumps. The linear motor has the linear motion characteristic, is convenient to integrate with the double-acting single-cylinder plunger pump, has compact design and is easy to realize.
For example, the output 221 of the second plunger pump 220 may refer to a port where the second plunger pump 220 discharges high pressure fluid. For example, the output end 101 of the first plunger pump 100 is communicated with the output end 221 of the second plunger pump 220, which means that the pipeline for discharging the high-pressure fluid of the first plunger pump 100 is communicated with the pipeline for discharging the high-pressure fluid of the second plunger pump 220, so that the high-pressure fluids discharged from the pipelines of the first plunger pump 100 and the second plunger pump 220 can be merged, and therefore the fluid output by the second plunger pump 220 compensates for the pressure pulsation of the fluid output by the first plunger pump 100.
For example, as shown in fig. 1, the input 222 of the second plunger pump 220 is in communication with the input 102 of the first plunger pump 100. For example, the input 102 of the first plunger pump 100 may refer to a port through which the first plunger pump 100 flows into low-pressure fluid, the input 222 of the second plunger pump 220 may refer to a port through which the second plunger pump 220 flows into low-pressure fluid, and the communication between the input 222 of the second plunger pump 220 and the input 102 of the first plunger pump 100 may refer to the communication between a pipeline through which the first plunger pump 100 flows into low-pressure fluid and a pipeline through which the second plunger pump 220 flows into low-pressure fluid, which may facilitate the design of the plunger pump system. The disclosed embodiments are not limited thereto, and the input end of the second plunger pump and the input end of the first plunger pump may not be communicated, and the two are separated from each other, and the low-pressure fluid may be sucked from different pipes.
For example, the linear motor 210 drives the second plunger pump 220, which has advantages such as omitting an intermediate conversion mechanism for converting a rotational motion into a linear motion, simplifying the overall structure, reducing the weight and volume of the fluid pressure compensation structure, saving cost, and facilitating maintenance and repair of the second plunger pump; for example, direct transmission can be realized when linear motion is required, so that various positioning errors caused by intermediate links can be eliminated, and the positioning precision of the linear motor is high; for example, the linear motor has high reaction speed, high sensitivity and good follow-up property; for example, the linear motor has less mechanical friction loss, so that the linear motor has less faults and is free from maintenance, thereby having safe and reliable work and long service life.
For example, the linear motor may include a direct current linear motor, an alternating current linear motor, a linear asynchronous motor, a linear synchronous motor, or a linear stepping motor. For example, the linear motor may be a flat plate type linear motor, and includes a mover, a stator, and a guide rail, the guide rail is fixed, and the stator drives the mover to reciprocate on the guide rail.
For example, the left and right ends of the mover of the double-acting linear motor 210 are directly connected to one plunger, respectively, and each double-acting linear motor alternately drives the two plungers on the left and right sides, and thus drives the second plunger pumps 2201 and 2202 respectively located on both sides of the linear motor 210. The output of the second plunger pumps 2201 and 2202 are both in communication with the output of the first plunger pump 100. For example, the linear motor 210 drives a single-cylinder plunger pump (i.e., two second plunger pumps) on both sides to operate. When the mover of the linear motor 210 moves to one side, the second plunger pump 2202 sucks a low-pressure fluid, and the output end of the second plunger pump 2201 discharges a high-pressure fluid, which may be merged with the high-pressure fluid discharged from the first plunger pump 100 in a high-pressure line; when the mover of the linear motor 210 moves to the other side, the second plunger pump 2201 sucks a low-pressure fluid, and the second plunger pump 2202 discharges a high-pressure fluid, which may be merged with the high-pressure fluid discharged from the first plunger pump 100 in a high-pressure line; by repeating the above steps, the fluid pressure compensation structure can discharge high-pressure fluid alternately by the two second plunger pumps to realize pulsation compensation of the high-pressure fluid discharged by the first plunger pump.
For example, as shown in fig. 1, taking the second plunger pump 2202 as an example, when the mover of the linear motor 210 moves in a direction approaching the second plunger pump 2202, the check valve of the second plunger pump 2202 opens, and high-pressure fluid is pumped into a pipeline communicating with the output end of the first plunger pump 100; when the mover of the linear motor 210 moves in a direction away from the second plunger pump 2202, the check valve of the second plunger pump 2202 is closed, the low-pressure fluid is sucked into the second plunger pump 2202, and the high-pressure fluid in the output end (e.g., an output line) of the second plunger pump 2202 is sealed by the check valve, so that the linear motor operates cyclically.
The plunger pump system provided by the embodiment of the disclosure adopts the linear motor to drive the double-acting second plunger pump to compensate, through the reciprocating motion of the linear motor rotor, the second plunger pump at one end of the linear motor is in liquid suction, and the second plunger pump at the other end of the linear motor is in liquid pressing, so that the two second plunger pumps can work alternately, the use efficiency of the linear motor is improved, and the output flow of the second plunger pump is improved.
For example, fig. 1 schematically shows that the fluid pressure compensation structure includes one linear motor and two second plunger pumps driven by the linear motor, but is not limited thereto, and the fluid pressure compensation structure may include two linear motors and four second plunger pumps, or three linear motors and six second plunger pumps, all of whose output terminals are connected to the output terminal of the first plunger pump. The fluid pressure compensation structure provided by the embodiment of the disclosure can set the number of the linear motors and the number of the second plunger pumps according to actual engineering requirements.
For example, as shown in fig. 1, the linear motor 210 may further include a linear motor driver 400, the linear motor driver 400 being electrically connected to the mover of the linear motor 210 and configured to control the mover of the linear motor 210 to perform a high-speed linear reciprocating motion. The linear motor is convenient to adjust and control, for example, the linear motor can have different speeds and electromagnetic thrust by adjusting the voltage or frequency of the linear motor, and therefore, the linear motor is suitable for various reciprocating operation occasions.
For example, fig. 2 is a schematic diagram of a fluid pressure compensation structure provided in accordance with another example of an embodiment of the present disclosure. For example, as shown in fig. 2, the present example provides a fluid pressure compensation structure that differs from the fluid pressure compensation structure shown in fig. 1 in that: in the fluid pressure compensating structure 200, the at least one linear motor 210 includes a plurality of linear motors 210, and the number of the second plunger pumps 220 driven by the at least one linear motor 210 among the plurality of linear motors 210 is one.
For example, as shown in fig. 2, each linear motor 210 is a single-acting linear motor, and the mover of each linear motor 210 individually drives one second plunger pump 220. The fluid pressure compensation structure 200 includes at least two linear motors 210 and a second plunger pump 220 driven by the at least two linear motors 210, thereby achieving pressure pulsation compensation of the high-pressure fluid discharged from the first plunger pump. For example, the output of the second plunger pump 220 driven by the at least two linear motors 210 are both in communication with the output of the first plunger pump. For example, the input ends of the at least two linear motors 210 driving the second plunger pumps 220 may both be in communication with the input end of the first plunger pump, at least one of the at least two linear motors may be in communication with the input end of the first plunger pump, or neither of the at least two linear motors may be in communication with the input end of the first plunger pump.
For example, the fluid pressure compensating structure 200 may include a combination of 2-7 linear motors 210, and the number of the second plunger pumps 220 is the same as the number of the linear motors 210.
Of course, in the embodiment of the present disclosure, the plurality of linear motors may be all single-acting linear motors, or all double-acting linear motors, or include a part of single-acting linear motors and a part of double-acting linear motors.
For example, as shown in fig. 1, the plunger pump system further includes a controller 500 electrically connected to the linear motor 210. For example, the controller 500 is configured to adjust the speed of the linear motor 210 according to the rotational speed of the first plunger pump 100 so that the period of the pressure pulsation of the fluid output from the output 221 of the second plunger pump 220 is equal to and opposite in phase to the period of the pressure pulsation of the fluid output from the output 101 of the first plunger pump 100. The rotational speed of the first plunger pump 100 includes the rotational speed of the crankshaft.
For example, the controller 500 may calculate a first pulsation period of the pressure pulsation of the fluid output from the first plunger pump 100 according to the rotation speed of the first plunger pump 100, and the controller 500 controls the linear motor driver 400 to adjust the speed of the linear motor 210 according to the first pulsation period, so that the fluid output from the second plunger pump 220 may have a second pulsation period identical to the first pulsation period, and the phases of the two pressure pulsations are opposite. For example, the controller 500 may adjust the period and phase of the pressure pulsation of the fluid output by the second plunger pump 220 by adjusting the speed of the linear motor 210 to adjust the movement of the mover of the linear motor 210, adjusting the movement speed of the plunger in the second plunger pump 220.
According to the embodiment of the disclosure, the rotation speed of the first plunger pump (such as a multi-cylinder plunger pump) is acquired, and the speed of the linear motor is adjusted, so that the output pressure pulsation period of the second plunger pump (such as a single-cylinder plunger pump) driven by the linear motor is matched with the output pressure pulsation period of the first plunger pump (such as a multi-cylinder plunger pump), and further the output pressure pulsation compensation of the first plunger pump is realized.
For example, as shown in fig. 1, the plunger pump system further includes a rotation speed acquisition portion 600, and the rotation speed acquisition portion 600 is connected to the first plunger pump 100 and configured to acquire the rotation speed of the first plunger pump 100. For example, the rotation speed collecting part 600 may include a rotation speed sensor, an encoder, a photosensor, and the like.
For example, fig. 3 is a schematic diagram of the controller shown in fig. 1 electrically connected to the rotation speed acquisition unit. As shown in fig. 1 and 3, the controller 500 is electrically connected to the rotational speed acquisition unit 600, and the rotational speed acquisition unit 600 transmits the acquired data of the rotational speed of the first plunger pump 100 to the controller 500.
For example, fig. 4 is a schematic diagram of at least a portion of the process of the controller shown in fig. 1 for adjusting the speed of the linear motor based on the rotational speed of the first plunger pump. As shown in fig. 1 and 4, the controller 500 includes a linear transformation part 510 and a speed adjustment part 520. For example, the linear conversion unit 510 is configured to perform linear conversion calculation according to the rotation speed of the first plunger pump 100 to obtain the pulsation cycle of the fluid output by the first plunger pump 100, which is equal to the pulsation cycle of the fluid output by the fluid pressure compensation structure 200. The meaning of "equal to" or the like in the embodiment of the present disclosure means that the concept of equal includes approximately equal and completely equal, and approximately equal means that the ratio of the difference between the two to either one of the two is not more than 10%.
Since the rotating speed of the first plunger pump (such as a multi-cylinder plunger pump) in field operation can be changed, in order to adapt to various actual operation conditions, the variable pulsation period of the linear motor can be obtained by collecting the unstable rotating speed of the multi-cylinder plunger pump and performing linear conversion calculation.
For example, the linear transformation unit 510 may be a module implemented by software, or may be a hardware circuit constructed to implement corresponding functions, where the hardware circuit includes a conventional Very Large Scale Integration (VLSI) circuit or a gate array, and an existing semiconductor such as a logic chip, a transistor, or other discrete components.
For example, the linear transformation calculation may include the following equation:
the second plunger pump movement period is (60 × first plunger pump reduction ratio)/(first plunger pump rotation speed × number of first plunger pump cylinders).
For example, as shown in fig. 1, the speed adjusting part 520 is configured to calculate a preset speed of the linear motor 210 according to the pulsation cycle of the fluid, and the controller 500 adjusts the speed of the linear motor 210 according to the preset rotation speed. For example, the controller 500 is configured to control the linear motor driver 400 to adjust the movement speed of the linear motor 210 to the above-mentioned preset speed.
For example, as shown in fig. 1 and 4, the plunger pump system further includes a speed feedback part 01, the speed feedback part 01 may collect the speed of the linear motor and feed back the collected speed data of the linear motor to the controller 500, the controller 500 may compare the preset speed with the actual speed of the linear motor, and if the difference between the preset speed and the actual speed is large, the controller 500 may adjust at least one of the linear conversion part and the speed adjustment part to adjust the actual speed of the linear motor to be substantially equal to the preset speed.
For example, as shown in fig. 1, the plunger pump system further includes a pressure acquisition part 700, and the pressure acquisition part 700 is connected to the first plunger pump 100 and configured to acquire a pressure pulsation signal of the fluid output by the first plunger pump 100. For example, the pressure collection part 700 may include a pressure sensor or a pressure transmitter to measure the fluid pressure.
For example, fig. 5 is a schematic diagram of the controller shown in fig. 1 electrically connected to the pressure acquisition unit. As shown in fig. 1 and 5, the pressure collecting part 700 is electrically connected to the controller 500, and the controller 500 is configured to control the thrust of the linear motor 210 according to the pressure pulsation signal collected by the pressure collecting part 700. For example, the pressure acquisition unit 700 transmits the acquired data of the pressure of the fluid output from the first plunger pump 100 to the controller 500.
For example, the controller 500 is configured to adjust the thrust and speed of the linear motor 210 according to the pressure of the fluid output by the first plunger pump 100 so that the pressure amplitude of the pressure pulsation of the fluid output by the output end of the second plunger pump 220 is equal to and opposite to the pressure amplitude of the pressure pulsation of the fluid output by the output end of the first plunger pump 100.
According to the embodiment of the disclosure, the discharge pressure of a first plunger pump (such as a multi-cylinder plunger pump) is collected and fed back to a controller, and the controller controls a linear motor driver, so that the thrust of a linear motor is adjusted, and the second plunger pump forms pulsation with an effective value and an amplitude equal to and a phase opposite to that of the pressure pulsation of fluid discharged by the first plunger pump.
The pressure of the fluid discharged from the first plunger pump may be determined by a load of a rear end connected to an output end of the first plunger pump.
The disclosed embodiment does not change the pressure of the fluid discharged by the first plunger pump (such as a multi-cylinder plunger pump), and only compensates the pressure pulsation of the fluid discharged by the first plunger pump through the fluid pressure compensation structure. The controller can adjust the thrust of the linear motor according to the pressure change of the fluid discharged by the first plunger pump so as to adapt to the increase and decrease of the pressure of the fluid discharged by the first plunger pump, and further better compensate the pressure of the fluid discharged by the first plunger pump.
For example, the controller may be configured to adjust the speed of the linear motor, and/or adjust the thrust of the linear motor. For example, the controller may adjust the speed of the linear motor and the thrust of the linear motor, mainly to adjust the speed.
For example, the controller in the embodiments of the present disclosure may be implemented in software for execution by various types of processors, or may be implemented as a hardware circuit constructed to implement corresponding functions, the hardware circuit including a conventional Very Large Scale Integration (VLSI) circuit or a gate array, and an existing semiconductor such as a logic chip, a transistor, or other discrete components.
Fig. 6 is a block diagram of a fracturing apparatus provided in accordance with an embodiment of the present disclosure. As shown in fig. 6, the fracturing apparatus includes the plunger pump system provided in the above embodiments. The fluid pressure compensation structure with the linear motor and the second plunger pump is additionally arranged in the fracturing equipment, the linear motor is small in size, the linear motor is convenient to integrate with the second plunger pump to achieve compact design, and the linear motor is convenient to adjust and control to achieve compensation of pressure pulsation of fluid output by the first plunger pump.
Another embodiment of the present disclosure provides a pressure pulsation compensation method applied to any one of the plunger pump systems described above, where the pressure pulsation compensation method includes: the speed of the linear motor is adjusted according to the rotating speed of the first plunger pump, so that the period of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the period of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the phases of the two are opposite; and/or adjusting the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump, so that the pressure amplitude of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the pressure amplitude of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the pressure amplitudes are opposite in phase.
For example, adjusting the speed of the linear motor according to the rotational speed of the first plunger pump includes: collecting the rotating speed of a first plunger pump; performing linear conversion calculation according to the rotating speed of the first plunger pump to obtain the pulsation period of the fluid output by the fluid pressure compensation structure; and calculating a preset speed of the linear motor according to the pulsation period of the fluid, and adjusting the rotating speed of the linear motor according to the preset speed.
For example, as shown in fig. 1, the rotation speed acquisition part 600 is connected with the first plunger pump 100 and configured to acquire the rotation speed of the first plunger pump 100. For example, the controller 500 may calculate a first pulsation period of the pressure pulsation of the fluid output from the first plunger pump 100 according to the rotation speed of the first plunger pump 100, and the controller 500 controls the linear motor driver 400 to adjust the speed of the linear motor 210 according to the first pulsation period, so that the fluid output from the second plunger pump 220 may have a second pulsation period identical to the first pulsation period, and the phases of the two pressure pulsations are opposite.
For example, as shown in fig. 1, the linear conversion unit 510 is configured to perform linear conversion calculation according to the rotation speed of the first plunger pump 100 to obtain the pulsation period of the fluid output by the first plunger pump 100, where the pulsation period is equal to the pulsation period of the fluid output by the fluid pressure compensation structure 200. For example, the speed adjusting part 520 is configured to calculate a preset speed of the linear motor 210 according to the pulsation cycle of the fluid, and the controller 500 adjusts the speed of the linear motor 210 according to the preset speed. For example, the controller 500 is configured to control the linear motor driver 400 to adjust the movement speed of the linear motor 210 to the above-mentioned preset speed.
For example, adjusting the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump includes: collecting a pressure pulsation signal of the fluid output by the first plunger pump; and controlling the thrust of the linear motor according to the pressure pulsation signal.
For example, as shown in fig. 1, the pressure acquisition unit 700 is connected to the first plunger pump 100 and configured to acquire a pressure pulsation signal of the fluid output from the first plunger pump 100. For example, the pressure collecting part 700 is electrically connected to the controller 500, and the controller 500 is configured to control the thrust of the linear motor 210 according to the pressure pulsation signal collected by the pressure collecting part 700. For example, the pressure acquisition unit 700 transmits the acquired data of the pressure of the fluid output from the first plunger pump 100 to the controller 500.
The pressure pulsation compensation method applied to any one of the plunger pump systems provided by the embodiments of the present disclosure may adjust at least one of a phase, a period, and a pressure amplitude of the fluid output by the fluid pressure compensation structure according to at least one of the rotational speed of the first plunger pump and the output fluid thereof, thereby compensating the pressure pulsation of the fluid output by the first plunger pump.
The following points need to be explained:
(1) in the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.
(2) Features of the same embodiment of the disclosure and of different embodiments may be combined with each other without conflict.
The above description is intended to be exemplary of the present disclosure, and not to limit the scope of the present disclosure, which is defined by the claims appended hereto.
Claims (14)
1. A plunger pump system comprising:
a first plunger pump;
a fluid pressure compensation structure configured to compensate for pressure pulsation of the fluid output from the output end of the first plunger pump;
wherein the fluid pressure compensation structure comprises at least one linear motor and a second plunger pump driven by the at least one linear motor, an output end of the second plunger pump being in communication with the output end of the first plunger pump.
2. The plunger pump system according to claim 1, wherein the number of the second plunger pumps driven by each linear motor is two, two second plunger pumps are respectively connected and driven by both ends of a mover of the linear motor, the linear motor and the two second plunger pumps are arranged in a linear direction, and the mover of the linear motor is configured to reciprocate linearly between the two second plunger pumps.
3. The plunger pump system of claim 1 wherein the at least one linear motor comprises a plurality of linear motors, at least one of the plurality of linear motors driving one of the second plunger pumps.
4. The plunger pump system of claim 1, wherein the first plunger pump comprises a multi-cylinder plunger pump.
5. The plunger pump system of claim 1, wherein the second plunger pump comprises a single cylinder plunger pump.
6. The plunger pump system of any of claims 1-5, further comprising:
the controller is electrically connected with the linear motor;
wherein the controller is configured to adjust the speed of the linear motor in accordance with the rotational speed of the first plunger pump such that the period of the pressure pulsation of the fluid output from the output of the second plunger pump is equal to and opposite in phase to the period of the pressure pulsation of the fluid output from the output of the first plunger pump; and/or the presence of a gas in the gas,
the controller is configured to adjust the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump, so that the pressure pulsation of the fluid output by the output end of the second plunger pump is equal in magnitude and opposite in phase to the pressure pulsation of the fluid output by the output end of the first plunger pump.
7. The plunger pump system of claim 6, further comprising:
a rotational speed acquisition part connected with the first plunger pump and configured to acquire a rotational speed of the first plunger pump; and/or the presence of a gas in the gas,
and the pressure acquisition part is connected with the first plunger pump and is configured to acquire a pressure pulsation signal of the fluid output by the first plunger pump.
8. The plunger pump system according to claim 7, wherein the controller is electrically connected to the rotational speed acquisition part, the controller comprises a linear conversion part and a speed adjustment part, and the linear conversion part is configured to perform linear conversion calculation according to the rotational speed of the first plunger pump to obtain the pulsation period of the fluid output by the fluid pressure compensation structure; the speed adjusting part is configured to calculate a preset speed of the linear motor according to a pulsation cycle of the fluid, and the controller adjusts the speed of the linear motor according to the preset speed.
9. The plunger pump system of claim 7, wherein the pressure acquisition portion is electrically connected with the controller, the controller configured to control the thrust of the linear motor according to the pressure pulsation signal acquired by the pressure acquisition portion.
10. The plunger pump system of any of claims 1-5, wherein an input of the second plunger pump is in communication with an input of the first plunger pump.
11. A fracturing apparatus comprising the plunger pump system of any of claims 1-10.
12. A pressure pulsation compensation method applied to the plunger pump system of claim 1, comprising:
adjusting the speed of the linear motor according to the rotating speed of the first plunger pump, so that the period of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the period of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the phases of the two are opposite; and/or the presence of a gas in the gas,
and adjusting the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump, so that the pressure amplitude of the pressure pulsation of the fluid output by the output end of the second plunger pump is equal to the pressure amplitude of the pressure pulsation of the fluid output by the output end of the first plunger pump, and the pressure amplitudes are opposite in phase.
13. The pressure pulsation compensation method according to claim 12, wherein adjusting the speed of the linear motor according to the rotational speed of the first plunger pump comprises:
collecting the rotating speed of the first plunger pump;
performing linear conversion calculation according to the rotating speed of the first plunger pump to obtain the pulsation period of the fluid output by the fluid pressure compensation structure; and
and calculating the preset speed of the linear motor according to the pulsation period of the fluid, and adjusting the speed of the linear motor according to the preset speed.
14. The pressure pulsation compensation method according to claim 12, wherein adjusting the thrust of the linear motor according to the pressure of the fluid output by the first plunger pump includes:
collecting a pressure pulsation signal of the fluid output by the first plunger pump; and
and controlling the thrust of the linear motor according to the pressure pulsation signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111258032.8A CN113790142A (en) | 2021-10-27 | 2021-10-27 | Plunger pump system, pressure pulsation compensation method thereof and fracturing equipment |
| PCT/CN2021/129434 WO2023070742A1 (en) | 2021-10-27 | 2021-11-09 | Plunger pump system, pressure pulsation compensation method therefor, and fracturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111258032.8A CN113790142A (en) | 2021-10-27 | 2021-10-27 | Plunger pump system, pressure pulsation compensation method thereof and fracturing equipment |
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| CN113790142A true CN113790142A (en) | 2021-12-14 |
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| WO (1) | WO2023070742A1 (en) |
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| JP2552584B2 (en) * | 1991-05-02 | 1996-11-13 | サヌキ工業株式会社 | Two-liquid mixed liquid feeding method in liquid detection device |
| CN101832245B (en) * | 2010-04-28 | 2013-09-18 | 北京航空航天大学 | Double-plunger pulse-free flow combining method and direct-drive plunger pump |
| CN103397992B (en) * | 2013-08-06 | 2016-05-11 | 吉林大学 | The intertwining phase place bidirectional ram pump of monocline |
| US10876525B2 (en) * | 2015-11-26 | 2020-12-29 | Shimadzu Corporation | Liquid feed device, liquid feed control method for liquid feed device, and liquid feed control program for liquid feed device |
| CN106812737A (en) * | 2015-11-30 | 2017-06-09 | 长沙理工大学 | A kind of plunger pump pressure fluctuation restraining device based on wrong PGC demodulation |
| CN106224323B (en) * | 2016-09-13 | 2017-12-01 | 华侨大学 | A kind of closed type hydraulic system of more single plunger pump restructuring control asymmetrical cylinders |
| US10961823B2 (en) * | 2016-11-04 | 2021-03-30 | Schlumberger Technology Corporation | Pressure exchanger pressure oscillation source |
| CN107228103A (en) * | 2017-06-29 | 2017-10-03 | 同济大学 | It is a kind of to reduce the control device of Pressure in Axial Piston Pump pulsation |
| CN110043236B (en) * | 2019-05-13 | 2020-06-23 | 燕山大学 | Pulsating hydraulic fracturing pressure generation device and method |
| CN211900900U (en) * | 2019-08-27 | 2020-11-10 | 烟台杰瑞石油装备技术有限公司 | Plunger pump driven by linear motor |
| CN112983798B (en) * | 2021-03-25 | 2023-02-24 | 烟台杰瑞石油装备技术有限公司 | Control method and control device applied to electrically-driven fracturing equipment |
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