CN111120242A - Hydraulic control linkage pressurization injection device - Google Patents
Hydraulic control linkage pressurization injection device Download PDFInfo
- Publication number
- CN111120242A CN111120242A CN202010092974.2A CN202010092974A CN111120242A CN 111120242 A CN111120242 A CN 111120242A CN 202010092974 A CN202010092974 A CN 202010092974A CN 111120242 A CN111120242 A CN 111120242A
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- Prior art keywords
- valve
- liquid
- reversing valve
- way reversing
- hydraulic
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- 238000002347 injection Methods 0.000 title claims abstract description 39
- 239000007924 injection Substances 0.000 title claims abstract description 39
- 239000002002 slurry Substances 0.000 claims abstract description 72
- 239000007788 liquid Substances 0.000 claims description 86
- 238000001914 filtration Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000017105 transposition Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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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
- 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
- F04B9/111—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 with two mechanically connected pumping members
- F04B9/113—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 with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting liquid motor
-
- 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
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- 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
- F04B49/225—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 with throttling valves or valves varying the pump inlet opening or the outlet opening
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic control linkage pressurization injection device, wherein an original slurry inlet and outlet valve of the hydraulic control linkage pressurization injection device is changed into a hydraulic control ball valve, an original valve seat which is switched by gravity is changed into a hydraulic control ball valve which is switched by hydraulic pressure, each hydraulic control actuator is linked with an electro-hydraulic reversing device of an injection pump, a left slurry inlet valve and a right slurry outlet valve receive signals of a right stroke switch at the same time, and a right slurry inlet valve and a left slurry outlet valve receive electric signals of the left stroke switch at the same time. The device solves the problem that the slurry inlet valve cannot be closed under the condition that the slurry inlet is high pressure, and meanwhile, the opening and closing of the hydraulic ball valve is in a reversing chain reaction with the hydraulic oscillator, is a forced switch and cannot be influenced by the change of the slurry inlet pressure.
Description
Technical Field
The invention belongs to the technical field of high-pressure injection equipment of oil field polymers, and particularly relates to a hydraulic control linkage pressurization injection device.
Background
In the technical field of petroleum extraction, the pressure of a part of polymer injection wells is increased in the water injection process of an oil field, the injection mode of one pump on the existing market to a plurality of wells cannot meet the injection requirement of individual high-pressure wells, the injection solution firstly enters the well with lower pressure mainly because the pressure of the outlet of the injection pump is certain, all wells in a pipe network must be boosted to ensure the injection amount of the part of high-pressure wells, therefore, the requirement on the power of the injection pump is higher, the injection pump must be replaced, meanwhile, the pressure level of the pipeline from the injection pump to a well mouth is correspondingly increased, and the replacement investment is higher. The existing slurry inlet and outlet valve inside the injection pump on the market is a valve body and a valve seat type, the slurry inlet valve body is completely closed by self gravity, the vacuum pressure formed by liquid absorption of a piston and the pressure of water in a liquid preparation tank are mainly opened, the pressure values of the vacuum pressure and the pressure of the water in the liquid preparation tank are smaller, the structure has the problem that the valve body cannot be smoothly returned to be closed under the self gravity after being opened, the structure cannot meet the use condition when the slurry inlet is high pressure, and therefore the application of the profile control injection pump in the field of water injection and polymer injection is also restricted.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the hydraulic control linkage pressurization injection device which is simple in structural design and novel in design, the linkage pressurization injection device can be controlled through an oil way, all slurry inlet and outlet ball valves are hydraulic control ball valves, and the pressurization injection of an oil well can be realized in a high-pressure state and a low-pressure state.
In order to achieve the technical purpose, the invention adopts the following scheme: a hydraulic control linkage pressurization injection device comprises a fixed seat, wherein an oil tank is arranged on the fixed seat, the oil tank is connected with a hydraulic piston driving pump through a filtering device, and the hydraulic piston driving pump is connected with a first four-way reversing valve through a pipeline; the upper part of the first four-way reversing valve is provided with a hydraulic oscillator, and the hydraulic oscillator consists of a piston driving part in the middle and liquid supply executing parts on the left side and the right side;
each liquid supply execution part is connected with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected with an external liquid storage device, and the liquid outlet pipe is connected with a well mouth;
the liquid inlet pipe and the liquid outlet pipe on each liquid supply execution part are both connected with a liquid control valve, the two slurry inlet valves and the two slurry outlet valves which are arranged on the liquid inlet pipe and the liquid outlet pipe are both arranged in a one-way mode, when the liquid supply execution part acts, the liquid supply execution part can only realize the conduction of the liquid inlet pipe towards the liquid supply execution part, and the liquid supply execution part towards the liquid outlet pipe;
the oil tank is provided with a reversing valve oil supply pump, and the reversing valve oil supply pump is connected with a second four-way reversing valve and a third four-way reversing valve; the second four-way reversing valve is respectively connected with a slurry inlet valve and a slurry outlet valve on the left liquid supply execution part, and the third four-way reversing valve is respectively connected with a slurry inlet valve and a slurry outlet valve on the right liquid supply execution part;
and the first four-way reversing valve, the second four-way reversing valve and the third four-way reversing valve operate in a linkage manner.
A second energy accumulator is arranged between the oil supply pump of the reversing valve and the four-way reversing valve, and energy is quickly released at the moment of reversing of the control system, so that the reversing valve finishes reversing in the shortest time.
The liquid inlet pipe and the liquid outlet pipe are both high-pressure pipes.
The hydraulic piston drive pump is connected with a one-way valve on a pipeline from the hydraulic piston drive pump to the first four-way reversing valve, an energy accumulator and an overflow valve are connected between the one-way valve and the first four-way reversing valve, and one end of the first four-way reversing valve is connected with an oil tank.
After the invention is designed by adopting the scheme, the invention has the advantages as follows:
the original slurry inlet and outlet valve of the hydraulic control linkage pressurization injection device is changed into a hydraulic control ball valve, the original valve seat depending on a gravity switch is changed into a hydraulic control ball valve depending on a hydraulic switch for control, each hydraulic control actuator is linked with an electro-hydraulic reversing device of an injection pump, the left slurry inlet valve and the right slurry outlet valve receive signals of a right travel switch simultaneously, and the right slurry inlet valve and the left slurry outlet valve receive electrical signals of the left travel switch simultaneously. The device solves the problem that the slurry inlet valve cannot be closed under the condition that the slurry inlet is high pressure, and meanwhile, the opening and closing of the hydraulic ball valve is in a reversing chain reaction with the hydraulic oscillator, is a forced switch and cannot be influenced by the change of the slurry inlet pressure.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic diagram of an oil path control structure according to the present invention;
FIG. 4 is a schematic diagram of an independent structure of a hydraulic oscillator according to the present invention;
in the drawing, 1, a fixed seat, 2, a slurry inlet, 20, a pressure transmitting and flow metering device, 3, a slurry outlet, 4, a left slurry outlet valve, 5, a left slurry inlet valve, 6, a right slurry inlet valve, 7, a right slurry outlet valve, 8, an oil tank, 9, a reversing valve oil supply pump, 10, a second energy accumulator, 11, a second four-way reversing valve, 12, a third four-way reversing valve, 13, a first four-way reversing valve, 14, an overflow valve, 15, a hydraulic oscillator, 16, a liquid inlet pipe, 17, a liquid outlet pipe, 18, a first energy accumulator, 19, a filtering device, 20, a hydraulic piston driving pump, 21, a one-way valve, 22, a right stroke switch, 23, a piston driving part, 24, a left liquid supply executing part, 25, a right liquid supply executing part, 26, a driving piston, 27, a right hydraulic piston, 28, a left hydraulic piston, 29 and a left stroke switch.
Detailed Description
Referring to the figures, the hydraulic control linkage pressurization injection device comprises a fixed seat 1, wherein an oil tank 8 is arranged on the fixed seat 1, the oil tank 8 is connected with a hydraulic piston driving pump 20 through a filtering device 19, and the hydraulic piston driving pump 20 is connected with a first four-way reversing valve 13 through a pipeline; the upper portion of the first four-way reversing valve 13 is connected with a hydraulic oscillator 15, as shown in fig. 3 and 4, the hydraulic oscillator 15 is composed of a piston driving portion 23 in the middle and liquid supply executing portions on the left and right sides, a driving piston 26 is arranged in the piston driving portion 23, the left and right sides of the driving piston 26 are respectively connected with two oil outlets of the first four-way reversing valve 13, the liquid supply executing portions on the left and right sides are symmetrically arranged, taking the left liquid supply executing portion 24 as an example, a left hydraulic piston 28 is arranged in the left hydraulic piston, and the left hydraulic piston 28 is integrated with the driving piston 26 and a right hydraulic piston 27 in the right liquid supply executing portion 25;
the left side liquid supply execution part 24 and the right side liquid supply execution part 25 are both connected with a liquid inlet pipe 16 and a liquid outlet pipe 17, the liquid inlet pipe 16 is connected with an external liquid storage device through a slurry inlet 2, and the liquid outlet pipe 17 is connected with an external wellhead through a slurry outlet 3; because the external liquid storage device or the high-pressure liquid is adopted, the liquid inlet pipe 16 and the liquid outlet pipe 17 are high-pressure pipes in order to adapt to the internal pressure. The slurry inlet 2 and the slurry outlet 3 are provided with pressure transmitting and flow metering devices 20, the internal flow of the hydraulic control linkage pressurization injection device can be monitored at any time by the arrangement mode, the pressurization is prevented from being abnormal, and the hydraulic pressure generated in the automatic operation process can be automatically adjusted to prevent accidents.
A left slurry inlet valve 5 is arranged on the liquid inlet pipe 16 on the left liquid supply execution part 24, and a left slurry outlet valve 4 is connected on the liquid outlet pipe 17 on the left liquid supply execution part 24; a right slurry inlet valve 6 is arranged on a liquid inlet pipe 16 on the right liquid supply execution part 25, a right slurry outlet valve 7 is connected on a liquid outlet pipe 17 on the right liquid supply execution part 25, the slurry inlet valve and the slurry outlet valve are arranged in a one-way mode, and when the liquid supply execution part acts, the liquid supply execution part can only realize the conduction from the liquid inlet pipe 16 to the liquid supply execution part and from the liquid supply execution part to the liquid outlet pipe 17;
the actions of the left slurry inlet valve 5 and the left slurry outlet valve 4, the right slurry inlet valve 6 and the right slurry outlet valve 7 are controlled by a reversing valve, and the control structure is described as follows:
a reversing valve oil supply pump 9 is arranged on the oil tank 8, and a second four-way reversing valve 11 and a third four-way reversing valve 12 are connected to the reversing valve oil supply pump 9; the second four-way reversing valve 11 is respectively connected with a left slurry inlet valve 5 and a left slurry outlet valve 4, and the third four-way reversing valve 12 is respectively connected with a right slurry inlet valve 6 and a right slurry outlet valve 7; on the basis of the above connection, when it is to be noted that, the first four-way selector valve 13, the second four-way selector valve 11, and the third four-way selector valve 12 described above operate in conjunction. And a second energy accumulator 10 is arranged between the reversing valve oil supply pump 9 and the second four-way reversing valve 11 as well as the third four-way reversing valve 12, and has the function of quickly releasing energy at the moment of reversing of the control system, so that the second four-way reversing valve 11 and the third four-way reversing valve 12 complete reversing actions in the shortest time.
When the hydraulic control linkage pressurization injection device works, hydraulic oil is filtered by the hydraulic piston driving pump 20 through the filtering device 19, enters the first four-way reversing valve 13 through the one-way valve 21 and then enters the piston driving part 23 of the hydraulic oscillator 15, at the moment, the first four-way reversing valve 13, the second four-way reversing valve 11 and the third four-way reversing valve 12 operate in a linkage manner, when the driving piston 26 moves rightwards, as shown in fig. 3 and 4, the right hydraulic piston 27 and the left hydraulic piston 28 simultaneously operate rightwards, at the moment, under the hydraulic pushing of the second four-way reversing valve 11 and the third four-way reversing valve 12, the left slurry outlet valve 4 is closed, the left slurry inlet valve 5 is opened, the right slurry inlet valve 6 is closed, and the right slurry outlet valve 7 is opened, so that the liquid injection to an external wellhead is realized;
the right-side travel switch 22 is arranged in the working area of the hydraulic oscillator 15 corresponding to the right-side hydraulic piston 27, when the right-side hydraulic piston 27 touches the right-side travel switch 22, the first four-way reversing valve 13 is switched on by an electric transposition, at the moment, the right-side hydraulic piston 27 and the left-side hydraulic piston 28 simultaneously run leftwards, the left-side slurry outlet valve 4 is opened under the hydraulic pushing action of the second four-way reversing valve 11 and the third four-way reversing valve 12, the left-side slurry inlet valve 5 is closed, the right-side slurry inlet valve 6 is opened, the right-side slurry outlet valve 7 is closed, the injection of the external wellhead is realized, when the left-side hydraulic piston 28 touches the left-side travel switch 29, the first four-way reversing valve 13 is switched on by the electric transposition, and. In order to ensure that the hydraulic power of the second four-way reversing valve 11 and the third four-way reversing valve 12 is stable during the above actions, as shown in fig. 2, the second accumulator 10 is arranged on the front side of the second four-way reversing valve 11 and the third four-way reversing valve 12, and the reversing of the reversing valves can be rapidly and stably carried out through the above structural arrangement.
Further, a first energy accumulator 18 and an overflow valve 14 are connected between the check valve 21 and the first four-way reversing valve 13, the arrangement purpose of the overflow valve is to realize instant recovery of energy generated when the first four-way reversing valve 13 reverses, prevent the check valve 21 and the first four-way reversing valve 13 from being damaged under high pressure, the overflow valve 14 is used for realizing overflow protection of the first four-way reversing valve 13, and one end of the first four-way reversing valve 13 is connected with an oil tank 8, so that hydraulic release under a non-operation state can be realized.
To summarize: the original slurry inlet and outlet valve of the hydraulic control linkage pressurization injection device is changed into a hydraulic control ball valve, the original valve seat depending on a gravity switch is changed into a hydraulic control ball valve depending on a hydraulic switch for control, each hydraulic control actuator is linked with an electro-hydraulic reversing device of an injection pump, the left slurry inlet valve and the right slurry outlet valve receive signals of a right travel switch simultaneously, and the right slurry inlet valve and the left slurry outlet valve receive electrical signals of the left travel switch simultaneously. The device solves the problem that the slurry inlet valve cannot be closed under the condition that the slurry inlet is high pressure, and meanwhile, the opening and closing of the hydraulic ball valve is in a reversing chain reaction with the hydraulic oscillator, is a forced switch and cannot be influenced by the change of the slurry inlet pressure.
Claims (4)
1. The utility model provides a hydraulically controlled linkage pressure boost injection device which characterized in that: a hydraulic control linkage pressurization injection device comprises a fixed seat, wherein an oil tank is arranged on the fixed seat, the oil tank is connected with a hydraulic piston driving pump through a filtering device, and the hydraulic piston driving pump is connected with a first four-way reversing valve through a pipeline; the upper part of the first four-way reversing valve is provided with a hydraulic oscillator, and the hydraulic oscillator consists of a piston driving part in the middle and liquid supply executing parts on the left side and the right side;
each liquid supply execution part is connected with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected with an external liquid storage device, and the liquid outlet pipe is connected with a well mouth; a pressure transmitting and flow metering device is arranged between the liquid inlet pipe and the external liquid storage device; a pressure transmitting and flow metering device is also arranged between the liquid outlet pipe and the wellhead;
the liquid inlet pipe and the liquid outlet pipe on each liquid supply execution part are both connected with a liquid control valve, the two slurry inlet valves and the two slurry outlet valves which are arranged on the liquid inlet pipe and the liquid outlet pipe are both arranged in a one-way mode, when the liquid supply execution part acts, the liquid supply execution part can only realize the conduction of the liquid inlet pipe towards the liquid supply execution part, and the liquid supply execution part towards the liquid outlet pipe;
the oil tank is provided with a reversing valve oil supply pump, and the reversing valve oil supply pump is connected with a second four-way reversing valve and a third four-way reversing valve; the second four-way reversing valve is respectively connected with a slurry inlet valve and a slurry outlet valve on the left liquid supply execution part, and the third four-way reversing valve is respectively connected with a slurry inlet valve and a slurry outlet valve on the right liquid supply execution part;
and the first four-way reversing valve, the second four-way reversing valve and the third four-way reversing valve operate in a linkage manner.
2. The hydraulically controlled linked pressurized injection device of claim 1, wherein: a second energy accumulator is arranged between the oil supply pump of the reversing valve and the four-way reversing valve, and energy is quickly released at the moment of reversing of the control system, so that the reversing valve finishes reversing in the shortest time.
3. The hydraulically controlled linked pressurized injection device of claim 1, wherein: the liquid inlet pipe and the liquid outlet pipe are both high-pressure pipes.
4. The hydraulically controlled linked pressurized injection device of claim 1, wherein: the hydraulic piston drive pump is connected with a one-way valve on a pipeline from the hydraulic piston drive pump to the first four-way reversing valve, an energy accumulator and an overflow valve are connected between the one-way valve and the first four-way reversing valve, and one end of the first four-way reversing valve is connected with an oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010092974.2A CN111120242A (en) | 2020-02-14 | 2020-02-14 | Hydraulic control linkage pressurization injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010092974.2A CN111120242A (en) | 2020-02-14 | 2020-02-14 | Hydraulic control linkage pressurization injection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111120242A true CN111120242A (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010092974.2A Pending CN111120242A (en) | 2020-02-14 | 2020-02-14 | Hydraulic control linkage pressurization injection device |
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| Country | Link |
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| CN (1) | CN111120242A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520305A (en) * | 2020-07-06 | 2020-08-11 | 沈阳风正技术发展有限公司 | Secondary booster pump for oilfield water injection |
| CN114922587A (en) * | 2022-05-31 | 2022-08-19 | 德州华海石油机械股份有限公司 | Oil field oil sludge injection equipment with self-cleaning function |
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| CN102383769A (en) * | 2011-10-14 | 2012-03-21 | 上海大学 | Power compensation type hydraulic pressurizing water injection system |
| CN104061142A (en) * | 2014-06-25 | 2014-09-24 | 东营市天亿石油工具制造有限公司 | Hydraulically-driven oil well pump and oil recovery device |
| CN108644084A (en) * | 2018-05-18 | 2018-10-12 | 东莞海特帕沃液压科技有限公司 | A kind of slush pump of hydraulic-driven |
| CA3072526A1 (en) * | 2018-04-23 | 2019-10-31 | China University Of Mining And Technology | Multipurpose multi-stage hydraulic pressurizer with variable pressurization rate |
| CN211874670U (en) * | 2020-02-14 | 2020-11-06 | 德州学院 | Hydraulic control linkage pressurization injection device |
-
2020
- 2020-02-14 CN CN202010092974.2A patent/CN111120242A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101430252A (en) * | 2008-12-17 | 2009-05-13 | 广东省广州石油机械厂 | Pressure test device |
| CN102383769A (en) * | 2011-10-14 | 2012-03-21 | 上海大学 | Power compensation type hydraulic pressurizing water injection system |
| CN104061142A (en) * | 2014-06-25 | 2014-09-24 | 东营市天亿石油工具制造有限公司 | Hydraulically-driven oil well pump and oil recovery device |
| CA3072526A1 (en) * | 2018-04-23 | 2019-10-31 | China University Of Mining And Technology | Multipurpose multi-stage hydraulic pressurizer with variable pressurization rate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520305A (en) * | 2020-07-06 | 2020-08-11 | 沈阳风正技术发展有限公司 | Secondary booster pump for oilfield water injection |
| CN114922587A (en) * | 2022-05-31 | 2022-08-19 | 德州华海石油机械股份有限公司 | Oil field oil sludge injection equipment with self-cleaning function |
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