CN107191160B - Double-plunger submersible diaphragm pump system and relay lifting method thereof - Google Patents
Double-plunger submersible diaphragm pump system and relay lifting method thereof Download PDFInfo
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- CN107191160B CN107191160B CN201710393898.7A CN201710393898A CN107191160B CN 107191160 B CN107191160 B CN 107191160B CN 201710393898 A CN201710393898 A CN 201710393898A CN 107191160 B CN107191160 B CN 107191160B
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- plunger
- hydraulic oil
- cavity
- submersible
- submersible motor
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 230000009471 action Effects 0.000 claims abstract description 9
- 239000010720 hydraulic oil Substances 0.000 claims description 143
- 239000003921 oil Substances 0.000 claims description 31
- 230000009467 reduction Effects 0.000 claims description 30
- 230000001502 supplementing effect Effects 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000009977 dual effect Effects 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 8
- 239000003129 oil well Substances 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
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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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
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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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
Abstract
The invention discloses a double-plunger submersible diaphragm pump system, which comprises an upper-stage plunger module and a lower-stage plunger module; the upper-stage plunger module and the lower-stage plunger module are driven by the same submersible motor; the submersible motor shaft of the submersible motor rotates to drive the upper-stage plunger and the lower-stage plunger to reciprocate reversely; the reciprocating motion of the upper plunger drives the diaphragm to move up and down, so that positive pressure or negative pressure is generated in the well fluid accommodating cavity above the diaphragm; through the switching action of positive and negative pressure in the well liquid accommodating cavity, outside well liquid is sucked into the well liquid accommodating cavity and then discharged into the oil pipe, so that the well liquid is lifted to the ground through the oil pipe. The invention can greatly improve the lift parameter and further improve the overall efficiency of the submersible diaphragm pump on the premise of ensuring the constant discharge capacity, thereby enabling the submersible diaphragm pump to be applied to low-yield oil wells. The invention also discloses a relay lifting method of the double-plunger submersible diaphragm pump system.
Description
Technical Field
The invention relates to oil extraction equipment in an oil field, in particular to a double-plunger submersible diaphragm pump system. The invention also relates to a relay lifting method of the double-plunger submersible diaphragm pump system.
Background
With the deep development of various oil fields at home and abroad, a large number of oil wells start to enter a low-yield stage, and high-yield oil extraction equipment such as an electric submersible pump is not suitable for the actual conditions of the oil wells. Meanwhile, with the national importance of energy conservation and emission reduction, the efficiency of oil extraction equipment is also more and more important.
The submersible diaphragm pump is low-yield and high-efficiency petroleum lifting equipment, and the energy consumption of the submersible diaphragm pump is only half of that of the pumping unit under the same displacement and lift conditions, so that the submersible diaphragm pump is adopted for exploitation of a low-yield oil well, and the submersible diaphragm pump has very obvious effects on energy conservation and emission reduction.
However, since the displacement of the submersible diaphragm pump is basically inversely proportional to the lift, the lift is reduced along with the displacement is increased, so that the existing submersible diaphragm pump has the defect of low lift, and the lift of the submersible diaphragm pump with the maximum displacement is only 600 meters. The submersible diaphragm pump is limited by the lift parameters and cannot meet the application requirements of most oil wells.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-plunger submersible diaphragm pump system, which can greatly improve the lift of the double-plunger submersible diaphragm pump system on the premise of ensuring constant discharge capacity.
In order to solve the technical problems, the technical solution of the double-plunger submersible diaphragm pump system is as follows:
the device comprises an upper-stage plunger module and a lower-stage plunger module; the upper-stage plunger module and the lower-stage plunger module are driven by the same submersible motor; the upper plunger module comprises an upper joint 22, a cylinder sleeve 4 is fixedly arranged in the upper joint 22, and an upper plunger 6 is movably arranged in the cylinder sleeve 4; a working cavity is formed above the cylinder sleeve 4, and a diaphragm 3 is fixedly arranged in the working cavity; the lower-stage plunger module comprises a lower joint 23, and a lower-stage plunger 18 is movably arranged in the lower joint 23; the lower plunger 18 is connected with the push rod 17; a negative pressure cavity VI is formed around the push rod 17; the upper plunger 6 is connected with the upper end of a submersible motor shaft 14 of the submersible motor through an upper motion conversion mechanism; the lower end of the submersible motor shaft 14 is connected with a push rod 17 through a lower motion conversion mechanism; the up-and-down motion conversion mechanism can convert the vertical rotation motion of the submersible motor shaft 14 into horizontal rotation motion and convert the horizontal rotation motion into up-and-down reciprocation motion; the upper motion conversion mechanism is positioned in the upper hydraulic oil working cavity III; the lower motion conversion mechanism is positioned in the lower hydraulic oil working cavity II; the upper hydraulic oil working cavity III is communicated with the lower hydraulic oil working cavity II; a lower spring receiving chamber is formed below the lower plunger 18; the lower spring accommodating cavity is communicated with the lower hydraulic oil working cavity II through a hydraulic oil balance oil duct 32; the submersible motor shaft 14 of the submersible motor rotates to drive the upper-stage plunger 6 and the lower-stage plunger 18 to reciprocate reversely; the reciprocating motion of the upper plunger 6 drives the diaphragm 3 to move up and down, so that positive pressure or negative pressure is generated in the well fluid accommodating cavity V above the diaphragm 3; through the switching action of positive and negative pressure in the well liquid accommodating cavity V, outside well liquid is sucked into the well liquid accommodating cavity V and then discharged into the oil pipe 25, so that the well liquid is lifted to the ground through the oil pipe; when the upper plunger 6 moves upward, the upper plunger 6 is subjected to both the pressurizing action by the lower plunger module and the driving force of the submersible motor shaft 14.
When the upper plunger 6 is driven by the submersible motor shaft 14 to move upwards, the submersible motor shaft 14 drives the push rod 17 and the lower plunger 18 to move downwards, so that the volume of a lower spring accommodating cavity is reduced, hydraulic oil in the lower spring accommodating cavity flows into a lower hydraulic oil working cavity II through a hydraulic oil balance oil duct 32, and the pressure in the lower hydraulic oil working cavity II and an upper hydraulic oil working cavity III is increased; the pressure acts on the upper plunger 6 through the lower end face of the upper plunger 6, so that the upper plunger 6 moves upwards, and the pressurizing effect on the upper plunger 6 is realized.
The cross-sectional area of the lower plunger 18 is slightly larger than the sum of the cross-sectional areas of the push rod 17 and the upper plunger 6.
A hydraulic oil storage chamber I is formed below the lower joint 23; the lower hydraulic oil working chamber II is communicated with the hydraulic oil storage chamber I through a hydraulic oil overflow channel 33; an overflow valve 21 is arranged in the hydraulic oil overflow channel 33; the lower spring accommodating cavity is communicated with the hydraulic oil storage cavity I through a hydraulic oil supplementing channel 31; a fluid supplementing valve 19 is arranged in the hydraulic oil fluid supplementing channel 31.
A well liquid containing cavity V is arranged above the diaphragm 3, the well liquid containing cavity V is provided with a well liquid suction inlet 9 and a well liquid discharge outlet 2, the well liquid containing cavity V is communicated with the outside through the well liquid suction inlet 9, and a liquid inlet valve 10 is used for controlling the opening and closing of the well liquid suction inlet 9; the well fluid containing cavity V is communicated with the inner cavity of the oil pipe 25 through the well fluid outlet 2, and the liquid outlet valve 11 is used for controlling the opening and closing of the well fluid outlet 2.
A hydraulic oil accommodating cavity is arranged below the diaphragm 3; the top end of the upper spring 5 is fixedly connected with a spring fixing pipe 24; the upper spring accommodating cavity in which the upper spring 5 is positioned is communicated with the hydraulic oil accommodating cavity through the inner cavity of the spring fixing pipe 24 to form a diaphragm pressure adjusting cavity IV.
The upper motion conversion mechanism comprises an upper speed reduction reversing assembly 7 and an upper pinion 8, the pinion 8 is connected with the upper end of a submersible motor shaft 14, and the pinion 8 is meshed with a large gear of the upper speed reduction reversing assembly 7; the large gear of the upper speed reduction reversing assembly 7 is eccentrically connected with the crankshaft; the crankshaft of the upper speed reduction reversing assembly 7 is connected with the lower end of the upper plunger 6; the top of the upper plunger 6 is connected with an upper spring 5; the upper spring 5 provides a downward force to the upper plunger 6.
The lower motion conversion mechanism comprises a lower speed reduction reversing assembly 16 and a lower pinion 15, the lower pinion 15 is connected with the lower end of the submersible motor shaft 14, and the lower pinion 15 is meshed with a large gear of the lower speed reduction reversing assembly 16; the large gear of the lower speed reduction reversing assembly 16 is eccentrically connected with the crankshaft; the crankshaft of the lower speed reduction reversing assembly 16 is connected with the upper end of the push rod 17; the lower end of the lower plunger 18 is connected with a lower spring 20, and the lower spring 20 provides upward acting force for the lower plunger 18; the lower spring 20 is located within the lower spring receiving chamber.
The submersible motor comprises a submersible motor rotor 12, and the submersible motor rotor 12 is connected with a submersible motor shaft 14; the submersible motor rotor 12 is arranged in the submersible motor stator 13; a gap is formed between the submersible motor rotor 12 and the submersible motor stator 13 to communicate the upper hydraulic oil working chamber iii with the lower hydraulic oil working chamber ii.
The invention also provides a relay lifting method of the double-plunger submersible diaphragm pump system, which adopts the technical proposal that the method comprises the following steps:
the ground driving equipment transmits electric energy from the ground to an underground submersible motor through a submersible cable 1 to drive the submersible motor shaft 14 to rotate; the submersible motor shaft 14 drives the upper-stage plunger 6 and the lower-stage plunger 18 to reciprocate reversely;
while the upper plunger 6 is driven to move upwards by the submersible motor shaft 14, the submersible motor shaft 14 drives the push rod 17 and the lower plunger 18 to move downwards, so that the volume of a lower spring accommodating cavity is reduced, hydraulic oil in the lower spring accommodating cavity flows into a lower hydraulic oil working cavity II through a hydraulic oil balance oil duct 32, and the pressure in the lower hydraulic oil working cavity II and an upper hydraulic oil working cavity III is increased; the pressure acts on the upper plunger 6 through the lower end surface of the upper plunger 6 to enable the upper plunger 6 to move upwards, so that the supercharging effect on the upper plunger 6 is realized;
the upper plunger 6 moves upwards, compresses the upper spring 5, and enables the diaphragm 3 to move upwards, positive pressure is generated in the well fluid accommodating cavity V, the positive pressure forces the liquid outlet valve 11 to be opened, and therefore well fluid in the well fluid accommodating cavity V is discharged into the oil pipe 25 through the well fluid outlet 2;
the lower plunger 18 and the push rod 17 move upwards under the action of the lower spring 20, so that the volume of the lower spring accommodating cavity is increased to generate negative pressure, a part of hydraulic oil is supplemented into the lower spring accommodating cavity through the hydraulic oil balance oil duct 32, and the insufficient part is supplemented into the lower spring accommodating cavity through the hydraulic oil supplementing channel 31 from the hydraulic oil storage cavity I through the hydraulic oil supplementing valve 19; at the same time, the upper plunger 6 moves downward under the action of the upper spring 5, so that the diaphragm 3 moves downward, and negative pressure is generated in the well fluid accommodating cavity V, and the negative pressure forces the liquid inlet valve 10 to open, so that external well fluid is sucked into the well fluid accommodating cavity V through the well fluid suction port 9.
After the pressures in the lower hydraulic oil working chamber ii and the upper hydraulic oil working chamber iii rise to the opening pressure of the relief valve 21, the relief valve 21 is forced to open, and the surplus hydraulic oil in the lower hydraulic oil working chamber ii and the upper hydraulic oil working chamber iii is returned to the hydraulic oil reservoir chamber I through the hydraulic oil relief passage 33 so that the pressures in the lower hydraulic oil working chamber ii and the upper hydraulic oil working chamber iii are maintained at the set values.
The invention has the following technical effects:
the invention can greatly improve the lift parameter under the premise of ensuring the constant discharge capacity, thereby enabling the submersible diaphragm pump to be applied to low-yield and high-lift oil wells.
Compared with a single-stage submersible diaphragm pump, the invention can greatly improve the lift and expand the application range of submersible diaphragm pump products.
Drawings
It will be appreciated by those skilled in the art that the following description is merely illustrative of the principles of the invention, which can be applied in numerous ways to implement many different alternative embodiments. These descriptions are only intended to illustrate the general principles of the teachings of the present invention and are not meant to limit the inventive concepts disclosed herein.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description given above and the detailed description of the drawings given below, serve to explain the principles of the invention.
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of a dual plunger submersible diaphragm pump system of the present invention.
The reference numerals in the drawings illustrate:
1 is a submersible cable, 2 is a well fluid outlet,
3 is a diaphragm, 4 is a cylinder sleeve,
5 is an upper spring, 6 is an upper plunger,
7 is an upper speed-reducing reversing assembly, 8 is an upper pinion,
9 is a well fluid suction inlet, 10 is a fluid inlet valve,
11 is a liquid outlet valve, 12 is a submersible motor rotor,
13 is a submersible motor stator, 14 is a submersible motor shaft,
15 is a lower pinion, 16 is a lower deceleration reversing assembly,
17 is a push rod, 18 is a lower stage plunger,
19 is a fluid supplementing valve, 20 is a lower spring,
21 is an overflow valve, 22 is an upper joint,
23 is a lower joint, 24 is a spring fixing tube,
25 is an oil pipe, and is provided with a plurality of oil pipes,
31 is a hydraulic oil supplementing channel, 32 is a hydraulic oil balancing oil channel,
33 is an overflow passage for the hydraulic oil,
i is a hydraulic oil storage cavity, II is a lower hydraulic oil working cavity,
III is an upper hydraulic oil working cavity, IV is a diaphragm pressure regulating cavity,
v is a well liquid accommodating cavity, VI is a negative pressure cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and the like means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof without precluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.
As shown in fig. 1, the dual-plunger submersible diaphragm pump system of the invention comprises an upper-stage plunger module and a lower-stage plunger module; the upper-stage plunger module and the lower-stage plunger module are driven by the same submersible motor;
the upper plunger module comprises an upper joint 22, a cylinder sleeve 4 is fixedly arranged in the upper joint 22, and an upper plunger 6 is movably arranged in the cylinder sleeve 4; the lower end of the upper plunger 6 is connected with a crankshaft of the upper speed reduction reversing assembly 7, and the crankshaft is eccentrically connected with a large gear; the big gear of the upper speed reduction reversing assembly 7 is meshed with the upper small gear 8; the large gear and the upper small gear 8 form a bevel gear pair, so that vertical rotation motion can be converted into horizontal rotation motion; because the crankshaft of the upper speed reduction reversing assembly 7 is in eccentric connection with the large gear, the large gear can drive the crankshaft to move up and down in the horizontal rotation process, and the crankshaft drives the upper plunger 6 to reciprocate, so that the horizontal rotation is converted into up-and-down reciprocating motion; the upper joint 22 is separated from or integrated with the cylinder liner 4.
The upper speed reduction reversing assembly 7 and the upper pinion 8 are positioned in the upper hydraulic oil working cavity III;
a working cavity is formed above the cylinder sleeve 4, and a diaphragm 3 is fixedly arranged in the working cavity; a well fluid accommodating cavity V is arranged above the diaphragm 3, and a hydraulic oil accommodating cavity is arranged below the diaphragm 3; the well liquid containing cavity V is provided with a well liquid suction inlet 9 and a well liquid discharge outlet 2, the well liquid containing cavity V is communicated with the outside through the well liquid suction inlet 9, and a liquid inlet valve 10 is used for controlling the opening and closing of the well liquid suction inlet 9; the well liquid containing cavity V is communicated with the inner cavity of the oil pipe 25 through the well liquid outlet 2, and the liquid outlet valve 11 is used for controlling the opening and closing of the well liquid outlet 2;
preferably, the top of the upper plunger 6 is connected with an upper spring 5; the upper spring 5 provides downward acting force for the upper plunger 6; the top end of the upper spring 5 is fixedly connected with a spring fixing pipe 24; the upper spring accommodating cavity in which the upper spring 5 is positioned is communicated with the hydraulic oil accommodating cavity through the inner cavity of the spring fixing pipe 24 to form a diaphragm pressure adjusting cavity IV; in the embodiment, an upper spring 5 is adopted to provide downward reset force for an upper plunger 6; of course, the driving force of the submersible motor shaft 14 can be used as the force for driving the upper plunger 6 to move downwards through the connecting rod;
the upper pinion gear 8 of the upper plunger module is connected with the upper end of the submersible motor shaft 14; the submersible motor shaft 14 is fixedly connected with the submersible motor rotor 12, and the submersible motor rotor 12 is arranged in the submersible motor stator 13; the submersible motor rotor 12 and the submersible motor stator 13 form a submersible motor; the submersible motor is powered by a submersible cable 1;
the lower-stage plunger module comprises a lower joint 23, and a lower-stage plunger 18 is movably arranged in the lower joint 23; the lower end of the lower plunger 18 is connected with a lower spring 20, and the upper end of the lower plunger 18 is connected with the lower end of the push rod 17; the upper end of the push rod 17 is connected with a crankshaft of the lower speed reduction reversing assembly 16, and the crankshaft is eccentrically connected with a large gear; the large gear of the lower speed reduction reversing assembly 16 is meshed with the lower small gear 15; the large gear and the lower pinion 15 form a bevel gear pair; the lower pinion 15 of the lower plunger module is connected with the lower end of the submersible motor shaft 14; the lower plunger 18 is separate or integral with the push rod 17.
A closed negative pressure cavity VI is formed between the push rod 17 and the lower joint 23; the sectional area of the lower plunger 18 is slightly larger than the sum of the sectional areas of the push rod 17 and the upper plunger 6; when the push rod 17 and the lower plunger 18 move downwards and the upper plunger 6 moves upwards, the volume reduction of the lower spring accommodating cavity generated by the downward movement of the lower plunger 18 in the process is slightly larger than the sum of the volume increase of the lower hydraulic oil working cavity II generated by the downward movement of the push rod 17 and the volume increase of the upper hydraulic oil working cavity III generated by the upward movement of the upper plunger 6;
the invention makes the sectional area of the lower plunger 18 slightly larger than the sum of the sectional areas of the push rod 17 and the upper plunger 6, and can make the volume increase of the annular negative pressure cavity VI generated by the downward movement of the lower plunger 18 slightly larger than the volume increase of the upper hydraulic oil working cavity III generated by the upward movement of the upper plunger 6, and the rest is used as redundancy to fully ensure that the lower plunger 18 increases the pressure of the inner cavity of the unit (namely the pressure in the lower hydraulic oil working cavity II and the pressure in the upper hydraulic oil working cavity III).
The lower speed reduction reversing assembly 16 and the lower pinion 15 are positioned in the lower hydraulic oil working cavity II;
the lower hydraulic oil working cavity II is communicated with the upper hydraulic oil working cavity III through a gap between the submersible motor rotor 12 and the submersible motor stator 13;
the lower side of the lower joint 23 forms a hydraulic oil storage chamber I;
the lower spring accommodating cavity in which the lower spring 20 is positioned is communicated with the lower hydraulic oil working cavity II through a hydraulic oil balance oil duct 32 arranged in the lower joint 23;
the lower spring accommodating cavity is communicated with the hydraulic oil storage cavity I through a hydraulic oil supplementing channel 31 arranged in the lower joint 23; a fluid supplementing valve 19 is arranged in the hydraulic oil fluid supplementing channel 31;
the hydraulic oil balance oil duct 32 is communicated with the hydraulic oil supplementing channel 31;
the lower hydraulic oil working chamber II is communicated with the hydraulic oil storage chamber I through a hydraulic oil overflow channel 33 arranged in the lower joint 23; the hydraulic oil overflow passage 33 is provided with an overflow valve 21.
The upper and lower deceleration reversing assemblies 7 and 16 of the present invention are used for converting vertical rotation into up-and-down reciprocation, and the present embodiment adopts an eccentric crankshaft and bevel gear pair, and of course, other structures capable of converting vertical rotation into up-and-down reciprocation may be adopted, which will not be described herein.
The working principle of the invention is as follows:
the ground driving equipment transmits electric energy from the ground to an underground submersible motor through the submersible cable 1, so that torque is generated between a submersible motor stator 13 and a submersible motor rotor 12, and a submersible motor shaft 14 is driven to rotate; the submersible motor shaft 14 drives an upper pinion 8 of the upper stage plunger module and a lower pinion 15 of the lower stage plunger module to rotate, and converts vertical rotary motion into up-and-down reciprocating motion through an upper speed reduction reversing assembly 7 and a lower speed reduction reversing assembly 16; the upper pinion 8 of the upper plunger module drives the upper plunger 6 to reciprocate, and the lower pinion 15 of the lower plunger module drives the push rod 17 and the lower plunger 18 to reciprocate; and the movement direction of the upper stage plunger 6 is opposite to that of the lower stage plunger 18;
when the push rod 17 and the lower plunger 18 move downwards, the lower plunger 18 compresses the lower spring 20, so that the volume of the lower spring accommodating cavity is reduced (meanwhile, the volume of the negative pressure cavity VI is increased), and hydraulic oil in the lower spring accommodating cavity flows into the lower hydraulic oil working cavity II through the hydraulic oil balance oil duct 32, so that the pressure in the lower hydraulic oil working cavity II and the upper hydraulic oil working cavity III is increased; the pressure acts on the upper plunger 6 through the lower end face of the upper plunger 6 to enable the upper plunger 6 to move upwards; meanwhile, an upper pinion 8 of the upper plunger module drives an upper plunger 6 to move upwards through an upper speed reduction reversing assembly 7, so that the upper plunger 6 is subjected to the dual functions of the pressurizing function generated by the lower plunger module and the driving force of the submersible motor on the upper plunger 6; the upper plunger 6 moves upwards, compresses the upper spring 5, transmits force to the diaphragm 3 through hydraulic oil, enables the diaphragm 3 to move upwards, generates positive pressure in the well liquid accommodating cavity V, and forces the liquid outlet valve 11 to be opened (simultaneously enables the liquid inlet valve 10 to be closed), so that well liquid in the well liquid accommodating cavity V is discharged into the oil pipe 25 through the well liquid outlet 2;
after the pressures in the lower hydraulic oil working chamber ii and the upper hydraulic oil working chamber iii rise to the opening pressure of the relief valve 21, the relief valve 21 can be forced to open, and the surplus hydraulic oil in the lower hydraulic oil working chamber ii and the upper hydraulic oil working chamber iii can be returned to the hydraulic oil reservoir chamber I through the hydraulic oil relief passage 33 so that the pressures in the lower hydraulic oil working chamber ii and the upper hydraulic oil working chamber iii are maintained at the set values.
When the upper speed reduction reversing assembly 7 and the lower speed reduction reversing assembly 16 are reset, the thrust acting on the push rod 17 and the lower plunger 18 disappears, the push rod 17 and the lower plunger 18 move upwards under the action of the reset elastic force of the lower spring 20, the pressure in the lower hydraulic oil working cavity II and the upper hydraulic oil working cavity III disappears, the volume of the lower spring accommodating cavity is enlarged to generate negative pressure, a part of hydraulic oil is supplemented into the lower spring accommodating cavity through the hydraulic oil balance oil duct 32, and the insufficient part is supplemented into the lower spring accommodating cavity through the hydraulic oil supplementing channel 31 from the hydraulic oil storage cavity I through the hydraulic oil supplementing valve 19;
the upper plunger 6 moves downward under the restoring force of the upper spring 5 or the driving force of the submersible motor, so that the diaphragm 3 moves downward, negative pressure is generated in the well fluid accommodating cavity V, and the negative pressure forces the liquid inlet valve 10 to open (simultaneously, the liquid outlet valve 11 is closed), so that external well fluid is sucked into the well fluid accommodating cavity V through the well fluid suction inlet 9.
According to the invention, the upper-stage plunger 6 and the lower-stage plunger 18 are driven by the submersible motor to do work simultaneously, namely, the upper-stage plunger 6 moves upwards while the lower-stage plunger 18 moves downwards, and the downward movement of the lower-stage plunger 18 can generate upward force on the upper-stage plunger 6 so as to realize a relay lifting effect, so that higher working lift can be achieved compared with a common submersible diaphragm pump.
According to the invention, a negative pressure cavity VI is arranged above a lower plunger 18, when a push rod 17 and the lower plunger 18 move downwards, an upper plunger 6 moves upwards, so that the volumes of a lower hydraulic oil working cavity II and an upper hydraulic oil working cavity III become larger, the volume of a lower spring accommodating cavity becomes smaller, and meanwhile, the negative pressure cavity VI becomes larger; because the negative pressure cavity VI becomes larger, the volume of the lower spring accommodating cavity becomes smaller (namely the oil discharge volume of the lower spring accommodating cavity) to be larger than the volumes of the lower hydraulic oil working cavity II and the upper hydraulic oil working cavity III, so that the volume of liquid flowing in from the lower spring accommodating cavity is larger than the volume change of the lower hydraulic oil working cavity II and the upper hydraulic oil working cavity III, and finally the pressure in the lower hydraulic oil working cavity II and the upper hydraulic oil working cavity III becomes larger.
While embodiments of the present invention have been described in detail hereinabove, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. It is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (10)
1. A dual plunger submersible diaphragm pump system characterized by: the device comprises an upper-stage plunger module and a lower-stage plunger module; the upper-stage plunger module and the lower-stage plunger module are driven by the same submersible motor;
the upper-stage plunger module comprises an upper joint (22), a cylinder sleeve (4) is fixedly arranged in the upper joint (22), and an upper-stage plunger (6) is movably arranged in the cylinder sleeve (4); a working cavity is formed above the cylinder sleeve (4), and a diaphragm (3) is fixedly arranged in the working cavity;
the lower-stage plunger module comprises a lower joint (23), and a lower-stage plunger (18) is movably arranged in the lower joint (23); the lower plunger (18) is connected with the push rod (17); a negative pressure cavity (VI) is formed around the push rod (17);
the upper plunger (6) is connected with the upper end of a submersible motor shaft (14) of the submersible motor through an upper motion conversion mechanism; the lower end of the submersible motor shaft (14) is connected with a push rod (17) through a downward motion conversion mechanism; the up-and-down motion conversion mechanism can convert vertical rotation motion of the submersible motor shaft (14) into horizontal rotation motion and convert the horizontal rotation motion into up-and-down reciprocating motion;
the upper motion conversion mechanism is positioned in the upper hydraulic oil working cavity (III); the lower motion conversion mechanism is positioned in the lower hydraulic oil working cavity (II); the upper hydraulic oil working cavity (III) is communicated with the lower hydraulic oil working cavity (II);
a lower spring accommodating cavity is formed below the lower plunger (18); the lower spring accommodating cavity is communicated with the lower hydraulic oil working cavity (II) through a hydraulic oil balance oil duct (32);
an oil-submersible motor shaft (14) of the oil-submersible motor rotates to drive an upper plunger (6) and a lower plunger (18) to reciprocate reversely; the reciprocating motion of the upper plunger (6) drives the diaphragm (3) to move up and down, so that positive pressure or negative pressure is generated in the well fluid accommodating cavity (V) above the diaphragm (3); through the switching action of positive and negative pressure in the well liquid accommodating cavity (V), outside well liquid is sucked into the well liquid accommodating cavity (V) and then discharged into the oil pipe (25), so that the well liquid is lifted to the ground through the oil pipe;
when the upper plunger (6) moves upwards, the upper plunger (6) is subjected to the dual functions of the pressurizing effect generated by the lower plunger module and the driving force of the submersible motor shaft (14).
2. The dual plunger submersible diaphragm pump system of claim 1, wherein: when the upper plunger (6) is driven by the submersible motor shaft (14) to move upwards, the submersible motor shaft (14) drives the push rod (17) and the lower plunger (18) to move downwards, so that the volume of a lower spring accommodating cavity is reduced, hydraulic oil in the lower spring accommodating cavity flows into a lower hydraulic oil working cavity (II) through a hydraulic oil balance oil duct (32), and the pressure in the lower hydraulic oil working cavity (II) and the upper hydraulic oil working cavity (III) is increased; the pressure acts on the upper plunger (6) through the lower end face of the upper plunger (6), so that the upper plunger (6) moves upwards, and the supercharging effect on the upper plunger (6) is realized.
3. The dual plunger submersible diaphragm pump system of claim 1 or 2, wherein: the sectional area of the lower-stage plunger (18) is slightly larger than the sum of the sectional areas of the push rod (17) and the upper-stage plunger (6).
4. The dual plunger submersible diaphragm pump system of claim 1, wherein: a hydraulic oil storage cavity (I) is formed below the lower joint (23); the lower hydraulic oil working cavity (II) is communicated with the hydraulic oil storage cavity (I) through a hydraulic oil overflow channel (33); an overflow valve (21) is arranged in the hydraulic oil overflow channel (33); the lower spring accommodating cavity is communicated with the hydraulic oil storage cavity (I) through a hydraulic oil supplementing channel (31); a fluid supplementing valve (19) is arranged in the hydraulic oil fluid supplementing channel (31).
5. The dual plunger submersible diaphragm pump system of claim 1, wherein: the upper part of the diaphragm (3) is provided with a well liquid accommodating cavity (V), the well liquid accommodating cavity (V) is provided with a well liquid suction inlet (9) and a well liquid discharge outlet (2), the well liquid accommodating cavity (V) is communicated with the outside through the well liquid suction inlet (9), and a liquid inlet valve (10) is used for controlling the opening and closing of the well liquid suction inlet (9); the well liquid containing cavity V is communicated with the inner cavity of the oil pipe (25) through the well liquid outlet (2), and the liquid outlet valve (11) is used for controlling the opening and closing of the well liquid outlet (2).
6. The dual plunger submersible diaphragm pump system of claim 1 or 4, wherein: a hydraulic oil accommodating cavity is arranged below the diaphragm (3); the top end of the upper spring (5) is fixedly connected with a spring fixing pipe (24); the upper spring accommodating cavity where the upper spring (5) is located is communicated with the hydraulic oil accommodating cavity through the inner cavity of the spring fixing pipe (24) to form a diaphragm pressure adjusting cavity (IV).
7. The dual plunger submersible diaphragm pump system of claim 1, wherein: the upper motion conversion mechanism comprises an upper speed reduction reversing assembly (7) and an upper pinion (8), the pinion (8) is connected with the upper end of a submersible motor shaft (14), and the pinion (8) is meshed with a large gear of the upper speed reduction reversing assembly (7); the big gear of the upper speed reduction reversing assembly (7) is eccentrically connected with the crankshaft; the crankshaft of the upper speed reduction reversing assembly (7) is connected with the lower end of the upper plunger (6); the top of the upper plunger (6) is connected with an upper spring (5); the upper spring (5) provides downward acting force for the upper plunger (6); the lower motion conversion mechanism comprises a lower speed reduction reversing assembly (16) and a lower pinion (15), the lower pinion (15) is connected with the lower end of the submersible motor shaft (14), and the lower pinion (15) is meshed with a large gear of the lower speed reduction reversing assembly (16); the big gear of the lower speed reduction reversing assembly (16) is eccentrically connected with the crankshaft; the crankshaft of the lower speed reduction reversing assembly (16) is connected with the upper end of the push rod (17); the lower end of the lower plunger (18) is connected with a lower spring (20), and the lower spring (20) provides upward acting force for the lower plunger (18); a lower spring (20) is positioned within the lower spring receiving cavity.
8. The dual plunger submersible diaphragm pump system of claim 1, wherein: the submersible motor comprises a submersible motor rotor (12), and the submersible motor rotor (12) is connected with a submersible motor shaft (14); the submersible motor rotor (12) is arranged in the submersible motor stator (13); a gap is formed between the submersible motor rotor (12) and the submersible motor stator (13) so as to communicate an upper hydraulic oil working chamber III with a lower hydraulic oil working chamber II.
9. A method of relay lifting of a dual plunger submersible diaphragm pump system of claim 1, comprising the steps of:
the ground driving equipment transmits electric energy from the ground to an underground submersible motor through a submersible cable (1) to drive the submersible motor shaft (14) to rotate; the submersible motor shaft (14) drives the upper-stage plunger (6) and the lower-stage plunger (18) to reciprocate reversely;
at the same time of the upward movement of the upper plunger (6) driven by the submersible motor shaft (14), the submersible motor shaft (14) drives the push rod (17) and the lower plunger (18) to move downwards, so that the volume of a lower spring accommodating cavity is reduced, hydraulic oil in the lower spring accommodating cavity flows into a lower hydraulic oil working cavity (II) through a hydraulic oil balance oil duct (32), and the pressure in the lower hydraulic oil working cavity (II) and the upper hydraulic oil working cavity (III) is increased; the pressure acts on the upper plunger (6) through the lower end surface of the upper plunger (6), so that the upper plunger (6) moves upwards, and the supercharging effect on the upper plunger (6) is realized;
the upper plunger (6) moves upwards, compresses the upper spring (5) and enables the diaphragm (3) to move upwards, positive pressure is generated in the well liquid accommodating cavity (V), and the positive pressure forces the liquid outlet valve (11) to be opened, so that well liquid in the well liquid accommodating cavity (V) is discharged into the oil pipe (25) through the well liquid outlet (2);
the lower plunger (18) and the push rod (17) move upwards under the action of the lower spring (20), so that the volume of the lower spring accommodating cavity is increased to generate negative pressure, a part of hydraulic oil is supplemented into the lower spring accommodating cavity through a hydraulic oil balance oil duct (32), and the insufficient part is supplemented into the lower spring accommodating cavity from the hydraulic oil storage cavity (I) through a hydraulic oil supplementing channel (31) through a hydraulic oil supplementing valve (19); at the same time, the upper plunger (6) moves downwards under the action of the upper spring (5), so that the diaphragm (3) moves downwards, negative pressure is generated in the well liquid accommodating cavity (V), and the negative pressure forces the liquid inlet valve (10) to open, so that external well liquid is sucked into the well liquid accommodating cavity (V) through the well liquid suction inlet (9).
10. The relay lifting method of the double-plunger submersible diaphragm pump system according to claim 9, wherein the relay lifting method comprises the following steps: after the pressure in the lower hydraulic oil working chamber (II) and the upper hydraulic oil working chamber (III) rises to the opening pressure of the overflow valve (21), the overflow valve (21) is forced to be opened, and redundant hydraulic oil in the lower hydraulic oil working chamber (II) and the upper hydraulic oil working chamber (III) is returned to the hydraulic oil storage chamber (I) through the hydraulic oil overflow channel (33), so that the pressure in the lower hydraulic oil working chamber (II) and the upper hydraulic oil working chamber (III) is maintained at the set value.
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| CN201710393898.7A CN107191160B (en) | 2017-05-28 | 2017-05-28 | Double-plunger submersible diaphragm pump system and relay lifting method thereof |
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| WO2007040421A1 (en) * | 2005-10-03 | 2007-04-12 | Bondarenko, Oleg Nikolaevich | Downhole electric driven pump unit |
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| CN106523334A (en) * | 2014-05-27 | 2017-03-22 | 张勇 | Oil field downhole mechanical oil extraction device |
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Address after: Room 401, Building 2 and Room 102, Building 4, No. 1618 Xinyang Road, Fengxian District, Shanghai, 2014 Patentee after: Shanghai Feizhou Boyuan Material Technology Co.,Ltd. Patentee after: SHANGHAI JUMA PETROLEUM TECHNOLOGY SERVICE Co.,Ltd. Address before: 201413 Room 401, building 2, 1618 Xinyang Road, Fengxian District, Shanghai Patentee before: Shanghai Feizhou Boyuan Petroleum Equipment Co.,Ltd. Patentee before: SHANGHAI JUMA PETROLEUM TECHNOLOGY SERVICE Co.,Ltd. |
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