CN103362796A - Load-shedding oil well pump for deep well - Google Patents
Load-shedding oil well pump for deep well Download PDFInfo
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- CN103362796A CN103362796A CN 201210104463 CN201210104463A CN103362796A CN 103362796 A CN103362796 A CN 103362796A CN 201210104463 CN201210104463 CN 201210104463 CN 201210104463 A CN201210104463 A CN 201210104463A CN 103362796 A CN103362796 A CN 103362796A
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Abstract
The invention relates to a load-shedding oil well pump for a deep well, which comprises a pump body and a pump base, wherein the pump body comprises an outlet valve, a plunger system, a travelling valve, a standing valve and a pump cylinder; and the pump base comprises an upper pump base coupling, a sealing rubber ring, a clamp ring and a middle pump base coupling. According to the oil well pump, through slidingly sealing matching between a sliding pipe and a sliding sleeve, the upper part of the oil well pump is isolated from the lower part of the oil well pump to form an upper part high-pressure area and a lower part pressure change area, so that pressure force of liquid at the upper part of the pump is prevented from directly acting on the upper end face of a plunger, and the pressure force on the upper end face of the plunger is shed. A hole is formed in the upper part of the pump cylinder, the upper end face of the plunger is communicated with the exterior of the pump, and a difference value between pressure of the upper end face of the plunger and pressure of the lower end face of the plunger is quite small, so that upside resistance of the plunger is very small, and a load of a pumping unit is very small. The oil well pump has the advantages that the oil well pump is small in load, labor-saving and energy-saving, and the oil well pumps in the same specification can go down by hundreds of meters, so that an oil extraction yield is increased greatly.
Description
Technical field
The present invention relates to the oil well pump that uses in a kind of oilfield, particularly a kind ofly load little, laborsaving, energy-conservation and can deeply lower off-load type deep-well oil well pump more than 300 meters, belong to petroleum equipment design and manufacturing technology field.
Background technique
The oil extraction in oil field industry is in mechanical oil recovery, oil well pump is key equipment wherein, oil well pump has Multiple Type and plurality of specifications at present, according to different oil well depths and different process requirement, adopt the oil well pump of different size, ground needs the pumping unit of different size to cooperate with it, the load of pumping unit suspension point mainly contains three kinds, the first load is the weight of sucker rod, the second load is the pressure power that the fluid column of oil pipe inside produces oil pump plunger piston, the third load is the various frictional force between sucker rod and the oil pipe, wherein the pressure power on the oil pump plunger piston is occupied significant proportion, the diameter of plunger is larger, and its occupied load proportion is just larger, and then the load of pumping unit is also just larger, therefore affect the depth of falling well of oil well pump, so it is darker that pump is hung, select the oil well pump footpath just less, the negative effect that brings thus is the hurried decline of the oil recovery amount of oil well.
Summary of the invention
The object of the present invention is to provide a kind of off-load type deep-well oil well pump, in the situation that do not change pump size, do not increase pumping unit load, make oil well pump can be deeply lower to the down-hole more than 300 meters with the assurance oil recovery amount.
To achieve these goals, Bian of the present invention gets following technological scheme and implements: a kind of off-load type deep-well oil well pump, comprise the pump housing and pump seat, and the described pump housing comprises valve, plunger system, traveling valve, standing valve, pump barrel system, it is characterized in that:
Going out valve is comprised of sliding tube delivery connection, fuel-displaced valve ball, delivery valve seat, sliding tube short circuit; There is a counterbore described sliding tube delivery connection upper end, be provided with the sucker rod internal thread in the counterbore, it is used for being connected with the sucker rod of oil well, upwards there is a deep hole lower end, the wall of deep hole upper end is provided with a plurality of equally distributed radial direction through hole, it is as the oil discharge passage of this pump, and there is an outwardly step at the middle part of deep hole, and the bottom of deep hole is provided with internal thread; Described fuel-displaced valve ball is the accurate smooth spheroid of outer surface; Described delivery valve seat is an annular solid, is provided with the conical surface of annular between upper end and the endoporus, and conical surface surface accurate is smooth, and it is positioned at the outwardly step in the deep hole middle part of sliding tube delivery connection and cooperates the one-way valve that formation seals with the outlet valve sphere; Described sliding tube short circuit is that the upper end is provided with the tubular body that the outside thread lower end is provided with internal thread, and the outside thread of upper end is connected with the internal thread of sliding tube delivery connection bottom;
Plunger system is comprised of box cupling, plunger under sliding tube, the sliding tube, and described sliding tube is the accurate smooth straight tube of outer surface, and its upper/lower terminal is equipped with outside thread, and upper external screw thread is connected with sliding tube short circuit lower end internal thread; Box cupling is a tubular body under the described sliding tube, and its upper end is provided with internal thread, the lower end is provided with outside thread, and the internal thread of upper end is connected with the outside thread of sliding tube lower end; Described plunger is the accurate smooth straight tube of outer surface, and its upper/lower terminal is equipped with internal thread, and the outside thread of box cupling lower end is connected under the internal thread of upper end and the sliding tube;
Traveling valve is comprised of plunger valve bonnet, plunger valve ball, plunger valve seat, plunger seeker, described plunger valve bonnet is the H sectional shape that two ends are equipped with counterbore, its top is provided with outside thread and is connected with the internal thread of plunger lower end, the joining portion of upper and lower two counterbores is provided with a plurality of and through hole its axis parallel, the middle part of lower end counterbore is provided with outwardly step, and the bottom of step is provided with internal thread; Described plunger valve ball is the accurate smooth spheroid of outer surface; Described plunger valve seat is an annular solid, is provided with the conical surface of annular between upper end and the endoporus, and conical surface surface accurate is smooth, and it is positioned at the outwardly step that counterbore middle part, plunger valve bonnet lower end is provided with, and cooperates with the plunger valve sphere, consists of the one-way valve of sealing; Described plunger seeker is the short tube structure, and its upper end is provided with outside thread and is connected with the internal thread of plunger valve bonnet bottom;
Standing valve is comprised of standing valve cover, fixed valve ball, fixed valve base, pump barrel seeker, and its structure and Placement are identical with plunger valve bonnet, plunger valve ball, plunger valve seat, plunger seeker in the traveling valve;
The pump barrel system protects box cupling, sliding sleeve, setting pipe, pump barrel to form by sliding tube, and described sliding tube protection box cupling is the tubular body of inverted U-shaped, and its underpart is provided with internal thread; Described sliding sleeve is the accurate smooth straight tube of bore area, and upper/lower terminal is equipped with outside thread, and the outer surface that its internal surface and sliding tube are accurate smooth forms motive sealing and cooperates, and the outside thread of upper end protects the internal thread of box cupling bottom to be connected with sliding tube; Described setting pipe is the tubular body that outer surface has a step, and the diameter on its top is greater than lower diameter, and the bottom is accurate smooth straight section, and the upper end is provided with internal thread, and the lower end is provided with outside thread,, the internal thread of upper end is connected with the outside thread of sliding sleeve lower end; Described pump barrel is the accurate smooth long tube body of internal surface, its upper/lower terminal is equipped with internal thread, have three radial direction through hole that are uniformly distributed in circumference on the wall on top, the outer surface that accurate smooth internal surface and plunger are accurate smooth forms motive sealing, the internal thread of upper end is connected with the internal and external threads of setting pipe lower end, and the internal thread of lower end is connected with the outside thread on standing valve cover top in the standing valve;
Pump seat is comprised of box cupling, pump seat sealed pipe in the middle of box cupling, O-ring seal, snap ring, the pump seat on the pump seat.Box cupling is tubular body on the described pump seat, and its upper end is provided with Internal Pipe Thread, is connected with the oil pipe of outside, and the lower end is provided with outside thread, and externally threaded top is provided with two can be for the groove of two seal rings embeddings; Described O-ring seal is O type circle; Box cupling is that the middle part is with the H shape of through hole in the middle of the described pump seat, the diameter of through hole is greater than setting pipe top external diameter in the pump barrel system, the counterbore bottom at two ends is equipped with internal thread, the outside of two ends counterbore is straight section, the outside thread of box cupling lower end is connected on the internal thread of upper bottom portion and the pump seat, consists of static seal between the straight section of upper outside and the O RunddichtringO; Described snap ring is one to have the Elastic Steel of annular opening, in outside expansionary force is arranged, diameter can become greatly, it is placed in the circular groove after connecting between the box cupling in the middle of the box cupling and pump seat on the pump seat; Described pump seat sealed pipe is that endoporus is through precision machined tubular body, its upper end is provided with outside thread, the lower end is provided with external pipe thread, upper external screw thread is connected with the internal thread of box cupling lower end in the middle of the pump seat, the external pipe thread of lower end is connected with the oil pipe of outside, the bottom of upper external screw thread is provided with two can for the groove of two seal rings embeddings, consist of static seal between the straight section by the lower outside section of box cupling in the middle of two seal rings and the pump seat.
Plunger system is positioned at the inside of pump barrel system, can move up and down; The pump barrel system is positioned at the outside of plunger system, and it is for maintaining static; Go out the top that valve is positioned at plunger system; Traveling valve is positioned at the bottom of plunger system; Standing valve is positioned at the bottom of traveling valve; Pump seat forms static seal and the through hole by box cupling middle part in the middle of the pump seat and snap ring by the accurate smooth straight section in the accurate internal surface of pump seat sealed pipe and the setting pipe bottom in the pump barrel system and snaps in the diameter section on setting pipe top setting.
The upper-end surface of plunger is by the radial direction through hole of pump barrel wall section and the exterior of pump barrel.
The diameter of load of the present invention and oil pump plunger piston is substantially irrelevant, only relevant with the cross-section area of slipper seal pipe, it is equivalent to the small-sized oil well pump that diameter is slipper seal pipe diameter same size, so the present invention have the load little, laborsaving, energy-conservation, can make the deeply lower hundreds of rice of oil well pump of same size, thereby solved the technical barrier that oil well is taken out deeply, can increase substantially oil production rate.
Description of drawings
Accompanying drawing 1 partly cuts open structural representation for the master of middle pump body of the present invention looks;
Accompanying drawing 2 is the main sectional structure schematic diagram of pump seat among the present invention.
In accompanying drawing 1: box cupling, 11 plungers, 12 plunger valve bonnets, 13 plunger valve balls, 14 plunger valve seats, 15 plunger seekers, 16 standing valve covers, 17 fixed valve balls, 18 fixed valve bases, 19 pump barrel seekers under 1 sliding tube delivery connection, 2 fuel-displaced valve balls, 3 delivery valve seats, 4 sliding tube pipe nipples, 5 sliding sleeves protection box cupling, 6 sliding sleeves, 7 sliding tubes, 8 setting pipes, 9 pump barrels, 10 sliding tubes.
In accompanying drawing 2: box cupling 24 pump seat sealed pipes in the middle of box cupling, 21 O-ring seals, 22 snap rings, 23 pump seats on 20 pump seats.
Embodiment
As shown in Figure 1, the pump housing is comprised of box cupling 10, plunger 11, plunger valve bonnet 12, plunger valve ball 13, plunger valve seat 14, plunger seeker 15, standing valve cover 16, fixed valve ball 17, fixed valve base 18, pump barrel seeker 19 etc. under slipper seal pipe delivery connection 1, fuel-displaced valve ball 2, delivery valve seat 3, sliding tube pipe nipple 4, sliding sleeve protection box cupling 5, sliding sleeve 6, sliding tube 7, setting pipe 8, pump barrel 9, the sliding tube.Sliding tube 7 is sliding sleeve 6 interior can pumping, sliding sleeve 6 lower ends adopt scyewed joint to be fixed on setting pipe 8 upper ends, the lower end of setting pipe 8 connects with pump barrel 9, pump barrel 9 upper ends have longitudinally elongated hole near near the tube wall the setting pipe 8, sliding tube 7 lower ends box cupling 10 under sliding tube links with plunger 11, so when sliding tube 7 pumped, plunger 11 pumped equally.When oil well pump is operated in up stroke, sliding tube 7 upper ends are by sliding tube delivery connection 1, fuel-displaced valve ball 2, delivery valve seat 3, the valve that goes out that sliding tube pipe nipple 4 forms cuts out, simultaneously by plunger valve bonnet 12, plunger valve ball 13, plunger valve seat 14, the traveling valve that plunger seeker 15 forms also cuts out, liquid in the plunger 11 top pump barrels 9 is expressed into outside the pump through pump barrel 9 top perforates, plunger 11 lower ends become negative pressure region, pump barrel 9 lower ends are by standing valve cover 16, fixed valve ball 17, fixed valve base 18, the standing valve that forms is opened, and the fluid in the oil well in time is full of space in the pump barrel of plunger 11 bottoms.When oil well pump is operated in down stroke, the valve that goes out of sliding tube 7 upper ends is opened, the traveling valve of plunger 11 lower ends is also opened simultaneously, the standing valve of pump barrel 9 lower ends cuts out, plunger 11 with and above under the sliding tube 7 and the sucker rod Action of Gravity Field in the oil well that are connected, fluid is expressed in the oil pipe of oil well pump top through plunger 11 and sliding tube 7 inside.Constantly repeat above-mentioned working procedure, can be with crude oil extraction from oil well.
As shown in Figure 2, pump seat is comprised of box cupling 23 and pump seat sealed pipe 24 in the middle of upper box cupling 20, O-ring seal 21, snap ring 22, the pump seat.Box cupling 20 adopts scyewed joint with the top of the middle box cupling 23 of pump seat on the pump seat, and by O-ring seal 21 sealings.Snap ring 22 is elasticity steel parts of an annular opening, and when there was outside expansionary force inside, its diameter can become greatly, and snap ring 22 is placed in the circular groove after connecting between the box cupling 23 in the middle of the box cupling 20 and pump seat on the pump seat.Box cupling 23 bottoms and pump seat sealed pipe 24 adopt scyewed joint in the middle of the pump seat, and by O-ring seal 21 sealings.
Pump seat sealed pipe 24 endoporus are precision machining, cooperate for accurate static seal with the setting pipe 8 in the accompanying drawing 1, the diameter on setting pipe 8 tops is greater than the diameter of its lower seal section, so the pump seat sealed pipe 24 of the pump housing can not be descending again after setting with setting pipe 8, and the position is relatively fixing.The internal diameter of snap ring 22 is less than the diameter on setting pipe 8 tops, and the restriction pump housing breaks away from pump seat sealed pipe 24, and the internal diameter that the power that makes progress when pump housing integral body makes snap ring 22 is during greater than the diameter on setting pipe 8 tops, and the pump housing just can be from whole extraction the out in the pump seat.
In oil well operation when construction,, the pump seat part is lowered into first in the oil well with oil pipe, and the pump housing is connected in sucker rod bottom, is lowered in the oil well with sucker rod, and when lower during to the bottom in the oil well, the pump housing dock with the sealing of pump seat nature, i.e. normal oil recovery production.
Energy-saving principle of the present invention be sliding tube 7 with sliding sleeve 6 between cooperate for slipper seal, divide isolation with upper part and the bottom of oil well pump, be divided into two pressure spans, top is divided into the zone of high pressure, the bottom is divided into the pressure variation zone, guarantee that the pressure power of partially liq on the pump does not directly act on the upper-end surface of plunger 11, the pressure power off-load of plunger 11 upper-end surfaces is fallen.The top of pump barrel 9 is with holes, and upper-end surface and the pump barrel 9 of plunger 11 is interlinked to the outside.When the pump work up stroke, sliding tube 7 upper ends unidirectional goes out valve and closes, the one-way valve of plunger 11 lower ends is also closed simultaneously, the standing valve of pump lower end is opened, the pressure difference value of the pressure of plunger 11 upper-end surfaces and plunger 11 lower end surfaces is quite little, therefore the upward stroke resistance of plunger 11 is very little, for the present invention generally speaking, the pressure power that its load bears for the cross-section area of sliding tube 7 substantially, it only accounts for the part of plunger 11 cross-section areas, therefore its load also only accounts for a part wherein, and load is also very little for pumping unit.When pump work during at down stroke, under the rod weight effect, sliding tube 7 and plunger 11 are descending, fixed valve ball is seated on the fixed valve base, and namely standing valve cuts out, and the valve that goes out of sliding tube 7 upper ends is opened, the one-way valve of plunger 11 lower ends is also opened simultaneously, liquid in the plunger 11 bottom pump barrels is gone out in the oil pipe to the pump through plunger 11 endoporus and sliding tube 7 endoporus agent, and so continuous operation is with the oil extraction.This working method, the pumping unit load on ground is very little, has realized the purpose that off-load is energy-conservation.
Claims (3)
1. an off-load type deep-well oil well pump comprises the pump housing and pump seat, and the described pump housing comprises valve, plunger system, traveling valve, standing valve, pump barrel system, describedly goes out valve and is comprised of sliding tube delivery connection, fuel-displaced valve ball, delivery valve seat, sliding tube short circuit; Described plunger system is comprised of box cupling, plunger under sliding tube, the sliding tube; Described traveling valve is comprised of plunger valve bonnet, plunger valve ball, plunger valve seat, plunger seeker; Described standing valve is comprised of standing valve cover, fixed valve ball, fixed valve base, pump barrel seeker; Described pump barrel system protects box cupling, sliding sleeve, setting pipe, pump barrel to form by sliding tube; Described pump seat is comprised of box cupling, pump seat sealed pipe in the middle of box cupling, O-ring seal, snap ring, the pump seat on the pump seat, and it is characterized in that: described plunger system is positioned at the inside of pump barrel system, can move up and down; Described pump barrel system is positioned at the outside of plunger system, and it is for maintaining static; Describedly go out the top that valve is positioned at plunger system; Described traveling valve is positioned at the bottom of plunger system; Described standing valve is positioned at the bottom of traveling valve; Described pump seat forms static seal and the through hole by box cupling middle part in the middle of the pump seat and snap ring by the accurate smooth straight section in the accurate internal surface of pump seat sealed pipe and the setting pipe bottom in the pump barrel system and snaps in the diameter section on setting pipe top setting.
2. a kind of energy-saving rod-type deep-well oil pump according to claim 1 is characterized in that
There is a counterbore described sliding tube delivery connection upper end, be provided with the sucker rod internal thread in the counterbore, it is used for being connected with the sucker rod of oil well, upwards there is a deep hole lower end, the wall of deep hole upper end is provided with a plurality of equally distributed radial direction through hole, it is as the oil discharge passage of this pump, and there is an outwardly step at the middle part of deep hole, and the bottom of deep hole is provided with internal thread; Described fuel-displaced valve ball is the accurate smooth spheroid of outer surface; Described delivery valve seat is an annular solid, is provided with the conical surface of annular between upper end and the endoporus, and conical surface surface accurate is smooth, and it is positioned at the outwardly step in the deep hole middle part of sliding tube delivery connection and cooperates the one-way valve that formation seals with the outlet valve sphere; Described sliding tube short circuit is that the upper end is provided with the tubular body that the outside thread lower end is provided with internal thread, and the outside thread of upper end is connected with the internal thread of sliding tube delivery connection bottom;
Described sliding tube is the accurate smooth straight tube of outer surface, and its upper/lower terminal is equipped with outside thread, and upper external screw thread is connected with sliding tube short circuit lower end internal thread; Box cupling is a tubular body under the described sliding tube, and its upper end is provided with internal thread, the lower end is provided with outside thread, and the internal thread of upper end is connected with the outside thread of sliding tube lower end; Described plunger is the accurate smooth straight tube of outer surface, and its upper/lower terminal is equipped with internal thread, and the outside thread of box cupling lower end is connected under the internal thread of upper end and the sliding tube;
Described plunger valve bonnet is the H sectional shape that two ends are equipped with counterbore, its top is provided with outside thread and is connected with the internal thread of plunger lower end, the joining portion of upper and lower two counterbores is provided with a plurality of and through hole its axis parallel, the middle part of lower end counterbore is provided with outwardly step, and the bottom of step is provided with internal thread; Described plunger valve ball is the accurate smooth spheroid of outer surface; Described plunger valve seat is an annular solid, is provided with the conical surface of annular between upper end and the endoporus, and conical surface surface accurate is smooth, and it is positioned at the outwardly step that counterbore middle part, plunger valve bonnet lower end is provided with, and cooperates with the plunger valve sphere, consists of the one-way valve of sealing; Described plunger seeker is the short tube structure, and its upper end is provided with outside thread and is connected with the internal thread of plunger valve bonnet bottom;
Standing valve cover in the described standing valve, fixed valve ball, fixed valve base, its structure of pump barrel seeker and Placement are identical with plunger valve bonnet, plunger valve ball, plunger valve seat, plunger seeker in the traveling valve;
Described sliding tube protection box cupling is the tubular body of inverted U-shaped, and its underpart is provided with internal thread; Described sliding sleeve is the accurate smooth straight tube of bore area, and upper/lower terminal is equipped with outside thread, and the outer surface that its internal surface and sliding tube are accurate smooth forms motive sealing and cooperates, and the outside thread of upper end protects the internal thread of box cupling bottom to be connected with sliding tube; Described setting pipe is the tubular body that outer surface has a step, and the diameter on its top is greater than lower diameter, and the bottom is accurate smooth straight section, and the upper end is provided with internal thread, and the lower end is provided with outside thread,, the internal thread of upper end is connected with the outside thread of sliding sleeve lower end; Described pump barrel is the accurate smooth long tube body of internal surface, its upper/lower terminal is equipped with internal thread, have three radial direction through hole that are uniformly distributed in circumference on the wall on top, the outer surface that accurate smooth internal surface and plunger are accurate smooth forms motive sealing, the internal thread of upper end is connected with the internal and external threads of setting pipe lower end, and the internal thread of lower end is connected with the outside thread on standing valve cover top in the standing valve;
Box cupling is tubular body on the described pump seat, and its upper end is provided with Internal Pipe Thread, is connected with the oil pipe of outside, and the lower end is provided with outside thread, and externally threaded top is provided with two can be for the groove of two seal rings embeddings; Described O-ring seal is O type circle; Box cupling is that the middle part is with the H shape of through hole in the middle of the described pump seat, the diameter of through hole is greater than setting pipe top external diameter in the pump barrel system, the counterbore bottom at two ends is equipped with internal thread, the outside of two ends counterbore is straight section, the outside thread of box cupling lower end is connected on the internal thread of upper bottom portion and the pump seat, consists of static seal between the straight section of upper outside and the O RunddichtringO; Described snap ring is one to have the Elastic Steel of annular opening, in outside expansionary force is arranged, diameter can become greatly, it is placed in the circular groove after connecting between the box cupling in the middle of the box cupling and pump seat on the pump seat; Described pump seat sealed pipe is that endoporus is through precision machined tubular body, its upper end is provided with outside thread, the lower end is provided with external pipe thread, upper external screw thread is connected with the internal thread of box cupling lower end in the middle of the pump seat, the external pipe thread of lower end is connected with the oil pipe of outside, the bottom of upper external screw thread is provided with two can for the groove of two seal rings embeddings, consist of static seal between the straight section by the lower outside section of box cupling in the middle of two seal rings and the pump seat.
3. a kind of energy-saving rod-type deep-well oil pump according to claim 1 is characterized in that the upper-end surface of plunger is by the radial direction through hole of pump barrel wall section and the exterior of pump barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210104463 CN103362796A (en) | 2012-04-11 | 2012-04-11 | Load-shedding oil well pump for deep well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210104463 CN103362796A (en) | 2012-04-11 | 2012-04-11 | Load-shedding oil well pump for deep well |
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| Publication Number | Publication Date |
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| CN103362796A true CN103362796A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210104463 Pending CN103362796A (en) | 2012-04-11 | 2012-04-11 | Load-shedding oil well pump for deep well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832491A (en) * | 2015-05-26 | 2015-08-12 | 张晓义 | Multistage hydraulic cylinder inside serial connection type drawing device |
| CN113944609A (en) * | 2020-07-15 | 2022-01-18 | 中国石油化工股份有限公司 | Hydraulic power-assisted deep-pumping pilot production system device |
-
2012
- 2012-04-11 CN CN 201210104463 patent/CN103362796A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832491A (en) * | 2015-05-26 | 2015-08-12 | 张晓义 | Multistage hydraulic cylinder inside serial connection type drawing device |
| CN113944609A (en) * | 2020-07-15 | 2022-01-18 | 中国石油化工股份有限公司 | Hydraulic power-assisted deep-pumping pilot production system device |
| CN113944609B (en) * | 2020-07-15 | 2023-03-21 | 中国石油化工股份有限公司 | Hydraulic power-assisted deep-pumping pilot production system device |
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Application publication date: 20131023 |