Hydraulic oil extraction system and using method thereof

Abstract

The invention discloses a hydraulic oil extraction system and a using method thereof, and the hydraulic oil extraction system comprises a shell, and further comprises a power fluid supercharging device, an underground power pump and an underground liquid extraction pump; the underground power pump is arranged in the shell, a penetrating power output shaft is arranged in the underground power pump, and a hollow channel is formed in the power output shaft; the underground liquid production pump is connected with the lower end of the shell, and the lower end of the power output shaft is connected with a plunger of the underground liquid production pump; the power fluid supercharging device is connected with the underground power pump and used for driving the underground power pump. According to the system, closed circulation is adopted for power liquid, the power liquid and output liquid are isolated from each other, the power liquid with the lubricating and anti-corrosion functions can be conveniently adopted to improve the working conditions of ground and underground devices, and the separation and metering problems caused after the output liquid and the power liquid are mixed are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil engineering, and specifically relates to a hydraulic oil production system and a method for using the same. Background Art

[0002] During the oil production process, due to factors such as large well deviation and high water cut in the produced fluid, eccentric wear and corrosion between the sucker rod and the tubing in the sucker rod lifting system cause the sucker rod to break and the tubing to perforate, resulting in a shortened production cycle of the oil well and frequent operations. By using the hydraulic drive method without a sucker rod, the eccentric wear between the tubing and the rod can be completely avoided. The purpose of the present invention is to provide a hydraulic oil production system.

[0003] The hydraulic oil production system has different scheme types, and the main difference lies in the power conversion mechanism and the downhole fluid passage scheme adopted. The whole set of system mainly includes parts such as power fluid boosting, power fluid transmission, power conversion, and fluid production mechanism. Among them, any fluid machinery with boosting ability such as a piston pump, a centrifugal pump, a screw pump, etc. can be used for the power fluid boosting part; the power conversion part can be simply classified into reciprocating type and axial flow type. The reciprocating power conversion mechanism is similar to a hydraulic cylinder with two reciprocating liquid chambers, and the axial flow power conversion mechanism such as a screw motor and a turbine; the fluid production mechanism can adopt a fluid machinery that can work in the downhole environment of the oil well and whose motion form matches the power conversion mechanism, such as a sucker rod pump, a screw pump, a centrifugal pump, a vane pump, etc.; the power fluid transmission part includes a power fluid reversing mechanism on the ground and downhole pipelines. When an axial flow type ground boosting part is used to support a reciprocating type downhole fluid production mechanism, a power fluid reversing mechanism needs to be equipped, which has different methods such as electromagnetic commutation, pure hydraulic commutation, or mechanical structure commutation. The downhole pipelines are generally divided into single pipe, double pipe, triple pipe, etc. according to whether the power fluid and the produced fluid are mixed and whether the annulus space between the casing and the tubing is utilized. The scheme adopting the axial flow power conversion mechanism requires a supporting rotating oil production device such as a screw pump, etc., and has high requirements for the operating speed and sealing components, and there is currently no good overall scheme.

[0004] Many configurations have been proposed for the scheme adopting the reciprocating power conversion mechanism, but there are some problems in the reliability of the power fluid transmission and commutation part and the operation of the fluid production pump.

[0005] Publication (Announcement) Number: CN115788360B discloses a downhole hydraulic control reversing valve and method for use in a hydraulic drive pump, including a valve body assembly: comprising a housing, within which an outer tube is provided, the outer tube is sleeved on the top end of an intermediate joint, the intermediate joint is sleeved on the bottom end of an upper cylinder, the top end of the upper cylinder is connected to an outer cylinder, the top ends of the outer cylinder and an inner cylinder are connected to a double-pass joint, and the double-pass joint is provided with an oil inlet hole; a valve core assembly: comprising an upper valve core and a lower valve core located at the bottom end of the upper valve core, the lower valve core is located within a lower cylinder provided at the bottom end of the intermediate joint; a plunger assembly: passing through the valve core assembly, including a first plunger portion located within the inner cylinder of the joint and a second plunger portion at its bottom end, the top of the internal space of the second plunger portion communicates with a third channel, and the second plunger portion is further provided with a liquid inlet hole. The hydraulic control reversing valve of this invention has high efficiency.

[0006] This prior art has the technical problems of a complex overall mechanism and inability to guarantee reliability.

[0007] Publication (Announcement) Number: CN110284857B discloses a hydraulic oil production device including a tubing string and a casing. The tubing string includes an oil production pump, and a hydraulic cylinder for driving the plunger of the oil production pump to move up and down is provided within the tubing string. The upper chamber of the hydraulic cylinder communicates with a hydraulic transmission channel through a power fluid connecting pipe. The hydraulic transmission channel is formed by the tubing string. A two-way diverter is provided below the hydraulic transmission channel. The two-way diverter is provided with a power fluid channel communicating the hydraulic transmission channel and the power fluid connecting pipe. The two-way diverter is further provided with a production fluid channel communicating the annulus between the tubing string and the casing and the tubing string. A packer is provided between the tubing string and the casing, and the packer is located below the outlet of the production fluid channel. This hydraulic oil production device uses the tubing string as the hydraulic transmission channel, eliminating the need to set up a dedicated hydraulic transmission channel, resulting in low cost investment and low cost, avoiding the problem of leakage of the hydraulic transmission channel. At the same time, this hydraulic oil production device has high pressure transmission efficiency.

[0008] This prior art has the problem of being unable to effectively and actively control the downward movement of the plunger of the oil extraction pump.

[0009] Publication (Announcement) Number: CN204961255U discloses a new type of anti-eccentric wear hydraulic oil production device, which includes an on-well power equipment and an under-well liquid production equipment. The on-well power equipment includes a power liquid storage tank, a piston pump, an accumulator and a reversing valve; the under-well liquid production equipment includes a power liquid pipeline, a power pump and a liquid production oil pipe. The lower part of the power liquid pipeline is connected to the power pump piston, the lower part of the liquid production oil pipe is connected to the pump barrel of the oil production pump, the inside of the pump barrel of the oil production pump is provided with a plunger of the oil production pump, a traveling valve is arranged inside the plunger of the oil production pump, the lower part of the pump barrel of the oil production pump is connected to an under-well oil pipe, and a fixed valve is arranged at the position where the under-well oil pipe is connected to the pump barrel of the oil production pump. A liquid production storage cavity is arranged between the plunger of the oil production pump and the fixed valve; the power pump cylinder and the plunger of the oil production pump are connected up and down through a weight rod; a liquid production outlet is arranged at the upper end of the liquid production oil pipe. The power liquid and the produced liquid are always isolated, eliminating the huge ground treatment equipment; and the reversing valve is arranged on the ground, the down-hole structure is simple and reliable, and the operation is convenient; at the same time, the problem of short down-hole service life is improved.

[0010] This prior art has the technical problem that the sucker rod pump relies on its own weight to descend and cannot effectively control the stroke frequency.

[0011] In short, the technical solutions, the technical problems to be solved and the beneficial effects generated by the above-disclosed technologies are all different from those of the present invention. For more technical features, technical problems to be solved and beneficial effects of the present invention, there is no technical inspiration in the above-disclosed technical documents. Summary of the Invention

[0012] Aiming at the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide a hydraulic oil production system and its use method, to solve the eccentric wear problem encountered by the rod pump lifting system, and at the same time solve the disadvantages existing in the existing hydraulic lifting schemes.

[0013] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0014] A hydraulic oil production system includes a housing, and also includes a power liquid booster device, an under-well power pump and an under-well liquid production pump; the under-well power pump is arranged inside the housing, a penetrating power output shaft is arranged inside the under-well power pump, and a hollow channel is arranged inside the power output shaft; the under-well liquid production pump is connected to the lower end of the housing, and the lower end of the power output shaft is connected to the plunger of the under-well liquid production pump; the power liquid booster device is connected to the under-well power pump and is used to drive the under-well power pump.

[0015] Further, the under-well power pump includes a first pump barrel, a power piston, a power output shaft and an inner partition barrel;

[0016] Specifically, the power piston is arranged in the first pump barrel, the inner partition barrel is arranged in the first pump barrel, and the lower end is located above the power piston;

[0017] Specifically, the upper end of the inner separation cylinder is connected to the upper end of the first pump cylinder through a first sealing ring member, and the lower end of the inner separation cylinder is connected to the inner wall of the first pump cylinder through a second sealing ring member;

[0018] Specifically, the lower end of the first pump cylinder is connected to the inner wall of the housing through a third sealing ring member, and the upper end of the housing is connected to the upper end of the housing through a fourth sealing ring member;

[0019] Specifically, the power output shaft passes through the lower end of the inner separation cylinder, the power piston, and the lower end of the first pump cylinder, and the power output shaft is fixedly connected to the power piston.

[0020] Further, the space between the first pump cylinder and the housing is the first power fluid channel, and the space between the inner separation cylinder and the first pump cylinder is the second power fluid channel;

[0021] Specifically, the space inside the inner separation cylinder is the production fluid channel;

[0022] Specifically, the space between the power piston and the second sealing ring member is the upper fluid chamber, and the space between the power piston and the bottom of the first pump cylinder is the lower fluid chamber.

[0023] Further, an upper production fluid port is provided at the upper end of the power output shaft to connect the hollow channel with the production fluid channel;

[0024] Specifically, a lower fluid inlet is provided at the lower end of the power output shaft to connect the hollow channel with the space below the third sealing ring member;

[0025] Specifically, the first sealing ring member is provided with a second liquid pipeline connection port, and the fourth sealing ring member is provided with a first liquid pipeline connection port;

[0026] Specifically, the second sealing ring member is provided with a second pressure transmission hole to connect the second power fluid channel with the upper fluid chamber;

[0027] Specifically, the lower end of the first pump cylinder is provided with a first pressure transmission hole to connect the first power fluid channel with the lower fluid chamber.

[0028] Further, the downhole liquid production pump includes a second pump cylinder and a plunger;

[0029] Specifically, the upper end of the second pump cylinder is connected to the lower end of the housing, a first check valve is provided at the lower end of the second pump cylinder, the plunger is arranged in the second pump cylinder, a second check valve is provided at the lower end of the plunger, a drain hole is provided at the upper end of the plunger, and the upper end of the plunger is connected to the lower end of the power output shaft.

[0030] In an embodiment of the present invention, the power fluid boosting device includes a hydraulic cylinder body, a driving piston, and a driving shaft;

[0031] Specifically, the driving piston is arranged in the hydraulic cylinder block, the driving shaft passes through the hydraulic cylinder block and the driving piston, and the driving shaft is fixedly connected with the driving piston;

[0032] Specifically, the driving piston divides the hydraulic cylinder block into a first power liquid boosting chamber and a second power liquid boosting chamber; the first power liquid boosting chamber is provided with a first hydraulic cylinder block connection port, and the second power liquid boosting chamber is provided with a second hydraulic cylinder block connection port.

[0033] Further, the first hydraulic cylinder block connection port and the first liquid pipeline connection port are communicated through a first power liquid pipeline, so that the first power liquid boosting chamber is communicated with the first power liquid channel;

[0034] Specifically, the second hydraulic cylinder block connection port and the second liquid pipeline connection port are communicated through a second power liquid pipeline, so that the second power liquid boosting chamber is communicated with the second power liquid channel.

[0035] In an embodiment of the present invention, the power liquid boosting device includes a crankshaft, a piston cylinder block, a first reciprocating piston, and a second reciprocating piston;

[0036] Specifically, a first compression cavity and a second compression cavity are arranged in the piston cylinder block, a first compression cavity connection port is arranged at the lower end of the first compression cavity, and a second compression cavity connection port is arranged at the lower end of the second compression cavity;

[0037] Specifically, the crankshaft is provided with two cranks, which are divided into a first crank and a second crank;

[0038] Specifically, the first reciprocating piston is arranged in the first compression cavity, and the second reciprocating piston is arranged in the second compression cavity;

[0039] Specifically, a first connecting rod is arranged at the upper end of the first reciprocating piston, a second connecting rod is arranged at the upper end of the second reciprocating piston, the first connecting rod is rotatably connected with the first crank, and the second connecting rod is rotatably connected with the second crank.

[0040] Further, the first compression cavity connection port and the first liquid pipeline connection port are communicated through a first power liquid pipeline, so that the first compression cavity is communicated with the first power liquid channel;

[0041] The second compression cavity connection port and the second liquid pipeline connection port are communicated through a second power liquid pipeline, so that the second compression cavity is communicated with the second power liquid channel.

[0042] A usage method of a hydraulic oil production system includes the following steps:

[0043] S1. Install the downhole power pump into the housing, connect the plunger of the downhole fluid production pump to the lower end of the power output shaft, connect the second pump barrel to the lower end of the housing, lower it into the well after assembly, connect the upper end of the inner partition barrel to the wellhead, connect the downhole power pump to the power fluid booster device, and start the power fluid booster device;

[0044] S2. During the downstroke, the power fluid is output into the second power fluid channel through the second power fluid pipeline, and finally enters the upper fluid chamber of the downhole power pump, pushing the power piston and the power output shaft to move towards the bottom of the well. The power fluid in the lower fluid chamber is displaced and flows back into the first power fluid pipeline through the first power fluid channel and finally enters the interior of the power fluid booster device;

[0045] At this time, the plunger of the downhole fluid production pump connected to the power output shaft is pushed downward, and the produced fluid in the pump barrel of the downhole fluid production pump enters the pump upper space through the inside of the plunger;

[0046] S3. During the upstroke, the power fluid is output into the first power fluid channel through the first power fluid pipeline, and finally enters the lower fluid chamber of the downhole power pump, pushing the power piston and the power output shaft to move towards the wellhead. The power fluid in the upper fluid chamber is displaced and flows back into the second power fluid pipeline through the second power fluid channel and finally enters the interior of the power fluid booster device;

[0047] At this time, the plunger of the downhole fluid production pump connected to the power output shaft is dragged upward, the downhole fluid production pump sucks in fluid, and the fluid above the pump is pushed by the plunger through the hollow channel and the produced fluid channel to reach the ground.

[0048] Specifically, the drive shaft in the power fluid booster device is driven by a prime mover that moves linearly back and forth, driving the sealing device to move back and forth. At this time, the first and second power fluid booster chambers will increase or decrease correspondingly, and when the first power fluid booster chamber increases, the second power fluid booster chamber will decrease simultaneously, and vice versa;

[0049] When the volume of the first power fluid booster chamber increases and the volume of the second power fluid booster chamber decreases, the power fluid in the second power fluid booster chamber is pressurized and flows along the second power fluid pipeline to the second power fluid channel, passes through the second pressure transmission holes of the second sealing ring member, reaches the upper fluid chamber of the downhole power pump, drives the power piston to make the power output shaft move downward, and further pushes the plunger of the fluid production pump downward to move to the bottom dead center. At this time, the first check valve closes and the second check valve opens, and the liquid enters the plunger and reaches above the plunger through the drain hole;

[0050] When the space of the first power fluid boosting cavity shrinks and the space of the second power fluid boosting cavity increases, the power fluid in the first power fluid boosting cavity flows into the first power fluid channel, passes through the first pressure transmission hole at the lower end of the first pump barrel, reaches the lower fluid cavity of the power pump, and drives the piston of the oil production pump to move upward. At this time, the first check valve opens and the second check valve closes, and the liquid enters the second pump barrel. The liquid above the plunger moves upward and reaches the produced liquid channel through the liquid inlet hole, the hollow channel, and the liquid production hole of the power output shaft.

[0051] Specifically, the crankshaft in the power fluid boosting device is connected to the prime mover with rotary motion. Driven by the prime mover with rotary motion, the crankshaft rotates, driving the first and second connecting rods to make reciprocating motions. Accordingly, the first and second reciprocating pistons move up and down along with the first and second connecting rods. And when the first connecting rod moves upward, the second connecting rod moves downward, and vice versa. Under the action of the first and second reciprocating pistons, the spaces of the first and second compression cavities expand or shrink correspondingly.

[0052] When the space of the first compression cavity increases and the space of the second compression cavity shrinks, the power fluid in the second compression cavity is boosted and flows along the second power fluid pipeline to the second power fluid channel, passes through the second pressure transmission hole of the second sealing ring part, reaches the upper fluid cavity of the downhole power pump, drives the power piston to make the power output shaft move downward, and further pushes the plunger of the fluid production pump downward to make it move to the lower dead point. At this time, the first check valve closes and the second check valve opens, and the liquid enters the plunger and reaches above the plunger through the liquid discharge hole.

[0053] When the space of the first compression cavity shrinks and the space of the second compression cavity increases, the power fluid in the first compression cavity flows into the first power fluid channel, passes through the first pressure transmission hole at the lower end of the first pump barrel, reaches the lower fluid cavity of the power pump, and drives the piston of the oil production pump to move upward. At this time, the first check valve opens and the second check valve closes, and the liquid enters the second pump barrel. The liquid above the plunger moves upward and reaches the produced liquid channel through the liquid inlet hole, the hollow channel, and the liquid production hole of the power output shaft.

[0054] The present invention has the following beneficial effects compared with the prior art:

[0055] 1. The power fluid of the system adopts a closed cycle, and the power fluid is isolated from the produced liquid. This not only facilitates the use of power fluid with lubricating and anti-corrosion functions to improve the working conditions of surface and downhole devices, but also avoids the separation and metering problems brought about by the mixing of the produced liquid and the power fluid.

[0056] 2. The reciprocating motions of the downhole moving mechanisms are all actively driven by the power fluid, which can better adapt to the working conditions of inclined wells and horizontal well sections and avoid the problem of slow downward movement of the fluid production pump existing in the single-stroke driving mode. Description of the Drawings

[0057] Figure 1It is a schematic structural diagram of the first embodiment of a hydraulic oil production system of the present invention;

[0058] Figure 2 It is a schematic structural diagram of the second embodiment of a hydraulic oil production system of the present invention;

[0059] In the figure: 1. Power fluid boosting device; 1a. First power fluid pipeline; 1b. Second power fluid pipeline; 1c. Driving piston; 2. First power fluid channel; 3. Second power fluid channel; 4. Produced fluid channel; 5. Downhole power pump; 6. Downhole fluid production pump;

[0060] 1d. Driving shaft; 1ea. First connecting rod; 1eb. Second connecting rod; 1fa. First reciprocating piston; 1fb. Second reciprocating piston; 1ga. First power fluid boosting chamber; 1gb. Second power fluid boosting chamber; 1h. Crankshaft; 1j a. First compression cavity; 1jb. Second compression cavity;

[0061] 5a. Power output shaft; 5b. Upper fluid chamber; 5c. Power piston; 5d. Lower fluid chamber; 5e. Hollow channel; 7a. First sealing ring member; 7b. Second sealing ring member; 7c. Third sealing ring member; 7d. Fourth sealing ring member. Specific embodiments

[0062] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0063] Embodiment 1:

[0064] Please refer to Figures 1 to 2 , a hydraulic oil production system provided by the present invention includes a housing and a power fluid boosting device 1; a downhole power pump 5 is arranged inside the housing, and a downhole fluid production pump 6 is connected below the housing; a through power output shaft 5a is arranged inside the downhole power pump 5, the lower end of the power output shaft 5a is connected to the plunger of the downhole fluid production pump 6, and a hollow channel 5e is arranged inside the power output shaft 5a; the power fluid boosting device 1 is connected to the downhole power pump 5 for driving the downhole power pump 5.

[0065] The downhole power pump 5 includes a first pump barrel, a power piston 5c, a power output shaft 5a, and an inner partition barrel; the power piston 5c is arranged in the first pump barrel, the inner partition barrel is arranged in the first pump barrel, and the lower end is located above the power piston 5c. The upper end of the inner partition barrel is connected to the upper end of the first pump barrel through a first sealing ring member 7a, the lower end of the inner partition barrel is connected to the inner wall of the first pump barrel through a second sealing ring member 7b, the lower end of the first pump barrel is connected to the inner wall of the housing through a third sealing ring member 7c, the upper end of the housing is connected to the upper end of the housing through a fourth sealing ring member 7d, and the power output shaft 5a passes through the lower end of the inner partition barrel, the power piston 5c, and the lower end of the first pump barrel. The power output shaft 5a is fixedly connected to the power piston 5c.

[0066] The space between the first pump barrel and the housing is the first power fluid channel 2, the space between the inner partition barrel and the first pump barrel is the second power fluid channel 3, the space inside the inner partition barrel is the produced fluid channel 4, the space between the power piston 5c and the second sealing ring member 7b is the upper fluid cavity 5b, and the space between the power piston 5c and the bottom of the first pump barrel is the lower fluid cavity 5d.

[0067] An upper produced fluid port is arranged at the upper end of the power output shaft 5a to communicate the hollow channel 5e with the produced fluid channel 4. A lower fluid inlet is arranged at the lower end of the power output shaft 5a to communicate the hollow channel 5e with the space below the third sealing ring member 7c. The first sealing ring member 7a is provided with a second liquid pipeline connection port, the fourth sealing ring member 7d is provided with a first liquid pipeline connection port, the second sealing ring member 7b is provided with a second pressure transmission hole to communicate the second power fluid channel 3 with the upper fluid cavity 5b, and the lower end of the first pump barrel is provided with a first pressure transmission hole to communicate the first power fluid channel 2 with the lower fluid cavity 5d.

[0068] The downhole fluid production pump 6 is a conventional fluid production pump, including a second pump barrel and a plunger. The upper end of the second pump barrel is connected to the lower end of the housing. A first check valve is arranged at the lower end of the second pump barrel. The plunger is arranged in the second pump barrel. A second check valve is arranged at the lower end of the plunger. A drain hole is arranged at the upper end of the plunger. The upper end of the plunger is connected to the lower end of the power output shaft 5a.

[0069] The power fluid boosting device 1 provided in this embodiment is as Figure 1 shown, and includes a hydraulic cylinder body, a driving piston 1c, and a driving shaft 1d; the driving piston 1c is arranged in the hydraulic cylinder body, the driving shaft 1d passes through the hydraulic cylinder body and the driving piston 1c, the driving shaft 1d is fixedly connected to the driving piston 1c, and the driving piston 1c divides the hydraulic cylinder body into a first power fluid boosting cavity 1ga and a second power fluid boosting cavity 1gb; the first power fluid boosting cavity 1ga is provided with a first hydraulic cylinder body connection port, and the second power fluid boosting cavity 1gb is provided with a second hydraulic cylinder body connection port.

[0070] The first hydraulic cylinder body connection port and the first liquid pipeline connection port are connected through a first power liquid pipeline 1a, so that the first power liquid pressurization chamber 1ga is connected to the first power liquid channel 2. The second hydraulic cylinder body connection port and the second liquid pipeline connection port are connected through a second power liquid pipeline 1b, so that the second power liquid pressurization chamber 1gb is connected to the second power liquid channel 3.

[0071] Driven by a prime mover performing linear reciprocating motion, the drive shaft 1d drives the sealing device 1c to reciprocate. At this time, the first and second power liquid pressurization chambers (1ga, 1gb) will increase or decrease accordingly. When the first power liquid pressurization chamber 1ga increases, the second power liquid pressurization chamber 1gb will decrease simultaneously, and vice versa.

[0072] When the space of the first power liquid pressurization chamber 1ga increases and the space of the second power liquid pressurization chamber 1gb decreases, the power liquid in the second power liquid pressurization chamber 1gb is pressurized and flows along the second power liquid pipeline 1b to the second power liquid channel 3, passes through the second pressure transmission hole of the second sealing ring member 7b, and reaches the upper liquid chamber 5b of the downhole power pump 5, driving the power piston 5c to make the power output shaft 5a move downward, and then pushing the plunger of the fluid production pump 6 downward to make it move to the bottom dead center. At this time, the first check valve closes and the second check valve opens, and the liquid enters the plunger and reaches above the plunger through the drain hole.

[0073] When the space of the first power liquid pressurization chamber 1ga decreases and the space of the second power liquid pressurization chamber 1gb increases, the power liquid in the first power liquid pressurization chamber 1ga flows to the first power liquid channel 2, passes through the first pressure transmission hole at the lower end of the first pump barrel, and reaches the lower liquid chamber 5d of the power pump 5, driving the piston of the oil production pump 6 to move upward. At this time, the first check valve opens and the second check valve closes, and the liquid enters the second pump barrel, and the liquid above the plunger moves upward and reaches the produced liquid channel 4 through the liquid inlet hole, the hollow channel 5e, and the liquid production hole of the power output shaft 5a.

[0074] The above process is continuously repeated, and the produced liquid in the well is continuously lifted to the ground.

[0075] Embodiment 2

[0076] Based on Embodiment 1, the power liquid pressurization device 1 of this embodiment is as Figure 2As shown, it includes a crankshaft 1h, a piston cylinder block, a first reciprocating piston 1fa, and a second reciprocating piston 1fb. A first compression cavity 1j a and a second compression cavity 1j b are arranged in the piston cylinder block. A first compression cavity connection port is arranged at the lower end of the first compression cavity 1j a, and a second compression cavity connection port is arranged at the lower end of the second compression cavity 1jb. The crankshaft 1h is provided with two cranks, namely a first crank and a second crank. The first reciprocating piston 1fa is arranged in the first compression cavity 1j a, and the second reciprocating piston 1fb is arranged in the second compression cavity 1j b. A first connecting rod 1ea is arranged at the upper end of the first reciprocating piston 1fa, and a second connecting rod 1eb is arranged at the upper end of the second reciprocating piston 1fb. The first connecting rod 1ea is rotationally connected to the first crank, and the second connecting rod 1eb is rotationally connected to the second crank.

[0077] The first compression cavity connection port and the first liquid pipeline connection port are connected through a first power liquid pipeline 1a, so that the first compression cavity 1j a is connected to the first power liquid channel 2. The second compression cavity connection port and the second liquid pipeline connection port are connected through a second power liquid pipeline 1b, so that the second compression cavity 1jb is connected to the second power liquid channel 3.

[0078] The crankshaft 1h is connected to a prime mover for rotary motion. Driven by a prime mover for rotary motion such as an electric motor, the crankshaft 1h rotates, driving the first and second connecting rods (1ea, 1eb) to perform reciprocating motions. Correspondingly, the first and second reciprocating pistons (1fa, 1fb) move up and down along with the first and second connecting rods (1ea, 1eb). And when the first connecting rod 1fa moves upward, the second connecting rod 1fb moves downward, and vice versa. Under the action of the first and second reciprocating pistons (1fa, 1fb), the spaces of the first and second compression cavities (1j a, 1jb) expand or contract accordingly.

[0079] When the space of the first compression cavity 1j a increases and the space of the second compression cavity 1jb decreases, the power liquid in the second compression cavity 1j b is pressurized and flows along the second power liquid pipeline 1b to the second power liquid channel 3, passes through the second pressure transmission hole of the second sealing ring 7b, and reaches the upper liquid cavity 5b of the downhole power pump 5, driving the power piston 5c to make the power output shaft 5a move downward, and further pushing the plunger of the fluid production pump 6 downward to make it move to the bottom dead center. At this time, the first check valve closes and the second check valve opens, and the liquid enters the plunger and reaches above the plunger through the drain hole.

[0080] When the space of the first compression cavity 1ja shrinks and the space of the second compression cavity 1jb increases, the power liquid in the first compression cavity 1ja flows into the first power liquid channel 2, passes through the first pressure transmission hole at the lower end of the first pump barrel, reaches the lower liquid cavity 5d of the power pump 5, and drives the piston of the oil production pump 6 to move upward. At this time, the first check valve opens and the second check valve closes. The liquid enters the second pump barrel, and the liquid above the plunger moves upward, passes through the liquid inlet hole, the hollow channel 5e, and the liquid production hole of the power output shaft 5a, and reaches the produced liquid channel 4.

[0081] The above process is continuously repeated in a cycle, and the produced liquid in the well is continuously lifted to the ground.

[0082] Embodiment 3:

[0083] Based on Embodiment 1 and Embodiment 2, this embodiment provides a usage method of the system, including the following steps:

[0084] S1. Install the downhole power pump 5 into the housing, connect the plunger of the downhole liquid production pump to the lower end of the power output shaft 5a, connect the second pump barrel to the lower end of the housing, lower it into the well after assembly, connect the upper end of the inner partition cylinder to the wellhead, then connect the downhole power pump 5 to the power liquid pressurizing device 1, and start the power liquid pressurizing device 1;

[0085] S2. During the downstroke, the power liquid is output from the second power liquid pipeline 1b to the second power liquid channel 3, and finally enters the upper liquid cavity 5b of the downhole power pump 5, pushing the power piston 5c and the power output shaft 5a to move towards the bottom of the well. The power liquid in the lower liquid cavity 5d is displaced and flows back into the first power liquid pipeline 1a through the first power liquid channel 2 and finally enters the interior of the power liquid pressurizing device 1. At this time, the plunger of the downhole liquid production pump 6 connected to the power output shaft 5a is pushed downward; the produced liquid in the pump barrel of the downhole liquid production pump 6 enters the space above the pump through the inside of the plunger;

[0086] S3. During the upstroke, the power liquid is output from the first power liquid pipeline 1a to the first power liquid channel 2, and finally enters the lower liquid cavity 5d of the downhole power pump 5, pushing the power piston 5c and the power output shaft 5a to move towards the wellhead. The power liquid in the upper liquid cavity 5b is displaced and flows back into the second power liquid pipeline 1b through the second power liquid channel 3 and finally enters the interior of the power liquid pressurizing device 1. At this time, the plunger of the downhole liquid production pump 6 connected to the power output shaft 5a is dragged upward, the downhole liquid production pump 6 pumps in liquid, and the liquid above the pump is pushed by the plunger through the hollow channel 5e and the produced liquid channel 4 to reach the ground;

[0087] S4. Steps S2 and S3 are continuously repeated in a cycle, and the produced liquid in the well is continuously lifted to the ground.

[0088] In this application, any components that are not elaborated on, as well as the connection methods of the various components in this application, belong to the well-known technologies in this technical field. They can be directly applied and will not be elaborated further.

[0089] In the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0091] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0092] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic oil production system, comprising a housing, characterized in that, It also includes a power fluid booster device, a downhole power pump, and a downhole fluid production pump; The downhole power pump is arranged inside the housing. A penetrating power output shaft is arranged inside the downhole power pump, and a hollow channel is arranged inside the power output shaft; The downhole fluid production pump is connected to the lower end of the housing, and the lower end of the power output shaft is connected to the plunger of the downhole fluid production pump; The power fluid booster device is connected to the downhole power pump and is used to drive the downhole power pump.

2. The hydraulic oil production system according to claim 1, characterized in that, The downhole power pump includes a first pump barrel, a power piston, a power output shaft, and an inner partition barrel; The power piston is arranged in the first pump barrel. The inner partition barrel is arranged in the first pump barrel and its lower end is located above the power piston; The upper end of the inner partition barrel is connected to the upper end of the first pump barrel through a first sealing ring member, and the lower end of the inner partition barrel is connected to the inner wall of the first pump barrel through a second sealing ring member; The lower end of the first pump barrel is connected to the inner wall of the housing through a third sealing ring member, and the upper end of the housing is connected to the upper end of the housing through a fourth sealing ring member; The power output shaft passes through the lower end of the inner partition barrel, the power piston, and the lower end of the first pump barrel, and the power output shaft is fixedly connected to the power piston.

3. The hydraulic oil production system according to claim 2, characterized in that, The space between the first pump barrel and the housing is the first power fluid channel, and the space between the inner partition barrel and the first pump barrel is the second power fluid channel; The space inside the inner partition barrel is the produced fluid channel; The space between the power piston and the second sealing ring member is the upper fluid chamber, and the space between the power piston and the bottom of the first pump barrel is the lower fluid chamber.

4. The hydraulic oil production system according to claim 3, characterized in that, An upper produced fluid port is arranged at the upper end of the power output shaft to connect the hollow channel with the produced fluid channel; A lower fluid inlet is arranged at the lower end of the power output shaft to connect the hollow channel with the space below the third sealing ring member; The first sealing ring member is provided with a second fluid pipeline connection port, and the fourth sealing ring member is provided with a first fluid pipeline connection port; The second sealing ring member is provided with a second pressure transmission hole to connect the second power fluid channel with the upper fluid chamber; The lower end of the first pump barrel is provided with a first pressure transmission hole to connect the first power fluid channel with the lower fluid chamber.

5. The hydraulic oil production system according to claim 4, characterized in that, The downhole fluid production pump includes a second pump barrel and a plunger; The upper end of the second pump barrel is connected to the lower end of the housing. A first check valve is arranged at the lower end of the second pump barrel. The plunger is arranged in the second pump barrel. A second check valve is arranged at the lower end of the plunger. A drain hole is arranged at the upper end of the plunger, and the upper end of the plunger is connected to the lower end of the power output shaft.

6. The hydraulic oil production system according to claim 4, characterized in that, The power fluid booster device includes a hydraulic cylinder body, a driving piston, and a driving shaft; The driving piston is arranged in the hydraulic cylinder body. The driving shaft passes through the hydraulic cylinder body and the driving piston, and the driving shaft is fixedly connected to the driving piston; The driving piston divides the hydraulic cylinder body into a first power fluid boosting chamber and a second power fluid boosting chamber. The first power fluid boosting chamber is provided with a first hydraulic cylinder body connection port, and the second power fluid boosting chamber is provided with a second hydraulic cylinder body connection port.

7. The hydraulic oil production system according to claim 6, characterized in that, The first hydraulic cylinder body connection port and the first fluid pipeline connection port are connected through a first power fluid pipeline to connect the first power fluid boosting chamber with the first power fluid channel; The second hydraulic cylinder body connection port and the second fluid pipeline connection port are connected through a second power fluid pipeline to connect the second power fluid boosting chamber with the second power fluid channel.

8. The hydraulic oil production system according to claim 4, characterized in that, The power fluid boosting device includes a crankshaft, a piston cylinder block, a first reciprocating piston, and a second reciprocating piston; A first compression cavity and a second compression cavity are arranged in the piston cylinder block. A first compression cavity connection port is arranged at the lower end of the first compression cavity, and a second compression cavity connection port is arranged at the lower end of the second compression cavity; The crankshaft is provided with two cranks, which are divided into a first crank and a second crank; The first reciprocating piston is arranged in the first compression cavity, and the second reciprocating piston is arranged in the second compression cavity; A first connecting rod is arranged at the upper end of the first reciprocating piston, and a second connecting rod is arranged at the upper end of the second reciprocating piston. The first connecting rod is rotatably connected to the first crank, and the second connecting rod is rotatably connected to the second crank.

9. The hydraulic oil production system according to claim 8, characterized in that,The first compression cavity connection port and the first liquid pipeline connection port are communicated through a first power fluid pipeline, so that the first compression cavity is communicated with the first power fluid channel; The second compression cavity connection port and the second liquid pipeline connection port are communicated through a second power fluid pipeline, so that the second compression cavity is communicated with the second power fluid channel.

10. A method for using a hydraulic oil production system, characterized in that, It includes the following steps: S1. Install the downhole power pump into the housing, connect the plunger of the downhole liquid production pump to the lower end of the power output shaft, connect the second pump barrel to the lower end of the housing, lower it into the well after assembly, connect the upper end of the inner separation barrel to the wellhead, connect the downhole power pump to the power fluid boosting device, and start the power fluid boosting device; S2. During the downstroke, the power fluid is output into the second power fluid channel through the second power fluid pipeline, and finally enters the upper liquid cavity of the downhole power pump, pushing the power piston and the power output shaft to move towards the bottom of the well. The power fluid in the lower liquid cavity is displaced and flows back into the first power fluid pipeline through the first power fluid channel and finally enters the interior of the power fluid boosting device; At this time, the plunger of the downhole liquid production pump connected to the power output shaft is pushed downward, and the produced liquid in the pump barrel of the downhole liquid production pump enters the pump upper space through the inside of the plunger; S3. During the upstroke, the power fluid is output into the first power fluid channel through the first power fluid pipeline, and finally enters the lower liquid cavity of the downhole power pump, pushing the power piston and the power output shaft to move towards the wellhead. The power fluid in the upper liquid cavity is displaced and flows back into the second power fluid pipeline through the second power fluid channel and finally enters the interior of the power fluid boosting device; At this time, the plunger of the downhole liquid production pump connected to the power output shaft is dragged upward, the downhole liquid production pump is filled with liquid, and the liquid above the pump reaches the ground under the push of the plunger through the hollow channel and the produced liquid channel.

11. The method for using a hydraulic oil production system according to claim 10, characterized in that, The drive shaft in the power fluid boosting device is driven by a prime mover that moves linearly back and forth, driving the sealing device to move back and forth. At this time, the first and second power fluid boosting cavities will increase or decrease accordingly, and when the first power fluid boosting cavity increases, the second power fluid boosting cavity will decrease simultaneously, and vice versa; When the space of the first power fluid boosting chamber increases and the space of the second power fluid boosting chamber decreases, the power fluid in the second power fluid boosting chamber is boosted and flows along the second power fluid pipeline to the second power fluid channel, passes through the second pressure transmission hole of the second sealing ring part, reaches the upper liquid chamber of the downhole power pump, drives the power piston to make the power output shaft move downward, and further pushes the plunger of the fluid production pump downward to make it move to the bottom dead center. At this time, the first check valve closes and the second check valve opens, and the liquid enters the plunger and reaches above the plunger through the drain hole; When the space of the first power fluid boosting chamber decreases and the space of the second power fluid boosting chamber increases, the power fluid in the first power fluid boosting chamber flows to the first power fluid channel, passes through the first pressure transmission hole at the lower end of the first pump barrel, reaches the lower liquid chamber of the power pump, drives the piston of the oil production pump to move upward. At this time, the first check valve opens and the second check valve closes, and the liquid enters the second pump barrel, and the liquid above the plunger moves upward and reaches the produced liquid channel through the liquid inlet hole, the hollow channel and the liquid production hole of the power output shaft.

12. The method for using a hydraulic oil production system according to claim 10, characterized in that, The crankshaft in the power fluid boosting device is connected to the prime mover with rotational motion. Driven by the prime mover with rotational motion, the crankshaft rotates, drives the first and second connecting rods to make reciprocating motions, and the corresponding first and second reciprocating pistons move up and down along with the first and second connecting rods. And when the first connecting rod moves upward, the second connecting rod moves downward, and vice versa. Under the action of the first and second reciprocating pistons, the spaces of the first and second compression cavities expand or contract correspondingly; When the space of the first compression cavity increases and the space of the second compression cavity decreases, the power fluid in the second compression cavity is boosted and flows along the second power fluid pipeline to the second power fluid channel, passes through the second pressure transmission hole of the second sealing ring part, reaches the upper liquid chamber of the downhole power pump, drives the power piston to make the power output shaft move downward, and further pushes the plunger of the fluid production pump downward to make it move to the bottom dead center. At this time, the first check valve closes and the second check valve opens, and the liquid enters the plunger and reaches above the plunger through the drain hole; When the space of the first compression cavity decreases and the space of the second compression cavity increases, the power fluid in the first compression cavity flows to the first power fluid channel, passes through the first pressure transmission hole at the lower end of the first pump barrel, reaches the lower liquid chamber of the power pump, drives the piston of the oil production pump to move upward. At this time, the first check valve opens and the second check valve closes, and the liquid enters the second pump barrel, and the liquid above the plunger moves upward and reaches the produced liquid channel through the liquid inlet hole, the hollow channel and the liquid production hole of the power output shaft.

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