A concentric double-tube well completion integrated production device and process

Abstract

The present invention belongs to the technical field of oil and gas production, and specifically relates to a concentric double-tube well completion integrated production device and process, including: a working cylinder and a hydraulic pump, the working cylinder includes an inner pump cylinder and an outer pump cylinder, the inner pump cylinder and the outer pump cylinder are both hollow cylinders with openings at both ends, the inner pump cylinder is fixedly connected to the inner wall of the outer pump cylinder, and the hydraulic pump is installed in the inner pump cylinder. The present invention uses a set of lifting tools before and after production, avoiding well repair operations by replacing the lifting process; the lifting advantages of the hydraulic jet pump with large liquid volume and strong sand carrying and discharge capacity are used in the early stage, and the hydraulic piston pump is used in the later stage to reduce energy consumption; at the same time, the ground processes and equipment of the two lifting processes are compatible, which reduces the investment in equipment and process transformation and reduces production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas production, and in particular relates to a concentric double-tube well completion integrated production device and process. Background Art

[0002] In the process of developing oil and gas fields (including coalbed methane), some oil and gas wells use hydraulic piston pumps and hydraulic jet pump lifting technologies to lift oil and water in the oil and gas reservoirs from the bottom of the well to the ground to achieve the purpose of oil well production and gas well production.

[0003] Among them, the main advantages of hydraulic piston pumps are as follows: 1. The downhole pump has high pump efficiency, with a total efficiency of 40%-60%; 2. The downhole pump can be raised and lowered by hydraulic force, and the pump can be inspected and replaced without the need for an operating machine, saving operating costs; 3. The overall operating energy consumption is low. The main disadvantages are as follows: 1. Low liquid production; 2. Severe sand and coal powder in the formation can easily cause the reversing mechanism to become stuck and worn and unable to work normally.

[0004] The main advantages of hydraulic jet pumps are as follows: 1. Downhole pumps can be raised and lowered by hydraulic force, and pump inspection and replacement do not require an operating machine, saving costs; 2. Large liquid production; 3. Downhole pumps have no relatively moving parts and have a certain sand carrying and discharge capacity, which is suitable for serious conditions of formation sand and coal powder. Its main disadvantages are as follows: 1. Downhole pump efficiency is low, with a total efficiency of ≤25%; 2. The overall operating energy consumption is high.

[0005] In the process of oil and gas field development, especially coalbed methane wells, there is a situation in which the formation produces a large amount of liquid in the early stage of production, and the amount of sand and coal powder in the liquid is large; in the late stage of production, the formation produces 5-10 cubic meters of liquid per day, and the amount of sand and coal powder in the liquid is very small. Usually, the hydraulic jet pump lifting process is used in the early stage, and the hydraulic piston pump, pumping unit or other lifting processes are replaced in the later stage. To replace the lifting process during the production process, two types of downhole tools need to be matched, and the surface equipment and processes also need to be replaced or adjusted accordingly. At the same time, well repair operations are required, which increases production costs, reduces production timeliness, and reduces profits.

[0006] Therefore, it is necessary to study a downhole pump that can realize the application of a jet pump and a piston pump in the same pump barrel, and both downhole pumps have a hydraulic lifting function. In the early stage when the liquid production is large and the sand or coal powder is high, the jet pump downhole pump is used to carry out large liquid to carry out sand or coal powder production; in the later stage when the liquid production is reduced and the sand or coal powder is small, the jet pump downhole pump is hydraulically lifted out, and the piston pump downhole pump is used to reduce energy consumption and produce a concentric double-pipe completion integrated mining device and process. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention provides a concentric double-tube well completion integrated production device and process.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A concentric double-tube well completion integrated mining device and process, comprising: a working cylinder and a hydraulic pump;

[0010] The working cylinder comprises an inner pump cylinder and an outer pump cylinder, both of which are hollow cylinders with openings at both ends, and the inner pump cylinder is fixedly connected to the inner wall of the outer pump cylinder;

[0011] The inner pump barrel is provided with: an a1 sealing part, a first channel, a first hole, an a2 sealing part, a first cavity, an a3 sealing part, a second cavity, a second hole, an a4 sealing part, a third cavity, an a5 sealing part, a fourth cavity, and a third hole. The first cavity, the second cavity, the third cavity, and the fourth cavity are sequentially arranged in the inner pump barrel from top to bottom. The a1 sealing part is arranged on the inner wall of the top of the inner pump barrel, the first hole is arranged above the first cavity, the a2 sealing part is arranged on both sides of the first hole, the a3 sealing part is arranged between the first cavity and the second cavity, the second hole is arranged on the inner wall of the second cavity, the a4 sealing part is arranged between the second cavity and the third cavity, the a5 sealing part is arranged between the third cavity and the fourth cavity, the third hole is arranged on the side wall of the fourth cavity, the third hole is communicated with the second channel, and the first channel is connected with the first cavity;

[0012] The outer pump barrel is provided with: a second connection part, an a6 sealing part, an a7 sealing part, a fifth cavity, a traveling valve, and a second passage. The second connection part is provided at the upper end opening of the outer pump barrel, the second connection part is connected to the large oil pipe, the fifth cavity is provided near the lower end opening of the outer pump barrel, the traveling valve is provided in the fifth cavity, the a6 sealing part and the a7 sealing part are provided above the fifth cavity in sequence from top to bottom, and a second passage is formed between the inner pump barrel and the outer pump barrel;

[0013] The hydraulic pump is installed in the inner pump barrel.

[0014] Furthermore, the working cylinder also includes a sealing plug, which is a hollow cylinder with openings at both ends. A first connecting portion is provided at the opening at the upper end of the sealing plug, and the first connecting portion is connected to the small oil pipe. The sealing plug cooperates with the a1 sealing portion.

[0015] Furthermore, the hydraulic pump is a hydraulic jet pump.

[0016] Furthermore, the hydraulic jet pump includes: a first salvaging head, a first lifting leather cup, a first power liquid inlet, a nozzle, a throat, a first liquid outlet, a second liquid outlet, and a first liquid inlet. The first power liquid inlet is arranged above the hydraulic jet pump, the nozzle and the throat are arranged between the first power liquid inlet and the first liquid inlet, the first liquid outlet and the second liquid outlet are arranged between the throat and the first liquid inlet, the first liquid outlet is connected to the throat, the second liquid outlet is connected to the first liquid inlet, the first salvaging head is fixedly arranged on the top of the hydraulic jet pump, and the first lifting leather cup is arranged below the first power liquid inlet.

[0017] Furthermore, the hydraulic jet pump also includes: b1 sealing part, b2 sealing part, b3 sealing part, b4 sealing part, b5 sealing part, and b6 sealing part, and the b1 sealing part, b2 sealing part, b3 sealing part, b4 sealing part, b5 sealing part, and b6 sealing part are arranged on the outer wall of the hydraulic jet pump, and the b1 sealing part and b2 sealing part cooperate with the a2 sealing part, the b3 sealing part and b4 sealing part cooperate with the a3 sealing part and a4 sealing part respectively, the b5 sealing part cooperates with the a5 sealing part, and the b6 sealing part cooperates with the a6 sealing part.

[0018] Furthermore, the hydraulic pump is a hydraulic piston pump.

[0019] Furthermore, the hydraulic piston pump includes: a second salvaging head, a second lifting leather cup, a second power liquid inlet hole, a fourth hole, a reversing mechanism, a piston mechanism, a liquid inlet valve, a second inlet, a liquid discharge valve, a third liquid outlet, a fourth liquid outlet, and a third liquid inlet. The second power liquid inlet hole is arranged above the hydraulic piston pump, the fourth hole is arranged on the hydraulic piston pump, the piston mechanism is arranged below the fourth hole and connected to the fourth hole, the second inlet and the third liquid outlet are arranged below the piston mechanism and connected to the piston mechanism, the second inlet is provided with a liquid inlet valve, the third liquid outlet is provided with a liquid discharge valve, the fourth liquid outlet is connected to the third liquid inlet, and the fourth liquid outlet is arranged below the piston mechanism. The second salvaging head is fixedly arranged at the top of the hydraulic piston pump, and the second lifting leather cup is arranged below the second power liquid inlet hole.

[0020] Furthermore, the piston mechanism includes: a first piston chamber, a second piston chamber, a driving piston, a connecting rod, and a pump-end piston. The upper end of the first piston chamber is connected to the fourth hole, and the lower end of the second piston chamber is connected to the second inlet and the third outlet. The driving piston is slidably set in the first piston chamber, and the pump-end piston is slidably set in the second piston chamber. The driving piston and the pump-end piston are connected by a connecting rod.

[0021] Furthermore, the hydraulic piston pump also includes: c1 sealing part, c2 sealing part, c3 sealing part, c4 sealing part, c5 sealing part, c6 sealing part, the c1 sealing part, c2 sealing part, c3 sealing part, c4 sealing part, c5 sealing part, c6 sealing part are arranged on the outer wall of the hydraulic piston pump, the c1 sealing part and c2 sealing part cooperate with the a2 sealing part, the c3 sealing part and c4 sealing part cooperate with the a3 sealing part and the a4 sealing part respectively, the c5 sealing part cooperates with the a5 sealing part, the c6 sealing part cooperates with the a7 sealing part, the reversing mechanism includes a power fluid inlet and a power-deficient fluid outlet, the reversing mechanism is sleeved on the connecting rod between the driving piston and the pump end piston, and the reversing mechanism is slidably matched with the connecting rod.

[0022] An oil and gas production process comprises the following steps:

[0023] S1. Equipment installation: fix the small oil pipe to the first connection part of the sealing plug, and fix the large oil pipe to the first connection part of the working cylinder;

[0024] S2. Initial preparation: drop the hydraulic jet pump from the small oil pipe, and use the power fluid to push the hydraulic jet pump into the working cylinder until the b6 sealing part cooperates with the a6 sealing part.

[0025] S3. In the early stage of production, the power fluid enters from the small oil pipe and forms a mixed liquid in the hydraulic jet pump. The mixed liquid returns to the ground along the annulus of the large oil pipe and the small oil pipe;

[0026] S4, final preparation, hydraulically pull out the hydraulic jet pump, drop the hydraulic piston pump from the small oil pipe, and use the power fluid to push the hydraulic piston pump into the working cylinder until the c6 sealing part cooperates with the a7 sealing part;

[0027] S5. At the end of production, power fluid enters from the small oil pipe, drives the hydraulic piston pump (3) to work, sucks and discharges the formation fluid, and returns to the surface along the annulus of the large oil pipe and the small oil pipe.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention discloses a concentric double-tube well completion integrated mining device and process. A set of lifting tools is used before and after production, thereby avoiding well repair operations performed by replacing the lifting process. The lifting advantages of the hydraulic jet pump with large liquid volume and strong sand carrying and discharge capacity are utilized in the early stage, and the hydraulic piston pump is utilized in the later stage to reduce energy consumption. At the same time, the ground processes and equipment of the two lifting processes are compatible, thereby reducing the investment in equipment and process transformation and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the working cylinder;

[0031] Figure 2 It is a structural schematic diagram of a hydraulic jet pump;

[0032] Figure 3 This is a schematic diagram of the production status of a hydraulic jet pump;

[0033] Figure 4 It is a structural schematic diagram of a hydraulic piston pump;

[0034] Figure 5 It is a schematic diagram of the liquid suction stroke of the hydraulic piston pump;

[0035] Figure 6 Schematic diagram of the hydraulic piston pump discharge stroke.

[0036] The reference numerals involved in the accompanying drawings are:

[0037] 1. Working cylinder; 11. Inner pump cylinder; 111. a1 sealing part; 112. First channel; 113. First hole; 114. a2 sealing part; 115. First cavity; 116. a3 sealing part; 117. Second cavity; 118. Second hole; 119. a4 sealing part; 1110. Third cavity; 1111. a5 sealing part; 1112. Fourth cavity; 1113. Third hole; 12. Sealing plug; 121 , first connection part; 13, outer pump barrel; 131, second connection part; 132, a6 sealing part; 133, a7 sealing part; 134, fifth cavity; 135, floating valve; 136, second channel; 2, hydraulic jet pump; 21, first fishing head; 22, first power inlet hole; 23, first lifting leather cup; 24, b1 sealing part; 25, b2 sealing part; 26, b3 sealing part; 27, b4 sealing part; 28, Nozzle; 29, throat; 210, first liquid outlet; 211, second liquid outlet; 212, b5 sealing part; 213, b6 sealing part; 214, first liquid inlet; 3, hydraulic piston pump; 31, second fishing head; 32, second power liquid inlet hole; 33, second lifting leather cup; 34, c1 sealing part; 35, fourth hole; 36, c2 sealing part; 371, first piston chamber; 372, second piston chamber; 373, drive Moving piston; 374, connecting rod; 375, power fluid inlet; 376, power fluid outlet; 377, pump end piston; 38, c3 sealing part; 39, c4 sealing part; 310, liquid inlet valve; 311, second inlet; 316, liquid discharge valve; 312, third liquid outlet; 317, fourth liquid outlet; 313, c5 sealing part; 314, c6 sealing part; 315, third liquid inlet; 41, large oil pipe; 42, small oil pipe. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0039] In the description of this application, it should be noted that for directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back",

[0040] The directions and positional relationships indicated by “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as limiting the specific scope of protection of the present application.

[0041] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0042] Embodiment 1

[0043] See also Figures 1 to 6 As shown, a concentric double-tube well completion integrated production device and process includes: a working cylinder 1 and a hydraulic pump.

[0044] The working cylinder 1 comprises an inner pump cylinder 11 and an outer pump cylinder 13 . Both the inner pump cylinder 11 and the outer pump cylinder 13 are hollow cylinders with openings at both ends. The inner pump cylinder 11 is fixedly connected to the inner wall of the outer pump cylinder 13 .

[0045] The inner pump barrel 11 is provided with: an a1 sealing portion 111, a first channel 112, a first hole 113, an a2 sealing portion 114, a first cavity 115, an a3 sealing portion 116, a second cavity 117, a second hole 118, an a4 sealing portion 119, a third cavity 1110, an a5 sealing portion 1111, a fourth cavity 1112, and a third hole 1113. The first cavity 115, the second cavity 117, the third cavity 1110, and the fourth cavity 1112 are sequentially arranged in the inner pump barrel 11 from top to bottom. The a1 sealing portion 111 is arranged on the inner wall at the top of the inner pump barrel 11. The first hole 113 is arranged in the first cavity 115, the a2 sealing portion 114 is arranged on both sides of the first hole 113, the a3 sealing portion 116 is arranged between the first cavity 115 and the second cavity 117, the second hole 118 is arranged on the inner wall of the second cavity 117, the a4 sealing portion 119 is arranged between the second cavity 117 and the third cavity 1110, the a5 sealing portion 1111 is arranged between the third cavity 1110 and the fourth cavity 1112, the third hole 1113 is arranged on the side wall of the fourth cavity 1112, the third hole 1113 is connected to the second channel 136, and the first channel 112 is connected to the first cavity 115.

[0046] Specifically, the working cylinder 1 also includes a sealing plug 12, which is a hollow cylinder with openings at both ends. A first connecting portion 121 is provided at the upper opening of the sealing plug 12, and the first connecting portion 121 is connected to the small oil pipe 42. The sealing plug 12 cooperates with the a1 sealing portion 111.

[0047] The outer pump barrel 13 is provided with: a second connecting portion 131, an a6 sealing portion 132, an a7 sealing portion 133, a fifth cavity 134, a floating valve 135, and a second channel 136. The second connecting portion 131 is arranged at the upper end opening of the outer pump barrel 13, the second connecting portion 131 is connected to the large oil pipe 41, the fifth cavity 134 is arranged near the lower end opening of the outer pump barrel 13, the floating valve 135 is arranged in the fifth cavity 134, the a6 sealing portion 132 and the a7 sealing portion 133 are arranged in sequence from top to bottom above the fifth cavity 134, and a second channel 136 is formed between the inner pump barrel 11 and the outer pump barrel 13.

[0048] The hydraulic pump is installed in the inner pump barrel 11 . Specifically, the hydraulic pump is a hydraulic jet pump 2 .

[0049] The hydraulic jet pump 2 includes: a first fishing head 21, a first lifting leather cup 23, a first power liquid inlet hole 22, a nozzle 28, a throat 29, a first liquid outlet 210, a second liquid outlet 211, and a first liquid inlet 214. The first power liquid inlet hole 22 is arranged above the hydraulic jet pump 2, the nozzle 28 and the throat 29 are arranged between the first power liquid inlet hole 22 and the first liquid inlet 214, the first liquid outlet 210 and the second liquid outlet 211 are arranged between the throat 29 and the first liquid inlet 214, the first liquid outlet 210 is communicated with the throat 29, and the second liquid outlet 211 is communicated with the first liquid inlet 214. The first fishing head 21 is fixedly arranged on the top of the hydraulic jet pump 2, and the first lifting leather cup 23 is arranged below the first power liquid inlet hole 22. Specifically, the hydraulic jet pump 2 also includes: a b1 sealing part 24, a b2 sealing part 25, a b3 sealing part 26, a b4 sealing part 27, a b5 sealing part 212, and a b6 sealing part 213. The b1 sealing part 24, the b2 sealing part 25, the b3 sealing part 26, the b4 sealing part 27, the b5 sealing part 212, and the b6 sealing part 213 are arranged on the outer wall of the hydraulic jet pump 2, the b1 sealing part 24 and the b2 sealing part 25 cooperate with the a2 sealing part 114, the b3 sealing part 26 and the b4 sealing part 27 cooperate with the a3 sealing part 116 and the a4 sealing part 119 respectively, the b5 sealing part 212 cooperates with the a5 sealing part 1111, and the b6 sealing part 213 cooperates with the a6 sealing part 132.

[0050] Embodiment 2

[0051] See also Figures 1 to 6 As shown, the difference between this embodiment and the first embodiment is that the hydraulic pump is a hydraulic piston pump 3.

[0052] The hydraulic piston pump 3 includes: a second fishing head 31, a second lifting leather cup 33, a second power liquid inlet hole 32, a fourth hole 35, a reversing mechanism, a piston mechanism, a liquid inlet valve 310, a second inlet 311, a liquid discharge valve 316, a third liquid outlet 312, a fourth liquid outlet 317, and a third liquid inlet 315. The second power liquid inlet hole 32 is arranged above the hydraulic piston pump 3, the fourth hole 35 is arranged on the hydraulic piston pump 3, and the piston mechanism is arranged below the fourth hole 35 and connected to the fourth hole 35. The second inlet 311 and the third liquid outlet 312 are arranged below the piston mechanism and connected to the piston mechanism. The second inlet 311 is provided with a liquid inlet valve 310, and the third liquid outlet 312 is provided with a liquid discharge valve 316. The fourth liquid outlet 317 is connected to the third liquid inlet 315, and the fourth liquid outlet 317 is arranged below the piston mechanism. The second fishing head 31 is fixedly arranged at the top of the hydraulic piston pump 3, and the second lifting leather cup 33 is arranged below the second power liquid inlet hole 32. Specifically, the hydraulic piston pump 3 also includes: a c1 sealing part 34, a c2 sealing part 36, a c3 sealing part 38, a c4 sealing part 39, a c5 sealing part 313, and a c6 sealing part 314. The c1 sealing part 34, the c2 sealing part 36, the c3 sealing part 38, the c4 sealing part 39, the c5 sealing part 313, and the c6 sealing part 314 are arranged on the outer wall of the hydraulic piston pump 3, the c1 sealing part 34 and the c2 sealing part 36 cooperate with the a2 sealing part 114, the c3 sealing part 38 and the c4 sealing part 39 cooperate with the a3 sealing part 116 and the a4 sealing part 119 respectively, the c5 sealing part 313 cooperates with the a5 sealing part 1111, and the c6 sealing part 314 cooperates with the a7 sealing part 133.

[0053] Specifically, the piston mechanism includes: a first piston chamber 371, a second piston chamber 372, a driving piston 373, a connecting rod 374, and a pump-end piston 377. The upper end of the first piston chamber 371 is connected to the fourth hole 35, and the lower end of the second piston chamber 372 is connected to the second inlet 311 and the third liquid outlet 312. The driving piston 373 is slidably disposed in the first piston chamber 371, and the pump-end piston 377 is slidably disposed in the second piston chamber 372. The driving piston 373 and the pump-end piston 377 are connected through a connecting rod 374. The reversing mechanism includes a power liquid inlet 375 and a power-deficient liquid outlet 376. The reversing mechanism is sleeved on the connecting rod between the driving piston and the pump-end piston, and the reversing mechanism and the connecting rod are slidably matched.

[0054] Embodiment 3

[0055] See also Figures 1 to 6The oil and gas production process shown is carried out according to the concentric double-tube well completion integrated production device described in the first and second embodiments, and includes the following steps:

[0056] S1. Equipment installation: fix the small oil pipe 42 to the first connecting portion 121 of the sealing plug 12, and fix the large oil pipe 41 to the first connecting portion 121 of the working cylinder 1.

[0057] S2, initial preparation, lower the hydraulic jet pump 2 from the small oil pipe 42, and use power to push the hydraulic jet pump 2 into the working cylinder 1 until the b6 sealing part 213 cooperates with the a6 sealing part 132. At the same time, the b1 sealing part 24, the b2 sealing part 25 and the a2 sealing part 114 cooperate to close the first hole 113, the b3 sealing part 26 and the b4 sealing part 27 cooperate with the a3 sealing part 116 and the a4 sealing part 119 respectively to close the second hole 118, the b5 sealing part 212 cooperates with the a5 sealing part 1111 to close the third cavity 1110 and the fourth cavity 1112, and the b6 sealing part 213 cooperates with the a6 sealing part 132 to close the fourth cavity 1112 and the fifth cavity 134.

[0058] S3. In the initial stage of production, the power fluid enters from the small oil pipe 42, enters through the first power liquid inlet hole 22, enters the nozzle 28 through the internal channel of the hydraulic jet pump 2, forms a jet at the nozzle 28, and forms a relatively low-pressure area in the third cavity 1110. Under the action of formation pressure, the formation fluid pushes open the floating valve 135, enters from the first liquid inlet 214 of the hydraulic jet pump 2, enters the third cavity 1110 from the second liquid outlet 211 through the internal channel, mixes with the power fluid at the throat 29 to form a mixed liquid, and the mixed liquid enters the fourth cavity 1112 through the first liquid outlet 210 of the hydraulic jet pump 2, and enters the second channel 136 through the third hole 1113 on the inner pump barrel 11, and returns to the ground along the annulus of the large oil pipe 41 and the small oil pipe 42.

[0059] S4, final preparation, hydraulically lift out the hydraulic jet pump 2, the power fluid enters the working cylinder 1 through the annulus of the large oil pipe 41 and the small oil pipe 42, then enters the fourth cavity 1112 along the second channel 136 and the third hole 1113, enters the third cavity 1110 through the first liquid outlet 210 and the throat 29, enters the fifth cavity 134 through the second liquid outlet 211 and the first liquid inlet 214, and pushes the traveling valve 135 to close, and under the action of the power fluid, the hydraulic jet pump 2 is pushed out of the inner pump cylinder 11 and pushed to the ground.

[0060] The hydraulic piston pump 3 is dropped from the small oil pipe 42, and the power fluid pushes the hydraulic piston pump 3 to be inserted into the working cylinder 1 until the c6 sealing part 314 cooperates with the a7 sealing part 133. At the same time, the c1 sealing part 34 and the c2 sealing part 36 cooperate with the a3 sealing part 116, so that the fourth hole 35 is connected with the first hole 113. The c3 sealing part 38 and the c4 sealing part 39 cooperate with the a3 sealing part 116 and the a4 sealing part 119 respectively, so that the power-lost liquid outlet 376 is connected with the second hole 118. The c5 sealing part 313 cooperates with the a5 sealing part 1111 to close the third cavity 1110 and the fourth cavity 1112. The c6 sealing part 314 cooperates with the a7 sealing part 133 to close the fourth cavity 1112 and the fifth cavity 134.

[0061] S5. At the end of production, the piston pump suction stroke is as follows: the power fluid enters from the small oil pipe 42, enters the interior of the hydraulic piston pump 3 through the second power fluid inlet hole 32 below the second fishing head 31, enters the first cavity 115 through the first channel 112, and enters the reversing mechanism through the power fluid inlet 375 on the hydraulic piston pump 3. The reversing mechanism distributes the power fluid to the lower part of the driving piston of the piston mechanism, driving the piston 373 upward, and the liquid on the upper part of the driving piston 373 enters the second channel 136 through the fourth hole 35 and the first hole 113. The driving piston 373 drives the pump end piston 377 upward through the connecting rod 374, and the liquid on the upper part of the pump end piston 377 enters the second channel 136 through the power-losing outlet 376; a relatively low-pressure area is formed at the lower part of the pump end piston 377. At this time, the discharge valve 316 is in a closed state under the action of the pressure difference, while the inlet valve 310 and the floating valve 135 are in an open state, and the formation fluid enters the fifth cavity 134, enters the third cavity 1110 through the third inlet 315 and the fourth outlet 317 of the hydraulic piston pump 3, and enters the lower part of the pump end piston 377 through the second inlet 311 and the inlet valve 310.

[0062] The piston pump discharge stroke is as follows: the power fluid enters from the small oil pipe 42, enters the inside of the hydraulic piston pump 3 through the second power liquid inlet hole 32 below the second fishing head 31, enters the first cavity 115 through the first channel 112, and enters the piston mechanism through the power liquid inlet 375 on the hydraulic piston pump 3. The reversing mechanism distributes the power fluid to the upper part of the pump end piston 377, drives the pump end piston 377 downward, and the liquid below the pump end piston 377 enters the liquid inlet valve 310 and the liquid discharge valve 316. Under the action of the liquid pressure, the liquid inlet valve 310 is in a closed state, and the liquid discharge valve 316 is pushed to an open state, and enters the second channel 136 through the third liquid outlet 312 and the third hole 1113, and returns to the ground along the annulus of the large oil pipe 41 and the small oil pipe 42. The pump end piston 377 moves downward, driving the driving piston 373 downward through the connecting rod 374. The liquid in the lower part of the driving piston 373 enters the second channel 136 through the power-loss outlet 376 and the second hole 118. The liquid in the second channel 136 enters the upper part of the driving piston 373 as the driving piston 373 moves downward.

[0063] The method for hydraulically lifting out the hydraulic piston pump 3 is as follows: the power fluid enters the working cylinder 1 through the annulus of the large oil pipe 41 and the small oil pipe 42, and enters the fourth cavity 1112 along the second channel 136 and the third hole 1113. At that time, the drain valve 316 is in a closed state, and the power fluid accumulates in the fourth cavity 1112. Since the cross-sectional area of ​​the c5 sealing part 313 is larger than the cross-sectional area of ​​the c6 sealing part 314, the hydraulic piston pump 3 is subjected to an upward lifting force and detaches from the working cylinder 1, and returns to the ground along the small oil pipe 42 under the action of the power fluid.

[0064] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A concentric double-tube well completion integrated production device, characterized in that: include: Working cylinder (1) and hydraulic pump; The working cylinder (1) comprises an inner pump cylinder (11) and an outer pump cylinder (13), the inner pump cylinder (11) and the outer pump cylinder (13) are both hollow cylinders with openings at both ends, and the inner pump cylinder (11) is fixedly connected to the inner wall of the outer pump cylinder (13); The inner pump barrel (11) is provided with: an a1 sealing portion (111), a first channel (112), a first hole (113), an a2 sealing portion (114), a first cavity (115), an a3 sealing portion (116), a second cavity (117), a second hole (118), an a4 sealing portion (119), a third cavity (1110), an a5 sealing portion (1111), a fourth cavity (1112), and a third hole (1113); the first cavity (115), the second cavity (117), the third cavity (1110), and the fourth cavity (1112) are sequentially arranged in the inner pump barrel (11) from top to bottom; the a1 sealing portion (111) is arranged on the inner wall at the top of the inner pump barrel (11); and the first hole (113) is arranged on the first cavity (115). The a2 sealing portion (114) is arranged above the cavity (115) on both sides of the first hole (113), the a3 sealing portion (116) is arranged between the first cavity (115) and the second cavity (117), the second hole (118) is arranged on the inner wall of the second cavity (117), the a4 sealing portion (119) is arranged between the second cavity (117) and the third cavity (1110), the a5 sealing portion (1111) is arranged between the third cavity (1110) and the fourth cavity (1112), the third hole (1113) is arranged on the side wall of the fourth cavity (1112), the third hole (1113) is communicated with the second channel (136), and the first channel (112) is connected to the first cavity (115); The outer pump barrel (13) is provided with: a second connecting portion (131), an a6 sealing portion (132), an a7 sealing portion (133), a fifth cavity (134), a floating valve (135), and a second passage (136); the second connecting portion (131) is provided at the upper end opening of the outer pump barrel (13); the second connecting portion (131) is connected to the large oil pipe (41); the fifth cavity (134) is provided near the lower end opening of the outer pump barrel (13); the floating valve (135) is provided in the fifth cavity (134); the a6 sealing portion (132) and the a7 sealing portion (133) are provided above the fifth cavity (134) in order from top to bottom; and a second passage (136) is formed between the inner pump barrel (11) and the outer pump barrel (13); The hydraulic pump is installed in the inner pump barrel (11); In the initial preparation stage, the hydraulic pump is a hydraulic jet pump (2); the hydraulic jet pump (2) comprises: a first fishing head (21), a first lifting leather cup (23), a first power liquid inlet hole (22), a nozzle (28), a throat (29), a first liquid outlet (210), a second liquid outlet (211), and a first liquid inlet (214); the first power liquid inlet hole (22) is arranged above the hydraulic jet pump (2); the nozzle (28) and the throat (29) are arranged between the first power liquid inlet hole (22) and the first liquid inlet (214); the first liquid outlet (210) and the second liquid outlet (211) are arranged between the throat (29) and the first liquid inlet (214); the first liquid outlet (210) is communicated with the throat (29); the second liquid outlet (211) is communicated with the first liquid inlet (214); the first fishing head (21) is fixedly arranged on the top of the hydraulic jet pump (2); the first lifting leather cup (23) is arranged between the first power liquid inlet hole (22) and the first liquid inlet (214); The bowl (23) is arranged below the first power liquid inlet hole (22).

1. The hydraulic jet pump (2) further comprises: a b1 sealing portion (24), a b2 sealing portion (25), a b3 sealing portion (26), a b4 sealing portion (27), a b5 sealing portion (212), and a b6 sealing portion (213). The b1 sealing portion (24), the b2 sealing portion (25), the b3 sealing portion (26), the b4 sealing portion (27), the b5 sealing portion (212), and the b6 sealing portion (213) are The part (213) is arranged on the outer wall of the hydraulic jet pump (2), the b1 sealing part (24) and the b2 sealing part (25) cooperate with the a2 sealing part (114), the b3 sealing part (26) and the b4 sealing part (27) cooperate with the a3 sealing part (116) and the a4 sealing part (119) respectively, the b5 sealing part (212) cooperates with the a5 sealing part (1111), and the b6 sealing part (213) cooperates with the a6 sealing part (132); In the final preparation stage, the hydraulic pump is a hydraulic piston pump (3), and the hydraulic piston pump (3) comprises: a second fishing head (31), a second lifting leather cup (33), a second power liquid inlet hole (32), a fourth hole (35), a reversing mechanism, a piston mechanism, a liquid inlet valve (310), a second inlet (311), a liquid discharge valve (316), a third liquid outlet (312), a fourth liquid outlet (317), and a third liquid inlet (315), wherein the second power liquid inlet hole (32) is arranged above the hydraulic piston pump (3), the fourth hole (35) is arranged on the hydraulic piston pump (3), the piston mechanism is arranged below the fourth hole (35) and connected to the fourth hole (35), the second inlet (311), the third liquid outlet (312) and the third liquid inlet (315) are connected to each other. ) is arranged below the piston mechanism and is connected to the piston mechanism, the second inlet (311) is provided with a liquid inlet valve (310), the third liquid outlet (312) is provided with a liquid discharge valve (316), the fourth liquid outlet (317) is connected to the third liquid inlet (315), the fourth liquid outlet (317) is arranged below the piston mechanism, the second fishing head (31) is fixedly arranged at the top of the hydraulic piston pump (3), the second lifting leather cup (33) is arranged below the second power liquid inlet hole (32), the piston mechanism comprises: a first piston chamber (371), a second piston chamber (372), a driving piston (373), a connecting rod (374), and a pump end piston (377), the upper end of the first piston chamber (371) is connected to the second piston chamber (372), and the second piston chamber (373) is connected to the third piston chamber (372). The first piston chamber (371) and the second piston chamber (372) are connected to each other through four holes (35); the lower part of the second piston chamber (372) is connected to the second inlet (311) and the third liquid outlet (312); the driving piston (373) is slidably disposed in the first piston chamber (371); the pump end piston (377) is slidably disposed in the second piston chamber (372); the driving piston (373) and the pump end piston (377) are connected via a connecting rod (374); the hydraulic piston pump (3) further comprises: a c1 sealing portion (34), a c2 sealing portion (36), a c3 sealing portion (38), a c4 sealing portion (39), a c5 sealing portion (313), and a c6 sealing portion (314); the c1 sealing portion (34), the c2 sealing portion (36), the c3 sealing portion (38), and the c4 sealing portion The c1 sealing portion (34) and the c2 sealing portion (36) cooperate with the a2 sealing portion (114); the c3 sealing portion (38) and the c4 sealing portion (39) cooperate with the a3 sealing portion (116) and the a4 sealing portion (119) respectively; the c5 sealing portion (313) cooperates with the a5 sealing portion (1111); the c6 sealing portion (314) cooperates with the a7 sealing portion (133); the reversing mechanism comprises a power fluid inlet (375) and a power-loss fluid outlet (376); the reversing mechanism is sleeved on a connecting rod between a driving piston and a pump end piston; the reversing mechanism and the connecting rod are slidably matched.

2. The concentric double-tube well completion integrated production device according to claim 1, characterized in that: The working cylinder (1) further comprises a sealing plug (12), the sealing plug (12) being a hollow cylinder with openings at both ends, a first connecting portion (121) being provided at the upper opening of the sealing plug (12), the first connecting portion (121) being connected to the small oil pipe (42), and the sealing plug (12) being matched with the a1 sealing portion (111).

3. An oil and gas production process, comprising: producing according to a concentric double-tube well completion integrated production device according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Equipment installation: fixedly connecting the small oil pipe (42) to the first connecting portion (121) of the sealing plug (12), and fixedly connecting the large oil pipe (41) to the second connecting portion (131) of the working cylinder (1); S2, initial preparation, the hydraulic jet pump (2) is lowered from the small oil pipe (42), and the power fluid pushes the hydraulic jet pump (2) into the working cylinder (1) until the b6 sealing part (213) is matched with the a6 sealing part (132); S3. In the initial stage of production, the power fluid enters through the small oil pipe (42), forms a mixed liquid in the hydraulic jet pump (2), and then returns to the surface along the annulus of the large oil pipe (41) and the small oil pipe (42); S4, final preparation, hydraulically pull out the hydraulic jet pump (2), lower the hydraulic piston pump (3) from the small oil pipe (42), and use the power fluid to push the hydraulic piston pump (3) into the working cylinder (1) until the c6 sealing part (314) is matched with the a7 sealing part (133); S5. At the end of production, power fluid enters from the small oil pipe (42) to drive the hydraulic piston pump (3) to suck the formation fluid and discharge it to the annulus of the large oil pipe (41) and the small oil pipe (42) and return it to the surface.

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