An integrated concentric tube water drive oil pump device

Abstract

The present invention belongs to the technical field of oil and gas production equipment, and specifically relates to an integrated concentric tube water-driven oil pump device, including a working cylinder and a hydraulic pump, wherein the working cylinder includes an inner pump cylinder and an outer pump cylinder, wherein both the inner pump cylinder and the outer pump cylinder are hollow cylinders with openings at both ends, wherein the lower end opening of 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 at the initial and final stages of production, thereby avoiding well repair operations by replacing the lifting tools; in the initial stage, the lifting advantages of the hydraulic jet pump, such as large liquid volume and strong sand carrying and discharge capabilities, are utilized for production, and in the final stage, the advantages of the hydraulic oil pump, such as high efficiency and low energy consumption, are utilized for production; 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. It saves operating expenses, improves production timeliness, and reduces production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas production equipment, and in particular relates to an integrated concentric tube water drive oil pump device. Background Art

[0002] In the process of exploitation of oil and gas fields (including coal-bed methane), in order to extract oil and gas from underground, some oil wells use specific technologies. These technologies include hydraulic oil pumping and hydraulic jet pump lifting processes, which are used to lift the oil and water in the reservoir from the bottom of the well to the surface.

[0003] The significant advantages of hydraulic oil pumps include: first, high pump efficiency, with a total efficiency of 40% to 60%; second, relatively low energy consumption during overall operation. However, it also has some shortcomings, such as relatively low liquid production, and when encountering sand or coal powder in the formation, the reversing mechanism is prone to jamming or wear, resulting in failure to work properly.

[0004] The hydraulic jet pump has its unique advantages: first, it also supports hydraulic tripping and lowering operations, without the need for an operating machine to intervene, saving costs; second, it has a large liquid production volume; and finally, because its downhole pump has no relatively moving parts, it can still maintain a certain sand carrying and discharge capacity when facing sand production in the formation or severe coal powder conditions. However, the pump efficiency of the hydraulic jet pump is relatively low, with a total efficiency usually not exceeding 25%, and the overall operating energy consumption is high.

[0005] In the development process of oil and gas fields, especially coalbed methane wells, there is an obvious production feature: in the early stage of production, the formation produces a large amount of liquid and contains a lot of sand and coal powder; in the later stage of production, the liquid production is significantly reduced, and the amount of sand and coal powder is also greatly reduced. Therefore, in actual operation, it is usually chosen to use hydraulic jet pumps in the early stage to carry out large amounts of liquid to carry sand or coal powder, and in the later stage, it is replaced with hydraulic pumps, pumping units or other lifting processes.

[0006] However, it is not easy to change the lifting process in this production process. It requires two different downhole tools, and the surface equipment and processes also need to be replaced or adjusted accordingly. In addition, well repair operations are required, which not only increases production costs, but also reduces production time, thereby reducing profits.

[0007] Therefore, it is necessary to study an integrated concentric tube water drive oil pump device. This device needs to be applicable to both hydraulic jet pumps and hydraulic oil pumps. In the early stage, when the liquid production is large and contains a lot of sand or coal powder, a hydraulic jet pump can be used to carry out large amounts of liquid to carry sand or coal powder; in the later stage, when the liquid production is reduced and the sand or coal powder is small, the jet pump can be hydraulically pulled out, and the center pipe is connected to the hydraulic oil pump from the small oil pipe to complete the installation and reduce energy consumption. Such an integrated concentric tube water drive oil pump device will undoubtedly greatly improve the development efficiency and economic benefits of oil and gas fields. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, the present invention provides an integrated concentric tube water drive oil well pump device.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A concentric tube water drive oil pump integrated device, comprising: a working cylinder and a hydraulic pump;

[0011] 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 lower opening of the inner pump cylinder is fixedly connected to the inner wall of the outer pump cylinder;

[0012] The inner pump barrel comprises: an a1 sealing portion, an a2 sealing portion, and a first cavity, wherein the first cavity is arranged in the inner pump barrel, the a1 sealing portion is arranged on the inner wall of the upper end of the inner pump barrel, and the a2 sealing portion is arranged on the inner wall above the first cavity;

[0013] The outer pump barrel comprises: an a3 sealing portion, a first outer pump barrel hole, a second channel, a second cavity, a traveling valve and a first channel, wherein the second cavity is arranged at the lower end opening of the outer pump barrel, the traveling valve is arranged in the second cavity, the a3 sealing portion is arranged between the first cavity and the second cavity, the second channel is arranged on the side wall of the outer pump barrel, the second channel communicates the first cavity and the second cavity, the first channel is arranged between the inner pump barrel and the outer pump barrel, and the first outer pump barrel hole is connected to the first channel;

[0014] The hydraulic pump is installed in the inner pump barrel.

[0015] Furthermore, the working cylinder also includes a sealing plug, which is installed at the upper end opening of the inner pump cylinder, and the sealing plug cooperates with the a1 sealing part. A first connecting part connected to the small oil pipe is provided on the inner wall of the upper end opening of the sealing plug.

[0016] Furthermore, the outer pump barrel also includes a second connecting portion, which is arranged on the inner wall of the opening at the upper end of the outer pump barrel, and the second connecting portion is connected to the large oil pipe.

[0017] Furthermore, the hydraulic pump is a hydraulic jet pump, which includes a hydraulic jet pump liquid inlet, a nozzle, a throat and a hydraulic jet pump hole. The hydraulic jet pump liquid inlet is arranged at the upper end of the hydraulic jet pump, the nozzle and the throat are arranged inside the hydraulic jet pump, the hydraulic jet pump hole matched with the first outer pump barrel hole is arranged at the lower end of the hydraulic jet pump, the hydraulic jet pump liquid inlet is connected to the nozzle, and the throat is connected to the hydraulic jet pump hole.

[0018] Furthermore, the hydraulic jet pump also includes: a b1 seal, a b2 seal and a b3 seal, and the b1 seal, b2 seal and b3 seal are arranged on the outer wall of the hydraulic jet pump in sequence from top to bottom, and the b1 seal cooperates with the a2 seal part, and the b2 seal and b3 seal cooperate with the a3 seal part to seal the first cavity and the second cavity.

[0019] Furthermore, the hydraulic jet pump also includes a fishing head and a lifting leather cup, wherein the fishing head is arranged at the top end of the hydraulic jet pump, and the lifting leather cup is arranged below the liquid inlet hole of the hydraulic jet pump.

[0020] Furthermore, the hydraulic pump is a hydraulic oil pump, which includes an oil pump barrel and a piston assembly. The piston assembly is slidably installed in the oil pump barrel, and the upper end of the hydraulic oil pump is connected to the central oil pipe.

[0021] Furthermore, the oil pump barrel is provided with: a first piston chamber, a first hydraulic oil pump hole, a second piston chamber, a hydraulic oil pump inlet hole, an inlet valve, a hydraulic oil pump discharge hole, a discharge valve, and a second hydraulic oil pump hole. The first piston chamber is arranged above the oil pump barrel, the second piston chamber is arranged below the first piston chamber, the first hydraulic oil pump hole is arranged below the first piston chamber, the hydraulic oil pump inlet hole is arranged below the second piston chamber, the inlet valve is installed above the hydraulic oil pump inlet hole, the second hydraulic oil pump hole matched with the first outer pump barrel hole is arranged below the hydraulic oil pump, the hydraulic oil pump discharge hole connects the second piston chamber and the second hydraulic oil pump hole, and the discharge valve is installed on the hydraulic oil pump discharge hole.

[0022] Furthermore, the hydraulic oil pump also includes: a c2 seal, a c4 seal, and a c5 seal, which are arranged on the hydraulic oil pump in sequence from top to bottom, and the c2 seal cooperates with the a2 seal, and the c4 seal and the c5 seal cooperate with the a3 seal to seal the first cavity and the second cavity.

[0023] Furthermore, the piston assembly includes: a driving piston, a c1 seal, a connecting rod, a pump-end piston, and a c3 seal. The driving piston is slidably arranged in the first piston chamber, and the pump-end piston is slidably arranged in the second piston chamber. The driving piston and the pump-end piston are connected by a connecting rod. The driving piston is equipped with a c1 seal, and the pump-end piston is equipped with a c3 seal.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention discloses a concentric tube water drive oil pump integrated device. A set of lifting tools is used in the initial and final stages of production, thereby avoiding well repair operations by replacing the lifting tools. The hydraulic jet pump has the advantages of large liquid volume and strong sand carrying and discharge capacity in the initial stage of production, while the hydraulic pump has the advantages of high efficiency and low energy consumption in the final stage of production. 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. The operation cost is saved, the production time efficiency is improved, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the working cylinder;

[0027] Figure 2 It is a structural schematic diagram of a hydraulic jet pump;

[0028] Figure 3 This is a schematic diagram of the production status of the hydraulic jet pump;

[0029] Figure 4 It is a structural schematic diagram of a hydraulic oil pump;

[0030] Figure 5 It is a schematic diagram of the hydraulic oil pump suction stroke;

[0031] Figure 6 Schematic diagram of the hydraulic oil pump discharge stroke.

[0032] The reference numerals involved in the accompanying drawings are:

[0033] 1. Working cylinder; 11. Inner pump cylinder; 111. A1 sealing part; 112. A2 sealing part; 113. First cavity; 12. Sealing plug; 121. First connecting part; 13. Outer pump cylinder; 131. Second connecting part; 132. A3 sealing part; 133. First outer pump cylinder hole; 134. Second passage; 135. Second cavity; 136. Traveling valve; 137. First passage; 2. Hydraulic jet pump; 21. Fishing head; 22. Liquid inlet hole of hydraulic jet pump; 23. Lifting leather cup; 24. B1 sealing part; 25. Nozzle; 26. Throat; 27. B2 sealing part; 28. Hydraulic jet pump hole; 29 , b3 seal; 3, hydraulic oil pump; 31, oil pump barrel; 311, first piston chamber; 312, first hydraulic oil pump hole; 313, second piston chamber; 314, c2 seal; 315, hydraulic oil pump inlet hole; 316, inlet valve; 317, hydraulic oil pump discharge hole; 318, discharge valve; 319, c4 seal; 3110, second hydraulic oil pump hole; 3111, c5 seal; 321, drive piston; 322, c1 seal; 323, connecting rod; 324, pump end piston; 325, c3 seal; 41, large oil pipe; 42, small oil pipe; 43, center oil pipe. DETAILED DESCRIPTION

[0034] 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.

[0035] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0036] 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.

[0037] Embodiment 1

[0038] See also Figures 1 to 3 As shown, a concentric tube water drive oil pump integrated device comprises: a working cylinder 1 and a hydraulic pump.

[0039] The working cylinder 1 comprises an inner pump cylinder 11 and an outer pump cylinder 13, both of which are hollow cylinders with openings at both ends, and the lower opening of the inner pump cylinder 11 is fixedly connected to the inner wall of the outer pump cylinder 13;

[0040] The inner pump barrel 11 includes: an a1 sealing portion 111, an a2 sealing portion 112, and a first cavity 113. The first cavity 113 is arranged in the inner pump barrel 11. The a1 sealing portion 111 is arranged on the inner wall of the upper end of the inner pump barrel 11. The a2 sealing portion 112 is arranged on the inner wall above the first cavity 113. Specifically, the working barrel 1 also includes a sealing plug 12, which is installed at the upper end opening of the inner pump barrel 11. The sealing plug 12 cooperates with the a1 sealing portion 111. The inner wall of the upper end opening of the sealing plug 12 is provided with a first connecting portion 121 connected to the small oil pipe 42.

[0041] The outer pump barrel 13 includes: an a3 sealing portion 132, a first outer pump barrel hole 133, a second channel 134, a second cavity 135, a traveling valve 136 and a first channel 137. The second cavity 135 is arranged at the lower end opening of the outer pump barrel 13. The traveling valve 136 is arranged in the second cavity 135. The a3 sealing portion 132 is arranged between the first cavity 113 and the second cavity 135. The second channel 134 is arranged on the side wall of the outer pump barrel 13. The second channel 134 connects the first cavity 113 and the second cavity 135. The first channel 137 is arranged between the inner pump barrel 11 and the outer pump barrel 13. The first outer pump barrel hole 133 is connected to the first channel 137. Specifically, the outer pump barrel 13 also includes a second connecting portion 131, which is arranged on the inner wall of the upper end opening of the outer pump barrel 13 and is connected to the large oil pipe 41.

[0042] The hydraulic pump is installed in the inner pump barrel 11. Specifically, the hydraulic pump is a hydraulic jet pump 2, which includes a hydraulic jet pump liquid inlet hole 22, a nozzle 25, a throat 26 and a hydraulic jet pump hole 28. The hydraulic jet pump liquid inlet hole 22 is arranged at the upper end of the hydraulic jet pump 2, the nozzle 25 and the throat 26 are arranged inside the hydraulic jet pump 2, and the hydraulic jet pump hole 28 matched with the first outer pump barrel hole 133 is arranged at the lower end of the hydraulic jet pump 2, the hydraulic jet pump liquid inlet hole 22 is connected to the nozzle 25, and the throat 26 is connected to the hydraulic jet pump hole 28.

[0043] The hydraulic jet pump 2 also includes: a b1 seal 24, a b2 seal 27 and a b3 seal 29, which are arranged on the outer wall of the hydraulic jet pump 2 in sequence from top to bottom, and the b1 seal 24 cooperates with the a2 seal part 112, and the b2 seal 27 and b3 seal 29 cooperate with the a3 seal part 132, for sealing the first cavity 113 and the second cavity 135.

[0044] The hydraulic jet pump 2 further comprises a fishing head 21 and a lifting leather cup 23 . The fishing head 21 is arranged at the top of the hydraulic jet pump 2 , and the lifting leather cup 23 is arranged below the liquid inlet hole 22 of the hydraulic jet pump.

[0045] It can be understood that the hydraulic jet pump 2 is dropped into the small oil pipe, and the hydraulic jet pump 2 is pushed into the inner pump barrel 11 under the action of the power fluid to complete the installation of the hydraulic jet pump 2; the power fluid enters the annulus between the large oil pipe 41 and the small oil pipe 42, and enters the second cavity 135 through the first outer pump barrel hole 133, the hydraulic jet pump hole 28, and the second channel 134 of the throat 26, so that the floating valve 136 is in a closed state, thereby realizing the hydraulic lifting of the hydraulic jet pump 2.

[0046] It can be understood that when the hydraulic jet pump 2 is working, the power fluid enters through the hydraulic jet pump inlet hole 22, passes through the nozzle 25, and forms a relatively low-pressure area in the first cavity 113. Under the action of the formation pressure, the formation fluid pushes open the floating valve 136, and enters the first cavity 113 through the second channel 134, mixes with the power fluid in the throat 26 to form a mixed liquid, and then enters the first channel 137 through the hydraulic jet pump hole 28 and returns to the ground through the annulus between the large oil pipe 41 and the small oil pipe 42.

[0047] Embodiment 2

[0048] See also Figures 4 to 6As shown, the difference between this embodiment and the first embodiment is that the hydraulic pump is a hydraulic oil pump 3, and the hydraulic oil pump 3 includes an oil pump barrel 31 and a piston assembly. The piston assembly is slidably installed in the oil pump barrel 31, and the upper end of the hydraulic oil pump 3 is connected to the central oil pipe 43. Specifically, the oil pump barrel 31 is provided with: a first piston chamber 311, a first hydraulic oil pump hole 312, a second piston chamber 313, a hydraulic oil pump inlet hole 315, an inlet valve 316, a hydraulic oil pump discharge hole 317, a discharge valve 318, and a second hydraulic oil pump hole 3110. The first piston chamber 311 is arranged above the oil pump barrel 31, the second piston chamber 313 is arranged below the first piston chamber 311, and the first hydraulic oil pump hole 312 is arranged at the bottom of the second piston chamber 313. Below a piston chamber 311, the hydraulic oil pump inlet hole 315 is arranged below the second piston chamber 313, the inlet valve 316 is installed on the hydraulic oil pump inlet hole 315, the second hydraulic oil pump hole 3110 cooperating with the first outer pump barrel hole 133 is arranged below the hydraulic oil pump 3, the hydraulic oil pump discharge hole 317 connects the second piston chamber 313 and the second hydraulic oil pump hole 3110, and the discharge valve 318 is installed on the hydraulic oil pump discharge hole 317.

[0049] The hydraulic oil pump 3 also includes: a c2 seal 314, a c4 seal 319, and a c5 seal 3111. The c2 seal 314, c4 seal 319, and c5 seal 3111 are arranged on the hydraulic oil pump 3 in sequence from top to bottom. The c2 seal 314 cooperates with the a2 seal part 112, and the c4 seal 319 and c5 seal 3111 cooperate with the a3 seal part 132 to seal the first cavity 113 and the second cavity 135. Specifically, the cross-sectional area of ​​the first piston cavity 311 is larger than the cross-sectional area of ​​the second piston cavity 313.

[0050] The piston assembly includes: a driving piston 321, a c1 seal 322, a connecting rod 323, a pump-end piston 324, and a c3 seal 325. The driving piston 321 is slidably disposed in the first piston chamber 311, and the pump-end piston 324 is slidably disposed in the second piston chamber 313. The driving piston 321 and the pump-end piston 324 are connected via a connecting rod 323. The driving piston 321 is provided with a c1 seal 322, and the pump-end piston 324 is provided with a c3 seal 325.

[0051] It can be understood that the upper end of the hydraulic oil pump 3 is connected to the central oil pipe 43 and then lowered into the small oil pipe until the hydraulic oil pump 3 reaches the inner pump barrel 11, and the installation of the hydraulic oil pump 3 is completed.

[0052] Suction stroke: the power fluid enters through the annulus of the central oil pipe 43 and the small oil pipe 42, and enters the bottom of the first piston chamber 311 through the first hydraulic pump hole 312 of the pump barrel 31. Since the cross-sectional area of ​​the first piston chamber 311 is larger than the cross-sectional area of ​​the second piston chamber 313, the driving piston 321 is pushed upward, and the pump-end piston 324 is driven to slide upward through the connecting rod 323. At this time, a low-pressure area is formed under the pump-end piston 324, the inlet valve 316 is opened, and the drain valve 318 is closed. The formation fluid enters the second cavity 135 through the floating valve 136 and the second channel 134, and enters under the pump-end piston 324 through the inlet valve 316.

[0053] Discharge stroke: the power fluid enters through the central oil pipe 43, and the power fluid acts on the top of the driving piston 321, pushing the driving piston 321 and the pump-end piston 324 downward, and the liquid between the driving piston 321 and the pump-end piston 324 enters the annulus between the central oil pipe 43 and the small oil pipe 42 through the first hydraulic pump hole 312, and returns to the ground. At the same time, the liquid under the pump-end piston 324 is compressed. At this time, the discharge valve 318 is opened and the inlet valve 316 is closed. The liquid enters the annulus between the large oil pipe 41 and the small oil pipe 42 through the second hydraulic pump hole 3110, the first outer pump barrel hole 133, and the first channel 137, and returns to the ground.

[0054] 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 tube water drive oil well pump integrated device, characterized in that: include: A working cylinder (1) and a hydraulic pump; The working cylinder (1) comprises an inner pump cylinder (11) and an outer pump cylinder (13), wherein the inner pump cylinder (11) and the outer pump cylinder (13) are both hollow cylinders with openings at both ends, and the lower opening of the inner pump cylinder (11) is fixedly connected to the inner wall of the outer pump cylinder (13); The inner pump barrel (11) comprises: an a1 sealing portion (111), an a2 sealing portion (112), and a first cavity (113); the first cavity (113) is arranged in the inner pump barrel (11); the a1 sealing portion (111) is arranged on the inner wall at the upper end of the inner pump barrel (11); and the a2 sealing portion (112) is arranged on the inner wall above the first cavity (113); The outer pump barrel (13) comprises: an a3 sealing portion (132), a first outer pump barrel hole (133), a second channel (134), a second cavity (135), a floating valve (136) and a first channel (137); the second cavity (135) is arranged at the lower end opening of the outer pump barrel (13); the floating valve (136) is arranged in the second cavity (135); the a3 sealing portion (132) is arranged between the first cavity (113) and the second cavity (135); the second channel (134) is arranged on the side wall of the outer pump barrel (13); the second channel (134) communicates with the first cavity (113) and the second cavity (135); a first channel (137) is arranged between the inner pump barrel (11) and the outer pump barrel (13); the first outer pump barrel hole (133) is connected to the first channel (137); In the initial stage of production, the hydraulic pump is a hydraulic jet pump (2), and the hydraulic jet pump (2) comprises a hydraulic jet pump liquid inlet hole (22), a nozzle (25), a throat (26), and a hydraulic jet pump hole (28). The hydraulic jet pump liquid inlet hole (22) is arranged at the upper end of the hydraulic jet pump (2), the nozzle (25) and the throat (26) are arranged inside the hydraulic jet pump (2), and the hydraulic jet pump hole (28) matched with the first outer pump barrel hole (133) is arranged at the lower end of the hydraulic jet pump (2), the hydraulic jet pump liquid inlet hole (22) is connected to the nozzle (25), and the throat (26) is connected to the hydraulic jet pump hole (28). The hydraulic jet pump (2) further comprises: b1 sealing member (24 ), b2 seal (27) and b3 seal (29), the b1 seal (24), b2 seal (27) and b3 seal (29) being arranged on the outer wall of the hydraulic jet pump (2) in order from top to bottom, the b1 seal (24) cooperating with the a2 seal (112), the b2 seal (27) and b3 seal (29) cooperating with the a3 seal (132), for sealing the first cavity (113) and the second cavity (135), the hydraulic jet pump (2) further comprising a fishing head (21) and a lifting leather cup (23), the fishing head (21) being arranged at the top end of the hydraulic jet pump (2), and the lifting leather cup (23) being arranged below the liquid inlet hole (22) of the hydraulic jet pump; At the end of production, the hydraulic pump is a hydraulic oil pump (3), the hydraulic oil pump (3) comprising an oil pump barrel (31) and a piston assembly, the piston assembly being slidably mounted in the oil pump barrel (31), the upper end of the hydraulic oil pump (3) being connected to a central oil pipe (43), the oil pump barrel (31) being provided with: a first piston chamber (311), a first hydraulic oil pump hole (312), a second piston chamber (313), a hydraulic oil pump inlet hole (315), an inlet valve (316), a hydraulic oil pump discharge hole (317), a discharge valve (318), and a second hydraulic oil pump hole (3110), the first piston chamber The first outer pump barrel hole (311) is arranged above the oil pump barrel (31), the second piston chamber (313) is arranged below the first piston chamber (311), the first hydraulic oil pump hole (312) is arranged below the first piston chamber (311), the hydraulic oil pump liquid inlet hole (315) is arranged below the second piston chamber (313), the liquid inlet valve (316) is installed on the hydraulic oil pump liquid inlet hole (315), the second hydraulic oil pump hole (3110) matched with the first outer pump barrel hole (133) is arranged below the hydraulic oil pump (3), and the hydraulic oil pump liquid discharge hole (317) communicates with the second piston chamber (313) and the first outer pump barrel hole (133). The hydraulic oil pump (3) further comprises a second hydraulic oil pump hole (3110), the drain valve (318) being mounted on the hydraulic oil pump drain hole (317), the hydraulic oil pump (3) further comprising: a c2 seal (314), a c4 seal (319), and a c5 seal (3111), the c2 seal (314), the c4 seal (319), and the c5 seal (3111) being arranged on the hydraulic oil pump (3) in sequence from top to bottom, the c2 seal (314) cooperating with the a2 seal portion (112), and the c4 seal (319) and the c5 seal (3111) cooperating with the a3 seal portion (132), for sealing the first cavity. (113) and a second cavity (135), the piston assembly comprising: a driving piston (321), a c1 seal (322), a connecting rod (323), a pump-end piston (324), and a c3 seal (325), the driving piston (321) being slidably disposed in the first piston cavity (311), the pump-end piston (324) being slidably disposed in the second piston cavity (313), the driving piston (321) and the pump-end piston (324) being connected via a connecting rod (323), the driving piston (321) being provided with a c1 seal (322), and the pump-end piston (324) being provided with a c3 seal (325); The hydraulic pump is installed in the inner pump barrel (11).

2. The concentric tube water drive oil well pump integrated device according to claim 1, characterized in that: The working cylinder (1) further comprises a sealing plug (12), wherein the sealing plug (12) is installed at the upper opening of the inner pump cylinder (11), the sealing plug (12) cooperates with the a1 sealing portion (111), and a first connecting portion (121) connected to the small oil pipe (42) is provided on the inner wall of the upper opening of the sealing plug (12).

3. The concentric tube water drive oil well pump integrated device according to claim 1, characterized in that: The outer pump barrel (13) further comprises a second connecting portion (131), the second connecting portion (131) being arranged on the inner wall of the upper opening of the outer pump barrel (13), the second connecting portion (131) being connected to the large oil pipe (41).

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