Electric hydraulic transmission mechanism

Abstract

The invention belongs to the technical field of well repair in oil and gas field development, and relates to an electric hydraulic transmission mechanism which comprises a connector assembly, a hydraulic power transmission part, a connecting sleeve, a hydraulic driving part and a lower connector which are sequentially connected. Wherein the hydraulic power transmission part comprises a valve body, an electromagnetic valve, a connecting pipe, a connecting shell, a control element, a pump frame, a hydraulic pump, a motor, a hydraulic mechanism shell and an oil cylinder; the hydraulic driving part comprises a middle pipe, a piston outer sleeve, a piston, a piston spring and a balance hydraulic cylinder. According to the mechanism, the communication condition between the hydraulic oil flow channels is controlled through the electromagnetic valve, the pressure in the mechanism is maintained to be balanced through the overflow valve, the problem that an existing mechanical electric well repairing tool cannot be unanchored due to the fact that power cannot be suddenly cut off after being anchored frequently is solved, and the mechanism can be used for anchoring and setting of a packer.

Description

Technical Field

[0001] The present invention belongs to the technical field of workover in oil and gas field development, and relates to an electro-hydraulic transmission mechanism. Background Art

[0002] In downhole electric workover technology, downhole transmission involves two specific technologies. One is the motor lead screw transmission technology, and the other is the electro-hydraulic transmission technology. At present, the main technologies involved in electric workover mainly focus on the pure mechanical aspect of motor lead screw transmission. This transmission method has the following problems downhole: First, the power generated by the transmission is insufficient, resulting in unstable transmission. Second, once the downhole tool gets stuck, only the cable can be forcibly lifted to release the stuck, and there is no better measure to release the stuck.

[0003] Because hydraulic transmission is equipped with various hydraulic circuits and realizes the transmission of the mechanism through the control of valves, it has the functions of stable transmission and automatic release of stuck after power failure. Therefore, it is necessary to develop electro-hydraulic transmission technology. Summary of the Invention

[0004] In order to solve the problems in the background art, the present invention designs an electro-hydraulic transmission mechanism, and the technical scheme adopted is as follows:

[0005] An electro-hydraulic transmission mechanism, comprising:

[0006] A joint assembly 1, a hydraulic power transmission part, a connecting sleeve 14, a hydraulic drive part, and a lower joint 19; the joint assembly 1, the hydraulic power transmission part, the connecting sleeve 14, the hydraulic drive part, and the lower joint 19 are connected in sequence;

[0007] Among them, the hydraulic power transmission part includes: a valve body 2, a solenoid valve 3, a connecting pipe 4, a connecting shell 5, a control element, a pump bracket 10, a hydraulic pump 11, a motor 12, a hydraulic mechanism housing 13, and an oil cylinder 21;

[0008] The hydraulic drive part includes: an intermediate pipe 15, a piston outer sleeve 16, a piston 17, a piston spring 18, and a balance hydraulic cylinder 22;

[0009] Further, one end of the valve body 2 is connected to the joint assembly 1, and the other end is fixedly connected to the connecting shell 5 inside and fixedly connected to the hydraulic mechanism housing 13 outside;

[0010] Further, one end of the hydraulic mechanism housing 13 is fixedly connected to the valve body 2, and the other end is connected to the drive part through the connecting sleeve 14; the inner cavity of the hydraulic mechanism housing 13 is the oil cylinder 21;

[0011] Further, a solenoid valve 3 is installed on the valve body 2;

[0012] Further, there is a hydraulic oil flow passage inside the valve body 2, and an M port for injecting hydraulic oil, and H, I, and G ports for the hydraulic oil flow passage are provided on the valve body 2.

[0013] Further, one end of the pump bracket 10 is fixedly connected to the valve body 2 through the connection shell 5, and the other end of the pump bracket 10 is connected to the motor 12.

[0014] Preferably, control elements are installed inside the pump bracket 10: a pressure sensor 6, an overflow valve gland 7, an overflow valve 8, and a check valve 9.

[0015] The pressure sensor 6 is connected to port D of the hydraulic flow passage.

[0016] One end of the overflow valve 8 is equipped with an overflow valve gland 7, and the other end is connected to port E of the hydraulic flow passage.

[0017] One end of the check valve 9 is connected to port C of the hydraulic flow passage, and the other end is connected to port F of the hydraulic flow passage.

[0018] Further, the connecting pipe 4 is arranged inside the connection shell 5. One end of the connecting pipe 4 is connected to the internal flow passage of the valve body 2 through port H, and one end is connected to port C through the check valve 9 at port F.

[0019] Further, the hydraulic pump 11 and the motor 12 are connected by a coupling and fixed to the pump bracket 10 with screws; hydraulic oil ports A and B are also provided on the hydraulic pump 11.

[0020] Further, the components 3 - 12 are all immersed in the oil cylinder 21.

[0021] Further, for the connecting sleeve 14, externally it connects the hydraulic mechanism housing 13 and the piston outer sleeve 16, and internally it is connected to the intermediate pipe 15; internally it is connected to the intermediate pipe 15.

[0022] Further, one end of the piston outer sleeve 16 is connected to the connecting sleeve 14, and the other end is connected to the lower joint 19.

[0023] Further, an intermediate pipe 15, a piston 17, a piston spring 18, and a balance hydraulic cylinder 22 are provided inside the piston outer sleeve 16.

[0024] Further, one end of the piston spring 18 is connected to the piston 17, and the other end is connected to the lower joint 19.

[0025] Further, the piston spring 18 can drive the piston 17 to slide on the intermediate pipe 15; sealing rubber rings are provided on both the inner diameter and outer diameter of the piston 17.

[0026] Further, a plug 20 is also provided on the lower joint 19; the plug 20 is embedded in the lower joint 19 and is connected to the internal intermediate pipe 15.

[0027] Preferably, the solenoid valve 3 is a two-position two-way solenoid valve;

[0028] Preferably, the specific type of the hydraulic pump is a piston pump.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] This mechanism is provided with a piston pump. By pressing with the piston pump to push the hydraulic oil, and through the operation of the two-position two-way solenoid valve to open the hydraulic oil passage, the hydraulic oil can be pushed to anchor and set other mechanisms; an overflow valve is provided to maintain the pressure inside the mechanism and ensure that the pressure is within the allowable range of use. It solves the problem that the current mechanical and electric workover tools often cannot be unanchored due to sudden power failure after anchoring, and can be used for the setting of packers and the anchoring part of pipe string cutting.

[0031] Other features and advantages of the present invention will be described in the following specification, and partly will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the electro-hydraulic transmission mechanism of the present invention;

[0033] Figure 2 It is the upper half of the schematic diagram of the electro-hydraulic transmission mechanism for anchoring and setting in the embodiment of the present invention;

[0034] Figure 3 It is the lower half of the schematic diagram of the electro-hydraulic transmission mechanism for anchoring and setting in the embodiment of the present invention.

[0035] In the figure: joint assembly 1, valve body 2, solenoid valve 3, connecting pipe 4, connecting shell 5, pressure sensor 6, overflow valve cap 7, overflow valve 8, check valve 9, pump bracket 10, hydraulic pump 11, motor 12, hydraulic mechanism housing 13, connecting sleeve 14, intermediate pipe 15, piston outer sleeve 16, piston 17, piston spring 18, lower joint 19, plug 20, oil cylinder 21, balance hydraulic cylinder 22, electronic joint 23, packer 24, hydraulic anchor 25, central pipe 26, rubber cylinder 27, anchor claw 28, anchor claw spring 29; hydraulic oil flow ports: A, B, C, D, E, F, G, H, I, J, M. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following will be further described in detail by combining with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Reference is now made to the accompanying drawings to describe exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The embodiments have a progressive relationship. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art; the terms in the exemplary embodiments shown in the drawings are not limitations on the present invention.

[0038] Embodiment 1

[0039] As shown in the Figure 1 accompanying drawings, a hydraulic oil inlet M port, hydraulic oil flow ports H, I, and G are provided on the valve body 2; a solenoid valve 3 is installed on the valve body 2 to control the opening and closing of the hydraulic oil passage. When energized, the solenoid valve 3 moves to open, closing the passage between H and G and opening the passage between H and I; when de-energized, the solenoid valve 3 moves to close, connecting the passage between G and H.

[0040] As shown in the Figure 1 accompanying drawings, control elements are installed in the pump bracket 10: a pressure sensor 6, an overflow valve gland 7, an overflow valve 8, and a check valve 9;

[0041] Among them, the pressure sensor 6 is connected to the D port of the hydraulic passage, and the pressure state inside the entire valve body 2 during the operation of the solenoid valve 3 can be monitored at any time through the ground control device;

[0042] It should be noted that the ground control device is a conventional technology in the art, and its main function is to analyze the uploaded data and issue commands. The specific structure does not fall within the protection scope of the present invention and will not be described in detail here.

[0043] One end of the overflow valve 8 is equipped with an overflow valve gland 7, and the other end is connected to the E port of the hydraulic passage; the overflow valve 8 is used to protect the entire hydraulic transmission system. When the pressure inside the valve body 2 is higher than the set warning value, the hydraulic oil in the internal passage of the hydraulic mechanism can flow out through the E port of the overflow valve 8 to keep the pressure inside the valve body 2 constant;

[0044] One end of the check valve 9 is connected to the C port of the hydraulic passage, and the other end is connected to the F port of the hydraulic passage; among them, the hydraulic oil flow port of the check valve 9 is the C port for the inlet and the F port for the outlet, and the hydraulic oil flows unidirectionally from C to F; the connecting pipe 4 is arranged in the connecting shell 5. One end of the connecting pipe 4 is connected to the internal passage of the valve body 2 through the H port, and one end is connected to the F port through the check valve 9, enabling the hydraulic oil to flow from C - F - H through the connecting pipe 4.

[0045] Among them, the solenoid valve 3 is a two-position two-way solenoid valve; the specific type of the hydraulic pump is a piston pump.

[0046] The specific working principle of the electro-hydraulic transmission mechanism is as follows:

[0047] The electro-hydraulic drive mechanism is connected to the joint assembly 1 through a cable and is lowered into a specified position inside the work string. First, hydraulic oil is injected into the oil cylinder 21 inside the mechanism from port M, so that components 3 - 12 are all immersed in the oil cylinder 21; further, the hydraulic oil can flow through the intermediate pipe 15. After the balance hydraulic cylinder 22 is filled with hydraulic oil, the piston spring 18 pushes the piston 17 to slide on the intermediate pipe 15 from position ① to position ②.

[0048] When powered on, first use the ground control equipment to control the solenoid valve 3 to open, close the flow path between H and G, and open the flow path between H and I. Then use the ground control equipment to control the downhole motor 12 to drive the hydraulic pump 11 to operate. The hydraulic oil in the oil cylinder 21 inside the mechanism enters the hydraulic pump 11 through the upper flow path inlet A of the pump rack 10, is pumped out from the outlet B and flows into the inlet C at the check valve 9, and then passes through the internal flow path in sequence through the outlet F of the check valve 9, through the connecting pipe 4 to port H and then through port I to achieve the pressure transmission of the hydraulic oil.

[0049] During the whole process, the pressure at port D of the hydraulic oil can be detected through the pressure sensor 6 on the ground to monitor the pressure of the entire electro-hydraulic drive mechanism system; when the pressure of the entire hydraulic system reaches the pressure setting warning value of the relief valve 8, the relief valve cap 7 inside the relief valve 8 will be opened to open port E, realizing the connection of the A - B - E flow ports, so that the hydraulic oil is discharged from port E of the relief valve 8 to ensure pressure balance and thus achieve the function of system protection; with the continuous pumping of the hydraulic oil, through the pulling-back function of the piston 17 and the piston spring 18, it moves between positions ① and ②, and the transmission is stable to achieve the overall balance between the inside of the mechanism and the downhole liquid.

[0050] Embodiment 2

[0051] On the basis of the above embodiment, as shown in the attached Figures 2 - 3 figure, it is a schematic diagram of the electro-hydraulic drive mechanism for anchoring and setting packers in the embodiment of the present invention.

[0052] The electro-hydraulic drive mechanism is sequentially connected to the electronic joint 23, the packer 24, and the hydraulic anchor 25 through the joint assembly 1; a rubber cylinder 27 is attached to the outside of the packer 24, and the internal cavity is the central pipe 26; a certain number of anchor claws 28 ( Figure 3 only 4 are shown) are provided on the hydraulic anchor 26, and an anchor claw spring 29 is provided inside the anchor claw 28 and connected to the hydraulic anchor 26.

[0053] The working process of the electro-hydraulic drive mechanism after being connected to the packer and the hydraulic anchor is as follows:

[0054] When powered on, after the hydraulic pump builds up pressure, the solenoid valve 3 is opened by the ground control equipment, closing the flow path between H and G and opening the flow path between H and I. The hydraulic oil inside the mechanism enters the hydraulic pump 11 through the flow path inlet A of the pump frame 10, is pumped out from the outlet B and flows to port C, then passes through the internal flow path through ports F, H, and I in sequence. The hydraulic oil enters port J from port I through the hydraulic pipeline, and then enters the inside of the packer 24. The hydraulic oil expands the rubber barrel 27 through the central pipe 26. At the same time, through internal pressure buildup, under the hydraulic pressure generated by the internal and external pressure difference, the hydraulic oil expands the anchor claws 27 of the hydraulic anchor 25 outward through the anchor claw spring 28 of the hydraulic anchor 25, and the anchor claws 27 are extended and embedded on the casing, realizing the anchoring of the pipe string and the setting of the packer.

[0055] When powered off, the solenoid valve 3 closes. At this time, the flow path between G and H is connected, and the hydraulic oil pressure acting on the packer 24 and the hydraulic anchor 25 is released through the flow paths of ports J, I, H, and G. At this time, the rubber barrel 27 contracts, and the anchor claws of the hydraulic anchor 25 reset under the elastic force of the anchor claw spring 28, releasing the anchoring, i.e., releasing the stuck, and the workover tool can be smoothly retrieved through the cable.

[0056] The embodiments described above only represent the implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. The present invention can also be implemented in other specific manners or other specific forms without departing from the gist or essential features of the present invention. Therefore, the described implementation manners should be regarded as illustrative rather than restrictive in any aspect. The scope of the present invention should be defined by the appended claims, and any equivalent changes to the intention and scope of the claims should also be included within the scope of the present invention.

Claims

1. An electro-hydraulic transmission mechanism, comprising a joint assembly (1), a hydraulic power transmission part, a connecting sleeve (14), a hydraulic drive part, and a lower joint (19), characterized in that, The joint assembly (1) has its hydraulic power transmission part, connecting sleeve (14), hydraulic drive part, and lower joint (19) connected in sequence. Among them, the hydraulic power transmission part includes: valve body (2), solenoid valve (3), connecting pipe (4), connecting shell (5), control element, pump bracket (10), hydraulic pump (11), electric motor (12), hydraulic mechanism housing (13), and oil cylinder (21). Among them, the hydraulic drive part includes: intermediate pipe (15), piston outer sleeve (16), piston (17), piston spring (18), and balance hydraulic cylinder (22).

2. An electro-hydraulic transmission mechanism according to claim 1, characterized in that, One end of the valve body (2) is connected to the joint assembly (1), and the other end is fixedly connected to the connecting shell (5) inside and to the hydraulic mechanism housing (13) outside.

3. An electro-hydraulic transmission mechanism according to claim 1, characterized in that, One end of the hydraulic mechanism housing (13) is fixedly connected to the valve body (2), and the other end is connected to the drive part through the connecting sleeve (14); the inner cavity of the hydraulic mechanism housing (13) is the oil cylinder (21).

4. An electro-hydraulic transmission mechanism according to claim 1 or 2, characterized in that, The solenoid valve (3) is installed on the valve body (2).

5. An electro-hydraulic transmission mechanism according to claim 1, characterized in that, The valve body (2) has a hydraulic oil flow passage inside, and a hydraulic oil injection port M, and hydraulic oil flow ports H, I, and G are opened on the valve body (2).

6. The electro-hydraulic transmission mechanism according to claim 1, characterized in that, One end of the pump bracket (10) is fixedly connected to the valve body (2) through the connecting shell (5), and the other end of the pump bracket (10) is connected to the electric motor (12).

7. An electro-hydraulic transmission mechanism according to claim 1 or 6, characterized in that, Control elements are installed inside the pump bracket (10): pressure sensor (6), overflow valve cap (7), overflow valve (8), and check valve (9).

8. An electro-hydraulic transmission mechanism according to claim 7, characterized in that, The pressure sensor (6) is connected to port D of the hydraulic flow passage.

9. An electro-hydraulic transmission mechanism according to claim 7, characterized in that, One end of the overflow valve (8) is equipped with an overflow valve cap (7), and the other end is connected to port E of the hydraulic flow passage.

10. An electro-hydraulic transmission mechanism according to claim 7, characterized in that, One end of the check valve (9) is connected to port C of the hydraulic flow passage, and the other end is connected to port F of the hydraulic flow passage.

11. An electro-hydraulic transmission mechanism according to claim 1, characterized in that, The connecting pipe (4) is arranged inside the connecting shell (5). One end of the connecting pipe (4) is connected to the inner flow passage of the valve body (2) through port H, and one end is connected to port C through the check valve (9) at port F.

12. A kind of electro-hydraulic transmission mechanism according to claim 1, characterized in that, The hydraulic pump (11) and the electric motor (12) are connected by a coupling and fixed to the pump bracket (10) by screws.

13. An electro-hydraulic transmission mechanism according to claim 12, characterized in that, The hydraulic pump (11) is also provided with hydraulic oil flow ports A and B.

14. An electro-hydraulic transmission mechanism according to claim 1, characterized in that, The solenoid valve (3), connecting pipe (4), connecting shell (5), control element, pump bracket (10), hydraulic pump (11), and electric motor (12) are all immersed in the oil cylinder (21).

15. An electro-hydraulic transmission mechanism according to claim 1, characterized in that, The connecting sleeve (14) is externally connected to the hydraulic mechanism housing (13) and the piston outer sleeve (16), and internally connected to the intermediate pipe (15).

16. An electro-hydraulic transmission mechanism according to claim 1 or 15, characterized in that, One end of the piston outer sleeve (16) is connected to the connecting sleeve (14), and the other end is connected to the lower joint (19).

17. An electro-hydraulic transmission mechanism according to claim 16, characterized in that, The intermediate pipe (15), piston (17), piston spring (18), and balance hydraulic cylinder (22) are arranged inside the piston outer sleeve (16).

18. An electro-hydraulic transmission mechanism according to claim 17, characterized in that, One end of the piston spring (18) is connected to the piston (17), and the other end is connected to the lower joint (19).

19. An electro-hydraulic transmission mechanism according to claim 17 or 18, characterized in that, The piston spring (18) can drive the piston (17) to slide on the intermediate pipe (15); the piston (17) is provided with sealing rubber rings on both the inner diameter and outer diameter.

20. The electro-hydraulic transmission mechanism according to claim 1, characterized in that, A plug (20) is also provided on the lower joint (19).

21. An electro-hydraulic transmission mechanism according to claim 20, characterized in that, The plug (20) is embedded in the lower adapter (19) and connected to the internal intermediate pipe (15).

22. The electro-hydraulic transmission mechanism according to claim 4, characterized in that, The solenoid valve (3) is a two-position two-way solenoid valve.

23. A kind of electro-hydraulic transmission mechanism according to claim 1, characterized in that, The specific type of the hydraulic pump (11) is a piston pump.

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