A pressure replenishing device and pressure replenishing method for female wet joint

Abstract

The invention discloses a pressure replenishing device and a pressure replenishing method for a female wet joint, relates to the technical field of joint docking in oil wells, and solves the technical problem that the existing wet joint inner cavity pre-oil pressure is insufficient, resulting in the joint being easily damaged. The device comprises a vacuum tank body, wherein a wet joint female head and an oil replenishing tool are arranged in the vacuum tank body, wherein the wet joint female head comprises a fixing frame, an outer shell is mounted on the fixing frame, and a through hole communicating with the vacuum tank body is opened on the outer shell, an inner rubber sleeve and an outer rubber sleeve are arranged in the outer shell, both the inner rubber sleeve and the outer rubber sleeve are sealing components fixed inside the outer shell, and oil injection pins are respectively inserted in the inner rubber sleeve and the outer rubber sleeve, and oil is injected by the oil injection tool in a vacuum environment, and then at normal temperature and pressure, the oil injection tool is pulled out and the pressure replenishing device is inserted to inject oil and pressurize the inside of the wet joint female head, thereby increasing the oil liquid difference between the internal and external environments, so as to adapt to the environmental requirements of deep-sea operations of the female wet joint.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well underground joint docking, and more specifically to the technical field of a pressure replenishing device and a pressure replenishing method for a female wet joint. Background Art

[0002] With the continuous development of oil and gas exploration and development technology, downhole wet joint tools have made great progress. Pressure balance capsule structures are commonly used to meet the needs of wet joint docking in the well.

[0003] The female wet joint in the existing vacuum tank body adopts a pressure-balanced capsule structure, which increases the oil storage space and can fully compensate for the internal pressure. However, the joint is prone to rupture due to a sharp change in pressure during docking, resulting in a decrease in the internal insulation effect and even logging failure. The joint must be filled with oil when leaving the factory, and the oil filling effect is not good.

[0004] After oiling with the existing oil-filling joint, the oil in the instrument balancer cavity is sprayed or overflowed under pressure during the joint disassembly process, which can easily cause inaccurate pre-oil pressure inside and outside the joint cavity, and the sprayed oil can easily contaminate the equipment. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems and provide a pressure replenishing device and a pressure replenishing method for a female wet joint.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A pressure replenishing device and pressure replenishing method for a female wet joint, comprising a wet joint female head placed in a vacuum tank, an oil filling tool for filling oil into the wet joint female head, and an oil replenishing tool for replenishing oil into the wet joint female head;

[0008] The wet connector female head comprises a fixing frame, a shell is mounted on the fixing frame, a first through hole communicating with the vacuum tank body is opened on the shell, an inner rubber sleeve and an outer rubber sleeve are arranged in the shell, and the inner rubber sleeve is mounted inside the outer rubber sleeve, and the inner rubber sleeve and the outer rubber sleeve are both fixed inside the shell;

[0009] The oil filling tool has an oil filling pin, which is inserted into the inner cavity of the inner rubber sleeve and the inner cavity of the outer rubber sleeve, and the oil filling pin is respectively provided with oil filling holes which are interconnected with the inner cavity of the inner rubber sleeve and the inner cavity of the outer rubber sleeve;

[0010] The oil replenishing tooling has an oil replenishing pin, which is inserted into the inner cavity of the inner rubber sleeve, and an oil replenishing side hole communicating with the inner cavity of the inner rubber sleeve is opened on the oil replenishing pin.

[0011] As a preferred solution, a plurality of inner rubber sleeves are installed in the outer rubber sleeve, and the plurality of inner rubber sleeves are distributed at equal intervals along the circumferential direction.

[0012] As a preferred solution, a piston assembly is provided in the inner rubber sleeve, and the piston assembly abuts against the oil replenishing tooling.

[0013] As a preferred solution, the piston assembly includes a metal outer cylinder, the piston assembly includes a first conductive copper core located in an inner rubber sleeve and a second conductive copper core sleeved with the first conductive copper core, piston rods are arranged in the inner cavities of the first conductive copper core and the second conductive copper core, the piston rod is slidably connected along its axis in the first conductive copper core, a spring is arranged at one end of the piston rod, one end of the spring is connected to the piston rod, and the other end of the spring is connected to the first conductive copper core, and the other end of the piston rod abuts against a corresponding pin.

[0014] As a preferred solution, a cavity for limiting the position of the second conductive copper core is opened on the side of the first conductive copper core, and the cavity is located at the connection between the first conductive copper core and the second conductive copper core.

[0015] As a preferred solution, the end of the second conductive copper core is inserted into the cavity portion of the first conductive copper core and is clamped on the inner wall of the cavity.

[0016] As a preferred solution, the oil replenishing tooling includes a base platform, the oil replenishing tooling includes a base platform, a sealed cavity is provided in the base platform, an oil inlet hole connected to the sealed cavity is provided on one side of the base platform, an oil replenishing pin is arranged on the other side of the base platform, the oil replenishing pin has a through hole therein and is interconnected with the sealed cavity, and an oil replenishing side hole is provided at the axial end of the oil replenishing pin.

[0017] As a preferred solution, the base platform includes a base plate and a cover plate, the base plate is provided with a receiving groove for receiving oil, the receiving groove is located in the gap between the base plate and the cover plate, and the base plate and the cover plate are fastened together.

[0018] A method for replenishing pressure of a female wet joint, the steps of replenishing pressure of a vacuum tank are as follows:

[0019] Step 1: The wet joint female and the oil filling tool are assembled together through a fixing frame, and the oil filling pin of the oil filling tool is inserted into the wet joint female, and the oil filling pin of the oil filling tool is inserted into the inner and outer rubber sleeves, and the two oil filling holes on the oil filling pin are respectively located in the cavities of the inner and outer rubber sleeves; when the oil filling pin is inserted into the wet joint female, the oil filling pin pushes the piston rod to compress the spring in the inner cavity of the conductive copper core;

[0020] Step 2: Place the wet joint female and the oil injection device fixed together in a vacuum tank, and use the vacuum tank to extract the internal air to form a vacuum cavity, and then inject the oil into the internal space of the wet joint female through the oil injection hole of the oil injection device; and the two oil injection holes of the oil injection needle enter the inner cavity of the inner rubber sleeve and the inner cavity of the outer rubber sleeve respectively, until the inner cavity of the inner rubber sleeve, the inner cavity of the outer rubber sleeve and the cavity of the vacuum tank are hydraulically consistent;

[0021] Step 3: After the assembled wet connector female and the oil injection tool are taken out of the vacuum tank as a whole, the oil injection tool is taken out. When the oil injection tool is pulled out, the spring reset in the piston assembly causes the piston rod to pop out immediately when the oil injection tool is pulled out, and the end of the piston rod abuts against the through hole where the pin enters the inner rubber sleeve cavity and seals the lip, completing the oil injection process;

[0022] Step 4: The oil replenishing tool is inserted into the female head of the wet joint. The oil replenishing pin of the oil replenishing tool passes through the inner cavity of the outer rubber sleeve and enters the inner cavity of the inner rubber sleeve. The oil replenishing pin is inserted into the inner cavity of the inner rubber sleeve and pushes the piston rod to compress the spring in the inner cavity of the conductive copper core. After the oil replenishing tool is filled with oil, the cavity hydraulic pressure of the inner rubber sleeve is greater than the cavity hydraulic pressure of the outer rubber sleeve.

[0023] Step 5: When the oil filling pin of the oil filling tool is pulled out of the inner rubber sleeve cavity, the spring reset causes the piston rod to pop out immediately when the oil filling tool is pulled out, and the pin abutted by the end of the piston rod enters the through hole of the inner rubber sleeve cavity and seals the lip, completing the oil filling process.

[0024] In step 4, the volume of the inner cavity of the rubber sleeve inserted by the pin of the oil filling tool is A, and the oil filling amount range of the oil filling tool is: A<oil filling amount of the oil filling tool<2A.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. In order to avoid the problem that the pressure inside and outside the oil injection cannot meet the deep-sea pressure balance due to the sudden change of pressure during docking, which may cause the joint to rupture and reduce the internal insulation effect, a pressure-replenishing device that can be applied to the female wet joint is designed to replenish the pressure and complete the internal oil replenishment and pressurization. Through the pressure-replenishing device, the oil in the vacuum tank body injected under vacuum conditions in the early stage can achieve its fast and efficient pressure-replenishing operation.

[0027] 2. The piston assembly is replenished with oil through the oil replenishing tooling, and the oil in the inner rubber sleeve increases, causing the internal pressure of the inner rubber sleeve to be greater than the external pressure, and the gap liquid between the inner layer and the outer layer is squeezed outward layer by layer from the inside to the outside, and finally the oil outside the rubber sleeve is discharged through the through hole of the outer sleeve to the gap between the oil replenishing tank body and the outer sleeve, and then the oil replenishment and pressurization work of the outermost gap of the oil replenishing tank body is completed, and finally the oil pressure inside the tank body is greater than the oil pressure outside the tank body.

[0028] 3. Multiple inner rubber sleeves are designed, and the oil replenishing tooling simultaneously replenishes oil to each piston assembly installed in the multiple inner rubber sleeves, causing the volume of the multiple inner rubber sleeves to expand, and then the hydraulic pressure efficiency of the oil in the outer rubber sleeve is improved faster.

[0029] 4. The structure of sealing the via hole after oil filling and oil filling is designed. When oil filling or oil filling, the piston rod will be compressed by the conductive copper core extrusion spring. After the oil filling or oil filling tooling is pulled out, the spring pushes the piston rod to abut against the oil filling via hole, thereby automatically sealing the inner rubber cavity, the outer rubber cavity and the tank body cavity. At the same time, the pressure in the outer rubber cavity is greater than the pressure in the tank body cavity, which causes the piston rod surface to fit tightly against the pin and enter the outer rubber cavity.

[0030] 5. Design a specific oil replenishment tooling structure, the oil from the pin enters the rubber bag of the piston assembly, the replenished oil enters the sealing chamber through the oil inlet hole, and then the oil entering the sealing chamber enters the rubber bag through the side hole of the pin, completing the oil replenishment and pressurization in the rubber bag in the piston assembly, meeting the simultaneous oil replenishment work for multiple piston assemblies, and improving the convenience and practicality of the overall oil replenishment of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall structure of the oil replenishing tooling of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the oil injection tooling of the present invention;

[0034] Figure 4 Is a schematic cross-sectional structure diagram of the oil filling tooling of the present invention;

[0035] Figure 5 It is a schematic diagram of the cross-sectional structure of the wet connector female head of the present invention;

[0036] Figure 6 The present invention Figure 5 A1 is an enlarged schematic diagram of the structure;

[0037] Reference numerals:

[0038] 1-oil filling tool, 2-wet connector female, 3-housing, 4-fixing frame, 5-oil filling pin, 6-outer rubber sleeve, 7-inner rubber sleeve, 8-piston assembly, 9-first conductive copper core, 10-second conductive copper core, 11-piston rod, 12-first through hole, 13-oil filling hole, 14-oil inlet hole, 15-sealing chamber, 16-oil filling pin, 17-oil filling side hole, 18-bottom plate, 19-cover plate, 20-spring, 21-oil filling tool. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1:

[0041] like Figure 1-Figure 6 As shown, this embodiment provides a pressure replenishing device and a pressure replenishing method for a female wet joint, comprising a wet joint female head 2 placed in a vacuum tank body, an oil filling tool 21 for filling oil into the wet joint female head 2, and an oil filling tool 1 for filling oil into the wet joint female head 2; wherein, the wet joint female head 2 comprises a fixing frame 4, a shell 3 is mounted on the fixing frame 4, and a first through hole 12 which communicates with the vacuum tank body is opened on the shell 3, an inner rubber sleeve 7 and an outer rubber sleeve 6 are arranged in the shell 3, and the inner rubber sleeve 7 is mounted on Inside the outer rubber sleeve 6, the inner rubber sleeve 7 and the outer rubber sleeve 6 are both fixed inside the outer shell 3; the oil filling tool 21 has an oil filling pin 5, which is inserted into the inner cavity of the inner rubber sleeve 7 and the inner cavity of the outer rubber sleeve 6, and the oil filling pin is respectively provided with oil filling holes 13 which are interconnected with the inner cavity of the inner rubber sleeve 7 and the inner cavity of the outer rubber sleeve 6; the oil replenishing tool 1 has an oil replenishing pin 16, which is inserted into the inner cavity of the inner rubber sleeve 7, and the oil replenishing pin is provided with an oil replenishing side hole 17 which is interconnected with the inner cavity of the inner rubber sleeve 7.

[0042] In the above structure, if Figure 3 and Figure 4It can be seen that the two oil filling holes 13 opened on the oil filling pin 5 of the oil filling tool 21 are B1 and B2 respectively, B1 is located in the inner cavity of the outer rubber sleeve 6, and B2 is located in the inner cavity of the inner rubber sleeve 7. When filling oil, the wet joint female 2 and the oil filling tool 21 are placed in the vacuum tank, the oil filling tool 21 connects the oil filling pin to the wet joint female 2, and then fills oil into the wet joint female 2 through the oil filling hole 13 of the oil filling tool 21, and then replenishes oil. When replenishing oil, the oil replenishing tool 1 replenishes oil into the inner cavity of the inner rubber sleeve 7, so that the oil pressure of the inner rubber sleeve 7 is increased, and then the oil pressure inside the inner rubber sleeve 7 is formed to be stronger than the oil pressure outside the inner rubber sleeve 7. When the hydraulic pressure is strong, the volume of the inner rubber sleeve 7 expands. After the oil outside the inner rubber sleeve 7 is squeezed, the outer rubber sleeve 6 bulges outward. When the wet joint female head 2 is placed in a deep-sea environment, the internal air pressure of the inner rubber sleeve 7 is greater than the external air pressure of the wet joint female head, ensuring that the pressures of the inner and outer environments of the outer rubber sleeve 6 are balanced. Secondly, through this pressure replenishment method, the oil filling pin of the oil filling tooling is inserted into the inner rubber sleeve 7. The oil filling pin will occupy part of the space due to its own volume. After the subsequent oil filling pin is pulled out, the internal pressure of the inner rubber sleeve 7 is reduced. After the oil is replenished, the situation of insufficient internal oil pressure in the vacuum tank is avoided. Embodiment 2:

[0043] This embodiment is carried out based on the previous embodiment. Figure 1-Figure 6 As shown, multiple inner rubber sleeves 7 are installed in the outer rubber sleeve 6, and the multiple inner rubber sleeves 7 are evenly spaced along the circumferential direction. The oil replenishing tool 1 is used to replenish oil by installing multiple inner rubber sleeve 7 inner cavity piston assemblies respectively, so as to cause the volume of the multiple inner rubber sleeves 7 to expand.

[0044] A piston assembly 8 is arranged in the inner rubber sleeve 7 , and the piston assembly 8 abuts against the oil replenishing fixture 1 .

[0045] At the same time, a specific structure of the closed through hole inside the inner rubber sleeve 7 is provided: the piston assembly 8 includes a first conductive copper core 9 located in the inner rubber sleeve 7 and a second conductive copper core 10 sleeved with the first conductive copper core 9, a piston rod 11 is arranged in the inner cavity of the first conductive copper core 9 and the second conductive copper core 10, the piston rod 11 slides in the first conductive copper core 9 along the central axis direction, a spring 20 is arranged at one end of the piston rod 11, one end of the spring 20 is connected to the piston rod 11, and the other end of the spring 20 is connected to the inner wall of the first conductive copper core 9, and the other end of the piston rod 11 abuts on the corresponding pin; the piston rod 11 moves in the inner cavity of the first conductive copper core 9 and the second conductive copper core 10. The piston rod 11 moves and moves left and right along the central axis of the conductive copper core. A spring 20 is provided for resetting the piston rod 11. When filling oil, the oil filling pin 5 is inserted to push the piston rod 11 to move to the left. When the oil filling pin 5 is taken out, the spring 20 pushes the piston rod 11 to block the inlet and outlet of the oil filling pin 5 inserted into the outer rubber sleeve 6. The same principle is used to make the piston rod 11 move left when the oil filling pin 16 enters the outer rubber sleeve 6 in a normal pressure environment and in a vacuum environment during oil filling. When the oil filling pin 16 is withdrawn, the spring 20 pushes the piston rod 11 to block the inlet and outlet of the oil filling pin 5 inserted into the outer rubber sleeve 6, thereby isolating the cavity in the outer rubber sleeve 6 from the cavity in the vacuum tank body.

[0046] A cavity for limiting the second conductive copper core 10 is opened on the side of the first conductive copper core 9, and the cavity is located at the connection between the first conductive copper core 9 and the second conductive copper core 10; the end of the second conductive copper core 10 is inserted into the cavity part of the first conductive copper core 9 and clamped on the inner wall of the cavity. Embodiment 3:

[0047] This embodiment is carried out based on the previous embodiment. Figure 1-Figure 6 As shown, the oil replenishing tool 1 includes a base platform, a sealed cavity 15 is provided in the base platform, an oil inlet hole 14 connected to the sealed cavity 15 is provided on one side of the base platform, and an oil replenishing pin 16 is arranged on the other side of the base platform, the oil replenishing pin 16 has a through hole in it and is interconnected with the sealed cavity 15, and a side hole is provided at the axial end of the oil replenishing pin 16 and is interconnected with the inner cavity of the inner rubber sleeve 7; the base platform includes a base plate 18 and a cover plate 19, and a receiving groove for containing oil is provided on the base plate 18, and the receiving groove is located in the gap between the base plate 18 and the cover plate 19, and the base plate 18 and the cover plate 19 are fastened together; when in use, its pin is inserted into the rubber bag of the piston assembly 8, and the replenished oil enters the sealed cavity 15 through the oil inlet hole 14, and then the oil entering its sealed cavity 15 enters the inner cavity of the inner rubber sleeve 7 through the side hole of the oil replenishing pin 16, thereby completing the oil replenishment and pressurization of the inner cavity of the inner rubber sleeve 7 in the piston assembly 8. Embodiment 4:

[0048] A method for replenishing pressure of a female wet joint, the steps of replenishing pressure of a vacuum tank are as follows:

[0049] Step 1: The wet connector female and the oil filling tool are assembled together through a fixing frame, and the oil filling pin of the oil filling tool is inserted into the wet connector female, and the oil filling pin 5 of the oil filling tool 21 is inserted into the inner and outer rubber sleeves 6, and the two oil filling holes 13 on the oil filling pin 5 are respectively located in the cavities of the inner and outer rubber sleeves; when the oil filling pin 5 is inserted into the wet connector female, the oil filling pin 5 pushes the piston rod 11 to compress the spring 20 in the inner cavity of the conductive copper core;

[0050] Step 2: Place the wet joint female connector and the oil injection device fixed together in a vacuum tank, and use the vacuum tank to extract the internal air to form a vacuum cavity, and then inject the oil into the internal space of the wet joint female connector through the oil injection hole of the oil injection device; and the two oil injection holes 13 of the oil injection needle 5 enter the inner cavity of the inner rubber sleeve 7 and the inner cavity of the outer rubber sleeve 6 respectively, until the inner cavity of the inner rubber sleeve 7, the inner cavity of the outer rubber sleeve 6 and the cavity of the vacuum tank are hydraulically consistent;

[0051] Step 3: After the assembled wet connector female and the oil injection tool are taken out of the vacuum tank as a whole, when the oil injection tool is taken out and the oil injection tool 21 is pulled out, the spring 20 in the piston assembly 8 is reset to cause the piston rod 11 to pop out immediately when the oil injection tool 21 is pulled out, and the end of the piston rod 11 abuts against the through hole where the pin enters the cavity of the inner rubber sleeve 7 and seals the lip, completing the oil injection process;

[0052] Step 4: The oil replenishing tool 1 is inserted into the female end of the wet joint, and the oil replenishing pin 16 of the oil replenishing tool 1 passes through the inner cavity of the outer rubber sleeve 6 and enters the inner cavity of the inner rubber sleeve 7. The oil replenishing pin 16 is inserted into the inner cavity of the inner rubber sleeve 7 and pushes the piston rod 11 to compress the spring 20 in the inner cavity of the conductive copper core. After the oil replenishing tool 1 replenishes oil, the cavity hydraulic pressure of the inner rubber sleeve 7 is greater than the cavity hydraulic pressure of the outer rubber sleeve 6.

[0053] Step 5: When the oil filling pin 16 of the oil filling tool is pulled out of the cavity of the inner rubber sleeve 7, the spring 20 is reset to cause the piston rod 11 to pop out immediately when the oil filling tool 21 is pulled out, and the pin abutted by the end of the piston rod 11 enters the through hole of the cavity of the inner rubber sleeve 7 and seals the lip, completing the oil filling process;

[0054] Meanwhile, in step 4, the volume of the inner cavity of the rubber sleeve inserted by the pin of the oil replenishing tool 1 is A, and the oil replenishing amount of the oil filling tool 21 is in the range of: A<the oil replenishing amount of the oil filling tool 21<2A.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure replenishing device for a female wet joint, characterized in that: It comprises a wet joint female head (2) placed in a vacuum tank body, an oil filling tool (21) for filling oil into the wet joint female head (2), and an oil replenishing tool (1) for replenishing oil into the wet joint female head (2); The wet connector female connector (2) comprises a fixing frame (4), an outer shell (3) is mounted on the fixing frame (4), a first through hole (12) communicating with the vacuum tank body is opened on the outer shell (3), an inner rubber sleeve (7) and an outer rubber sleeve (6) are arranged in the outer shell (3), the inner rubber sleeve (7) is mounted inside the outer rubber sleeve (6), and the inner rubber sleeve (7) and the outer rubber sleeve (6) are both fixed inside the outer shell (3); The oil injection tool (21) comprises an oil injection pin (5), wherein the oil injection pin (5) is inserted into the inner cavity of the inner rubber sleeve (7) and the inner cavity of the outer rubber sleeve (6), and an oil injection hole (13) communicating with the inner cavity of the inner rubber sleeve (7) and the inner cavity of the outer rubber sleeve (6) is respectively formed on the oil injection pin; The oil replenishing tool (1) has an oil replenishing pin (16), which is inserted into the inner cavity of the inner rubber sleeve (7), and an oil replenishing side hole (17) communicating with the inner cavity of the inner rubber sleeve (7) is opened on the oil replenishing pin; A piston assembly (8) is arranged in the inner rubber sleeve (7), and the piston assembly (8) abuts against the oil replenishing tooling (1); The piston assembly (8) comprises a first conductive copper core (9) located in the inner rubber sleeve (7) and a second conductive copper core (10) sleeved with the first conductive copper core (9), a piston rod (11) is arranged in the inner cavity of the first conductive copper core (9) and the second conductive copper core (10), the piston rod (11) is slidably connected in the first conductive copper core (9) along its central axis, a spring (20) is arranged at one end of the piston rod (11), one end of the spring (20) is connected to the piston rod (11), and the other end of the spring (20) is connected to the first conductive copper core (9), and the other end of the piston rod (11) abuts against a corresponding pin; A cavity for limiting the position of the second conductive copper core (10) is opened on the side of the first conductive copper core (9), and the cavity is located at the connection between the first conductive copper core (9) and the second conductive copper core (10); The end of the second conductive copper core (10) is inserted into the cavity of the first conductive copper core (9) and is clamped on the inner wall of the cavity.

2. A pressure replenishing device for a female wet joint according to claim 1, characterized in that: A plurality of inner rubber sleeves (7) are installed inside the outer rubber sleeve (6), and the plurality of inner rubber sleeves (7) are distributed at equal intervals along the circumferential direction.

3. A pressure replenishing device for a female wet joint according to claim 1, characterized in that: The oil replenishing tool (1) comprises a base platform, a sealing cavity (15) is provided in the base platform, an oil inlet hole (14) communicating with the sealing cavity (15) is provided on one side of the base platform, an oil replenishing pin (16) is provided on the other side of the base platform, the oil replenishing pin (16) has a through hole therein and communicates with the sealing cavity (15), and an oil replenishing side hole (17) is provided at the axial end of the oil replenishing pin (16).

4. A pressure replenishing device for a female wet joint according to claim 3, characterized in that: The base platform comprises a bottom plate (18) and a cover plate (19); a receiving groove for receiving oil is provided on the bottom plate (18); the receiving groove is located at the gap between the bottom plate (18) and the cover plate (19); and the bottom plate (18) and the cover plate (19) are fastened together.

5. A method for compensating pressure of a female wet joint, characterized in that: The steps of compensating the pressure of the vacuum tank by the pressure compensating device according to any one of claims 1 to 4 are as follows: Step 1: The wet joint female head (2) and the oil injection tool (21) are assembled together through a fixing frame (4), and the oil injection pin (5) of the oil injection tool (21) is inserted into the wet joint female head (2), and the oil injection pin (5) of the oil injection tool (21) is inserted into the inner and outer rubber sleeves (6), and the two oil injection holes (13) on the oil injection pin (5) are respectively located in the cavities of the inner and outer rubber sleeves (6); when the oil injection pin (5) is inserted into the wet joint female head (2), the oil injection pin (5) pushes the piston rod (11) to compress the spring (20) in the inner cavity of the conductive copper core; Step 2: The wet joint female head (2) and the oil injection tool (21) fixed together are placed in a vacuum tank, the vacuum tank extracts the internal air to form a vacuum cavity, and then the oil is injected into the internal space of the wet joint female head (2) through the oil injection hole (13) of the oil injection tool (21); and the oil is injected into the inner cavity of the inner rubber sleeve (7) and the inner cavity of the outer rubber sleeve (6) through the two oil injection holes (13) of the oil injection needle (5) respectively, until the inner cavity of the inner rubber sleeve (7), the inner cavity of the outer rubber sleeve (6) and the cavity of the vacuum tank are hydraulically consistent; Step 3: After the assembled wet connector female head (2) and the oil injection tool (21) are taken out of the vacuum tank as a whole, the oil injection tool (21) is taken out. When the oil injection tool (21) is pulled out, the spring (20) in the piston assembly (8) is reset to cause the piston rod (11) to pop out immediately when the oil injection tool (21) is pulled out, and the end of the piston rod (11) abuts against the through hole where the pin enters the cavity of the inner rubber sleeve (7) and seals the lip, completing the oil injection process; Step 4: The oil replenishing tool (1) is inserted into the wet joint female connector (2), and the oil replenishing pin (16) of the oil replenishing tool (1) passes through the inner cavity of the outer rubber sleeve (6) and enters the inner cavity of the inner rubber sleeve (7). The oil replenishing pin (16) is inserted into the inner cavity of the inner rubber sleeve (7) and pushes the piston rod (11) to compress the spring (20) in the inner cavity of the conductive copper core. After the oil replenishing tool (1) replenishes oil, the cavity hydraulic pressure of the inner rubber sleeve (7) is greater than the cavity hydraulic pressure of the outer rubber sleeve (6). Step 5: When the oil filling pin (16) of the oil filling tool (1) is pulled out of the cavity of the inner rubber sleeve (7), the spring (20) is reset to cause the piston rod (11) to pop out immediately when the oil filling tool (21) is pulled out, and the pin abutted at the end of the piston rod (11) enters the through hole of the cavity of the inner rubber sleeve (7) and seals the lip, completing the oil filling process.

6. A pressure replenishing method for a female wet joint according to claim 5, characterized in that: In step 4, the volume of the oil filling pin of the oil filling tool (1) inserted into the inner cavity of the rubber sleeve is A, and the oil filling amount range of the oil filling tool is: A<the oil filling amount of the oil filling tool<2A.

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