Underground wireless energy transfer communication wet butt joint tool for oil field cabled layered oil extraction

Abstract

The invention provides an underground wireless energy transfer communication wet butt joint tool for oil field cabled layered oil extraction, and relates to the technical field of oil field layered oil extraction, the tool comprises a male joint assembly and a female joint assembly, the male joint assembly comprises a male joint sleeve, and the female joint assembly comprises a female joint sleeve; a first sealing cavity and a second sealing cavity are formed in the outer wall of the male joint sleeve, and a third sealing cavity and a fourth sealing cavity are formed in the inner wall of the female joint sleeve; pressure balance pistons are arranged in the first sealing cavity and the third sealing cavity in a sliding manner; energy transfer communication coils are mounted in the second sealing cavity and the fourth sealing cavity; one end of the first sealing cavity is communicated with the second sealing cavity through hydraulic oil, one end of the third sealing cavity is communicated with the fourth sealing cavity through hydraulic oil, and communicated pressure balance holes are formed in cavities at the other ends of the first sealing cavity and the fourth sealing cavity. The pressure difference between the inside and outside of the second sealing cavity and the fourth sealing cavity is balanced through hydraulic oil and the pressure balance piston, and the safety of the coil and the pressure resistance of the coil protection sleeve are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield separate layer oil production, in particular to a downhole wireless energy transmission communication wet docking tool for cable-type separate layer oil production in oilfields. BACKGROUND

[0002] In the technical field of oilfield separate layer oil production, two methods of cable-type and hydraulic control separate layer control development are usually adopted. Among them, the cable-type separate layer oil production scheme can realize real-time monitoring and dynamic control of downhole parameters, and is currently widely applied in offshore oilfields.

[0003] The cable-type separate layer oil production process is to place an integrated cable-type intelligent working barrel in the well for a long time, and to realize data monitoring and flow control of multiple layers in the well by using one cable, so as to realize online real-time control and data acquisition. However, in the application process, the cable-type intelligent working barrel and the electric pump are lowered into the well by one trip of the pipe column. Once the electric pump fails or needs to be repaired, the whole pipe column needs to be pulled out, which is a large amount of work and is easy to cause damage to the cable-type intelligent working barrel in the well, thereby increasing the operation time and the operation cost.

[0004] Therefore, there is an urgent need for a downhole wireless energy transmission communication wet docking tool for cable-type separate layer oil production in oilfields to solve the above technical problems. SUMMARY

[0005] The present application aims to provide a downhole wireless energy transmission communication wet docking tool for cable-type separate layer oil production in oilfields to solve the technical problems of long operation cycle and high repair cost of the whole pump repair operation caused by the need to pull out the whole pipe column for repair of the electric pump system in the existing cable-type separate layer oil production process in offshore oilfields. The preferred technical solutions in the many technical solutions provided by the present application can produce many technical effects, which are described in detail below.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: The downhole wireless energy transmission communication wet docking tool for cable-type separate layer oil production in oilfields provided by the present application comprises a male connector assembly and a female connector assembly, the male connector assembly comprises a male connector sleeve, and the female connector assembly comprises a female connector sleeve, wherein: A first sealing cavity and a second sealing cavity are arranged on the outer wall of the male connector sleeve, and a third sealing cavity and a fourth sealing cavity are arranged on the inner wall of the female connector sleeve; A pressure balance piston is slidably arranged in each of the first sealing cavity and the third sealing cavity, and an energy transmission communication coil is installed in each of the second sealing cavity and the fourth sealing cavity; Hydraulic oil is arranged in one end of the first sealing cavity, and the first sealing cavity is in communication with the second sealing cavity through a first threading hole, and a first pressure balance hole in communication with the outer wall is formed in the other end of the first sealing cavity; The third sealing cavity is provided with hydraulic oil in one end of the cavity, and is communicated with the fourth sealing cavity through a flow hole. When the male connector assembly is sleeved with the female connector assembly, the two energy transmission communication coils are opposite and coupled, and when the annular pressure changes underground, the pressure balance piston slides along the corresponding sealing cavity, and the pressure is transmitted through the hydraulic oil to balance the internal and external pressure difference of the second sealing cavity and the fourth sealing cavity.

[0007] Preferably, a first ring table is arranged on the outer wall of the male connector sleeve, and a claw sleeve is mounted on the outer wall of the first ring table. A plurality of limiting claws are arranged on the lower end of the claw sleeve in an annular array, and a hand-off piston sleeve for supporting the limiting claws is arranged between the claw sleeve and the male connector sleeve. A first piston cavity is formed between the upper end of the hand-off piston sleeve and the lower end of the first ring table, and the first piston cavity is communicated with the inner cavity of the male connector sleeve through a pressing hole.

[0008] Preferably, a limiter is further mounted on the outer wall of the male connector sleeve. The limiter is fixed to the lower part of the outer wall of the male connector sleeve and is located below the hand-off piston sleeve, and is used to abut against the lower end of the hand-off piston sleeve to limit the downward sliding stroke thereof.

[0009] Preferably, a female connector upper sleeve is connected to the upper end of the female connector sleeve, and a limiting ring groove is arranged on the inner wall of the female connector upper sleeve and matched with the limiting claw.

[0010] Preferably, a male connector upper sleeve is connected to the upper end of the male connector sleeve, and a female connector lower sleeve is connected to the lower end of the female connector sleeve. A first ring groove is arranged on the male connector upper sleeve and the female connector lower sleeve, and an electric control system module is mounted in the first ring groove. A first sealing sleeve and a second sealing sleeve are sleeved on the outer side of the first ring groove, the first sealing sleeve and the second sealing sleeve are sealingly connected with the outer wall of the male connector upper sleeve or the female connector lower sleeve, and the first sealing sleeve is located between the male connector upper sleeve and the second sealing sleeve.

[0011] Preferably, a cable connector and a cable sealing plug are arranged at the two ends of the male connector upper sleeve and the female connector lower sleeve, respectively. A second threading hole is arranged on the male connector upper sleeve and the female connector lower sleeve, and is communicated with the first ring groove, the cable connector and the cable sealing plug, and the electric control system module is connected with the cable connector and the cable sealing plug through a soft wire, respectively.

[0012] Preferably, the cable connector is connected with an external steel pipe cable. The first threading hole is communicated with a cable sealing plug of the male connector assembly and a second sealing cavity; A third threading hole is formed in the female connector sleeve and communicated with a cable sealing plug of the female connector assembly and a fourth sealing cavity; The cable sealing plug is connected with the electric control system module through a flexible wire.

[0013] Preferably, a lower end of the male connector sleeve is connected with a male sealing sleeve, and an annular sealing module is mounted on an outer wall of the male sealing sleeve. A sealing surface matched with the annular sealing module is arranged on an inner wall of the female connector sleeve, and the annular sealing module is sealingly attached to the sealing surface when the male connector assembly is sleeved with the female connector assembly.

[0014] Preferably, the outer wall of the second sealing cavity and the inner wall of the fourth sealing cavity are made of a material that is not magnetically conductive and not electrically conductive.

[0015] The downhole wireless energy transmission communication wet mating tool for cable layered oil extraction in an oil field provided by the application is provided with a male connector assembly including a male connector sleeve and a female connector assembly including a female connector sleeve, a first sealing cavity and a second sealing cavity are arranged on an outer wall of the male connector sleeve, and a third sealing cavity and a fourth sealing cavity are arranged on an inner wall of the female connector sleeve; energy transmission communication coils are mounted in the second sealing cavity and the fourth sealing cavity, pressure balance pistons are arranged in the first sealing cavity and the third sealing cavity, and when the pressure in the annular cavity between the male connector assembly and the female connector assembly changes, the pressure difference between the inside and outside of the second sealing cavity and the fourth sealing cavity is balanced by hydraulic oil, thereby improving the safety of the energy transmission communication coils and the pressure resistance and service life of the coil protection sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0017] Figure 1 is a structural schematic view of the male connector assembly of the application; Figure 2 is a structural schematic view of the female connector assembly of the application; Figure 3 is a partial schematic view of the male connector assembly and the female connector assembly in an assembled state; Figure 4 is a partial schematic view of the male connector assembly and the female connector assembly in a disassembled state.

[0018] In the figure: 1, male joint sleeve; 2, female joint sleeve; 3, first sealing cavity; 4, second sealing cavity; 5, third sealing cavity; 6, fourth sealing cavity; 7, pressure balance piston; 8, energy transmission communication coil; 9, first threading hole; 10, first pressure balance hole; 11, liquid flow hole; 12, second pressure balance hole; 13, first ring table; 14, clamping sleeve; 15, limiting clamping jaw; 16, hand removal piston sleeve; 17, first piston cavity; 18, pressing hole; 19, limiter; 20, female joint upper sleeve; 21, limiting ring groove; 22, male joint upper sleeve; 23, female joint lower sleeve; 24, first ring groove; 25, electric control system module; 26, first sealing sleeve; 27, second sealing sleeve; 28, cable connector; 29, cable sealing plug; 30, second threading hole; 31, male joint sealing sleeve; 32, annular sealing module; 33, first piston sleeve; 34, first coil protection sleeve; 35, second piston sleeve; 36, second coil protection sleeve; 37, third threading hole; 38, unsealing pin. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0020] In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] In the description of the present application, it should be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] As Figure 1 And Figure 2The embodiment shown provides a downhole wireless energy transmission communication wet mating tool for cable layered oil extraction in an oil field.

[0023] The male connector assembly comprises a male connector sleeve 1, a male upper sleeve 22 and a male sealing sleeve 31 connected in sequence.

[0024] The female connector assembly comprises a female upper sleeve 20, a female connector sleeve 2 and a female lower sleeve 23 connected in sequence.

[0025] In the embodiment, the male connector assembly is provided with flowing well fluid in the middle, and the male connector assembly is inserted into the female connector assembly when the male connector assembly and the female connector assembly are installed.

[0026] Specifically, the outer wall of the male connector sleeve 1 is provided with a first sealing cavity 3 and a second sealing cavity 4, and the inner wall of the female connector sleeve 2 is provided with a third sealing cavity 5 and a fourth sealing cavity 6.

[0027] The first sealing cavity 3 is provided with hydraulic oil in one end of the cavity, and is communicated with the second sealing cavity 4 through a first threading hole 9.

[0028] When the male connector assembly and the female connector assembly are sleeved, the two energy transmission communication coils 8 are opposite to each other, and when the annulus pressure changes underground, the pressure balance piston 7 slides along the corresponding sealing cavity.

[0029] The oilfield has a cable layer oil extraction downhole wireless transmission communication wet docking tool, which is provided with a transmission communication coil 8 in the second sealing cavity 4 and the fourth sealing cavity 6, and a pressure balance piston 7 is arranged in the first sealing cavity 3 and the third sealing cavity 5. When the pressure in the annular cavity between the male joint assembly and the female joint assembly changes, the pressure difference between the inside and outside of the second sealing cavity 4 and the fourth sealing cavity 6 is balanced by the hydraulic oil, thereby improving the safety of the transmission communication coil 8 and the pressure resistance and service life of the coil protection sleeve.

[0030] As an optional embodiment, the first piston sleeve 33 is sleeved between the outer wall of the male joint sleeve 1 and the outer wall of the male joint sleeve 22, the first sealing cavity 3 is formed between the first piston sleeve 33 and the outer wall of the male joint sleeve 1, the first coil protection sleeve 34 is sleeved between the male joint sleeve 1 and the male joint sealing sleeve 31, and the second sealing cavity 4 is formed between the first coil protection sleeve 34 and the outer wall of the male joint sleeve 1. The second piston sleeve 35 is arranged in sealing between the inner wall of the female joint sleeve 20 and the female joint sleeve 2, the third sealing cavity 5 is formed between the second piston sleeve 35 and the inner wall of the female joint sleeve 2, the second coil protection sleeve 36 is arranged in sealing between the female joint sleeve 2 and the inner wall of the second piston sleeve 35, and the fourth sealing cavity 6 is formed between the second coil protection sleeve 36 and the inner wall of the female joint sleeve 2.

[0031] As an optional embodiment, the outer wall of the second sealing cavity 4 and the inner wall of the fourth sealing cavity 6 are made of PEEK material which is not magnetically conductive and not electrically conductive, so as to improve the coupling performance of the transmission communication coil and avoid the interference of the environmental magnetic field.

[0032] As shown in Figure 1 and Figure 3 , the first ring table 13 is arranged on the outer wall of the male joint sleeve 1, and the claw sleeve 14 is arranged on the outer wall of the first ring table 13.

[0033] The lower end of the claw sleeve 14 is provided with a plurality of limiting claws 15 in an annular array, and the claw sleeve 14 and the male joint sleeve 1 are slidably provided with a hand-off piston sleeve 16 for supporting the limiting claws 15. The first piston cavity 17 is formed between the upper end of the hand-off piston sleeve 16 and the lower end of the first ring table 13, and the first piston cavity 17 is communicated with the inner cavity of the male joint sleeve 1 through the pressing hole 18.

[0034] The outer wall of the male joint sleeve 1 in the embodiment is also provided with a limiter 19, the limiter 19 is fixed to the lower part of the outer wall of the male joint sleeve 1 and located below the hand-off piston sleeve 16, and is used for abutting against the lower end of the hand-off piston sleeve 16 to limit the downward sliding stroke of the hand-off piston sleeve 16.

[0035] As shown in Figure 2 and Figure 3 , the inner wall of the female joint sleeve 20 is provided with a limiting ring groove 21 matched with the limiting claws 15.

[0036] In this embodiment, the disengagement piston sleeve 16 is fixedly connected to the outer wall of the male connector sleeve 1 through the annular array of the disengagement pins 38. The outer wall of the lower end of the limiting clamping jaw 15 and the outer wall of the lower end of the disengagement piston sleeve 16 are both provided with protrusions, and the protrusion of the disengagement piston sleeve 16 is in sliding contact with the inner wall of the limiting clamping jaw 15. As shown in Figure 3 , in the normal assembly state, the protrusion at the bottom end of the limiting clamping jaw 15 is clamped in the limiting ring groove 21, and the protrusion at the bottom end of the disengagement piston sleeve 16 abuts against the inner wall of the limiting clamping jaw 15, thereby realizing the connection of the male connector assembly and the female connector assembly. During running-in, a one-trip string can be used for running-in, and real-time monitoring of data during running-in can be realized. After running-in is completed, the central pipe is pressed, the high-pressure drilling fluid passes through the pressing hole 18 and enters the left cavity of the first piston cavity 17, the high-pressure drilling fluid pushes the disengagement piston sleeve 16 to move to the right to cut off the disengagement pin 38, until the lower end of the disengagement piston sleeve 16 abuts against the limiter 19, as shown in Figure 4 , at this time, the limiting clamping jaw 15 is not supported, and when the male connector assembly is pulled up, the limiting clamping jaw 15 is inwardly retracted, and the male connector assembly and the female connector assembly are disengaged.

[0037] In this embodiment, the number of limiting clamping jaws 15 is six, and the six limiting clamping jaws 15 are arranged in an annular array. After pump inspection is completed, the male connector assembly is reinserted into position, the limiting clamping jaw 15 is re-cooperated with the limiting ring groove 21, and the butt joint of the string is realized.

[0038] This oilfield has a downhole wireless transmission communication wet butt joint tool for layered oil production with a cable. During pump inspection, the male connector assembly and the female connector assembly can be disengaged by pressing, the lower string is avoided from being pulled out during pump starting, the pump inspection efficiency is improved, and the pump inspection cost is reduced. After the male and female connector assemblies are re-butted, the mechanical claw can realize a large butt joint force, the male and female connector assemblies are prevented from being disengaged, the problem that the mechanical elastic lock claw locking and disengagement mechanism in the prior art cannot realize high-reliability butt joint is solved, and the stability of the overall system after butt joint is improved.

[0039] As shown in Figures 1-3 , the male upper sleeve 22 and the female lower sleeve 23 are both provided with a first ring groove 24, and an electric control system module 25 is installed in the first ring groove 24; a first sealing sleeve 26 and a second sealing sleeve 27 are stacked outside the first ring groove 24, the first sealing sleeve 26 and the second sealing sleeve 27 are both in sealing connection with the outer wall of the male upper sleeve 22 or the female lower sleeve 23, and the first sealing sleeve 26 is located between the male upper sleeve 22 and the second sealing sleeve 27.

[0040] Specifically, cable connectors 28 and cable sealing plugs 29 are respectively provided at both ends of the male upper sleeve 22 and the female lower sleeve 23; a second wire hole 30 connecting the first annular groove 24 and the cable connectors 28 and cable sealing plugs 29 is provided on both the male upper sleeve 22 and the female lower sleeve 23; the electrical control system module 25 is connected to the cable connectors 28 and cable sealing plugs 29 respectively through flexible wires.

[0041] In this embodiment, the cable connector 28 is connected to an external steel pipe cable; the first through hole 9 connects to the cable sealing plug 29 of the male connector assembly and the second sealing cavity 4; the female connector sleeve 2 is provided with a third through hole 37 connecting the cable sealing plug 29 of the female connector assembly and the fourth sealing cavity 6; the cable sealing plug 29 is connected to the electrical control system module 25 through a flexible wire.

[0042] The electronic control system module 25 includes a signal encoder, a signal decoder, a data processing unit, and a communication module. The electronic control system module 25 performs signal encoding and decoding, and connects to the cable sealing plug 29 via a flexible cable to achieve pressure isolation. Simultaneously, the cable sealing plug 29 connects to the energy transmission communication coil 8 via a pressure-resistant flexible cable, transmitting ground controller commands processed by the electronic control system module 25 to the energy transmission communication coil 8, thus realizing signal and energy transmission.

[0043] In this embodiment, the cable connector 28 of the male connector assembly is connected to the external steel pipe cable from the surface. The cable connector 28 of the female connector assembly is connected to the external steel pipe cable, and the signals and energy are transmitted to the downhole working casing through the steel pipe cable to realize the power supply, real-time signal reading and control of the downhole working casing.

[0044] To achieve overall sealing of the central tube structure, an annular sealing module 32 is installed and its sealing surface inside the female connector is fitted together. Through the overall sealing of the central tube male connector assembly and the female connector assembly, the central channel is sealed, ensuring the isolation between the central tube pressure and the annular pressure, and providing a guarantee for operations such as packer setting that require central tube pressure testing.

[0045] like Figure 1 and Figure 2 As shown, in this embodiment, the lower end of the male connector sleeve 1 is connected to a male sealing sleeve 31, and an annular sealing module 32 is installed on the outer wall of the male sealing sleeve 31; the inner wall of the female connector sleeve 2 is provided with a sealing surface that cooperates with the annular sealing module 32. When the male connector assembly and the female connector assembly are fitted together, the annular sealing module 32 is sealed and fitted with the sealing surface.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wet docking tool for downhole wireless power transmission communication in cabled stratified oil production in oilfields, comprising a male connector assembly and a female connector assembly, characterized in that, The male connector assembly includes a male connector sleeve (1), and the female connector assembly includes a female connector sleeve (2), wherein: The male connector sleeve (1) has a first sealing cavity (3) and a second sealing cavity (4) on its outer wall, and the female connector sleeve (2) has a third sealing cavity (5) and a fourth sealing cavity (6) on its inner wall. Pressure balancing pistons (7) are slidably installed in the first sealing cavity (3) and the third sealing cavity (5), and energy transmission communication coils (8) are installed in the second sealing cavity (4) and the fourth sealing cavity (6). Hydraulic oil is provided in one end of the first sealing cavity (3) and it is connected to the second sealing cavity (4) through the first thread hole (9). The other end of the first sealing cavity (3) is provided with a first pressure balance hole (10) that is connected to the outer wall. Hydraulic oil is provided in one end of the third sealing cavity (5) and is connected to the fourth sealing cavity (6) through the flow hole (11). A second pressure balance hole (12) is provided in the other end of the third sealing cavity (5) and is connected to the inner wall. When the male connector assembly and the female connector assembly are fitted together, the two energy transmission communication coils (8) are coupled to each other. When the downhole annulus pressure changes, the pressure balancing piston (7) slides along the corresponding sealing cavity and transmits pressure through hydraulic oil to balance the internal and external pressure difference of the second sealing cavity (4) and the fourth sealing cavity (6).

2. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to claim 1, characterized in that, The male connector sleeve (1) has a first annular platform (13) on its outer wall, and a claw sleeve (14) is installed on the outer wall of the first annular platform (13), wherein: The lower end of the claw sleeve (14) is provided with a plurality of limiting claws (15) in a circular array, and a release piston sleeve (16) for supporting the limiting claws (15) is slidably provided between the claw sleeve (14) and the male connector sleeve (1). The upper end of the release piston sleeve (16) and the lower end of the first ring platform (13) form a first piston chamber (17), and the first piston chamber (17) is connected to the inner cavity of the male connector sleeve (1) through the pressure hole (18).

3. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to claim 2, characterized in that: A limiter (19) is also installed on the outer wall of the male connector sleeve (1), wherein: The limiter (19) is fixed to the lower part of the outer wall of the male connector sleeve (1) and located below the release piston sleeve (16), and is used to abut the lower end of the release piston sleeve (16) to limit its downward sliding stroke.

4. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to claim 2, characterized in that: The upper end of the female connector sleeve (2) is connected to the female connector upper sleeve (20), and the inner wall of the female connector upper sleeve (20) is provided with a limiting ring groove (21) that engages with the limiting claw (15).

5. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to any one of claims 1-4, characterized in that: The upper end of the male connector sleeve (1) is connected to the male upper sleeve (22), and the lower end of the female connector sleeve (2) is connected to the female lower sleeve (23). Both the male upper sleeve (22) and the female lower sleeve (23) are provided with a first annular groove (24), and an electrical control system module (25) is installed in the first annular groove (24). A first sealing sleeve (26) and a second sealing sleeve (27) are stacked on the outside of the first annular groove (24). The first sealing sleeve (26) and the second sealing sleeve (27) are both sealed to the outer wall of the male upper sleeve (22) or the female lower sleeve (23), and the first sealing sleeve (26) is located between the male upper sleeve (22) and the second sealing sleeve (27).

6. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to claim 5, characterized in that: The male upper sleeve (22) and the female lower sleeve (23) are respectively provided with cable connectors (28) and cable sealing plugs (29). The male upper sleeve (22) and the female lower sleeve (23) are each provided with a second wire hole (30) that connects the first annular groove (24) and the cable connector (28) and the cable sealing plug (29). The electrical control system module (25) is connected to the cable connector (28) and the cable sealing plug (29) respectively via a flexible wire.

7. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to claim 6, characterized in that: The cable connector (28) is connected to the external steel pipe cable; The first through hole (9) connects to the cable sealing plug (29) of the male connector assembly and the second sealing cavity (4). The female connector sleeve (2) is provided with a third through hole (37) for the cable sealing plug (29) and the fourth sealing cavity (6) that connect the female connector assembly. The cable sealing plug (29) is connected to the electrical control system module (25) via a flexible wire.

8. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to any one of claims 1-4, characterized in that: The lower end of the male connector sleeve (1) is connected to a male sealing sleeve (31), and an annular sealing module (32) is installed on the outer wall of the male sealing sleeve (31). The inner wall of the female connector sleeve (2) is provided with a sealing surface that cooperates with the annular sealing module (32). When the male connector assembly and the female connector assembly are fitted together, the annular sealing module (32) and the sealing surface are sealed and fitted together.

9. The downhole wireless power transmission and wet docking tool for cabled stratified oil production in oilfields according to any one of claims 1-4, characterized in that: The outer wall of the second sealing cavity (4) and the inner wall of the fourth sealing cavity (6) are both made of non-magnetic and non-conductive materials.

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