Underground cable penetrating joint

Abstract

The invention relates to the technical field of underground oil and gas pipe cable connectors, in particular to an underground cable penetrating connector which comprises an adapter, an adapter socket and a first connecting pipe, a second cable channel and a second liquid flow channel are formed in the adapter socket, and an outlet of the second cable channel is connected with a second cable sealing connector assembly; the adapter is provided with a first liquid flow channel, a first cable channel A, a first cable channel B and a third cable channel; after a third cable in the third cable channel is connected, motor oil is injected, and the third cable channel is kept sealed through the first cable sealing connector assembly A, the first cable sealing connector assembly B and the second cable sealing connector assembly. According to the invention, the power cable and the signal cable transferred into the annular space of the third cable channel can pass through the equipment to realize connection with an underground tool; the pressure is conducted through motor oil in the capsule pipe, so that the internal and external pressure difference is reduced, the normal work of the cable connecting part of the underground tool is ensured, and meanwhile, the insulativity of the cable in the capsule pipe is also ensured.

Description

Technical Field

[0001] The invention relates to the technical field of downhole oil and gas pipe cable joints, in particular to a downhole cable passing joint. Background Art

[0002] Coiled tubing is used for transportation in both oil and gas production operations. To facilitate control of underground equipment, cables connecting downhole tools are often laid. Installing cables within the coiled tubing can reduce damage. Cables installed within downhole coiled tubing are referred to as downhole continuous composite tubing cables.

[0003] Downhole continuous composite cable systems come in two configurations: the first uses an inner tube for fluid flow and an outer tube for cable passage; the second uses an inner tube for cable passage and an outer tube for fluid flow. Cables in this second configuration are less susceptible to mechanical damage due to the dual protection of the inner and outer tubes. Therefore, they are more widely used in downhole continuous composite cable systems to prevent downhole tool failure.

[0004] Currently, there are many types of downhole tools, each with a different installation location. Some can connect to cables from the inner tube, while others can only connect to cables from the outer tube, which necessitates conversion between the two aforementioned structures. For example, if the upper-level composite cable is of the second structure and equipped with downhole tools that connect to the inner tube cables, while the downhole tools of the current-level composite cable are distributed around the outer tube, it is necessary to guide the cables from the upper-level inner tube into the current-level outer tube, and to guide the fluid from the upper-level outer tube into the current-level inner tube, so that the downhole tools of the current level can connect to the cables.

[0005] At the same time, downhole continuous composite cable is used to power downhole tools. Because the cable remains sealed within the cable, once the well reaches a certain depth, the power cable is directly drawn from the continuous composite cable to connect to the downhole tool. This leads to high pressure differentials on the cable and the seals at the exit. Actual testing has shown that when the downhole pressure differential reaches 70 MPa, the small flat plugs of existing submersible electric pumps on the market cannot guarantee the normal operation of their power cables and seals under such high differential pressures. Summary of the Invention

[0006] In response to the problems pointed out in the background technology, the purpose of the present invention is to propose a downhole cable crossing joint, which can switch the cable originally located in the inner tube to the outer tube, and at the same time take pre-protection measures for the power cable to be led out, to ensure the insulation of the led-out cable and the sealing of the seals at the lead-out part, thereby providing effective technical support for the normal operation of downhole tools.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A downhole cable crossing joint includes an adapter, an adapter socket, and a first connecting pipe. The adapter socket has a second cable channel and a second liquid flow channel inside. The outlet of the second liquid flow channel is arranged in the middle of the rear end of the adapter socket, and the outlet of the second cable channel is arranged around the outside of the outlet of the second liquid flow channel. The outlet of the second cable channel is connected to a second cable sealing joint assembly; the front end of the adapter socket is connected to an upper-level composite pipe cable, and the inlet of the second liquid flow channel is connected to the outer pipe of the upper-level composite pipe cable, and the inlet of the second cable channel is connected to the inner pipe of the upper-level composite pipe cable; The adapter includes an outer protective tube, a capsule tube, a first inner tube and a first base. The first base has a first liquid flow channel, a first cable channel A and a first cable channel B inside. The rear end of the first base is connected to a valve. The front end of the first base is connected to the rear end of the first inner tube. The rear end of the first inner tube is connected to the inlet of the valve through the first liquid flow channel, and the front end of the first inner tube is connected to the outlet of the second liquid flow channel. The capsule tube is arranged outside the first inner tube, and a third cable channel is formed between the capsule tube and the first inner tube; The outer protective tube is arranged outside the capsule tube, and the tube wall of the outer protective tube is provided with a plurality of through holes A connected to the outside world; the rear ends of the capsule tube and the outer protective tube are respectively connected to the first base body, and the front ends of the capsule tube and the outer protective tube are respectively connected to the rear ends of the first connecting tube, and the rear end of the first connecting tube is connected to the rear end of the adapter socket; The outlet of the third cable channel is connected to the inlet of the first cable channel A and the inlet of the first cable channel B respectively, and the inlet of the third cable channel is connected to the second cable sealing joint assembly through the first connecting pipe; A second cable is provided in the second cable channel, a third cable is provided in the third cable channel, a first cable sealing joint assembly A for connecting a signal cable is provided in the first cable channel A, and a first cable sealing joint assembly B for connecting a power cable is provided in the first cable channel B; One end of the third cable is connected to the external output cable through the first cable sealing joint assembly A and the first cable sealing joint assembly B, and the other end of the third cable is connected to the second cable through the second cable sealing joint assembly. After the third cable in the third cable channel is connected, motor oil is injected, and the first cable sealing joint assembly A, the first cable sealing joint assembly B, and the second cable sealing joint assembly keep the third cable channel sealed.

[0008] The first substrate is composed of a front substrate, an intermediate substrate, and a rear substrate connected in sequence from front to back. The front substrate is a circular tubular structure. The front end of the front substrate lumen is connected to the first inner tube. The intermediate and rear substrates are provided with first connecting holes that penetrate the intermediate and rear substrates. The front substrate lumen and the first connecting holes are connected to form a first liquid flow channel. A second connecting hole A is provided inside the intermediate body, and a third connecting hole A is provided on the tube wall of the front base body. The second connecting hole A is connected to the third connecting hole A to form a first cable channel A; A second connecting hole B is further provided inside the intermediate body, and a third connecting hole B is provided on the tube wall of the front base body. The second connecting hole B is connected to the third connecting hole B to form a first cable channel B; The rear ends of the capsule tube and the outer protective tube are respectively connected to the front base.

[0009] The first cable sealing joint assembly A includes an outer cover, a five-core wire connection seat A and a five-core pin A; the outlet of the first cable channel is provided with a countersunk hole, the outer cover is arranged at the mouth of the countersunk hole, and the middle part of the outer cover has a through hole B; the lower end of the five-core wire connection seat A is inserted into the countersunk hole, and a sealing ring is provided between the outer wall of the five-core wire connection seat A and the inner wall of the countersunk hole; the upper end of the five-core wire connection seat A passes through the through hole B in the middle of the outer cover and is fixed in the countersunk hole by the outer cover; the lower end of the five-core pin A is inserted into the outlet of the cable channel, and the upper end is inserted into the inner hole of the five-core wire connection seat A, and a pressure ring is provided between the five-core pin A and the lower end surface of the five-core wire connection seat A.

[0010] The first cable sealing joint assembly B includes a four-core sealing plug for connecting power cables.

[0011] The adapter socket includes a second inner tube, a second base, a third inner tube and an outer sleeve. The second inner tube is arranged at the front end of the second base, and the second inner tube is connected to the inner tube of the upper composite cable. The front end of the second base is also connected to the outer tube of the upper composite cable. The front end of the outer sleeve is connected to the rear end of the second base; the third inner tube is arranged inside the outer sleeve, and the front end of the third inner tube is connected to the rear end of the second base, and the rear end of the third inner tube is connected to and communicates with the first inner tube; An annular cavity is provided between the outer sleeve and the third inner tube; A fourth connecting hole and a fifth connecting hole are provided inside the second base body; The inlet of the fifth connecting hole is arranged at the front end of the second base body and located outside the second inner tube. The outlet of the fifth connecting hole is connected to the third inner tube. The fifth connecting hole and the third inner tube form the second liquid flow channel. The inlet of the fourth connecting hole is arranged at the rear end of the second inner tube, and the outlet of the fourth connecting hole is arranged in the annular cavity between the outer sleeve and the third inner tube; the lumen of the second inner tube, the fourth connecting hole, and the annular cavity are connected in sequence to form the second cable channel; The front end of the second cable sealing joint assembly is arranged at the rear end of the annular cavity between the outer sleeve and the third inner tube, and the rear end of the second cable sealing joint assembly is arranged at the front end inside the first connecting tube.

[0012] The second cable sealing joint assembly consists of an annular pin seat, a five-core pin B and multiple single-core sealing plugs B. The inner hole of the annular pin seat is sleeved on the third inner tube, and a sealing member A is provided between the inner hole of the annular pin seat and the third inner tube; the outer cylindrical surface of the annular pin seat is inserted into the outer sleeve, and a sealing member B is provided between the outer cylindrical surface of the annular pin seat and the outer sleeve; the outer cylindrical surface of the annular pin seat is also fixedly connected to the outer sleeve by screws; the five-core pin B and multiple single-core sealing plugs B are evenly distributed on the end surface of the annular pin seat, and the five-core pin B and multiple single-core sealing plugs B all pass through the two end surfaces of the annular pin seat.

[0013] The inner hole of the annular pin seat is a two-stage stepped hole consisting of a first stepped hole and a second stepped hole. The first stepped hole is arranged at the front end of the second stepped hole, and the inner diameter of the first stepped hole is smaller than that of the second stepped hole. The first stepped hole is sleeved on the third inner tube, and the sealing member A is arranged between the first stepped hole and the third inner tube. A second connecting pipe is provided between the second step hole and the third inner pipe, and the third inner pipe is connected and communicated with the first inner pipe through the second connecting pipe.

[0014] The rear end of the second connecting tube is threadedly connected to the first inner tube, and the front end is threadedly connected to the third inner tube. The connecting threads at both ends of the second connecting tube have opposite rotation directions; a sealing member C is provided between the rear end of the second connecting tube and the first inner tube, and a sealing member D is provided between the front end of the second connecting tube and the third inner tube.

[0015] A sealing member E is provided between the front end of the outer sleeve and the second base, and the front end of the outer sleeve and the second base are connected by screws.

[0016] A third cable sealing joint assembly is provided in the second inner tube, and the third cable sealing joint assembly includes a disc-shaped pin seat, a five-core pin C and a plurality of single-core sealing plugs C. The disc-shaped pin seat is fixedly connected to the tube wall of the second inner tube, and the disc-shaped pin seat and the second inner tube are sealed by a seal F; the five-core pin C and the plurality of single-core sealing plugs C are evenly distributed on the end surface of the disc-shaped pin seat, and the five-core pin C and the plurality of single-core sealing plugs C all pass through the two end surfaces of the disc-shaped pin seat.

[0017] The present invention has the following beneficial effects: The middle and tail portions of the proposed downhole cable passage connector are adapters, enabling rapid optical and electrical connections. Power cables and signal cables transferred to the annular space of the third cable channel can be routed through the equipment to connect to downhole tools. The adapter ultimately maintains the flow of downhole fluids within the central channel while also ensuring a sealed, insulated connection and passage of the power and signal cables. The adapter's capsule tube design utilizes the soft nature of the capsule tube. The capsule tube is filled with insulating motor oil and then sealed. When pressure is applied to the outside of the capsule tube, the tube's volume is compressed, and pressure is transmitted through the motor oil within the capsule tube, reducing the internal and external pressure differential and balancing the pressure. This ensures the proper operation of downhole tool cable connections (e.g., the small flat plug of a submersible pump) while also ensuring the insulation of the cables within the capsule tube. The outlet of the third cable channel is connected to the power cable exit interface and the signal cable exit interface, respectively, enabling connection to downhole tools that require external plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the main view of the overall structure of the present invention.

[0019] Figure 2 It is a right side view of the overall structure of the present invention.

[0020] Figure 3 for Figure 2 AA cross-sectional view.

[0021] Figure 4 for Figure 3 Enlarged view of part B.

[0022] Figure 5 for Figure 3 Enlarged view of part C.

[0023] Figure 6 It is a three-dimensional schematic diagram of the present invention.

[0024] Figure 7 It is a three-dimensional schematic diagram of the present invention after removing the outer protective tube.

[0025] Figure 8 This is a three-dimensional schematic diagram of the adapter after removing the outer protective tube and capsule tube.

[0026] Figure 9 It is a three-dimensional cross-sectional view of the adapter after removing the outer protective tube and capsule tube.

[0027] Figure 10 This is a three-dimensional cross-sectional view of the adapter in another cutting direction after removing the outer protective tube and capsule tube.

[0028] Figure 11 It is a three-dimensional assembly diagram of the adapter socket and the second cable sealing connector assembly.

[0029] Figure 12 It is the rear end face of the adapter socket and the second cable sealing connector assembly.

[0030] Figure 13 This is the main view of the adapter socket.

[0031] Figure 14 It is a three-dimensional schematic diagram of the first cable sealing joint assembly A.

[0032] In the figure: 1- adapter, 2- adapter socket, 3- first connecting pipe, 4- second connecting pipe, 5- oil filling hole; 11-outer protective tube, 12-capsule tube, 13-first inner tube, 14-first base, 15-valve, 16-first cable sealing joint assembly A, 17-outer cover, 18-five-core wire connector A, 19-five-core pin A, 20-pressure ring; 141 - front base, 142 - middle base, 143 - rear base, 144 - first connecting hole, 145 - second connecting hole A, 146 - third connecting hole A, 147 - second connecting hole B, 148 - third connecting hole B; 21 - second cable sealing joint assembly, 22 - second inner tube, 23 - third inner tube, 24 - second base, 25 - outer sleeve, 26 - annular cavity, 27 - cable sealing joint assembly; 211-ring pin seat, 212-five-core pin B, 213-single-core sealing plug B; 243-fourth connecting hole, 244-fifth connecting hole; 271-disc-shaped pin seat, 272-five-core pin C, 273-single-core sealing plug C. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0034] like Figure 1-14 As shown, the present invention provides a downhole cable crossing joint, including an adapter 1, an adapter socket 2 and a first connecting pipe 3. The adapter socket 2 has a second cable channel and a second liquid flow channel inside. The outlet of the second liquid flow channel is arranged in the middle of the rear end of the adapter socket 2, and the outlet of the second cable channel is arranged around the outside of the outlet of the second liquid flow channel. The outlet of the second cable channel is connected to a second cable sealing joint assembly 21; the front end of the adapter socket 2 is connected to the upper composite pipe cable, and the inlet of the second liquid flow channel is connected to the outer pipe of the upper composite pipe cable, and the inlet of the second cable channel is connected to the inner pipe of the upper composite pipe cable; The adapter 1 includes an outer protective tube 11, a capsule tube 12, a first inner tube 13, and a first base 14. The first base 14 has a first liquid flow channel, a first cable channel A, and a first cable channel B. The rear end of the first base 14 is connected to a valve 15. The front end of the first base 14 is connected to the rear end of the first inner tube 13. The rear end of the first inner tube 13 is connected to the inlet of the valve 15 through the first liquid flow channel, and the front end of the first inner tube 13 is connected to the outlet of the second liquid flow channel. The capsule tube 12 is arranged outside the first inner tube 13, and a third cable channel is formed between the capsule tube 12 and the first inner tube 13; The outer protective tube 11 is disposed outside the capsule tube 12. The outer protective tube 11 has a plurality of through-holes A in the tube wall that communicate with the outside world. The rear ends of the capsule tube 12 and the outer protective tube 11 are respectively connected to the first base 14. The front ends of the capsule tube 12 and the outer protective tube 11 are respectively connected to the rear ends of the first connecting tube 3. The rear end of the first connecting tube 3 is connected to the rear end of the adapter socket 2. The capsule tube 12 is a flexible tube that can withstand high pressure. The two ends of the capsule tube 12 are respectively connected to the first base 14 and the first connecting tube 3 by a pipe clamp. The outlet of the third cable channel is connected to the inlet of the first cable channel A and the inlet of the first cable channel B respectively, and the inlet of the third cable channel is connected to the second cable sealing joint assembly 21 through the first connecting pipe 3; A second cable is provided in the second cable channel, a third cable is provided in the third cable channel, a first cable sealing joint assembly A16 for connecting a signal cable is provided in the first cable channel A, and a first cable sealing joint assembly B (not shown) for connecting a power cable is provided in the first cable channel B. The second and third cables are hybrid cables consisting of a signal cable and a power cable, and are output separately from adapter 1. One end of the third cable is connected to the external output cable through the first cable sealing joint assembly A16 and the first cable sealing joint assembly B, and the other end of the third cable is connected to the second cable through the second cable sealing joint assembly 21. After the third cable in the third cable channel is connected, motor oil is injected, and the first cable sealing joint assembly A16, the first cable sealing joint assembly B and the second cable sealing joint assembly 21 keep the third cable channel sealed.

[0035] Specifically, in one embodiment of the present invention, the first connecting tube 3 is provided with an oiling hole 5 for injecting oil into the third cable channel. The oiling hole 5 communicates with the third cable channel through the lumen of the first connecting tube 3 and is sealed after oil injection. Of course, the oiling hole 5 can also be located on the first base 14, as long as the oiling hole 5 communicates with the third cable channel and is easily sealed.

[0036] The problems solved by the present invention mainly include the following two aspects: First, guide the cable in the inner tube of the upper composite cable into the second cable channel, the third cable channel (the third cable channel is equivalent to the outer tube lumen of the upper composite cable), and finally into the downhole fluid environment. Simultaneously, the downhole fluid is introduced into the central channel of the adapter 1 (i.e., the first liquid flow channel and the first inner tube 13) for circulation, and then guided into the outer tube of the upper composite cable through the adapter socket 2. 2. When the cables in the composite pipe and cable are led out to the underground high-voltage differential fluid environment, the seal at the terminal cable joint is easily damaged due to the high voltage differential. Under the high voltage differential, the sealing insulation of the power cable itself will also be affected, and the high-voltage fluid will invade the insulation layer. Even if there is circuit protection, the high-voltage fluid will still invade the composite pipe and cable step by step, causing long-range faults in the power cable inside the composite pipe and cable. The present invention injects non-conductive motor oil into the capsule tube and adaptively boosts the closed environment of the power cable in advance, which can reduce the risk of damage to the seal at the cable joint, and at the same time resist the invasion of conductive fluid underground into the power cable, thereby improving the protective performance of the composite pipe and cable.

[0037] The first base 14 is composed of a front base 141, an intermediate body 142, and a rear base 143 connected in sequence from front to back. The front base 141 is a circular tubular structure. The front end of the tubular cavity of the front base 141 is connected to the first inner tube 13. The intermediate body 142 and the rear base 143 are provided with a first connecting hole 144 that passes through the intermediate body 142 and the rear base 143. The tubular cavity of the front base 141 and the first connecting hole 144 are connected to form a first liquid flow channel. A second connection hole A145 is provided inside the intermediate body 142, and a third connection hole A146 is provided on the wall of the front base body 141. The second connection hole A145 is connected to the third connection hole A146 to form a first cable channel A. A second connection hole B147 is further provided inside the intermediate body 142, and a third connection hole B148 is provided on the wall of the front base body 141. The second connection hole B147 is connected to the third connection hole B148 to form a first cable channel B. The rear ends of the capsule tube 12 and the outer protective tube 11 are connected to the front base 141 respectively.

[0038] The first cable sealing joint assembly A16 includes an outer cover 17, a five-core wire connector A18, and a five-core pin A19. The outlet of the first cable channel is provided with a countersunk hole, and the outer cover 17 is positioned at the mouth of the countersunk hole. A through-hole B is provided in the middle of the outer cover 17. The lower end of the five-core wire connector A18 is inserted into the countersunk hole, and a sealing ring is provided between the outer wall of the five-core wire connector A18 and the inner wall of the countersunk hole. The upper end of the five-core wire connector A18 passes through the through-hole B in the middle of the outer cover 17 and is secured in the countersunk hole by the outer cover 17. The lower end of the five-core pin A19 is inserted into the outlet of the cable channel, and the upper end is inserted into the inner hole of the five-core wire connector A18. A pressure ring 20 is provided between the five-core pin A19 and the lower end surface of the five-core wire connector A18. Specifically, the five-core pin A19 is a commercially available electrical connector, also known as a five-core sealing plug, which is primarily adapted for connecting signal lines.

[0039] The first cable gland assembly B includes a four-core sealing plug (not shown) for connecting the power cable. The mounting structure of the first cable gland assembly B can refer to the first cable gland assembly A16 described above, but other forms are also possible. A four-core sealing plug is also a commercially available electrical connector; however, a three-core sealing plug could also be used.

[0040] The adapter socket 2 includes a second inner tube 22, a second base 24, a third inner tube 23 and an outer sleeve 25. The second inner tube 22 is arranged at the front end of the second base 24, and the second inner tube 22 is connected to the inner tube of the upper composite cable. The front end of the second base 24 is also connected to the outer tube of the upper composite cable. The front end of the outer sleeve 25 is connected to the rear end of the second base 24; the third inner tube 23 is arranged inside the outer sleeve 25, and the front end of the third inner tube 23 is connected to the rear end of the second base 24, and the rear end of the third inner tube 23 is connected to and communicates with the first inner tube 13; An annular cavity 26 is provided between the outer sleeve 25 and the third inner tube 23. The annular cavity 26 is mainly used to reserve space for wiring. A fourth connecting hole 243 and a fifth connecting hole 244 are provided inside the second base body 24; The inlet of the fifth connecting hole 244 is arranged at the front end of the second base body 24 and located outside the second inner tube 22. The outlet of the fifth connecting hole 244 is connected to the third inner tube 23. The fifth connecting hole 244 and the third inner tube 23 form the second liquid flow channel. The inlet of the fourth connecting hole 243 is arranged at the rear end of the second inner tube 22, and the outlet of the fourth connecting hole 243 is arranged in the annular cavity 26 between the outer sleeve 25 and the third inner tube 23; the lumen of the second inner tube 22, the fourth connecting hole 243, and the annular cavity 26 are connected in sequence to form the second cable channel; The front end of the second cable sealing joint assembly 21 is arranged at the rear end of the annular cavity 26 between the outer sleeve 25 and the third inner tube 23 , and the rear end of the second cable sealing joint assembly 21 is arranged at the front end inside the first connecting tube 3 .

[0041] The second cable sealing joint assembly 21 consists of an annular pin seat 211, a five-core pin B212 and a plurality of single-core sealing plugs B213. The inner hole of the annular pin seat 211 is sleeved on the third inner tube 23, and a sealing member A is provided between the inner hole of the annular pin seat 211 and the third inner tube 23; the outer cylindrical surface of the annular pin seat 211 is inserted into the outer sleeve 25, and a sealing member B is provided between the outer cylindrical surface of the annular pin seat 211 and the outer sleeve 25; the outer cylindrical surface of the annular pin seat 211 is also fixedly connected to the outer sleeve 25 by screws; the five-core pin B212 and the plurality of single-core sealing plugs B213 are evenly distributed on the end surface of the annular pin seat 211, and the five-core pin B212 and the plurality of single-core sealing plugs B213 all pass through the two end surfaces of the annular pin seat 211.

[0042] The inner hole of the annular pin seat 211 is a two-stage stepped hole consisting of a first stepped hole and a second stepped hole. The first stepped hole is arranged at the front end of the second stepped hole, and the inner diameter of the first stepped hole is smaller than that of the second stepped hole. The first stepped hole is sleeved on the third inner tube 23, and the sealing member A is arranged between the first stepped hole and the third inner tube 23. A second connecting pipe 4 is provided between the second stepped hole and the third inner pipe 23 , and the third inner pipe 23 is connected and communicated with the first inner pipe 13 through the second connecting pipe 4 .

[0043] The rear end of the second connecting tube 4 is threadedly connected to the first inner tube 13, and the front end is threadedly connected to the third inner tube 23. The connection threads at both ends of the second connecting tube 4 are rotated in opposite directions; a seal C is provided between the rear end of the second connecting tube 4 and the first inner tube 13, and a seal D is provided between the front end of the second connecting tube 4 and the third inner tube 23.

[0044] A sealing member E is provided between the front end of the outer sleeve 25 and the second base 24 , and the front end of the outer sleeve 25 and the second base 24 are connected by screws.

[0045] A third cable sealing joint assembly 27 is provided in the second inner tube 22. The third cable sealing joint assembly 27 includes a disc-shaped pin seat 271, a five-core pin C272 and a plurality of single-core sealing plugs C273. The disc-shaped pin seat 271 is fixedly connected to the tube wall of the second inner tube 22, and the disc-shaped pin seat 271 and the second inner tube 22 are sealed by a seal F; the five-core pin C272 and the plurality of single-core sealing plugs C273 are evenly distributed on the end surface of the disc-shaped pin seat 271, and the five-core pin C272 and the plurality of single-core sealing plugs C273 all pass through the two end surfaces of the disc-shaped pin seat 271.

[0046] In the present invention, the capsule tube 12 is a flexible insulating tube, the first connecting tube 3, the second connecting tube 4, the outer protective tube 11, the first inner tube 13, the first base 14, the second inner tube 22, the second base 24, the third inner tube 23 and the outer sleeve 25 are all made of metal. The annular pin seat 211 is also made of metal, and the disc-shaped pin seat 271 is made of PEEK material.

[0047] The parts not described in detail in this invention are prior art.

Claims

1. A downhole cable passing joint, comprising an adapter (1), an adapter socket (2) and a first connecting pipe (3), characterized in that: The adapter socket (2) has a second cable channel and a second liquid flow channel inside, the outlet of the second liquid flow channel is arranged in the middle of the rear end of the adapter socket (2), the outlet of the second cable channel is arranged around the outside of the outlet of the second liquid flow channel, and the outlet of the second cable channel is connected to a second cable sealing joint assembly (21); the front end of the adapter socket (2) is connected to the upper composite pipe cable, and the inlet of the second liquid flow channel is connected to the outer pipe of the upper composite pipe cable, and the inlet of the second cable channel is connected to the inner pipe of the upper composite pipe cable; The adapter (1) comprises an outer protective tube (11), a capsule tube (12), a first inner tube (13) and a first base (14); the first base (14) has a first liquid flow channel, a first cable channel A and a first cable channel B inside; the rear end of the first base (14) is connected to a valve (15); the front end of the first base (14) is connected to the rear end of the first inner tube (13); the rear end of the first inner tube (13) is connected to the inlet of the valve (15) through the first liquid flow channel, and the front end of the first inner tube (13) is connected to the outlet of the second liquid flow channel; The capsule tube (12) is arranged outside the first inner tube (13), and a third cable channel is formed between the capsule tube (12) and the first inner tube (13); The outer protective tube (11) is arranged outside the capsule tube (12), and the tube wall of the outer protective tube (11) is provided with a plurality of through holes A communicating with the outside world; the rear ends of the capsule tube (12) and the outer protective tube (11) are respectively connected to the first base body (14), and the front ends of the capsule tube (12) and the outer protective tube (11) are respectively connected to the rear end of the first connecting tube (3), and the rear end of the first connecting tube (3) is connected to the rear end of the adapter socket (2); The outlet of the third cable channel is connected to the inlet of the first cable channel A and the inlet of the first cable channel B respectively, and the inlet of the third cable channel is connected to the second cable sealing joint assembly (21) through the first connecting pipe (3); A second cable is provided in the second cable channel, a third cable is provided in the third cable channel, a first cable sealing joint assembly A (16) for connecting a signal cable is provided in the first cable channel A, and a first cable sealing joint assembly B for connecting a power cable is provided in the first cable channel B; One end of the third cable is connected to the external output cable through the first cable sealing joint assembly A (16) and the first cable sealing joint assembly B, and the other end of the third cable is connected to the second cable through the second cable sealing joint assembly (21); After the third cable in the third cable channel is connected, motor oil is injected, and the first cable sealing joint assembly A (16), the first cable sealing joint assembly B and the second cable sealing joint assembly (21) keep the third cable channel sealed.

2. The downhole cable passing joint according to claim 1, characterized in that: The first base (14) is composed of a front base (141), an intermediate body (142), and a rear base (143) connected in sequence from front to back. The front base (141) is a circular tubular structure as a whole. The front end of the tube cavity of the front base (141) is connected to the first inner tube (13). The intermediate body (142) and the rear base (143) are provided with a first connecting hole (144) that penetrates the intermediate body (142) and the rear base (143). The tube cavity of the front base (141) and the first connecting hole (144) are connected to form a first liquid flow channel. A second connecting hole A (145) is provided inside the intermediate body (142), a third connecting hole A (146) is provided on the tube wall of the front base body (141), and the second connecting hole A (145) is connected to the third connecting hole A (146) to form a first cable channel A; A second connecting hole B (147) is further provided inside the intermediate body (142), and a third connecting hole B (148) is provided on the tube wall of the front base body (141). The second connecting hole B (147) is connected to the third connecting hole B (148) to form a first cable channel B; The rear ends of the capsule tube (12) and the outer protective tube (11) are respectively connected to the front base (141).

3. The downhole cable passing joint according to claim 1, characterized in that: The first cable sealing joint assembly A (16) comprises an outer cover (17), a five-core wire connection seat A (18) and a five-core plug pin A (19); the outlet of the first cable channel is provided with a countersunk hole, the outer cover (17) is arranged at the mouth of the countersunk hole, and the middle of the outer cover (17) has a through hole B; the lower end of the five-core wire connection seat A (18) is inserted into the countersunk hole, and a sealing ring is provided between the outer wall of the five-core wire connection seat A (18) and the inner wall of the countersunk hole; the upper end of the five-core wire connection seat A (18) passes through the through hole B in the middle of the outer cover (17) and is fixed in the countersunk hole by the outer cover (17); the lower end of the five-core plug pin A (19) is inserted into the outlet of the cable channel, and the upper end is inserted into the inner hole of the five-core wire connection seat A (18), and a pressure ring (20) is provided between the five-core plug pin A (19) and the lower end surface of the five-core wire connection seat A (18).

4. The downhole cable passing joint according to claim 1, characterized in that: The first cable sealing joint assembly B includes a four-core sealing plug for connecting power cables.

5. The downhole cable passing joint according to claim 1, characterized in that: The adapter socket (2) comprises a second inner tube (22), a second base (24), a third inner tube (23) and an outer sleeve (25); the second inner tube (22) is arranged at the front end of the second base (24), and the second inner tube (22) is connected to the inner tube of the upper composite cable; the front end of the second base (24) is also connected to the outer tube of the upper composite cable; The front end of the outer sleeve (25) is connected to the rear end of the second base body (24); the third inner tube (23) is arranged inside the outer sleeve (25), and the front end of the third inner tube (23) is connected to the rear end of the second base body (24), and the rear end of the third inner tube (23) is connected to and communicates with the first inner tube (13); An annular cavity (26) is provided between the outer sleeve (25) and the third inner tube (23); A fourth connecting hole (243) and a fifth connecting hole (244) are provided inside the second base body (24); The inlet of the fifth connecting hole (244) is arranged at the front end of the second base body (24) and is located outside the second inner tube (22). The outlet of the fifth connecting hole (244) is connected to the third inner tube (23). The fifth connecting hole (244) and the third inner tube (23) form the second liquid flow channel. The inlet of the fourth connecting hole (243) is arranged at the rear end of the second inner tube (22), and the outlet of the fourth connecting hole (243) is arranged in the annular cavity (26) between the outer sleeve (25) and the third inner tube (23); the lumen of the second inner tube (22), the fourth connecting hole (243), and the annular cavity (26) are sequentially connected to form the second cable channel; The front end of the second cable sealing joint assembly (21) is arranged at the rear end of the annular cavity (26) between the outer sleeve (25) and the third inner tube (23), and the rear end of the second cable sealing joint assembly (21) is arranged at the front end inside the first connecting tube (3).

6. The downhole cable passing joint according to claim 5, characterized in that: The second cable sealing joint assembly (21) consists of an annular pin seat (211), a five-core pin B (212) and a plurality of single-core sealing plugs B (213). The inner hole of the annular pin seat (211) is sleeved on the third inner tube (23), and a sealing member A is provided between the inner hole of the annular pin seat (211) and the third inner tube (23); the outer circular surface of the annular pin seat (211) is inserted into the outer sleeve (25), and a sealing member B is provided between the outer circular surface of the annular pin seat (211) and the outer sleeve (25); the outer circular surface of the annular pin seat (211) is also fixedly connected to the outer sleeve (25) by screws; the five-core pin B (212) and the plurality of single-core sealing plugs B (213) are uniformly distributed on the end surface of the annular pin seat (211), and the five-core pin B (212) and the plurality of single-core sealing plugs B (213) all pass through the two end surfaces of the annular pin seat (211).

7. The downhole cable passing joint according to claim 6, characterized in that: The inner hole of the annular pin seat (211) is a secondary step hole consisting of a first step hole and a second step hole, the first step hole is arranged at the front end of the second step hole, and the inner diameter of the first step hole is smaller than that of the second step hole, the first step hole is sleeved on the third inner tube (23), and the sealing member A is arranged between the first step hole and the third inner tube (23); A second connecting pipe (4) is provided between the second step hole and the third inner pipe (23), and the third inner pipe (23) is connected and communicated with the first inner pipe (13) via the second connecting pipe (4).

8. The downhole cable passing joint according to claim 7, characterized in that: The rear end of the second connecting tube (4) is threadedly connected to the first inner tube (13), and the front end is threadedly connected to the third inner tube (23), and the connecting threads at both ends of the second connecting tube (4) are screwed in opposite directions; a sealing member C is provided between the rear end of the second connecting tube (4) and the first inner tube (13), and a sealing member D is provided between the front end of the second connecting tube (4) and the third inner tube (23).

9. The downhole cable passing joint according to claim 5, characterized in that: A sealing member E is provided between the front end of the outer sleeve (25) and the second base (24), and the front end of the outer sleeve (25) and the second base (24) are connected via screws.

10. The downhole cable passing joint according to claim 5, characterized in that: A third cable sealing joint assembly (27) is provided in the second inner tube (22), and the third cable sealing joint assembly (27) comprises a disc-shaped pin seat (271), a five-core pin C (272) and a plurality of single-core sealing plugs C (273). The disc-shaped pin seat (271) is fixedly connected to the tube wall of the second inner tube (22), and the disc-shaped pin seat (271) and the second inner tube (22) are sealed by a sealing member F; the five-core pin C (272) and the plurality of single-core sealing plugs C (273) are uniformly distributed on the end surface of the disc-shaped pin seat (271), and the five-core pin C (272) and the plurality of single-core sealing plugs C (273) all pass through both end surfaces of the disc-shaped pin seat (271).

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