Split-type downhole power cable pass-through device

Abstract

This invention relates to the field of downhole power cable installation technology, and more particularly to a split-type downhole power cable pass-through device, aiming to solve the problems of unsatisfactory sealing performance and poor reliability in existing technologies. The invention includes an upper tube body, a first sealing structure, and a lower tube body; the lower part of the upper tube body is fitted onto the upper part of the lower tube body, and the first sealing structure is inserted into the lower part of the upper tube body; the lower end face of the first sealing structure abuts against the upper end of the lower tube body; the first sealing structure includes an annular sleeve and filler material filled within the annular sleeve; after the upper tube body moves downward, it compresses the first sealing structure, reducing the inner diameter of the first sealing structure and thus pressing the power cable tightly. In this invention, the downward movement of the upper tube body compresses the first sealing structure against the upper end of the lower tube body, reducing the inner diameter of the first sealing structure, thereby ensuring a tight seal between the outer side of the power cable passing through the first sealing structure and the first sealing structure, achieving a seal, and improving the reliability of the seal under mechanical compression.

Description

Technical Field

[0001] This invention relates to the field of underground power cable installation technology, and in particular to a split-type underground power cable crossing device. Background Technology

[0002] In oil extraction operations, the use of cable-guided wellheads has become a common choice in the oil extraction industry. Due to its high production capacity and extraction efficiency, it has gradually gained industry recognition. Currently, cable-guided wellheads generally use integral flange connections. These integral flanges require bolt holes for mates with the wellhead four-way flange and cable-guided installation holes for mates with the cable-guided hanger. The cable-guided wellheads need to be characterized by rapid installation, good safety, high sealing performance, stable performance, and convenient operation. However, the sealing performance of existing cable-guided wellhead structures is not ideal, especially after a period of use, due to corrosion from petroleum and other liquid products, leading to a weakening of the sealing effect. Summary of the Invention

[0003] The purpose of this invention is to provide a split-type downhole power cable pass-through device to solve the problems of unsatisfactory sealing performance and poor reliability in the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0005] A split-type downhole power cable pass-through device includes an upper pipe body, a first sealing structure, and a lower pipe body; the lower part of the upper pipe body is fitted onto the upper part of the lower pipe body; the first sealing structure is inserted into the lower part of the upper pipe body; the lower end face of the first sealing structure abuts against the upper end of the lower pipe body.

[0006] The first sealing structure includes an annular sleeve and filler material inside the annular sleeve; after the upper tube moves down, it squeezes the first sealing structure, making the inner diameter of the first sealing structure smaller and then pressing the power supply cable passing through the first sealing structure.

[0007] Furthermore, the upper tube body includes a thin straight tube, a transition section connected to the lower end of the thin straight tube, and a flared tube connected to the lower end of the transition section; the diameter of the flared tube is larger than the diameter of the thin straight tube; the flared tube is fitted onto the upper part of the lower tube body, and the first sealing structure is inserted into the flared tube; after the upper tube body moves down, the transition section squeezes the upper end face of the first sealing structure.

[0008] Furthermore, the lower pipe body includes a thick straight pipe and an outer edge ring connected to the upper end of the thick straight pipe. The outer diameter of the outer edge ring is larger than the outer diameter of the thick straight pipe, and the outer edge ring is inserted into the flared pipe. The lower end face of the first sealing structure contacts the upper end face of the outer edge ring. The lower end of the flared pipe is connected to an inner edge ring, the inner diameter of which is smaller than the inner diameter of the flared pipe and smaller than the outer diameter of the outer edge ring. The inner edge ring and the outer edge ring cooperate to prevent the upper pipe body from separating from the lower pipe body.

[0009] Furthermore, the lower end of the thick straight tube is provided with a bottom flange.

[0010] Furthermore, the split-type downhole power cable passer also includes a second sealing structure inserted into the upper side of the thin straight pipe. The second sealing structure includes a conical ring and a blocking ring fitted under the lower part of the conical ring. An upper ring plate is provided at the upper end of the conical ring, which extends laterally outward from the upper edge of the conical ring, and its outer diameter is smaller than the inner diameter of the thin straight pipe. The upper ring plate protrudes from the upper end of the thin straight pipe in the initial state. A longitudinal gap is provided along the side wall of the conical ring, with the lower end of the gap being open and the upper end being closed, dividing the lower side of the conical ring into multiple pieces. The blocking ring is disposed between the conical ring and the thin straight pipe and is fixedly connected to the inner side of the thin straight pipe. The inner diameter of the blocking ring is smaller than the maximum outer diameter of the conical ring.

[0011] Furthermore, the conical ring is provided with multiple gap openings, which are evenly distributed in a ring shape.

[0012] Furthermore, the second sealing structure also includes a sealing ring, which is disposed between the conical ring and the thin straight tube, and the sealing ring is located between the blocking ring and the upper ring plate.

[0013] Furthermore, the split-type downhole power cable passer also includes a fixed outer sleeve and a movable inner sleeve inserted into the fixed outer sleeve; the fixed outer sleeve is provided with internal threads, the movable inner sleeve is provided with external threads, and the fixed outer sleeve and the movable inner sleeve are screwed together; the lower end face of the movable inner sleeve is aligned with the upper end face of the upper ring plate and the thin straight tube, and after the movable inner sleeve moves down, it abuts against the upper end face of the upper ring plate and the thin straight tube.

[0014] Furthermore, the split-type downhole power cable passer also includes a tubing structure with stepped holes; the lower tube is inserted into the stepped holes, and the bottom flange abuts against the stepped surface of the stepped holes; the lower end of the fixing sleeve abuts against the upper end of the tubing structure, and the fixing sleeve is fixedly connected to the tubing structure.

[0015] Furthermore, a stepped notch is provided at the upper end of the stepped hole, and an arc-shaped step block is provided inside the stepped notch; a strip-shaped protrusion is provided on the outer side of the upper part of the thin straight tube, and the strip-shaped protrusion cooperates with the arc-shaped step block to restrict the rotation of the thin straight tube.

[0016] In summary, the technical effects achieved by this invention are as follows:

[0017] The present invention provides a split-type downhole power cable pass-through device, comprising an upper tube body, a first sealing structure, and a lower tube body; the lower part of the upper tube body is fitted onto the upper part of the lower tube body, and the first sealing structure is inserted into the lower part of the upper tube body; the lower end face of the first sealing structure abuts against the upper end of the lower tube body; the first sealing structure includes an annular sleeve and filler material filled in the annular sleeve; after the upper tube body moves down, it squeezes the first sealing structure, thereby reducing the inner diameter of the first sealing structure and pressing the power cable.

[0018] Because the upper pipe of the split-type downhole power supply cable passing device provided by the present invention moves down and squeezes the upper end of the lower pipe to compress the first sealing structure, the inner diameter of the first sealing structure becomes smaller, so that the outer side of the power supply cable passing through the first sealing structure is tightly fitted with the first sealing structure, thereby achieving a seal and improving the reliability of the seal under the action of mechanical compression. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the split-type downhole power supply cable tunneling device provided in an embodiment of the present invention;

[0021] Figure 2 A perspective view of the main structure of the split-type downhole power supply cable tunneling device provided in an embodiment of the present invention;

[0022] Figure 3 A cross-sectional view of the main structure of the split-type downhole power cable crossing device provided in an embodiment of the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 for Figure 1 A structural diagram of the fixed outer sleeve 500 and the movable inner sleeve 600;

[0025] Figure 6 This is a schematic diagram of the 700mm tubing structure.

[0026] Icons: 100-Upper pipe body; 200-First sealing structure; 300-Lower pipe body; 400-Second sealing structure; 500-Fixed outer sleeve; 600-Modible inner sleeve; 700-Oil pipe structure; 800-Arc-shaped stepped block; 110-Thin straight pipe; 120-Transition section; 130-Flanged pipe; 140-Inner edge ring; 150-Strip-shaped protrusion; 210-Annular sleeve; 220-Filling material; 230-Connecting rubber block; 310-Thick straight pipe; 320-Outer edge ring; 330-Bottom flange; 410-Conical ring; 420-Blocking ring; 430-Upper ring plate; 440-Gap opening; 450-Sealing ring; 510-Outer sleeve; 520-Connecting flange; 610-Inner sleeve; 620-Annular hexagonal block; 710-Stepped hole; 720-Stepped notch; 711-Stepped surface. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] Existing power cable crossing devices suffer from poor sealing performance and low reliability.

[0035] In view of this, the present invention provides a split-type downhole power cable pass-through device, including an upper tube 100, a first sealing structure 200, and a lower tube 300; the lower part of the upper tube 100 is fitted onto the upper part of the lower tube 300, and the first sealing structure 200 is inserted into the lower part of the upper tube 100; the lower end face of the first sealing structure 200 abuts against the upper end of the lower tube 300; the first sealing structure 200 includes an annular sleeve 210 and a filler 220 filled in the annular sleeve 210; after the upper tube 100 moves down, it squeezes the first sealing structure 200, thereby reducing the inner diameter of the first sealing structure 200 and compressing the power cable.

[0036] As the upper pipe 100 of the split-type downhole power supply cable passer provided by the present invention moves down and squeezes the upper end of the lower pipe 300 against the first sealing structure 200, the inner diameter of the first sealing structure 200 becomes smaller, thereby making the outer side of the power supply cable passing through the first sealing structure 200 fit tightly against the first sealing structure 200, achieving a seal, and improving the reliability of the seal under the action of mechanical compression.

[0037] The following is in conjunction with the appendix Figure 1-6 The structure and shape of the split-type downhole power cable tunneling device provided in this embodiment are described in detail below:

[0038] In this embodiment, the upper tube 100 includes a thin straight tube 110, a transition section 120 connected to the lower end of the thin straight tube 110, a flared tube 130 connected to the lower end of the transition section 120, and an inner edge ring 140 disposed at the lower end of the flared tube 130; the lower tube 300 includes a thick straight tube 310 and an outer edge ring 320 connected to the upper end of the thick straight tube 310.

[0039] like Figure 3 As shown, the diameter of the flared tube 130 is larger than the diameter of the thin straight tube 110, and the outer diameter of the outer ring 320 is larger than the outer diameter of the thick straight tube 310. The flared tube 130 is fitted onto the upper part of the lower tube body 300. The inner diameter of the inner ring 140 is smaller than the inner diameter of the flared tube 130 and smaller than the outer diameter of the outer ring 320. The inner ring 140 and the outer ring 320 cooperate to prevent the upper tube body 100 from separating from the lower tube body 300.

[0040] Furthermore, the first sealing structure 200 is inserted into the flared tube 130 and the lower end face of the first sealing structure 200 contacts the upper end face of the outer ring 320; after the upper tube 100 moves down, the first sealing structure 200 is deformed by the compression of the transition section 120, the flared tube 130 and the outer ring 320, which presses the power supply cable passing through the first sealing structure 200 and fits tightly with the transition section 120 to achieve a seal.

[0041] In an optional embodiment, a connecting block 230 is provided at the lower end of the first sealing structure 200. The first sealing structure 200 is connected to the outer edge ring 320 through the connecting block 230 to fix the position of the first sealing structure 200 and prevent the first sealing structure 200 from shifting.

[0042] In an optional embodiment, the lower end of the thick straight tube 310 is provided with a bottom flange 330 to improve the strength of the bottom and prevent the bottom from deforming under pressure.

[0043] In an optional embodiment, the split-type downhole power cable passer also includes a second sealing structure 400 inserted into the upper side of the thin straight pipe 110, such as... Figure 2 , 3 As shown in Figure 4, the second sealing structure 400 includes a conical ring 410, a blocking ring 420 fitted at the lower part of the conical ring 410, and an upper ring plate 430 disposed at the upper end of the conical ring 410.

[0044] The blocking ring 420 is disposed between the conical ring 410 and the thin straight tube 110 and is fixedly connected to the inner side of the thin straight tube 110. The inner diameter of the blocking ring 420 is smaller than the maximum outer diameter of the conical ring 410.

[0045] The upper ring plate 430 extends laterally outward from the upper edge of the conical ring 410, and its outer diameter is smaller than the inner diameter of the thin straight tube 110; the upper ring plate 430 protrudes from the upper end of the thin straight tube 110 in the initial state; a longitudinal gap 440 is provided along the side wall of the conical ring 410, with the lower end of the gap 440 open and the upper end of the gap 440 closed.

[0046] Furthermore, the conical ring 410 is provided with multiple annularly distributed gaps 440, which divide the lower end of the conical ring 410 into multiple pieces.

[0047] Furthermore, the second sealing structure 400 also includes a sealing ring 450, which is disposed between the conical ring 410 and the thin straight tube 110, and is located between the blocking ring 420 and the upper ring plate 430. When the upper ring plate 430 is compressed, the conical ring 410 moves downward, and the upper ring plate 430 changes from protruding from the upper end of the thin straight tube 110 to being inserted into the upper end of the thin straight tube 110. At the same time, the blocking ring 420 squeezes the conical ring 410, causing the gap 440 to close, thereby reducing the diameter of the lower end of the cone and pressing the power supply cable passing through the second sealing structure 400 to achieve a seal. At the same time, the annular space formed by the upper ring plate 430, the conical ring 410, the blocking ring 420, and the thin straight tube 110 becomes smaller, squeezing the sealing ring 450. The sealing ring 450 deforms and fits tightly against the outer side of the conical ring 410 and the inner side of the thin straight tube 110, improving the sealing performance.

[0048] In an optional embodiment, the split-type downhole power cable passer also includes a fixed outer sleeve 500 and a movable inner sleeve 600 inserted into the fixed outer sleeve 500. For example... Figure 1 , 5 As shown, the fixed outer sleeve 500 has an internal thread, and the movable inner sleeve 600 has an external thread. The fixed outer sleeve 500 and the movable inner sleeve 600 are screwed together. The lower end face of the movable inner sleeve 600 is aligned with the upper end face of the upper ring plate 430 and the thin straight tube 110. After the movable inner sleeve 600 moves down, it abuts against the upper end face of the upper ring plate 430 and the thin straight tube 110, and pushes the conical ring 410 and the upper tube body 100 down to achieve a seal.

[0049] Furthermore, the movable inner sleeve 600 includes an inner sleeve 610 and an annular hexagonal block 620 disposed on the upper end of the inner sleeve 610. The inner sleeve 610 is provided with external threads and is screwed to the fixed outer sleeve 500. The annular hexagonal block 620 is hexagonal on the outside, which facilitates clamping with tools when rotating the movable outer sleeve. Optionally, the annular hexagonal block 620 can be set as a milled flat ring, that is, two parallel straight edges are machined on the outside of the ring for easy clamping.

[0050] Furthermore, the fixed outer sleeve 500 includes an outer sleeve 510 and a connecting flange 520 disposed at the lower end of the outer sleeve 510. The outer sleeve 510 is provided with internal threads and is screwed to the inner sleeve 610; the connecting flange 520 is used to fix the fixed outer sleeve 500 to the equipment.

[0051] Furthermore, the split-type downhole power cable passer also includes a tubing structure 700, with the lower end face of the connecting flange 520 connected to the upper end face of the tubing structure 700 by bolts. For example... Figure 1 , 6As shown, the oil pipe structure 700 has a stepped hole 710. The larger diameter hole of the stepped hole 710 is on the top, and the lower pipe body 300 is inserted into the larger diameter hole of the stepped hole 710. The bottom flange 330 abuts against the stepped surface 711 of the stepped hole 710. After the movable inner sleeve 600 moves down to push the upper pipe body 100 and squeeze the first sealing structure 200, it further presses the lower pipe body 300, so that the bottom flange 330 abuts against the side wall of the stepped hole 710 after being pressed, thus playing a certain sealing role.

[0052] Furthermore, a stepped notch 720 is provided at the upper end of the stepped hole 710, and the stepped notch 720 is provided on the side wall of the stepped hole 710. For example... Figure 1 , 6 As shown, an arc-shaped step block 800 is provided within the stepped notch 720; as Figure 2 As shown, a strip-shaped protrusion 150 is provided on the outer side of the upper part of the thin straight tube 110. The strip-shaped protrusion 150 cooperates with the arc-shaped step block 800 to restrict the rotation of the thin straight tube 110. When it is necessary to rotate the thin straight tube 110, the arc-shaped step block 800 can be removed.

[0053] The working process of the split-type downhole power cable tunneling device provided in this embodiment is as follows:

[0054] The assembled upper pipe body 100, first sealing structure 200 and lower pipe body 300 are installed into the stepped hole 710 of the oil pipe structure 700, and then the fixed outer sleeve 500 is installed. After the connection is tightened with bolts, the movable inner sleeve 600 is screwed in.

[0055] The power cable is then inserted, and the movable inner sleeve 600 is rotated to move it downwards. The lower end of the movable inner sleeve 600 presses against the upper ring plate 430 and contacts the upper end of the thin straight tube 110. The movable inner sleeve 600 is then rotated further, causing the conical ring 410 to move downwards. The lower end of the conical ring 410 is pressed by the blocking ring 420, reducing the gap 440 and bringing the lower end of the conical ring 410 into close contact with the power cable. Simultaneously, the sealing ring 450 is compressed, filling the space between the conical ring 410 and the thin straight tube 110, thus improving the sealing performance between them.

[0056] Simultaneously, the movable inner sleeve 600 presses downwards against the upper tube 100, causing the upper tube 100 and lower tube 300 to press against the first sealing structure 200. After being deformed by the force, the first sealing structure 200 adheres tightly to the inner wall of the power supply cable and the flared tube 130, achieving a seal. The mechanical compression of the movable inner sleeve 600 makes the sealing effect more reliable, and the multiple sealing reduces the impact of seal failure.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A split-type downhole power supply cable pass-through device, characterized in that, It includes an upper pipe body (100), a first sealing structure (200), and a lower pipe body (300); The lower part of the upper tube (100) is fitted onto the upper part of the lower tube (300); The first sealing structure (200) is inserted into the lower part of the upper tube body (100); The lower end face of the first sealing structure (200) abuts against the upper end of the lower tube body (300); The first sealing structure (200) includes an annular sleeve (210) and a filler (220) filled in the annular sleeve (210). After the upper tube (100) moves down, it squeezes the first sealing structure (200), making the inner diameter of the first sealing structure (200) smaller and pressing the power supply cable passing through the first sealing structure (200); The lower tube body (300) includes a thick straight tube (310), and the lower end of the thick straight tube (310) is provided with a bottom flange (330); the upper tube body (100) includes a thin straight tube (110). It also includes a second sealing structure (400) inserted into the upper side of the thin straight tube (110), the second sealing structure (400) including a conical ring (410) and a blocking ring (420) fitted into the lower part of the conical ring (410); The upper end of the conical ring (410) is provided with an upper ring plate (430), which extends laterally outward from the upper edge of the conical ring (410) and has an outer diameter smaller than the inner diameter of the thin straight tube (110). The upper ring plate (430) protrudes from the upper end of the thin straight tube (110) in the initial state; A longitudinal gap (440) is provided along the side wall of the conical ring (410). The lower end of the gap (440) is open and the upper end of the gap (440) is closed. The gap (440) divides the lower side of the conical ring (410) into multiple pieces. The blocking ring (420) is disposed between the conical ring (410) and the thin straight tube (110) and is fixedly connected to the inner side of the thin straight tube (110). The inner diameter of the blocking ring (420) is smaller than the maximum outer diameter of the conical ring (410). The second sealing structure (400) further includes a sealing ring (450), which is disposed between the conical ring (410) and the thin straight tube (110), and the sealing ring (450) is located between the blocking ring (420) and the upper ring plate (430).

2. The split-type downhole power supply cable pass-through device according to claim 1, characterized in that, The upper tube (100) also includes a transition section (120) connected to the lower end of the thin straight tube (110) and a flared tube (130) connected to the lower end of the transition section (120). The diameter of the flared tube (130) is larger than the diameter of the thin straight tube (110); The flared tube (130) is fitted onto the upper part of the lower tube body (300), and the first sealing structure (200) is inserted into the flared tube (130). After the upper tube (100) moves downward, the transition section (120) squeezes the upper end face of the first sealing structure (200).

3. The split-type downhole power supply cable pass-through device according to claim 2, characterized in that... The lower tube body (300) also includes an outer edge ring (320) connected to the upper end of the thick straight tube (310). The outer diameter of the outer edge ring (320) is larger than the outer diameter of the thick straight tube (310). The outer edge ring (320) is inserted into the flared tube (130). The lower end face of the first sealing structure (200) is in contact with the upper end face of the outer edge ring (320); The lower end of the flared tube (130) is connected to an inner edge ring (140), the inner diameter of which is smaller than the inner diameter of the flared tube (130) and smaller than the outer diameter of the outer edge ring (320). The inner edge ring (140) cooperates with the outer edge ring (320) to prevent the upper tube body (100) from separating from the lower tube body (300).

4. The split-type downhole power supply cable pass-through device according to claim 3, characterized in that, The conical ring (410) is provided with a plurality of gap openings (440), which are evenly distributed in a ring.

5. The split-type downhole power supply cable pass-through device according to claim 4, characterized in that... It also includes a fixed outer sleeve (500) and a movable inner sleeve (600) inserted into the fixed outer sleeve (500); The fixed outer sleeve (500) is provided with an internal thread, the movable inner sleeve (600) is provided with an external thread, and the fixed outer sleeve (500) and the movable inner sleeve (600) are screwed together; The lower end face of the movable inner sleeve (600) is aligned with the upper end face of the upper ring plate (430) and the thin straight tube (110). After the movable inner sleeve (600) moves down, it abuts against the upper end face of the upper ring plate (430) and the thin straight tube (110).

6. The split-type downhole power supply cable pass-through device according to claim 5, characterized in that, It also includes an oil pipe structure (700) having a stepped hole (710); The lower tube (300) is inserted into the stepped hole (710), and the bottom flange (330) abuts against the stepped surface (711) of the stepped hole (710). The lower end of the fixed sleeve (500) abuts against the upper end of the oil pipe structure (700), and the fixed sleeve (500) is fixedly connected to the oil pipe structure (700).

7. The split-type downhole power supply cable pass-through device according to claim 6, characterized in that, The upper end of the stepped hole (710) is provided with a stepped notch (720), and an arc-shaped step block (800) is provided inside the stepped notch (720). A strip-shaped protrusion (150) is provided on the outer side of the upper part of the thin straight tube (110). The strip-shaped protrusion (150) cooperates with the arc-shaped step block (800) to restrict the rotation of the thin straight tube (110).

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