Flexible weak cable connector for well logging perforation

Abstract

The invention discloses a flexible weak point cable connector for well logging perforation, which comprises a connector lower joint, a shell, a fishing head, an adapter, a connector upper joint and a connecting body which are connected in sequence and are all of a revolving body structure, a copper conducting rod, a compression spring, a copper connecting rod and a sealing plug-in which are connected in sequence are arranged in the connector lower joint in the direction from the position away from the shell to the position close to the shell, and the other end of the sealing plug-in extends out of the connector lower joint, is located in the shell and is connected with a copper threaded sleeve in a sleeved mode through threads. One end, deviating from the connector lower joint, of the weakness lower joint is sequentially connected with a weakness and a weakness upper joint, the weakness upper joint is fixed in the connector upper joint, and the weakness is formed by cold pressing of a steel wire. The problems that in the prior art, due to manual operation and extrusion, armored steel wires are not evenly dispersed, and a copper taper sleeve is not evenly stressed, errors at weak points are large, and construction potential safety hazards are likely to be caused are solved.

Description

Technical Field

[0001] This invention belongs to the field of cable connector technology and relates to a flexible, weak cable connector for well logging perforation. Background Technology

[0002] Chinese patent CN2602161Y discloses a connection device for downhole instruments and test cables. It is assembled from a housing assembly, a cable connector assembly, a retrieval assembly, and matching accessories. It can connect downhole instruments and test cables. During use, the breaking force of the headstock safety device is preset according to the well conditions of the well and the maximum safe tensile force of the test cable used.

[0003] Currently, the connectors used in perforation operations require the use of outer and inner armored steel wires in the cable to create weak points. Before each operation, the required outer and inner armored steel wires must be manually pressed into the copper conical sleeve. During this pressing process, the armored steel wires are unevenly distributed due to manual operation, and the copper conical sleeve experiences uneven stress, resulting in significant errors at the weak point and posing a safety hazard. Furthermore, this manufacturing process is complex and requires two people to complete, leading to low work efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a flexible weak point cable connector for well logging perforation, which solves the problem in the prior art that the armored steel wires are unevenly distributed and the copper cone sleeve is unevenly stressed due to manual operation and squeezing, resulting in large errors at the weak point and easy to cause construction safety hazards.

[0005] The technical solution adopted in this invention is a flexible weak point cable connector for logging perforation, comprising a connector lower connector, a housing, a retrieval head, an adapter, a connector upper connector, and a connecting body, all connected in sequence and configured as rotating bodies. Inside the connector lower connector, a copper conductive rod, a compression spring, a copper connecting rod, and a sealing plug are connected in sequence from the direction away from the housing to the direction closer to the housing. The other end of the sealing plug extends out of the connector lower connector and is located inside the housing, and is threaded with a copper threaded sleeve. A weak point lower connector is also provided inside the housing. At the end of the weak point lower connector opposite to the connector lower connector, a weak point and a weak point upper connector are connected in sequence. The weak point is fixed inside the connector upper connector. The weak point is formed by cold pressing steel wire.

[0006] The invention is further characterized in that,

[0007] A perforation magnetic positioning mounting hole is provided at the end of the lower connector facing away from the housing along its axial center line. A sliding sleeve is fitted on the inner wall of the perforation magnetic positioning mounting hole. The perforation magnetic positioning is threaded to the end of the lower connector facing away from the housing, and the conductive end of the perforation magnetic positioning extends into the sliding sleeve and is connected to the copper conductive rod to conduct the circuit. A retaining ring a is also provided at the end of the sliding sleeve away from the housing inside the perforation magnetic positioning mounting hole.

[0008] A conductive mounting hole is also provided at the end of the lower connector near the housing, located at the perforation magnetic positioning mounting hole. The center line of the conductive mounting hole coincides with that of the perforation magnetic positioning mounting hole and both coincide with the rotation center of the lower connector. A copper conductive rod, a compression spring, a copper connecting rod, and a sealing plug are arranged sequentially in the conductive mounting hole from the direction away from the housing to the direction near the housing. The end of the copper conductive rod away from the compression spring extends into the sliding sleeve.

[0009] An insulating protective sleeve is installed inside the conductive mounting hole. The copper conductive rod, compression spring, and copper connecting rod are all located inside the insulating protective sleeve. A retaining ring b is also installed inside the conductive mounting hole at the end near the perforation magnetic positioning mounting hole.

[0010] The housing and connector lower joint are fixedly connected by threads and the mating surfaces are sealed by O-rings.

[0011] The shell, retrieval head, adapter, and connector upper connector are all designed as cylindrical rotating structures. The shell and retrieval head are integrated. One end of the adapter is fitted onto the outer circumference of the retrieval head and the shell near the retrieval head. The mating surfaces of the adapter, retrieval head, and shell are sealed together by an O-ring seal b. The other end of the adapter extends into the connector upper connector and is fixed to the connector upper connector by a threaded connection.

[0012] The housing has a shoulder, and the weak point lower connector is positioned to move towards the weak point upper connector via the shoulder. The weak point is connected to both the weak point lower connector and the weak point upper connector by threaded connection. The connector upper connector has a shoulder a, and a clamp is provided between shoulder a and one end face of the adapter located inside the connector upper connector. The clamp is fixed to one end face of the adapter near the connector upper connector, and the end of the weak point upper connector away from the weak point is located inside the clamp.

[0013] The weak point connector is set as a smooth bolt. The end of the smooth bolt near the weak point is provided with an internal thread, and the end of the weak point near the weak point connector is provided with an external thread. The internal thread of the weak point connector and the external thread of the weak point cooperate to achieve a fixed connection between the weak point connector and the weak point.

[0014] The bare bolt is located inside the clamp, away from the weak point;

[0015] The clamp includes two semi-circular clamp parts arranged symmetrically to each other. Each clamp part is provided with a waist-shaped groove and two screw holes. A semi-circular hole is provided at the center of the clamp part. When the two clamp parts are combined, the two semi-circular holes are combined into a circular hole, and the circular hole is adapted to the diameter of the smooth bolt of the connector on the weak point. Each clamp part is also provided with a semi-annular boss concentric with the clamp part on one end face near the connector. The inner diameter of the boss is the same as the inner diameter of the semi-circular hole. Each clamp part is also provided with two screw holes a.

[0016] After the two clamps are combined, the clamp on the weak point of the connector is located in the round hole formed by the merging of the two semi-circular holes through the smooth rod bolt at one end of the connector; the clamp is fixedly connected to the end face of the adapter near the connector by the screw passing through the screw hole, and a spring washer is also provided between the screw and the clamp.

[0017] It also includes a positioning plate with a slot in the center. After the two clamps are separated and merged, the two bosses are merged into a circular boss. The slot is locked on the circular boss. The positioning plate has a screw hole b at the position corresponding to the screw hole a of the clamp. The positioning plate and the clamp are connected by screws passing through screw holes a and screw holes b. The positioning plate has a waist-shaped groove a at the position corresponding to the waist-shaped groove of the clamp.

[0018] A circular hole is provided in the center of the positioning plate, and the end of the weak point connector near the connector on the connector passes through the circular hole of the positioning plate.

[0019] An O-ring is also provided between the mating surfaces of the adapter and the connector.

[0020] The connector body is fitted onto the connector upper connector and fixed to the connector upper connector by a threaded connection. An O-ring seal d is also provided between the mating surfaces of the connector body and the connector upper connector. A sealing plug a is also provided inside the connector body. One end of the sealing plug a is connected to the end of the sealing plug near the connector upper connector by a through wire. The other end of the connector body is threaded to the male cable torpedo. The sealing plug a inside the connector body is electrically connected to the terminal of the male cable torpedo.

[0021] The beneficial effects of this invention are:

[0022] This invention exploits the weakness of cold-pressed steel wire forming, allowing the cable to be directly connected to the cable connector via a torpedo. This eliminates the auxiliary cable and torpedo adapter at the top of the torpedo head, enabling the cable to be pulled apart when the downhole instrument gets stuck, thus protecting the cable and significantly improving the efficiency, safety, and reliability of perforation operations.

[0023] The present invention allows for setting the size of the flexible weak point cable connector body for logging perforation according to the cable model, resulting in high adaptability.

[0024] This invention creates weak points by cold-pressing steel wire. During use, the safety break points of the weak points can be designed as needed. Therefore, during use, the safety break points of the weak points are within the specified range, with small errors and high construction safety, while also protecting the cable.

[0025] The present invention is made of cold-pressed steel wire rope, which has good physical and chemical properties and high stability.

[0026] The present invention has a simple structure, is easy to connect, and is easy to construct on site; compared with the existing technology that uses a two-person manual extrusion method, it is more convenient, safe, and more reliable. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the flexible weak point cable connector for logging perforation according to the present invention;

[0028] Figure 2 yes Figure 1 Enlarged view of the left half;

[0029] Figure 3 yes Figure 1 Enlarged view of the right half;

[0030] Figure 4 This is a schematic diagram of the clamping unit in the flexible weak point cable connector for well logging perforation of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the clamp formed by merging the separate clamp parts in the flexible weak point cable connector for logging perforation of the present invention;

[0032] Figure 6 yes Figure 5 Sectional view along axis AA;

[0033] Figure 7 This is a physical image of a flexible, weak-point cable connector for well logging perforation manufactured in an embodiment of the present invention.

[0034] In the diagram: 1. Retrieval head; 2. Sliding sleeve; 3. Copper conductive rod; 4. Retaining ring; 5. Connector lower connector; 6. Insulating protective sleeve; 7. Compression spring; 8. Copper connecting rod; 9. Shoulder; 10. O-ring seal; 11. Sealing insert; 12. O-ring seal; 13. Copper threaded sleeve; 14. Housing; 15. Weak point lower connector; 16. Weak point; 17. O-ring seal; 18. Adapter; 19. O-ring seal; 20. Weak point lower connector; 21. Clamp; 22. Positioning plate; 23. Screw; 24. Spring washer; 25. Connector upper connector; 26. O-ring seal; 27. Connector body; 28. Retaining ring a; 29. ​​Shoulder a; 30. Waist groove; 31. Screw hole; 32. Semi-circular hole; 33. Boss; 34. Screw hole a; 35. Clamp split body. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] This invention relates to a flexible, weak-point cable connector for well logging perforation, the structure of which is as follows: Figure 1-3 As shown, the device includes a lower connector 5, a housing 14, a retrieval head 1, an adapter 18, an upper connector 25, and a connecting body 27, all connected in sequence and configured as rotating bodies. Inside the lower connector 5, a copper conductive rod 3, a compression spring 7, a copper connecting rod 8, and a sealing plug 11 are connected in sequence from the direction away from the housing 14 to the direction closer to the housing 14. The other end of the sealing plug 11 extends out of the lower connector 5 and is located inside the housing 14, and is threadedly connected to a copper threaded sleeve 13. Inside the housing 14, a weak point lower connector 15 is also provided. The weak point lower connector 15 is connected in sequence to a weak point 16 and a weak point upper connector 20 at the end opposite to the lower connector 5. The weak point upper connector 20 is fixed inside the upper connector 25. The weak point 16 is a weak point formed by cold pressing steel wire.

[0038] A perforation magnetic positioning mounting hole is provided at one end of the connector lower connector 5 away from the housing 14 along its axial center line. A sliding sleeve 2 is fitted on the inner wall of the perforation magnetic positioning mounting hole. The perforation magnetic positioning is threaded to the end of the connector lower connector 5 away from the housing 14, and the conductive end of the perforation magnetic positioning extends into the sliding sleeve 2 and is connected to the copper conductive rod 3 to conduct the circuit. A retaining ring a28 is also provided at the end of the sliding sleeve 2 away from the housing 14 inside the perforation magnetic positioning mounting hole.

[0039] A conductive mounting hole is also provided at the end of the lower connector 5 near the housing 14 of the perforation magnetic positioning mounting hole. The center line of the conductive mounting hole coincides with the center line of the perforation magnetic positioning mounting hole and both coincide with the rotation center of the lower connector 5. A copper conductive rod 3, a compression spring 7, a copper connecting rod 8 and a sealing plug 11 are arranged sequentially in the conductive mounting hole from the direction away from the housing 14 to the direction near the housing 14. The end of the copper conductive rod 3 away from the compression spring 7 extends into the sliding sleeve 2.

[0040] An insulating protective sleeve 6 is installed inside the conductive mounting hole. The copper conductive rod 3, compression spring 7, and copper connecting rod 8 are all located inside the insulating protective sleeve 6. A retaining ring b4 is also installed inside the conductive mounting hole at the end near the perforation magnetic positioning mounting hole.

[0041] The housing 14, the retrieval head 1, the adapter 18, and the connector upper connector 25 are all configured as cylindrical rotating bodies. The housing 14 and the retrieval head 1 are integrally formed. One end of the adapter 18 is fitted onto the outer circumference of the retrieval head 1 and the housing 14 near the retrieval head 1. The other end of the adapter 18 extends into the connector upper connector 25 and is fixed to the connector upper connector 25 by means of threaded connection.

[0042] A shoulder 9 is provided inside the housing 14. The weak point lower connector 15 is positioned to move towards the weak point upper connector 20 through the shoulder 9. The weak point 16 is connected to both the weak point lower connector 15 and the weak point upper connector 20 by threaded connection. A shoulder a29 is provided inside the connector upper connector 25. A clamp 21 is provided between the shoulder a29 and the end face of the adapter 18 located inside the connector upper connector 25. The clamp 21 is fixed to the end face of the adapter 18 near the connector upper connector 25. The end of the weak point upper connector 20 away from the weak point 16 is located inside the clamp 21.

[0043] The connector 27 is fitted onto the connector upper connector 25 and fixed to the connector upper connector 25 by a threaded connection. The connector 27 is also provided with a sealing plug a. One end of the sealing plug a is connected to the end of the sealing plug 11 near the connector upper connector 25 by a through wire. The other end of the connector 27 is threaded to the male cable torpedo. The sealing plug a inside the connector 27 is electrically connected to the terminal of the male cable torpedo.

[0044] The working principle of this invention is as follows:

[0045] During perforation operations, the flexible weak point cable connector used for logging perforation is connected to the wiring terminal of the cable torpedo and the conductive terminal of the perforation magnetic positioning to connect the logging cable to the downhole instrument. When the downhole instrument gets stuck, the weak point is broken after the pulling force reaches the corresponding force. Then, the adapter 18 and the housing 14 separate. The housing 14 is exposed at the separation point to facilitate subsequent retrieval of the retrieval head 1. After disconnection, the equipment at the adapter 18 end, along with the cable, is lifted out of the well, thereby protecting the cable.

[0046] In use, the cable is directly connected to the cable connector of this invention via a torpedo, eliminating the need for the auxiliary cable and torpedo adapter at the top of the torpedo head. This facilitates the selection of salvage tools in complex downhole operations. This type of cable connector is also easy to assemble and disassemble, requires no sealing grease, and allows for simple and quick on-site maintenance. Compared to existing assemblies, it improves the efficiency of perforation operations and eliminates the need for manual squeezing. Based on its own tensile strength, the components can be separated when a certain tensile force is reached, without the need for manual operation, thus improving both safety and reliability.

[0047] Example 2

[0048] Based on Example 1, the clamp structure of the present invention is as follows: Figure 4-6 As shown, the weak point upper connector 20 is set as a smooth rod bolt. The end of the smooth rod bolt near the weak point 16 is provided with an internal thread, and the end of the weak point 16 near the weak point upper connector 20 is provided with an external thread. The internal thread of the weak point upper connector 20 and the external thread of the weak point 16 cooperate to realize the fixed connection between the weak point upper connector 20 and the weak point 16.

[0049] The bare bolt is located inside the clamp 21, away from the weak point 16;

[0050] The clamp 21 includes two semi-circular clamp parts 35 arranged symmetrically to each other. Each clamp part 35 is provided with a waist-shaped groove 30 and two screw holes 31. A semi-circular hole 32 is provided at the center of the clamp part 35. After the two clamp parts 35 are combined, the two semi-circular holes 32 are combined into a circular hole, and the circular hole is adapted to the diameter of the smooth bolt of the connector 20. Each clamp part 35 is also provided with a semi-annular boss 33 concentric with the clamp part 35 on one end face near the connector 25. The inner diameter of the boss 33 is the same as the inner diameter of the semi-circular hole 32. Each clamp part 35 is also provided with two screw holes a34.

[0051] After the two clamp parts 35 are combined, the weak point on the connector 20 is close to the connector on the clamp 21. The smooth rod bolt at one end of the connector 25 is located in the round hole formed by the combination of the two semi-circular holes 32. The clamp 21 is fixedly connected to the end face of the adapter 18 close to the connector 25 by the screw 23 passing through the screw hole 31. A spring washer 24 is also provided between the screw 23 and the clamp 21.

[0052] It also includes a positioning disk 22, which has a slot in the center. After the two clamp parts 35 are combined, the two bosses 33 are combined into a circular boss. The slot is locked on the circular boss. The positioning disk 22 has a screw hole b at the position corresponding to the screw hole a34 of the clamp 21. The positioning disk 22 and the clamp 21 are connected by screws passing through the screw hole a34 and the screw hole b. The positioning disk 22 has a waist-shaped groove a at the position corresponding to the waist-shaped groove 30 of the clamp 21.

[0053] The positioning disk 22 has a round hole in the center, and the end of the weak point connector 20 near the connector connector 25 passes through the round hole of the positioning disk 22.

[0054] In this embodiment, the clamp 21 achieves the merging of the two clamp halves 35 through the positioning plate 22. After the two clamp halves 35 are merged, the two semi-circular holes 32 are merged into a circular hole, and the smooth bolt of the weak point connector 20 is located in the merged circular hole.

[0055] Example 3

[0056] Based on Embodiment 2, the housing 14 and the lower connector 5 are fixedly connected by threads and their mating surfaces are sealed by O-rings a10; the mating surfaces of the adapter 18, the retrieval head 1, and the housing 14 are sealed by O-rings b17; an O-ring c19 is also provided between the mating surfaces of the adapter 18 and the upper connector 25; and an O-ring d26 is also provided between the mating surfaces of the connector 27 and the upper connector 25. This invention selects O-rings that can withstand the high temperature and high pressure downhole working environment, and at the same time, it can achieve sealing and insulation of each component.

[0057] Example 4

[0058] Based on Example 3, the main material of this invention is titanium alloy TC11, which is mainly used in the aerospace field. Compared with the 35CrMo material used in the prior art, it has higher durability, high pressure resistance, and high temperature resistance, and has higher material stability in complex downhole operating environments.

[0059] The sealing plug 11 and sealing plug a of the present invention are cylindrical logging sealing plugs.

[0060] Example 5

[0061] Based on Example 3, the weak point 16 wire rope of this invention uses the 6-6*19S+IWR type wire rope from API SPECIFICATION 9A, the standard for wire ropes used in the American petroleum industry. It is a stranded wire rope made of carbon steel with a steel core. Its structure and parameters are: 6-6*19 weak point, 6mm outer diameter, 6 strands of wire rope, and 19 wires twisted per strand. This type of logging-specific wire rope has high production and processing standards, thus ensuring its stable physical properties. Its main production process is: wire rod unwinding → surface treatment → drawing → heat treatment → drawing → galvanizing → strand twisting → rope assembly. This ensures that the logging-specific wire rope has high production and processing standards, thus guaranteeing its stable physical properties. Surface treatment removes surface rust, eliminates and reduces wear on the mold caused by iron oxide scale. After cleaning, a dense phosphate film is applied to the wire rod surface to facilitate subsequent drawing.

[0062] Drawing is a strong plastic deformation process. Before heat treatment, the steel wire is drawn 1-3 times; after heat treatment, it is drawn 10-12 times. The total compression ratio and average partial compression ratio of the steel wire are controlled. Simultaneously, process quality control is implemented for factors affecting drawing, such as machine speed, water cooling, air cooling, lubrication, and dies, to ensure that the semi-finished steel wire meets high strength requirements while achieving good toughness. Twisting: Generally, depending on the selected steel wire type, the steel core strands are twisted on a stranding machine. The lay length follows the lay length specifications on page 15 of the aforementioned American standard. For 6-6*19S+IWRC, the steel core lay length is right-handed, the strand lay length is left-handed, and the wire rope lays in a right-hand alternating lay. This type of logging-specific steel wire rope has high production and processing standards, thus ensuring its stable physical properties.

[0063] The weak point in the flexible weak point cable connector of this invention is selected from the finished steel wire rope weak point in the US petroleum industry standard, mainly considering its high stability and ability to ensure accurate breakage under high temperature and high pressure conditions. Regarding the selection of the weak point breaking value, based on actual requirements (6000 lbs (26.69 kN), 7000 lbs (31.14 kN), and 8000 lbs (35.59 kN), and considering the internal structure of the cable connector, specifications such as 6mm, 8mm, and 10mm were selected to conform to the structural system. The weak point was selected according to API Specification 9A to meet the actual requirements. In this embodiment, the tensile strength of the 7000 lb weak point has been verified, and it meets the requirements of the weak point of this invention.

[0064] The present invention uses the above-mentioned steel wire rope as the weak point 16. Its safety break point can meet the tensile strength of 7000±8% lbs. After third-party testing, the tensile strength error meets the above range. During the well logging process, the component separates, which protects the cable in time and also has high safety. Compared with the existing technology of manual pressing, which will cause a large error in the weak point value and pose certain safety hazards during construction.

[0065] Example 6

[0066] Based on Example 5, the physical diagram of the flexible weak point cable connector for logging perforation manufactured in this example is shown below. Figure 7 As shown, its technical parameters are listed in Table 1:

[0067] Table 1 - Technical Specifications

[0068]

[0069]

[0070] The results of applying the cable connector manufactured in this embodiment to actual production are as follows:

[0071] Case 1: C4564 team of the Longdong Project Department of CNPC Logging Changqing Branch conducted a conventional perforation test on well Long 94 in the Longdong risk exploration block. The perforation depth was 4670 meters, and a 4-meter large-diameter deep penetration gun was used for the well entry test. The perforation flexibility weak maintenance-free quick connector and cable were properly matched, and the connection with the instrument was normal. After the operation, the seal was good, and the circuit connection performance was intact.

[0072] Case 2. C4564 team of Longdong Project Department of CNPC Logging Changqing Branch conducted an in-well test on Hetan 14 well with a perforation section depth of 4030 meters and a 4-meter large-diameter deep penetration gun. The well was used twice. The perforation flexibility weak maintenance-free quick connector and cable were properly matched and connected to the instrument series normally. After the construction was completed, the seal was good and the circuit connection performance was good.

[0073] To compare the manufacturing time of the flexible weak-point cable connector of the present invention with that of a conventional perforated faucet, the time points of difference were statistically analyzed: the time taken from manufacturing and replacing the weak point to completing the assembly. The comparison results of the two time differences are shown in Table 2.

[0074] Table 2

[0075]

[0076]

[0077] According to the statistics in the table, the average time for fabricating the weak point of the braided perforated horsehead connector is 45 minutes, and the average assembly time is 55 minutes, totaling 100 minutes. The newly designed connector, because it eliminates the need for weak point fabrication, has an average assembly time of only 9 minutes, saving over 90% of the total time.

[0078] The flexible weak point cable connector of the present invention was used in 106 wells of conventional cable transmission perforation in the Longdong shale oil field. A nominal 7000kbl tensile bar was selected as the weak point for testing. The tensile strength of the flexible weak point cable connector of the present invention for logging perforation was tested after 10, 20, 30 and 46 well runs. The test results showed that the deviation of the values ​​in the four tests was ≤±8%, which meets the industry standards and field requirements.

[0079] This invention provides a flexible, low-power cable connector for logging perforation that meets the standards and requirements of the perforation site regarding the mechanical connection, low-power performance, circuit compatibility, and sealing performance of downhole tools. It enables rapid connection and maintenance at the perforation site, facilitating quick connection and maintenance by the work team. By controlling the low-power components and eliminating redundant structures (there is a section of attached cable and a pair of torpedo adapters at the top of the connector), it is highly beneficial for handling complex downhole engineering situations. It fundamentally solves the problem of the difficulty in passing three-ball retrieval devices during complex handling of perforation operations using conventional cable transmission.

Claims

1. A flexible, weak-point cable connector for well logging perforation, characterized in that, The device includes a lower connector (5), a housing (14), a retrieval head (1), an adapter (18), an upper connector (25), and a connector (27) connected in sequence and all configured as rotating bodies. The lower connector (5) contains a copper conductive rod (3), a compression spring (7), a copper connecting rod (8), and a sealing plug (11) connected in sequence from the direction away from the housing (14) to the direction close to the housing (14). The other end of the sealing plug (11) extends out of the lower connector (5) and is located inside the housing (14) and is threaded with a copper threaded sleeve (13). The housing (14) also contains a weak point lower connector (15). The weak point lower connector (15) is connected in sequence to a weak point (16) and a weak point upper connector (20) at the end away from the lower connector (5). The weak point upper connector (20) is fixed inside the upper connector (25). The weak point (16) is a weak point formed by cold pressing steel wire.

2. The flexible weak point cable connector for well logging perforation according to claim 1, characterized in that, The lower connector (5) of the connector is provided with a perforation magnetic positioning mounting hole along its axial center line at one end away from the housing (14). A sliding sleeve (2) is fitted on the inner wall of the perforation magnetic positioning mounting hole. The perforation magnetic positioning is connected to the lower connector (5) of the connector away from the housing (14) by a thread, and the conductive end of the perforation magnetic positioning extends into the sliding sleeve (2) and is connected to the copper conductive rod (3) for circuit conduction. A retaining ring a (28) is also provided at the end of the sliding sleeve (2) away from the housing (14) in the perforation magnetic positioning mounting hole.

3. The flexible weak point cable connector for logging perforation according to claim 2, characterized in that, The lower connector (5) of the connector is provided with a conductive mounting hole at the end of the perforation magnetic positioning mounting hole near the housing (14). The center line of the conductive mounting hole coincides with the center line of the perforation magnetic positioning mounting hole and both coincide with the rotation center of the lower connector (5). The copper conductive rod (3), compression spring (7), copper connecting rod (8) and sealing plug (11) are arranged sequentially in the conductive mounting hole from the direction away from the housing (14) to the direction near the housing (14). The end of the copper conductive rod (3) away from the compression spring (7) extends into the sliding sleeve (2).

4. The flexible weak point cable connector for logging perforation according to claim 3, characterized in that, An insulating protective sleeve (6) is provided inside the conductive mounting hole. The copper conductive rod (3), compression spring (7), and copper connecting rod (8) are all located inside the insulating protective sleeve (6). A retaining ring b (4) is also installed inside the conductive mounting hole at one end near the perforation magnetic positioning mounting hole.

5. The flexible weak point cable connector for logging perforation according to claim 1, characterized in that, The housing (14) and the connector lower joint (5) are fixedly connected by threads and the mating surfaces are sealed by an O-ring a (10).

6. The flexible weak point cable connector for logging perforation according to claim 1, characterized in that, The housing (14), retrieval head (1), adapter (18), and connector upper connector (25) are all configured as cylindrical rotating bodies. The housing (14) and retrieval head (1) are integrally formed. One end of the adapter (18) is fitted onto the outer circumference of the retrieval head (1) and the housing (14) near the retrieval head (1). The mating surfaces of the adapter (18), the retrieval head (1), and the housing (14) are sealed together by an O-ring seal b (17). The other end of the adapter (18) extends into the connector upper connector (25) and is fixed to the connector upper connector (25) by a threaded connection.

7. The flexible weak point cable connector for logging perforation according to claim 6, characterized in that, The housing (14) is provided with a shoulder (9). The weak point lower connector (15) is positioned by moving towards the weak point upper connector (20) through the shoulder (9). The weak point (16) is connected to the weak point lower connector (15) and the weak point upper connector (20) by threaded connection. The connector upper connector (25) is provided with a shoulder a (29). A clamp (21) is provided between the shoulder a (29) and the adapter (18) at one end face inside the connector upper connector (25). The clamp (21) is fixed on the adapter (18) at one end face near the connector upper connector (25). The end of the weak point upper connector (20) away from the weak point (16) is located inside the clamp (21).

8. The flexible weak point cable connector for logging perforation according to claim 7, characterized in that, The weak point connector (20) is set as a smooth bolt. The end of the smooth bolt near the weak point (16) is provided with an internal thread, and the end of the weak point (16) near the weak point connector (20) is provided with an external thread. The internal thread of the weak point connector (20) and the external thread of the weak point (16) cooperate to realize the fixed connection between the weak point connector (20) and the weak point (16). The bare bolt is located inside the clamp (21) away from the weak point (16); The clamp (21) includes two semi-circular clamp parts (35) arranged symmetrically to each other. Each clamp part (35) is provided with a waist-shaped groove (30) and two screw holes (31). A semi-circular hole (32) is provided at the center of the clamp part (35). After the two clamp parts (35) are combined, the two semi-circular holes (32) are combined into a circular hole and the circular hole is adapted to the diameter of the smooth bolt of the connector (20) on the weak point. Each clamp part (35) is also provided with a semi-circular boss (33) with the same center as the clamp part (35) on one end face near the connector (25). The inner diameter of the boss (33) is the same as the inner diameter of the semi-circular hole (32). Each clamp part (35) is also provided with two screw holes a (34). After the two clamp parts (35) are combined, the weak point connector (20) is located in the circular hole formed by the two semi-circular holes (32) through the smooth rod bolt at one end of the connector (25) near the clamp (21) of the connector; the clamp (21) is fixedly connected to the end face of the adapter (18) near the connector (25) of the connector by the screw (23) passing through the screw hole (31); a spring washer (24) is also provided between the screw (23) and the clamp (21); It also includes a positioning disk (22), the positioning disk (22) has a slot in the center, the two clamp parts (35) are combined and the two bosses (33) are combined into a circular boss, the slot is locked on the circular boss, the positioning disk (22) has a screw hole b at the position corresponding to the screw hole a (34) of the clamp (21), the positioning disk (22) and the clamp (21) are connected by screws passing through the screw hole a (34) and the screw hole b, the positioning disk (22) has a waist-shaped groove a at the position corresponding to the waist-shaped groove (30) of the clamp (21); The positioning disk (22) has a circular hole in the center, and the end of the weak point connector (20) near the connector connector (25) passes through the circular hole of the positioning disk (22).

9. The flexible weak point cable connector for logging perforation according to claim 7, characterized in that, An O-ring c (19) is also provided between the mating surfaces of the adapter (18) and the connector (25).

10. The flexible weak point cable connector for logging perforation according to claim 9, characterized in that, The connector (27) is fitted onto the connector upper connector (25) and fixed to the connector upper connector (25) by means of threaded connection. An O-ring d (26) is also provided between the mating surfaces of the connector (27) and the connector upper connector (25). A sealing plug a is also provided inside the connector (27). One end of the sealing plug a is connected to the end of the sealing plug (11) near the connector upper connector (25) by a through wire. The other end of the connector (27) is threaded to the male cable torpedo. The sealing plug a inside the connector (27) is electrically connected to the terminal of the male cable torpedo.

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