High-temperature and high-pressure electrically-controlled releasing short joint for well logging

Abstract

A kind of high temperature and high pressure well logging electric control release nipple, shock-absorbing mechanism, motor support are arranged in upper connector, motor, release control mechanism are arranged in motor support, axial mounting hole is processed in the center of guiding seat, wire hole is arranged in one side axial, transmission mechanism and lower connector release assembly are arranged in the axial mounting hole of guiding seat, the power end of motor is connected with transmission mechanism through release control mechanism, transmission mechanism lower end is provided with lower connector release assembly, limiting cylinder is arranged in the lower end of guiding seat, lower connector is arranged in the lower end of lower connector release assembly in limiting cylinder, cable hole is processed on lower connector, cable is inserted from upper connector, passes through wire hole on guiding seat, and is taken out from lower connector cable hole.The structure of the present application has excellent temperature resistance and pressure resistance, and can operate the motor to release according to the downhole conditions, and has two-stage safety and discard steps, to ensure safety during normal use, and meet the needs of resistance and discard.

Description

Technical Field

[0001] This invention relates to the field of high-pressure logging equipment technology, specifically to a high-temperature and high-pressure logging electrically controlled release sub. Background Technology

[0002] Cable logging and cable-transmitted perforation are common construction techniques in oil and gas field development. Cables provide power to downhole tools and transmit downhole measurement data. Due to the inherent mechanical properties of cables, they are prone to sturdiness under tension and bending under pressure. When encountering obstacles during pull-up in open-hole sections due to collapse, they are susceptible to overload and breakage, causing construction accidents. Because the ends of cables and tools are difficult to retrieve, once the cable breaks, tool retrieval becomes difficult, leading to long-term well blockage and impacting subsequent development. Therefore, a tool that can detach and disconnect upon command and is easily retrieved is needed to assist in cable logging operations. Existing mechanical release structures have poor breaking accuracy and are prone to mis-dropping. A mechanical or electrically controlled structure with precise release is needed to achieve selective release and discard, while also being adaptable to the high-temperature and high-pressure environment of the well. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-temperature and high-pressure logging electrically controlled release sub that is resistant to perforation impact, vibration, and easy to retrieve.

[0004] The technical solution adopted to solve the above technical problems is: a high-temperature and high-pressure logging electrical control release sub, wherein the upper connector is provided with a shock absorption mechanism, a motor bracket, and a guide seat in sequence from top to bottom; the motor bracket is provided with a motor and a release control mechanism; the center of the guide seat is machined with an axial mounting hole and one side is provided with an axial through-hole for wire passing; the axial mounting hole of the guide seat is provided with a transmission mechanism and a lower connector release assembly; the power end of the motor is connected to the transmission mechanism through the release control mechanism; the lower end of the transmission mechanism is provided with a lower connector release assembly; the lower end of the guide seat is provided with a limit cylinder; the lower end of the lower connector release assembly in the limit cylinder is provided with a lower connector; the lower connector is machined with a cable hole; the cable enters from the upper connector, passes through the cable hole on the guide seat, and exits from the cable hole of the lower connector.

[0005] The release control mechanism includes a sliding shaft, an upper drive shaft, an upper electromagnet, a lower drive shaft, a lower electromagnet, and a shock-absorbing spring. The power end of the motor is threadedly connected to the upper drive shaft via the sliding shaft. The upper electromagnet is mounted on the upper drive shaft, and the lower electromagnet is positioned below the upper electromagnet at a certain distance. A shock-absorbing spring is positioned between the upper and lower electromagnets. The lower drive shaft is positioned at the center of the lower electromagnet, and the upper center of the lower drive shaft has a mounting hole that matches the lower end of the upper drive shaft. A cable supplies power to the motor, the upper electromagnet, and the lower electromagnet.

[0006] As a preferred technical solution, the transmission mechanism includes a coupling and a lead screw, with the lead screw connected to the lower transmission shaft via the coupling.

[0007] As a preferred technical solution, the axial mounting hole of the guide seat is composed of a coupling mounting hole, a lead screw mounting hole, and a release component mounting hole connected from top to bottom. The lower connector release component is located in the release component mounting hole, and a release spring is installed between the bottom of the release component mounting hole and the lower connector release component. The release spring is fitted on the lead screw.

[0008] As a preferred technical solution, the lower connector release assembly includes a release connector and a limiting slider. The upper center of the cylindrical release connector has an integrally formed release hole and a locking hole machined sequentially from top to bottom. The diameter of the release hole is greater than the maximum outer diameter of the limiting slider, which is greater than the diameter of the locking hole. Uniformly distributed axial dividing grooves are machined along the circumferential direction on the walls of the release hole and the locking hole, dividing the walls into multiple pieces. A radial boss is machined on the outer wall of the release connector opposite the locking hole, with a sloped lower end face. An annular boss is machined inside the limiting cylinder, with a sloped upper part on the inner side wall of the annular boss. An axial screw hole is machined at the center of the upper end face of the limiting slider, connecting it to a lead screw. When the limiting slider is located inside the locking hole, the locking hole wall is opened, and the radial boss of the release connector is locked onto the annular boss of the limiting cylinder. When the limiting slider is located in the release hole, the release connector is in a released state.

[0009] As a preferred technical solution, the inclination angle of the inclined surface on the radial boss is less than the inclination angle of the inclined surface on the annular boss.

[0010] As a preferred technical solution, an anti-rotation block is provided on the wall of the release assembly mounting hole of the guide seat.

[0011] As a preferred technical solution, a bearing is provided between the coupling and the guide seat, and a rotating seal is installed between the lead screw and the guide seat.

[0012] As a preferred technical solution, the shock absorption mechanism includes a shock absorption base and a sealing base, with the sealing base disposed between the shock absorption base and the upper connector and the motor bracket.

[0013] As a preferred technical solution, the lower connector has a boss radially machined on the outer side of its upper end, which serves as a retrieval head.

[0014] As a preferred technical solution, a liquid guiding hole is provided on the upper limiting cylinder wall of the lower connector.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention utilizes the attraction between upper and lower electromagnets to connect the upper and lower drive shafts. Under the power of a motor, the release joint and lower joint are released via a transmission mechanism. The entire release process is achieved through the axial displacement of a limiting slider. The release joint and the retrieval head at the upper end of the lower joint are connected by threads, increasing structural rigidity and shock resistance. The retrieval head has a gripping structure that engages with external retrieval tools after release. When the release section needs to be retrieved, the retrieval tool engages the gripping structure of the retrieval head, thereby retrieving the release joint and lower joint together. This invention features excellent temperature and pressure resistance, and can be electrically controlled to detach and release according to downhole conditions. It also has a two-stage safety and discarding mechanism to ensure safety during normal use and to meet the need for obstacle detection and discarding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the high-temperature and high-pressure logging electrical control release sub of the present invention.

[0018] Figure 2 This is a schematic diagram of the release control mechanism of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the transmission shaft 23 of the present invention.

[0020] Figure 4 yes Figure 3 AA sectional view.

[0021] Figure 5 This is a schematic diagram showing the connection between the transmission mechanism and the lower connector release assembly of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the release connector 10 of the present invention.

[0023] Figure 7 yes Figure 6 CC section view.

[0024] Figure 8 yes Figure 5 A magnified view of part B in the middle.

[0025] The components include: 1. Upper connector; 2. Shock-absorbing base; 3. Sealing base; 4. Upper motor bracket; 5. Lower motor bracket; 6. Shock-absorbing spring; 7. Guide seat; 8. Release spring; 9. Anti-rotation block; 10. Release connector; 10-1. Radial boss; 10-2. Axial dividing groove; 10-3. Release hole; 10-4. Locking hole; 11. Liquid guiding hole; 12. Retrieval head; 13. Limiting cylinder; 13-1. Annular boss; 14. Lower connector; 15. Limiting slider; 16. Lead screw; 17. Rotary seal; 18. Coupling; 19. Cable sealing head; 20. Lower electromagnet; 21. Lower drive shaft; 22. Upper electromagnet; 23. Upper drive shaft; 24. Sliding shaft; 25. Motor; 26. Cable. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0027] exist Figure 1 In this embodiment, the high-temperature and high-pressure logging electrical control release sub includes an upper connector 1, a shock absorption mechanism, a motor bracket, a guide seat 7, a motor 25, a release control mechanism, a transmission mechanism, a limit cylinder 13, a lower connector release assembly, and a lower connector 14.

[0028] The upper connector 1 contains, from top to bottom, a shock absorption mechanism, a motor bracket, and a guide seat 7. The motor bracket consists of an upper motor bracket 4 and a lower motor bracket 5. A motor 25 is fixedly installed between the upper motor bracket 4 and the lower motor bracket 5. A release control mechanism is installed inside the lower motor bracket 5. The lower end of the lower motor bracket 5 is fixedly connected to the guide seat 7 by threads. The guide seat 7 is fixedly connected to the upper connector 1 by threads. An axial mounting hole is machined in the center of the guide seat 7, and a wire-passing hole is provided axially on one side. A cable sealing head 19 is provided on the upper end of the wire-passing hole. A transmission cable is installed in the axial mounting hole of the guide seat 7. The lower connector release assembly and the drive mechanism are connected to the transmission mechanism via the release control mechanism. The lower end of the transmission mechanism is connected to the lower connector release assembly. The lower outer side of the guide seat 7 is fixedly connected to the limiting cylinder 13 via threads. The lower end of the lower connector release assembly inside the limiting cylinder 13 is fixedly connected to the lower connector 14 via threads. The wall of the limiting cylinder 13 above the lower connector 14 has evenly distributed liquid guiding holes 11, which are used to allow external liquid to flow into the cavity of the limiting cylinder 13 during operation. During the release process of the lower connector release assembly and the lower connector 14, the pressure of the device is balanced with the gas pressure in the high-pressure gas well. The upper outer side of the lower connector 14 has a boss radially machined as a retrieval head 12, which is used to match external retrieval tools for easy retrieval later. The lower connector 14 has a cable 26 hole. The cable 26 enters from the upper connector 1, passes through the cable hole on the guide seat 7, and exits from the cable 26 hole of the lower connector 14. The cable 26 supplies power to the motor 25 and the release control mechanism.

[0029] exist Figures 2-4In this embodiment, the release control mechanism includes a sliding shaft 24, an upper drive shaft 23, an upper electromagnet 22, a lower drive shaft 21, a lower electromagnet 20, and a shock-absorbing spring 6. The sliding shaft 24 is fixedly mounted on the power end of the motor 25. The upper drive shaft 23 is threaded onto the sliding shaft 24. The lower end of the upper drive shaft 23 is a connecting end with a quadrilateral cross-section. The motor 25 drives the sliding shaft 24 to rotate, causing the upper drive shaft 23 to move along the sliding shaft 24. The upper electromagnet 22 is fixedly mounted on the upper drive shaft 23. The lower electromagnet 20 is installed at a certain distance below the upper electromagnet 22. The lower electromagnet 20 is fixedly mounted on the lower bracket 5 of the motor 25. The upper electromagnet 22 and the lower electromagnet... A shock-absorbing spring 6 is installed between 20. The connecting end of the upper drive shaft 23 extends into the shock-absorbing spring 6. The upper electromagnet 22 and the lower electromagnet 20 are connected to the cable 26 through wires. The lower drive shaft 21 is fixedly installed at the center of the lower electromagnet 20. The upper end of the lower drive shaft 21 has a mounting hole that matches the connecting end of the upper drive shaft 23. When the upper electromagnet 22 and the lower electromagnet 20 are energized, a magnetic force attracting each other is generated on the upper electromagnet 22 and the lower electromagnet 20. Under the action of the magnetic force of the upper electromagnet 22 and the sliding shaft 24, the upper drive shaft 23 moves downward, and the shock-absorbing spring 6 is compressed until the connecting end of the upper drive shaft 23 is completely inserted into the mounting hole at the upper end of the lower drive shaft 21.

[0030] exist Figure 5 In this embodiment, the axial mounting hole of the guide seat 7 is composed of a coupling 18 mounting hole, a lead screw 16 mounting hole, and a release joint 10 mounting hole connected from top to bottom. The transmission mechanism includes a coupling 18 and a lead screw 16. The coupling 18 is installed in the coupling 18 mounting hole, and a bearing is installed between the coupling 18 and the guide seat 7. The coupling 18 is used to transmit motion and mitigate the impact caused by rotation. The lead screw 16 is installed in the lead screw 16 mounting hole, and a rotation seal is installed between the lead screw 16 and the guide seat 7. The seal 17 and the lead screw 16 are connected to the lower drive shaft 21 via the coupling 18. The lower end of the lead screw 16 is threadedly connected to the lower connector release assembly, which is located in the release connector mounting hole. A release spring 8 is fitted on the lead screw 16 between the bottom of the release connector mounting hole and the lower connector release assembly. An anti-rotation block 9 is provided on the wall of the release connector 10 mounting hole, which is used to restrict the rotation of the limit slider 15 of the lower connector release assembly when the motor 25 drives the lead screw 16 to rotate, so that the limit slider 15 forms an axial translation.

[0031] The lower connector release assembly of this embodiment includes a release connector 10 and a limiting slider 15. The cylindrical release connector 10 has a release hole 10-3 and a locking hole 10-4 machined sequentially from top to bottom at its upper center. Figure 6The diameter of the release hole 10-3 is greater than the maximum outer diameter of the limit slider 15, which is greater than the diameter of the locking hole 10-4. Uniformly distributed axial dividing grooves 10-2 are machined along the circumferential direction on the walls of the release hole 10-3 and the locking hole 10-4, dividing the walls of these holes into multiple pieces, such as... Figure 7 A radial boss 10-1 is machined on the outer wall of the release connector 10 corresponding to the locking hole 10-4. The lower end face of the radial boss 10-1 is a bevel. An annular boss 13-1 is machined inside the limiting cylinder 13. The upper part of the inner side wall of the annular boss 13-1 is machined with a bevel. The inclination angle of the bevel of the annular boss 13-1 in the limiting cylinder 13 is greater than the inclination angle of the bevel of the annular boss 13-1 in the release connector 10. Figure 8 To facilitate downward release of the release connector 10, the center of the upper end face of the limiting slider 15 is machined with an axial screw hole connected to the lead screw 16. When the lead screw 16 rotates, it drives the limiting slider 15 to move axially. When the limiting slider 15 is located in the locking hole 10-4, the wall of the locking hole 10-4 is opened, so that the radial boss 10-1 of the release connector 10 is locked on the annular boss 13-1 of the limiting cylinder 13. When the limiting slider 15 is located in the release hole 10-3, the release connector 10 is in the released state.

[0032] The shock absorption mechanism in this embodiment includes a shock absorption base 2 and a sealing base 3. The sealing base 3 is disposed between the shock absorption base 2, the upper connector 1, and the upper motor bracket 4, and is used to fix the upper motor bracket 4 and reduce the vibration of the upper motor bracket 4.

[0033] The working principle of this invention is as follows:

[0034] After the device is positioned in the well, the motor 25 and the release control mechanism are simultaneously powered on. The motor 25 drives the sliding shaft 24 to rotate, causing the upper drive shaft 23 to move downwards along the sliding shaft 24. Simultaneously, under the magnetic attraction between the upper electromagnet 22 and the lower electromagnet 20, the shock-absorbing spring 6 is compressed until the connecting end of the upper drive shaft 23 is fully inserted into the mounting hole at the upper end of the lower drive shaft 21, thus connecting the upper drive shaft 23 and the lower drive shaft 21 as one unit. At this point, after the motor 25 starts, the lower drive shaft 21 rotates together with the upper drive shaft 23. The lower drive shaft 21 is connected via a coupling. The device 18 is connected to a lead screw 16, which rotates with the lower drive shaft 21. Since the lead screw 16 is threadedly connected to the limiting slider 15, the limiting slider 15 moves upward and moves from the locking hole 10-4 of the release connector 10 to the release hole 10-3. During this process, the force at the contact position between the inclined surface of the radial boss 10-1 of the release connector 10 and the inclined surface of the annular boss 13-1 of the limiting cylinder 13 is decomposed into a force that contracts towards the center and a force perpendicular to the inclined surface. Under the action of the force, the release connector 10 and the connected lower connector 14 are released together from the perforation section.

Claims

1. A high-temperature, high-pressure logging electrically controlled release sub, characterized in that: The upper connector (1) is provided with a shock absorption mechanism, a motor bracket, and a guide seat (7) from top to bottom. The motor bracket is provided with a motor (25) and a release control mechanism. The center of the guide seat (7) is machined with an axial mounting hole, and a wire hole is provided through the axial path on one side. The axial mounting hole of the guide seat (7) is provided with a transmission mechanism and a lower connector release assembly. The power end of the motor (25) is connected to the transmission mechanism through the release control mechanism. The lower end of the transmission mechanism is provided with a lower connector release assembly. The lower end of the guide seat (7) is provided with a limit cylinder (13). The lower end of the lower connector release assembly in the limit cylinder (13) is provided with a lower connector (14). The lower connector (14) is machined with a cable (26) hole. The cable (26) is inserted from the upper connector (1), passes through the wire hole on the guide seat (7), and exits from the cable (26) hole of the lower connector (14). The release control mechanism includes a sliding shaft (24), an upper drive shaft (23), an upper electromagnet (22), a lower drive shaft (21), a lower electromagnet (20), and a shock-absorbing spring (6). The power end of the motor (25) is threadedly connected to the upper drive shaft (23) through the sliding shaft (24). The upper electromagnet (22) is mounted on the upper drive shaft (23). The lower electromagnet (20) is arranged at a certain distance below the upper electromagnet (22). The shock-absorbing spring (6) is arranged between the upper electromagnet (22) and the lower electromagnet (20). The lower drive shaft (21) is arranged at the center of the lower electromagnet (20). The upper center of the lower drive shaft (21) is axially arranged with a mounting hole that matches the lower end of the upper drive shaft (23). The cable (26) supplies power to the motor (25), the upper electromagnet (22), and the lower electromagnet (20). The transmission mechanism includes a coupling (18) and a lead screw (16), and the lead screw (16) is connected to the lower transmission shaft (21) through the coupling (18); The axial mounting hole of the guide seat (7) is composed of a coupling (18) mounting hole, a lead screw (16) mounting hole and a release component mounting hole connected from top to bottom. The lower connector release component is located in the release component mounting hole. A release spring (8) is installed between the bottom of the release component mounting hole and the lower connector release component. The release spring (8) is fitted on the lead screw (16). The lower connector release assembly includes a release connector (10) and a limiting slider (15). The cylindrical release connector (10) has a release hole (10-3) and a locking hole (10-4) machined sequentially from top to bottom at its upper center. The diameter of the release hole (10-3) is greater than the maximum outer diameter of the limiting slider (15) and greater than the diameter of the locking hole (10-4). Uniformly distributed axial dividing grooves (10-2) are machined along the circumferential direction on the walls of the release hole (10-3) and the locking hole (10-4), dividing the walls of the release hole (10-3) and the locking hole (10-4) into multiple pieces. A diameter... The lower end face of the radial boss (10-1) is inclined. The limiting cylinder (13) is machined with an annular boss (13-1). The upper part of the inner side wall of the annular boss (13-1) is machined with an inclined surface. The center of the upper end face of the limiting slider (15) is machined with an axial screw hole connected to the lead screw (16). When the limiting slider (15) is located in the locking hole (10-4), the wall of the locking hole (10-4) is opened, and the radial boss (10-1) of the release connector (10) is stuck on the annular boss (13-1) of the limiting cylinder (13) and is in a locked state. When the limiting slider (15) is located in the release hole (10-3), the release connector (10) is in a released state.

2. The high-temperature and high-pressure logging electrically controlled release sub according to claim 1, characterized in that, The inclination angle of the inclined surface of the radial boss (10-1) is less than the inclination angle of the inclined surface of the annular boss (13-1).

3. The high-temperature and high-pressure logging electrically controlled release sub according to claim 1, characterized in that, An anti-rotation block (9) is provided on the wall of the release component mounting hole of the guide seat (7).

4. The high-temperature and high-pressure logging electrically controlled release sub according to claim 1, characterized in that, A bearing is provided between the coupling (18) and the guide seat (7), and a rotating seal (17) is installed between the lead screw (16) and the guide seat (7).

5. The high-temperature and high-pressure logging electrically controlled release sub according to claim 1, characterized in that, The shock absorption mechanism includes a shock absorption base (2) and a sealing base (3), with the sealing base (3) disposed between the shock absorption base (2), the upper connector (1), and the motor bracket.

6. The high-temperature and high-pressure logging electrically controlled release sub according to claim 1, characterized in that, The lower connector (14) has a boss radially machined on the outer side of its upper end, which serves as a retrieval head (12).

7. The high-temperature and high-pressure logging electrically controlled release sub according to claim 1, characterized in that, A liquid guiding hole (11) is provided on the wall of the limiting cylinder (13) above the lower connector (14).

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