An ultra-short sub connection joint based on keyway cooperation

Abstract

The utility model relates to petroleum logging instrument, in order to solve the problem that existing nipple joint is longer, butt joint precision is low and service life is short and so on, and a kind of ultra-short nipple joint based on keyway cooperation is provided, including upper nipple lower interface and the plug assembly being set in it, and lower nipple upper interface and the socket assembly being set in its end portion, plug assembly includes plug mounting seat and multiple plug pins, plug mounting seat is equipped with plug key locating groove, its both sides are provided with anti-rotation boss, the inner wall of upper nipple lower interface is provided with plug fixing groove, anti-rotation boss is connected in plug fixing groove;Socket assembly includes socket mounting seat and one socket, socket mounting seat is provided with plug key, the inner wall of upper nipple lower interface is also provided with internal thread, the outside of lower nipple upper interface is provided with threaded ring installation groove, and threaded ring installation groove is movably installed with the threaded ring compatible with internal thread.

Description

Technical Field

[0001] This utility model relates to oil well logging equipment, specifically to an ultra-short joint based on keyway fit. Background Technology

[0002] Subsections are key components used in oil logging operations to connect, secure, or protect instrument components. In addition to their basic connecting function, subsections must withstand high pressure and high temperature during oil logging. Pressure changes in the underground oil layer can lead to instability in the pressure inside the tubing. The pressure-bearing structure between subsections can effectively balance these pressure fluctuations, protect the tubing from damage, and ensure the continuity and stability of oil logging.

[0003] Figure 1 The diagram shows a conventional short-section connector for oil well logging. In this connector, a slot is provided on the outer wall of the upper interface 4 of the lower short section, and a key is provided on the inner wall of the lower interface 3 of the upper short section. Because the key and slot are located on the lower interface 3 and the upper interface 4 of the lower short section, the length of the short-section connection structure and positioning structure (i.e., the connector) between them is relatively long, making the installation process complex. Under the complex stress environment downhole, the stability and reliability of the connection between the various short sections cannot be guaranteed. Its mechanical connection strength, docking accuracy, and service life need to be improved. Therefore, a simpler and more reliable short-section connection structure needs to be designed to ensure the stability of the short-section connection between the lower interface of the upper short section and the upper interface of the lower short section. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of existing short joints, such as long joints, complicated installation process, low mating accuracy and short service life, and to propose an ultra-short joint based on keyway mating.

[0005] To achieve the above objectives, the technical solution proposed by this utility model is as follows: An ultra-short joint connector based on keyway mating includes a lower interface of an upper joint and a plug assembly disposed therein, as well as an upper interface of a lower joint and a socket assembly disposed at its end. Its distinctive feature is that: The plug assembly includes a plug mounting base and multiple pins disposed in the middle of the plug mounting base. A key positioning groove is provided axially on the outer circumferential surface of the plug mounting base, and anti-rotation bosses are provided on both sides of the key positioning groove. A plug fixing groove is provided on the inner wall of the lower interface of the upper sub section at a position corresponding to the key positioning groove. The plug assembly is engaged in the plug fixing groove by the anti-rotation bosses on both sides of the key positioning groove, which is used to circumferentially position the plug assembly and prevent it from rotating. The socket assembly includes a socket mounting base and a plurality of sockets disposed in the middle of the socket mounting base and adapted to a plurality of pins; the outer circumference of the socket mounting base is provided with a key extending outward along the axial direction and adapted to a key positioning groove, for forming circumferential positioning during the assembly of the plug assembly and the socket assembly. An internal thread is provided on the inner wall of the lower interface of the upper subsection located at the outer end of the plug assembly; a threaded ring mounting groove is provided on the outer side of the upper interface of the lower subsection, and a threaded ring adapted to the internal thread is rotatably installed in the threaded ring mounting groove. The assembly relationship between the plug assembly and the socket assembly is adjusted by adjusting the connection relationship between the threaded ring and the internal thread.

[0006] Furthermore, a sliding bracket is fixedly connected to the rear end of the socket mounting base, and the sliding end of the sliding bracket is sleeved on the guide rod provided in the upper interface of the lower short section; The guide rod is also provided with a limiting platform, and a spring is abutting between the limiting platform and the sliding end of the sliding bracket to prevent over-assembly between the plug assembly and the socket assembly.

[0007] Furthermore, positioning posts are provided on opposite sides of the front end of the guide rod; The sliding end of the sliding bracket is provided with a positioning groove at a position corresponding to the two positioning posts along the axial direction. The positioning posts are located in the positioning grooves. The sliding bracket drives the plug assembly to move back and forth along the axial direction. The positioning posts and positioning grooves cooperate to limit the circumferential rotation and axial displacement of the plug assembly.

[0008] Furthermore, the threaded ring consists of two mutually symmetrical semi-circular threaded rings, and the connecting ends of the two semi-circular threaded rings are connected by bolts and installed in the threaded ring mounting groove. The inner annular surface of the threaded ring can rotate relative to the outer annular surface of the upper interface of the lower sub. The outer annular surface of the threaded ring is provided with an external thread that cooperates with the internal thread, so as to form a threaded connection between the lower interface of the upper sub and the upper interface of the lower sub.

[0009] Furthermore, a keyway is provided on the inner wall of the upper interface of the lower section at a position corresponding to the key.

[0010] Furthermore, the length of the plug fixing groove is not less than the length of the key.

[0011] Furthermore, at least one sealing ring mounting groove is provided on the outer circumference of the upper interface of the lower stub located at the front end of the threaded ring mounting groove. A sealing ring is provided in the sealing ring mounting groove to form a seal after the lower interface of the upper stub is connected to the upper interface of the lower stub.

[0012] Furthermore, two sealing ring mounting grooves are provided on the outer circumference of the upper interface of the lower section.

[0013] Furthermore, an identification line is provided on the outer side of the lower interface of the upper section at the position corresponding to the key positioning groove.

[0014] Furthermore, the outer rear wall of the threaded ring is provided with a mounting hole for inserting a tool.

[0015] The beneficial effects of this utility model are: [1] The present invention provides an ultra-short joint based on keyway mating with strong structural stability and easy assembly. By assembling the plug assembly with the keyway positioning groove of the plug assembly and the keyway of the socket assembly, the mating accuracy of the short joint can be effectively improved, the assembly efficiency and accuracy between two adjacent short joints can be greatly improved, the service life of the short joint can be extended, and the length of the short joint can be effectively shortened, which further improves the connection stability and reliability of the oil well logging instrument.

[0016] [2] This utility model forms a circumferential positioning between the upper short section and the plug assembly by the mutual cooperation between the anti-rotation boss and the plug fixing groove, and forms a circumferential positioning between the upper and lower short sections by the mutual cooperation between the key positioning groove and the key. This effectively prevents the short section connector from rotating during the insertion process, avoids damage to the short section connector, effectively improves the docking accuracy of the short section connector, extends its service life, effectively saves production costs and production resources, and also improves the stability of the connection between adjacent short sections.

[0017] [3] The socket assembly in this utility model can effectively avoid damage to the short section connector caused by excessive assembly between the plug assembly and the socket assembly through the cooperation of the sliding bracket, the spring and the guide rod set in the upper interface of the lower short section. At the same time, it can also ensure proper assembly between the socket and the pin, ensuring that the oil well logging instrument can work normally, stably and continuously.

[0018] [4] This utility model forms a threaded connection between the lower interface of the upper short section and the upper interface of the lower short section through the internal thread and the threaded ring, which effectively improves the stability and reliability of the short section joint connection and improves the connection rigidity between the various short sections.

[0019] [5] By setting a marking line on the outside of the lower interface of the upper section, this utility model can further ensure assembly accuracy and improve assembly efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the short section connection structure between the lower interface of the upper short section and the upper interface of the lower short section in the background art. Figure 2 This is a three-dimensional structural cross-sectional view of an embodiment of the present invention, which is an ultra-short joint based on keyway mating. Figure 3 This is a planar structural cross-sectional view of an embodiment of the present utility model; Figure 4 This is a schematic diagram of the plug assembly and socket assembly in an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the plug assembly and the socket assembly in an embodiment of the present utility model; Figure 6 This is an exploded view of the structure of the upper short section lower interface and plug assembly in an embodiment of this utility model; Figure 7 This is a schematic diagram of the structural combination of the upper interface and socket assembly of the lower short section in an embodiment of this utility model; Figure 8 This is a structural cross-sectional view of the lower interface of the upper subsection and the upper interface of the lower subsection in an embodiment of this utility model; Figure label: 1-Plug assembly, 2-Socket assembly, 3-Upper short section lower interface, 4-Lower short section upper interface, 5-Sealing ring, 6-Plug mounting base, 7-Pin, 8-Key positioning groove, 9-Anti-rotation boss, 10-Plug fixing groove, 11-Socket mounting base, 12-Socket, 13-Key, 14-Internal thread, 15-Threaded ring mounting groove, 16-Threaded ring, 17-Sliding bracket, 18-Guide rod, 19-Limiting platform, 20-Spring, 21-Positioning post, 22-Positioning groove, 23-Sealing ring mounting groove, 24-Keyway. Detailed Implementation

[0021] like Figure 2 and Figure 3 As shown, an ultra-short joint connector based on keyway mating includes an upper short section lower interface 3 and a plug assembly 1 disposed therein, as well as a lower short section upper interface 4 and a socket assembly 2 disposed at its end. like Figures 4 to 6 As shown, the plug assembly 1 includes a plug mounting base 6 and multiple pins 7 disposed in the middle of the plug mounting base 6. A key positioning groove 8 is provided axially on the outer circumferential surface of the plug mounting base 6, and anti-rotation protrusions 9 are provided on both sides of the key positioning groove 8. A plug fixing groove 10 is provided on the inner wall of the lower interface 3 of the upper subsection at a position corresponding to the key positioning groove 8. The plug assembly 1 is engaged in the plug fixing groove 10 by the anti-rotation protrusions 9 on both sides of the key positioning groove 8, which is used to circumferentially position the plug assembly 1 and prevent it from rotating. The length of the plug fixing groove 10 is not less than the length of the key 13. A sliding bracket 17 is fixedly connected to the rear end of the socket mounting base 11. The sliding end of the sliding bracket 17 is sleeved on the guide rod 18 in the upper interface 4 of the lower subsection. A limiting platform 19 is also provided on the guide rod 18. A spring 20 abuts between the limiting platform 19 and the sliding end of the sliding bracket 17 to prevent over-assembly between the plug assembly 1 and the socket assembly 2.

[0022] like Figure 4 and Figure 7As shown, the socket assembly 2 includes a socket mounting base 11 and a plurality of sockets 12 disposed in the middle of the socket mounting base 11 and adapted to a plurality of pins 7; as Figure 5 As shown, a key 13 is provided on the outer circumference of the socket mounting base 11, extending outward along the axial direction, and is adapted to the key positioning groove 8. It is used to form circumferential positioning when the plug assembly 1 and the socket assembly 2 are assembled. A keyway 24 is provided on the inner wall of the upper interface 4 of the lower short section at a position corresponding to the key 13. The length of the keyway 24 is not less than the length of the key 13.

[0023] like Figure 8 As shown, an internal thread 14 is provided on the inner wall of the lower interface 3 of the upper sub-section located at the front end of the plug assembly 1; a threaded ring mounting groove 15 is provided on the outer side of the upper interface 4 of the lower sub-section, and a threaded ring 16 adapted to the internal thread 14 is rotatably installed in the threaded ring mounting groove 15. By adjusting the connection relationship between the threaded ring 16 and the internal thread 14, the assembly relationship between the plug assembly 1 and the socket assembly 2 is adjusted. The threaded ring 16 consists of two mutually symmetrical semi-circular threaded rings. The connecting ends of the two semi-circular threaded rings are connected by bolts and installed in the threaded ring mounting groove 15. The inner ring surface of the threaded ring 16 and the outer ring surface of the upper interface 4 of the lower sub-section can rotate relative to each other. An external thread that mates with the internal thread 14 is provided on the outer ring surface of the threaded ring 16 to form a threaded connection between the lower interface 3 of the upper sub-section and the upper interface 4 of the lower sub-section.

[0024] Positioning posts 21 are provided on opposite sides of the front end of the guide rod 18; positioning grooves 22 are provided at the sliding end of the sliding bracket 17 at positions corresponding to the two positioning posts 21 along the axial direction. After the sliding bracket 17 is sleeved on the guide rod 18, the positioning posts 21 are located in the positioning grooves 22. The sliding bracket 17 drives the plug assembly 1 to move back and forth along the axial direction. The positioning posts 21 and positioning grooves 22 cooperate to limit the circumferential rotation and axial displacement of the plug assembly 1.

[0025] Two sealing ring mounting grooves 23 are provided on the outer circumference of the upper interface 4 of the lower short section located at the front end of the threaded ring mounting groove 15. A sealing ring 5 is provided in the sealing ring mounting groove 23 to form a seal after the lower interface 3 of the upper short section and the upper interface 4 of the lower short section are connected. A marking line is provided on the outer side of the lower interface 3 of the upper short section at the position corresponding to the key positioning groove 8.

Claims

1. An ultra-short joint connector based on keyway mating, comprising an upper short joint lower interface (3) and a plug assembly (1) disposed therein, and a lower short joint upper interface (4) and a socket assembly (2) disposed at its end; characterized in that: The plug assembly (1) includes a plug mounting base (6) and a plurality of pins (7) disposed in the middle of the plug mounting base (6). A key positioning groove (8) is provided axially on the outer circumferential surface of the plug mounting base (6). Anti-rotation bosses (9) are provided on both sides of the key positioning groove (8). A plug fixing groove (10) is provided on the inner wall of the lower interface (3) of the upper short section at a position corresponding to the key positioning groove (8). The plug assembly (1) is engaged in the plug fixing groove (10) by the anti-rotation bosses (9) on both sides of the key positioning groove (8) to form circumferential positioning of the plug assembly (1) and prevent it from rotating. The socket assembly (2) includes a socket mounting base (11) and a plurality of sockets (12) disposed in the middle of the socket mounting base (11) and adapted to a plurality of pins (7); the socket mounting base (11) is provided with a key (13) that is adapted to the key positioning groove (8) extending outward along the axial direction on the outer circumference of the socket mounting base (11) for forming circumferential positioning when the plug assembly (1) and the socket assembly (2) are assembled; An internal thread (14) is provided on the inner wall of the lower interface (3) of the upper short section located at the outer end of the plug assembly (1); a threaded ring mounting groove (15) is provided on the outer side of the upper interface (4) of the lower short section, and a threaded ring (16) adapted to the internal thread (14) is rotatably installed in the threaded ring mounting groove (15). By adjusting the connection relationship between the threaded ring (16) and the internal thread (14), the assembly relationship between the plug assembly (1) and the socket assembly (2) is adjusted.

2. The ultra-short joint based on keyway mating according to claim 1, characterized in that: The rear end of the socket mounting base (11) is fixedly connected to a sliding bracket (17), and the sliding end of the sliding bracket (17) is sleeved on the guide rod (18) provided in the upper interface (4) of the lower short section. The guide rod (18) is also provided with a limiting platform (19), and a spring (20) is abutting between the limiting platform (19) and the sliding end of the sliding bracket (17) to prevent over-assembly between the plug assembly (1) and the socket assembly (2).

3. The ultra-short joint based on keyway mating according to claim 2, characterized in that: Positioning posts (21) are provided on opposite sides of the front end of the guide rod (18). The sliding end of the sliding bracket (17) is provided with a positioning groove (22) at a position corresponding to the two positioning posts (21) along the axial direction. The positioning posts (21) are located in the positioning grooves (22). The sliding bracket (17) drives the plug assembly (1) to move back and forth along the axial direction. The positioning posts (21) and positioning grooves (22) cooperate to limit the circumferential rotation and axial displacement of the plug assembly (1).

4. The ultra-short joint based on keyway mating according to claim 3, characterized in that: The threaded ring (16) consists of two symmetrical semicircular threaded rings. The connecting ends of the two semicircular threaded rings are connected by bolts and installed in the threaded ring mounting groove (15). The inner ring surface of the threaded ring (16) and the outer ring surface of the upper interface (4) of the lower subsection can rotate relative to each other. The outer ring surface of the threaded ring (16) is provided with an external thread that cooperates with the internal thread (14) to form a threaded connection between the lower interface (3) of the upper subsection and the upper interface (4) of the lower subsection.

5. The ultra-short joint based on keyway mating according to claim 4, characterized in that: A keyway (24) is provided on the inner wall of the upper interface (4) of the lower section at the position corresponding to the key (13).

6. The ultra-short joint based on keyway mating according to claim 5, characterized in that: The length of the plug fixing groove (10) is not less than the length of the key (13).

7. The ultra-short joint based on keyway mating according to claim 6, characterized in that: At least one sealing ring mounting groove (23) is provided on the outer circumference of the upper interface (4) of the lower short section located at the front end of the threaded ring mounting groove (15). A sealing ring (5) is provided in the sealing ring mounting groove (23) to form a seal after the lower interface (3) of the upper short section and the upper interface (4) of the lower short section are connected.

8. The ultra-short joint based on keyway mating according to claim 7, characterized in that: Two sealing ring mounting grooves (23) are provided on the outer circumference of the upper interface (4) of the lower section.

9. The ultra-short joint based on keyway mating according to claim 8, characterized in that: The outer side of the lower interface (3) of the upper section is provided with a marking line at the position corresponding to the key positioning groove (8).

10. The ultra-short joint based on keyway mating according to claim 9, characterized in that: The outer rear wall of the threaded ring (16) is provided with a mounting hole for inserting a tool.

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