Insulated pressure-bearing plug-in assembly and drill collar structure

Abstract

The application discloses an insulating pressure-bearing plug-in assembly and a drill collar structure. The insulating pressure-bearing plug-in assembly comprises a circuit framework, a pressure-bearing plug and a connecting socket. The pressure-bearing plug comprises a plug main body used for plug-in cooperation with the connecting socket, a plurality of groups of connecting wires connected with the plug main body respectively, and each group of the connecting wires is used for connecting a sensor respectively. A protective shell is made of insulating material and vulcanized and fixed to the connecting end of the plug main body and the connecting wire. The insulating pressure-bearing plug-in assembly can connect more sensors, and facilitates the assembly between the sensor and the drill collar and the disassembly and replacement of the maintenance personnel.

Description

Technical Field

[0001] This invention belongs to the field of oil well logging technology, specifically relating to an insulated pressure-bearing plug-in assembly and a drill collar structure. Background Technology

[0002] Logging while drilling (LOD) instruments measure changes in formation physical properties during drilling. These instruments operate in environments characterized by high temperature, high pressure, and intense vibration. For LOD instruments where sensors are externally mounted on the drill collar surface, ensuring a stable connection between the sensor and the internal circuitry of the drill collar, and guaranteeing the ability to withstand the high temperature and high pressure of the downhole environment, is particularly important.

[0003] The pressure-bearing connector assembly in related technologies typically includes a circuit frame, a pressure-bearing plug, and a connector socket. The circuit frame is mounted on the drill collar, the connector socket is mounted on the circuit frame, and the pressure-bearing plug and connector socket are mated together. In existing technologies, the main body of the pressure-bearing plug is mostly made of metal. The sensor's wires are connected to the pressure-bearing plug via a single-core pressure-bearing connector. The internal wires of the pressure-bearing connector are soldered to the pins of a two-core connector. Finally, the two wires leading from the circuit frame inside the drill collar are directly soldered to the other end of the pins of the two-core connector.

[0004] However, due to space limitations in logging-while-drilling instruments, there is only enough space to accommodate two single-core pressure-bearing connectors, making this solution unsuitable for sensors requiring multi-strand wires. Consequently, the wires within the circuit frame must be soldered to the two-core connector pins in the pressure-bearing plug. This requires soldering or disconnecting the wires during instrument assembly and subsequent maintenance, which is time-consuming and labor-intensive. Summary of the Invention

[0005] In order to solve all or part of the above problems, the present invention aims to provide an insulated pressure-bearing plug-in assembly and a drill collar structure that can connect more sensors and facilitates the assembly between the sensors and the drill collar, as well as the disassembly and replacement by maintenance personnel.

[0006] In a first aspect, the present invention provides an insulated pressure-bearing plug assembly, comprising a circuit frame, a pressure-bearing plug, and a connection socket, wherein the pressure-bearing plug comprises: The plug body is used to be inserted and mated with the connection socket; Multiple sets of connecting wires are provided, each set connected to the plug body, and each set of connecting wires is used to connect to a sensor. The protective shell is made of insulating material and is vulcanized and fixed to the connection end of the plug body and the connecting wire.

[0007] Optionally, the pressure-bearing plug further includes: Multiple sealing glass tubes are tightly fitted onto the corresponding connecting wires, and the protective shell is vulcanized and fixed onto the sealing glass tubes.

[0008] Optionally, the plug body is provided with two guide plates, the connector socket is provided with two guide grooves, and the two guide plates can be tightly engaged into the corresponding guide grooves.

[0009] Optionally, the two guide plates are respectively arc-shaped, and the arc lengths of the two guide plates are different.

[0010] Optionally, a sealing ring is provided on the plug body to ensure a sealing fit between the plug body and the drill collar.

[0011] Optionally, the connection socket includes: The socket body is mounted on the circuit frame and is used to connect and cooperate with the plug body; Two cable trays are symmetrically arranged on the main body of the socket; The two cable trays are respectively formed with the outer edge of the socket body to form the corresponding guide grooves.

[0012] Optionally, the circuit frame is provided with a mounting groove, the socket body is movably disposed in the mounting groove, the bottom of the mounting groove is embedded with an elastic support pad, and the socket body abuts against the support pad. Each of the two cable trays is provided with a limiting block, and a limiting frame is detachably connected to the circuit frame, and the limiting frame is used to press down the two limiting blocks.

[0013] Optionally, the limiting frame is provided with two limiting grooves, and the two limiting blocks are respectively inserted into the corresponding limiting grooves. Each limiting block is provided with a rotating inclined surface on both sides so that the socket body can swing axially.

[0014] In a second aspect, the present invention provides a drill collar structure, including an insulated pressure-bearing plug assembly, and further comprising: The drill collar body has a cylindrical structure, and the circuit frame is fixed inside the drill collar body; Mounting holes are provided on the drill collar body; The pressure-bearing plug is inserted into the mounting hole and engaged with the connection socket, and the pressure-bearing plug is sealed to the drill collar body.

[0015] Optionally, the outer surface of the drill collar body is provided with a wiring groove, and the portion of the pressure-bearing plug located outside the mounting hole and the sensor can be completely inserted into the wiring groove.

[0016] As can be seen from the above technical solutions, the insulating pressure-bearing plug-in assembly and drill collar structure provided by the present invention have the following advantages: The pressure-bearing plug of the insulated pressure-bearing connector has multiple sets of connecting wires, each set of connecting wires is used to connect to the sensor, so that the insulated pressure-bearing connector can connect more sensors, and facilitates the assembly of sensors and drill collars, as well as the disassembly and replacement by maintenance personnel.

[0017] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of the insulated pressure-bearing plug assembly in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the pressure-bearing plug in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the pressure-bearing plug in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the connection socket in Embodiment 1 of the present invention; Figure 5 This is an exploded view of the circuit frame and connection socket in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the drill collar structure in Embodiment 2 of the present invention; Figure 7 This is a cross-sectional view of the drill collar structure in Embodiment 2 of the present invention; Figure 8 for Figure 7 An enlarged schematic diagram of region A in the middle.

[0020] Explanation of reference numerals in the attached figures: 1. Circuit frame; 2. Pressure-bearing plug; 21. Plug body; 22. Connecting wire; 23. Protective shell; 24. Sealing glass tube; 25. Sealing ring; 3. Connecting socket; 31. Socket body; 32. Cable tray; 33. Limiting block; 4. Guide plate; 5. Guide groove; 6. Mounting groove; 7. Support pad; 8. Limiting groove; 9. Rotating inclined plane; 10. Support bar; 11. Fastening screw; 12. Cable tray; 13. Drill collar body; 14. Mounting hole; 15. Wiring tray; 16. Limiting frame. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The illustration shows Embodiment 1 of the present invention, which discloses an insulated pressure-bearing plug assembly, including a circuit frame 1, a pressure-bearing plug 2, and a connecting socket 3. The pressure-bearing plug 2 includes a plug body 21, connecting wires 22, and a protective shell 23. The plug body 21 is used for plugging into the connecting socket 3. Multiple sets of connecting wires 22 are provided, each set connected to the plug body 21, and each set of connecting wires 22 is used to connect a sensor. In this embodiment, the connecting wires 22 at the tail of the pressure-bearing plug 2 can be directly soldered to components such as sensors, or a sealed plug assembly can be used to connect the sensors.

[0023] In this embodiment, the pressure-bearing plug 2 of the insulated pressure-bearing connector assembly has multiple sets of connecting wires 22, each set of connecting wires 22 being used for sensor connection, thereby enabling the insulated pressure-bearing connector assembly to connect more sensors. Compared to the prior art that connects sensors via pressure-bearing connectors, this embodiment facilitates the assembly of sensors and drill collars, as well as the disassembly and replacement by maintenance personnel, improving ease of use.

[0024] In this embodiment, the protective shell 23 is made of insulating material, and the protective shell 23 is vulcanized and fixed to the connection end of the plug body 21 and the connecting wire 22. In this embodiment, the protective shell 23 is preferably made of rubber. At the same time, except for the internal pins, the rest of the plug body 21 is made of insulating materials such as plastic to achieve an insulated connection between the pressure-bearing plug 2 and the drill collar.

[0025] In one embodiment, such as Figure 1 , Figure 2 , Figure 3 As shown, the pressure-bearing plug 2 also includes multiple sealing glass tubes 24, which are tightly fitted onto the corresponding connecting wires 22, and the protective shell 23 is vulcanized and fixed onto the sealing glass tubes 24.

[0026] Because the upper part of the pressure-bearing plug 2 is a rubber vulcanized structure, it achieves a seal between the internal connecting wire 22 and the pin welding structure. At the same time, the internal connecting wire 22 of the vulcanized rubber is equipped with a sealing glass tube 24 of appropriate size, which can enhance its sealing and pressure-bearing capacity, and also achieve insulation between the pressure-bearing plug 2 and the drill collar.

[0027] In one embodiment, such as Figure 2 , Figure 4As shown, the plug body 21 is integrally formed with two guide plates 4, and the connector socket 3 is provided with two guide grooves 5. The two guide plates 4 can be tightly inserted into the corresponding guide grooves 5. At the same time, the two guide plates 4 are arc-shaped and have different arc lengths to ensure the unique orientation of the pressure-bearing plug 2 and the connector socket 3 when connected, and to prevent reverse insertion.

[0028] Since the connector 3 is mounted on the circuit frame 1, and there are errors in the manufacturing and assembly of the circuit frame 1, the connector 3 and its corresponding hole on the drill collar cannot be guaranteed to be perfectly aligned. The guide plate 4 can also serve as an auxiliary guide to ensure that the male pin of the pressure-bearing plug 2 and the female pin of the connector 3 are correctly inserted. In this embodiment, the male pin of the pressure-bearing plug 2 is located in the center of the two guide plates 4, and the number can be defined according to actual needs.

[0029] In one embodiment, such as Figure 2 As shown, a sealing ring 25 is provided on the plug body 21 to ensure a sealing fit between the plug body 21 and the drill collar. In this embodiment, two sealing rings 25 are provided. An annular groove is provided in the middle of the plug body 21. One sealing ring 25 is inserted into the annular groove, and the other sealing ring 25 is located at the bottom of the plug body 21. Both sealing rings 25 can respectively seal with the drill collar.

[0030] In one embodiment, such as Figure 4 As shown, the connector 3 includes a connector body 31 and two cable trays 32. The connector body 31 is mounted on the circuit frame 1 and is used to connect and engage with the plug body 21. The two cable trays 32 are symmetrically arranged on the connector body 31, and corresponding guide grooves 5 are formed between the two cable trays 32 and the outer edge of the connector body 31.

[0031] In one embodiment, such as Figure 4 , Figure 5 As shown, the circuit frame 1 has a mounting groove 6, and the socket body 31 is movably disposed within the mounting groove 6. An elastic support pad 7 is embedded in the bottom of the mounting groove 6, and the socket body 31 abuts against the support pad 7, thereby achieving radial position compensation of the connection socket 3. Two cable trays 32 are each provided with a limiting block 33, and a limiting frame 16 is detachably connected to the circuit frame 1, with the limiting frame 16 used to press down the two limiting blocks 33.

[0032] In one embodiment, such as Figure 4 , Figure 5As shown, the limiting frame 16 is provided with two limiting grooves 8, and two limiting blocks 33 are respectively inserted into the corresponding limiting grooves 8. Each limiting block 33 has a rotating inclined surface 9 on both sides to allow the socket body 31 to swing axially. In this embodiment, the tilt angle of the rotating inclined surface 9 is 15-20°. In other embodiments, it can be adjusted according to the situation.

[0033] The connector 3 and the circuit frame 1 are connected by a gap. When the logging instrument is lowered into the well, the pressure-bearing plug 2 and the connector 3 can swing appropriately under the pulling force of the sensor to offset part of the force, prevent damage to the connector socket, and improve the stability of use. In addition, this design allows the connector 3 to have a certain amount of displacement within the design error range, so as to compensate for the error in the manufacturing and assembly of the circuit frame 1.

[0034] In one embodiment, such as Figure 4 , Figure 5 As shown, support bars 10 are provided on both sides of the mounting groove 6, and the two sides of the limiting frame 16 can abut against the corresponding support bars 10. The two sides of the limiting frame 16 are connected to the corresponding support bars 10 by fastening screws 11.

[0035] In one embodiment, such as Figure 5 As shown, the circuit frame 1 is provided with two wiring grooves 12, which are respectively connected to the mounting groove 6 for the arrangement of external wires and to improve compactness.

[0036] like Figure 6 , Figure 7 , Figure 8 The diagram shows Embodiment 2 of the present invention, which discloses a drill collar structure, including the insulating pressure-bearing plug-in assembly of Embodiment 1, and further including a drill collar body 13 and a mounting hole 14. The drill collar body 13 has a cylindrical structure, and the circuit frame 1 is fixed inside the drill collar body 13. The mounting hole 14 is provided on the drill collar body 13, and the pressure-bearing plug 2 is inserted into the mounting hole 14 and plugged into the connecting socket 3, and the pressure-bearing plug 2 is sealed to the drill collar body 13.

[0037] In this embodiment, the mounting hole 14 is a stepped hole. One of the sealing rings 25 on the plug body 21 can be tightly sealed against the inner wall of the mounting hole 14, and the other sealing ring 25 can be tightly sealed against the stepped surface of the mounting hole 14 to ensure the sealing effect.

[0038] In one embodiment, such as Figure 6 , Figure 7 , Figure 8As shown, the outer surface of the drill collar body 13 is provided with a wiring groove 15, and the pressure-bearing plug 2 is located outside the mounting hole 14 and the sensor can be completely inserted into the wiring groove 15 to improve the structural compactness and also to achieve effective protection of the sensor.

[0039] As can be seen from the above, compared with the prior art, the insulated pressure-bearing plug assembly and drill collar have the following advantages: Because the pressure-bearing plug 2 has a guide plate 4 for guiding, it can compensate for manufacturing and assembly errors of the circuit frame 1 when the pressure-bearing plug 2 is connected to the socket, and it also has the characteristics of ensuring a unique insertion direction and preventing misinsertion. At the same time, the insulated pressure-bearing plug assembly can accommodate not only two connecting wires 22, but the number can be customized according to the usage, providing greater adaptability and allowing operators to connect more sensors. Furthermore, the insulated pressure-bearing plug assembly and drill collar are easy to assemble and disassemble, facilitating the assembly of sensors and drill collars, as well as the disassembly and replacement by maintenance personnel.

[0040] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0041] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0042] 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 therein. 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, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An insulated pressure-bearing plug assembly, comprising a circuit frame (1), a pressure-bearing plug (2), and a connecting socket (3), characterized in that, The pressure-bearing plug (2) includes: The plug body (21) is used to be plugged into the connection socket (3); There are multiple sets of connecting wires (22), each set of which is connected to the plug body (21). Each set of connecting wires (22) is used to connect to the sensor. The protective shell (23) is made of insulating material and is vulcanized and fixed to the connection end of the plug body (21) and the connecting wire (22).

2. The insulated pressure-bearing plug assembly according to claim 1, characterized in that, The pressure-bearing plug (2) also includes: Multiple sealing glass tubes (24) are tightly fitted onto the corresponding connecting wires (22), and the protective shell (23) is vulcanized and fixed onto the sealing glass tubes (24).

3. The insulated pressure-bearing plug assembly according to claim 1, characterized in that, The plug body (21) is provided with two guide plates (4), and the connector socket (3) is provided with two guide grooves (5), and the two guide plates (4) can be tightly inserted into the corresponding guide grooves (5).

4. The insulated pressure-bearing plug assembly according to claim 3, characterized in that, The two guide plates (4) are respectively arc-shaped, and the arc lengths of the two guide plates (4) are different.

5. The insulated pressure-bearing plug assembly according to claim 3, characterized in that, A sealing ring (25) is provided on the plug body (21) so that the plug body (21) and the drill collar are sealed together.

6. The insulated pressure-bearing plug assembly according to claim 3, characterized in that, The connection socket (3) includes: The socket body (31) is disposed on the circuit frame (1) and is used to be plugged into the plug body (21); Two cable trays (32) are symmetrically arranged on the socket body (31); The two cable trays (32) and the outer edge of the socket body (31) respectively form the corresponding guide grooves (5).

7. The insulated pressure-bearing plug assembly according to claim 6, characterized in that, The circuit frame (1) is provided with a mounting groove (6), the socket body (31) is movably disposed in the mounting groove (6), the bottom of the mounting groove (6) is embedded with an elastic support pad (7), and the socket body (31) abuts against the support pad (7). The two cable trays (32) are respectively provided with limit blocks (33), and the circuit frame (1) is detachably connected with a limit frame (16), and the limit frame (16) is used to press down the two limit blocks (33).

8. The insulated pressure-bearing plug assembly according to claim 7, characterized in that, The limiting frame (16) is provided with two limiting grooves (8), and the two limiting blocks (33) are respectively inserted into the corresponding limiting grooves (8). Each limiting block (33) has a rotating inclined surface (9) on both sides so that the socket body (31) can swing axially.

9. A drill collar structure, comprising the insulating pressure-bearing plug assembly as described in any one of claims 1-8, characterized in that, Also includes: The drill collar body (13) has a cylindrical structure, and the circuit frame (1) is fixed inside the drill collar body (13); Mounting hole (14) is provided on the drill collar body (13); The pressure-bearing plug (2) is inserted into the mounting hole (14) and engaged with the connecting socket (3), and the pressure-bearing plug (2) is sealed to the drill collar body (13).

10. The drill collar structure according to claim 9, characterized in that, The outer surface of the drill collar body (13) is provided with a wiring groove (15), and the pressure-bearing plug (2) is located outside the mounting hole (14) and the sensor can be fully inserted into the wiring groove (15).

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