Safety joint for electronic delay perforation of oil and gas well

Abstract

The utility model relates to a safety joint, in particular to a safety joint for electronic delay perforation of an oil and gas well, which comprises an upper joint component, a conductive component, a shearing component and a lower joint component, an upper conductive core-passing piece is arranged in an upper joint body of the upper joint component, and a lower conductive core-passing piece is arranged in a lower joint body of the lower joint component. The conductive assembly is arranged in a conductive assembly containing cavity formed after the upper connector body and the lower connector body are in threaded connection, the upper end of a core passing piece of the conductive assembly is in sliding connection with an upper conductive core passing piece, and a pressure transmitting hole is formed in the upper connector body. When the power supply unit and the perforation unit are connected, pressure is transmitted to the shearing assembly, the power supply unit and the perforation unit are in an open-circuit state before a shearing pin of the shearing assembly is stressed and sheared off, and after the shearing pin is stressed and sheared off, the conductive assembly slides downwards, and the lower end of the core passing piece is connected with the lower conductive core passing piece, so that the power supply unit and the perforation unit are in a closed-circuit state.

Description

A safety connector for electronically delayed perforation in oil and gas wells Technical Field

[0001] This utility model relates to safety connectors, specifically a safety connector for electronic delay perforation in oil and gas wells. Background Technology

[0002] In coiled tubing electronic time-delay cluster perforation operations, the tools to be lowered into the oil and gas well must first be connected sequentially on the surface to form a tool string. The tool string includes a control unit, a power supply unit, and a perforation unit connected sequentially from top to bottom. Before connecting on the surface, the control unit and the power supply unit must be activated. At this time, the power supply unit is in a standby power supply state. If the control unit fails before being lowered into the oil and gas well, the control unit will fail to successfully control the power supply unit to deliver power to the perforation unit. In this state, the perforation unit may detonate on the surface or before reaching the target layer during the well process, which poses a certain safety hazard. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problem that in existing oil and gas well perforation operations, the control unit and power supply unit need to be activated before being lowered into the oil and gas well, which may lead to the perforation unit detonating on the surface or detonating before reaching the target layer during the well process. The invention provides a safety connector for electronic delay perforation of oil and gas wells.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A safety connector for electronically delayed perforation in oil and gas wells, characterized by:

[0006] It includes an upper connector assembly, a conductive assembly, a shearing assembly, and a lower connector assembly;

[0007] The upper connector assembly includes an upper connector body and an upper conductive core component. The upper connector body has an upper core component mounting hole and a first conductive component receiving cavity arranged sequentially from top to bottom in the internal center. The upper conductive core component is disposed in the upper core component mounting hole and is used to connect to the power supply unit. At least one pressure transmission hole is radially opened on the outer wall of the upper connector body corresponding to the first conductive component receiving cavity. The pressure transmission hole is used to connect the external oil and gas well and the first conductive component receiving cavity.

[0008] The lower connector assembly includes a lower connector body and a lower conductive core component. The lower connector body has a second conductive component receiving cavity and a lower conductive core component mounting hole arranged sequentially from top to bottom in the internal center of the lower connector body. The lower conductive core component is disposed in the lower conductive core component mounting hole and is used to connect to the perforation unit.

[0009] The upper connector body and the lower connector body are threadedly connected, and the first conductive component receiving cavity and the second conductive component receiving cavity are mated to form a conductive component receiving cavity; the conductive component is located in the conductive component receiving cavity, and includes an insulating piston and a through core component disposed in the insulating piston. The upper end of the through core component is slidably connected to the upper conductive through core component, and the lower end is disposed corresponding to the mounting hole of the lower through core component. The insulating piston is provided with a pressure-bearing step, and the step surface of the pressure-bearing step is located below the pressure transmission hole.

[0010] The shearing assembly includes an outer shear sleeve, a shear pin, and an inner shear sleeve. The outer shear sleeve is disposed within the cavity of the second conductive assembly and located at the large-diameter end of the first stepped hole opened on the inner wall of the lower connector body. The inner shear sleeve is fixedly sleeved on the insulating piston, and the outer diameter of the inner shear sleeve is smaller than the small-end diameter of the first stepped hole. The shear pin is disposed between the outer shear sleeve and the inner shear sleeve. The shearing assembly is used to connect the lower end of the core component with the lower conductive core component after the shear pin is sheared by force.

[0011] Furthermore, the upper conductive core component includes a first insulating shell, a first contact pin, and a first contact seat. The first insulating shell has a hollow structure and is installed inside the mounting hole of the upper conductive core component, and its outer wall is adapted to the shape of the mounting hole of the upper conductive core component.

[0012] The first contact pin is fixedly disposed at the outer end of the first insulating shell, the first contact seat is slidably disposed inside the first insulating shell, the first contact pin is used to connect with the power supply unit, the first contact pin and the first contact seat are connected by the first conductive spring, and the first contact seat is connected to the upper end of the through core component.

[0013] The lower conductive core component includes a second insulating shell, a second contact pin, and a second contact seat. The second insulating shell has a hollow structure and is installed inside the mounting hole of the lower conductive core component. Its outer wall is adapted to the shape of the mounting hole of the lower conductive core component.

[0014] The second contact pin is fixedly disposed at the outer end of the second insulating shell, and the second contact seat is slidably disposed inside the second insulating shell. The second contact pin is used to connect with the perforation unit. The second contact pin and the second contact seat are connected by a second conductive spring. The second contact seat is used to connect with the lower end of the core component after the shearing pin of the shearing assembly is sheared by force.

[0015] Furthermore, the pressure transmission hole is a threaded hole, and there are two of them. The two pressure transmission holes are arranged opposite each other, and each of them is screwed with a pressure transmission plug. The pressure transmission plug has a central hole through it.

[0016] Furthermore, the insulating piston is provided with an abutment ring, and one side of the inner shear sleeve abuts against the abutment ring. The outer diameter of the inner shear sleeve is smaller than the small end diameter of the first stepped hole and greater than or equal to the outer diameter of the abutment ring.

[0017] Furthermore, a first sealing ring is provided between the insulating piston and the upper connector body.

[0018] Furthermore, both the first and second insulating shells are made of engineering plastics.

[0019] Furthermore, the lower end of the outer wall of the upper connector body is provided with an external thread, and the inner wall of the upper end of the second conductive component receiving cavity of the lower connector body is provided with an internal thread. The upper connector body and the lower connector body are connected by the external thread and the internal thread, and a second sealing ring is provided between the outer wall of the upper connector body and the inner wall of the lower connector body.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] (1) The safety connector for electronic delayed perforation of oil and gas wells provided by this utility model includes an upper connector assembly, a conductive assembly, a shearing assembly and a lower connector assembly. The upper connector body of the upper connector assembly is provided with an upper conductive core, which is used to connect the power supply unit. The lower connector body of the lower connector assembly is provided with a lower conductive core, which is used to connect with the perforation unit. The conductive assembly is located in the conductive assembly receiving cavity formed after the upper connector body and the lower connector body are threadedly connected. The upper end of the core of the conductive assembly is slidably connected to the upper conductive core. A pressure transmission hole is opened on the upper connector body. When the external oil and gas well pressure acts on the conductive assembly through the pressure transmission hole, the pressure will be transmitted to the shearing assembly. Before the shearing pin of the shearing assembly is sheared by force, the power supply unit and the perforation unit are in an open circuit state. When the shearing pin is sheared by force, the conductive assembly slides downward and the lower end of the core is connected to the lower conductive core, thus turning the power supply unit and the perforation unit into a closed circuit state.

[0022] (2) The upper conductive core of the safety connector for electronic delayed perforation of oil and gas wells provided by this utility model realizes the elastic connection between the first contact pin and the first contact seat through the first conductive spring, and the lower conductive core also realizes the elastic connection between the second contact pin and the second contact seat through the second conductive spring, thus ensuring the connection stability.

[0023] (3) The safety connector for electronic delay perforation of oil and gas wells provided by this utility model has a first sealing ring between the insulating piston and the upper connector body, and a second sealing ring between the outer wall of the upper connector body and the inner wall of the lower connector body, which ensures the sealing of the entire connector.

[0024] (4) The shearing component of the safety joint for electronic delayed perforation of oil and gas wells provided by this utility model can be recycled after being sheared by force, and can be reused after replacing the shearing pin, thus saving costs. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the structure of a safety connector for electronic delay perforation of oil and gas wells according to the present invention in the open circuit state.

[0026] Figure 2 is a schematic diagram of the structure of this utility model in the passage state according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the upper connector assembly in an embodiment of this utility model;

[0028] Figure 4 is a schematic diagram of the installation of the shearing component and the conductive component in an embodiment of this utility model;

[0029] Figure 5 is a structural schematic diagram of the lower connector assembly in an embodiment of this utility model.

[0030] The annotations in the attached figures are explained as follows:

[0031] 1-Upper connector assembly, 11-Upper connector body, 12-Upper conductive core component, 121-First insulating shell,

[0032] 122-First contact pin; 123-First contact seat; 13-Pressure transmission plug;

[0033] 2-Conductive component, 21-Insulating piston, 211-Pressure-bearing step, 212-Abutting ring; 22-Pass-through component;

[0034] 3-Shear assembly, 31-Outer shear sleeve, 32-Shear pin, 33-Inner shear sleeve;

[0035] 4-Lower connector assembly, 41-Lower connector body, 42-Lower conductive core, 421-Second insulating shell, 422-Second contact pin, 423-Second contact base;

[0036] 5-First sealing ring, 6-Second sealing ring. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Referring to Figures 1-5, the safety connector for electronic delayed perforation of oil and gas wells according to this utility model includes an upper connector assembly 1, a conductive assembly 2, a shearing assembly 3, and a lower connector assembly 4.

[0039] The structure of the upper connector assembly 1 is shown in Figures 1 and 3. It includes an upper connector body 11 and an upper conductive core 12. The upper connector body 11 is a hollow tubular structure. Its internal center has an upper core mounting hole and a first conductive component receiving cavity arranged sequentially from top to bottom. The upper conductive core 12 is arranged in the upper core mounting hole and is used to connect the power supply unit.

[0040] The upper conductive core 12 includes a first insulating shell 121, a first contact pin 122, and a first contact seat 123. The first insulating shell 121 is made of engineering plastic and has a hollow structure. Its material is corrosion-resistant and high-pressure resistant, and is suitable for the working environment inside oil and gas wells. The first insulating shell 121 is installed in the mounting hole of the upper conductive core, and its outer wall is adapted to the shape of the mounting hole of the upper conductive core. A limiting step is provided at the inner end of the mounting hole of the upper conductive core, and the upper conductive core 12 is limited by the limiting step.

[0041] The first contact pin 122 is fixedly disposed at the outer end of the first insulating shell 121 and is used to connect with the power supply unit. The first contact seat 123 is slidably disposed inside the first insulating shell 121. The first contact pin 122 and the first contact seat 123 are connected by a first conductive spring. This elastic connection does not hinder the sliding of the first contact seat 123 and can ensure the connection between the first contact seat 123 and the first contact pin 122. The structure is simple and stable.

[0042] At least one pressure transmission hole is radially provided on the outer wall of the upper connector body 11 corresponding to the first conductive component receiving cavity. The pressure transmission hole is used to connect the external oil and gas well with the first conductive component receiving cavity. In order to ensure pressure transmission efficiency, two pressure transmission holes are provided and arranged opposite to each other. The pressure transmission holes are threaded holes, and pressure transmission plugs 13 are screwed into them respectively. The center of the pressure transmission plug 13 is provided with a central hole for connecting the external oil and gas well with the first conductive component receiving cavity.

[0043] The structure of the lower connector assembly 4 is shown in Figures 1 and 5. It includes a lower connector body 41 and a lower conductive core 42. The lower connector body 41 is also a hollow tubular structure. Its internal center is provided with a second conductive component receiving cavity and a lower conductive core mounting hole that are connected to each other from top to bottom.

[0044] The lower conductive core 42 is disposed within the lower conductive core mounting hole and includes a second insulating shell 421, a second contact pin 422, and a second contact seat 423. The second insulating shell 421 is a hollow structure and is made of the same material as the first insulating shell 121, both being engineering plastics. The second insulating shell 421 is installed within the lower conductive core mounting hole, and its outer wall is adapted to the shape of the lower conductive core mounting hole. To limit the movement of the second insulating shell 421, a limiting step is provided at the inner end of the lower conductive core mounting hole.

[0045] The second contact pin 422 is fixedly disposed at the outer end of the second insulating housing 421 and is used to connect with the perforation unit, while the second contact seat 423 is slidably disposed inside the second insulating housing 421. The second contact pin 422 and the second contact seat 423 are connected by a second conductive spring.

[0046] The lower end of the outer wall of the upper connector body 11 is provided with an external thread, and the inner wall of the upper end of the second conductive component receiving cavity of the lower connector body 41 is provided with an internal thread. The two are connected by the internal thread and the external thread. A second sealing ring 6 is provided between the outer wall of the upper connector body 11 and the inner wall of the lower connector body 41 to ensure sealing performance. After the two are connected by threads, the first conductive component receiving cavity and the second conductive component receiving cavity are connected to form a conductive component receiving cavity, and the conductive component 2 is disposed in the conductive component receiving cavity.

[0047] The structure of the conductive component 2 is shown in Figure 4. It includes an insulating piston 21 and a through-core component 22 disposed within the insulating piston 21. The upper end of the through-core component 22 is connected to the first contact seat 123, realizing a sliding connection between the upper end of the through-core component 22 and the upper conductive through-core component 12. The lower end of the through-core component 22 is provided corresponding to the mounting hole of the lower through-core component. The through-core component 22 is made of conductive metal material and is wrapped inside the insulating piston 21 to prevent current from being transmitted to the perforation unit through the upper connector body 11 and the lower connector body 41. A first sealing ring 5 is provided directly between the insulating piston 21 and the upper connector body 11 to ensure sealing performance.

[0048] A pressure-bearing step 211 is provided on the insulating piston 21, as shown in Figure 1. The step surface of the pressure-bearing step 211 is located below the pressure transmission hole, so that the pressure from the external oil and gas well will directly act on the step surface of the pressure-bearing step 211 after entering through the pressure transmission hole.

[0049] As shown in Figures 1 and 4, the shearing assembly 3 includes an outer shearing sleeve 31, a shearing pin 32, and an inner shearing sleeve 33. The outer shearing sleeve 31 is disposed within the cavity of the second conductive assembly and located at the large-diameter end of the first stepped hole opened in the inner wall of the lower connector body 41. The inner shearing sleeve 33 is fixedly sleeved on the insulating piston 21. The shearing pin 32 is disposed between the outer shearing sleeve 31 and the inner shearing sleeve 33. The outer diameter of the inner shearing sleeve 33 is smaller than the small-end diameter of the first stepped hole, so that when the shearing pin 32 is sheared by force, the inner shearing sleeve 33 will not be blocked by the first stepped hole as it moves downward with the conductive assembly 2.

[0050] To ensure a high success rate of shearing, an abutment ring 212 is provided on the insulating piston 21. One side of the inner shear sleeve 33 abuts against the abutment ring 212. The outer diameter of the inner shear sleeve 33 is smaller than the small end diameter of the first stepped hole and greater than or equal to the outer diameter of the abutment ring 212. In this way, when the conductive component 2 is subjected to force and moves downward, the abutment ring 212 will push the inner shear sleeve 33 to move. Compared with directly fixing the inner shear sleeve on the insulating piston 21, the stability is higher. After the shearing pin 32 of the shearing component 3 is sheared by force, the core member 22 moves downward and the lower end of the core member 22 abuts against the second contact seat 423.

[0051] In use, the entire connector is in the open circuit state as shown in Figure 1. Then, the connector is connected to the power supply unit and the perforation unit respectively and lowered into the oil and gas well. As the lowering depth in the oil and gas well increases, the pressure on the step surface of the pressure step 211 increases, and the shear pin 32 of the shearing component 3 is sheared. At this time, the conductive component 2 moves downward, and the upper end of the through core 22 of the conductive component 2 drives the first contact seat 123 to move downward. When the lower end of the through core 22 abuts against the second contact seat 423, the entire connector is in the closed circuit state as shown in Figure 2. At this time, the current flows from the power supply unit through the first contact pin 122, the first conductive spring, the first contact seat 123, the through core 22, the second contact seat 423, the second conductive spring, and the second contact pin 422 to the perforation unit.

[0052] The embodiments described above are merely descriptions of specific implementations of this utility model and are not intended to limit the scope of this utility model. Various modifications and improvements made to the technical solutions of this utility model by those skilled in the art without departing from the spirit of this utility model should fall within the protection scope defined by the claims of this utility model.

Claims

1. A safety connector for electronically delayed perforation in oil and gas wells, characterized in that: The assembly includes an upper connector assembly (1), a conductive assembly (2), a shearing assembly (3), and a lower connector assembly (4). The upper connector assembly (1) includes an upper connector body (11) and an upper conductive core (12). The upper connector body (11) has an upper core mounting hole and a first conductive assembly receiving cavity arranged sequentially from top to bottom in the center of its interior. The upper conductive core (12) is disposed in the upper core mounting hole and is used to connect to the power supply unit. The outer wall of the upper connector body (11) has at least one radially formed opening corresponding to the first conductive assembly receiving cavity. A pressure transmission hole is provided to connect an external oil and gas well with the first conductive component receiving cavity; the lower connector assembly (4) includes a lower connector body (41) and a lower conductive core component (42). The lower connector body (41) has a second conductive component receiving cavity and a lower conductive core component mounting hole arranged sequentially from top to bottom in the internal center. The lower conductive core component (42) is installed in the lower conductive core component mounting hole and is used to connect the perforation unit; the upper connector body (11) is threadedly connected to the lower connector body (41), and the first conductive component receiving cavity and the second conductive component receiving cavity are connected. The cavity is formed by the connection of the cavity to form a conductive component receiving cavity; the conductive component (2) is located in the conductive component receiving cavity, and includes an insulating piston (21) and a through core (22) disposed in the insulating piston (21). The upper end of the through core (22) is slidably connected to the upper conductive through core (12), and the lower end is disposed corresponding to the mounting hole of the lower through core. The insulating piston (21) is provided with a pressure-bearing step (211), and the step surface of the pressure-bearing step (211) is located below the pressure transmission hole; the shearing component (3) includes an outer shearing sleeve (31), a shearing pin (32), and an inner shearing sleeve. (33) The outer shear sleeve (31) is disposed in the cavity of the second conductive component and located at the large diameter end of the first stepped hole opened on the inner wall of the lower connector body (41). The inner shear sleeve (33) is fixedly sleeved on the insulating piston (21), and the outer diameter of the inner shear sleeve (33) is smaller than the small end diameter of the first stepped hole. The shear pin (32) is disposed between the outer shear sleeve (31) and the inner shear sleeve (33). The shearing component (3) is used to connect the lower end of the core member (22) with the lower conductive core member (42) after the shear pin (32) is sheared by force.

2. The safety connector for electronic delayed perforation of oil and gas wells according to claim 1, characterized in that: The upper conductive core (12) includes a first insulating shell (121), a first contact pin (122), and a first contact seat (123). The first insulating shell (121) is a hollow structure and is installed in the mounting hole of the upper core, and its outer wall is adapted to the shape of the mounting hole. The first contact pin (122) is fixedly disposed at the outer end of the first insulating shell (121), and the first contact seat (123) is slidably disposed inside the first insulating shell (121). The first contact pin (122) is used to connect with the power supply unit. The first contact pin (122) and the first contact seat (123) are connected by a first conductive spring, and the first contact seat (123) is connected to the upper end of the core (22). The lower conductive core (42) The assembly includes a second insulating shell (421), a second contact pin (422), and a second contact seat (423). The second insulating shell (421) is a hollow structure and is installed in the mounting hole of the lower through core component. Its outer wall is adapted to the shape of the mounting hole of the lower through core component. The second contact pin (422) is fixedly disposed at the outer end of the second insulating shell (421). The second contact seat (423) is slidably disposed in the second insulating shell (421). The second contact pin (422) is used to connect with the perforation unit. The second contact pin (422) and the second contact seat (423) are connected by a second conductive spring. The second contact seat (423) is used to connect with the lower end of the through core component (22) after the shearing pin (32) of the shearing assembly (3) is sheared by force.

3. The safety connector for electronic delayed perforation of oil and gas wells according to claim 2, characterized in that: The pressure transmission hole is a threaded hole, and there are two of them. The two pressure transmission holes are arranged opposite each other, and a pressure transmission plug (13) is screwed into each of them. The pressure transmission plug (13) has a central hole through it.

4. The safety connector for electronically delayed perforation of oil and gas wells according to claim 3, characterized in that: The insulating piston (21) is provided with an abutment ring (212), and one side of the inner shear sleeve (33) abuts against the abutment ring (212). The outer diameter of the inner shear sleeve (33) is smaller than the small end diameter of the first step hole and greater than or equal to the outer diameter of the abutment ring (212).

5. The safety connector for electronically delayed perforation of oil and gas wells according to claim 4, characterized in that: A first sealing ring (5) is provided between the insulating piston (21) and the upper connector body (11).

6. The safety connector for electronically delayed perforation of oil and gas wells according to claim 5, characterized in that: The first insulating shell (121) and the second insulating shell (421) are made of engineering plastic.

7. The safety connector for electronically delayed perforation of oil and gas wells according to claim 1, characterized in that: The lower end of the outer wall of the upper connector body (11) is provided with an external thread, and the inner wall of the upper end of the second conductive component receiving cavity of the lower connector body (41) is provided with an internal thread. The upper connector body (11) and the lower connector body (41) are connected by the external thread and the internal thread, and a second sealing ring (6) is provided between the outer wall of the upper connector body (11) and the inner wall of the lower connector body (41).

Images