Coaxial double-core control joint for perforation of oil and gas well and detection device of coaxial double-core control joint

Abstract

The invention belongs to the field of control joints for oil-gas well perforation, and particularly relates to a coaxial double-core control joint for oil-gas well perforation and a detection device of the coaxial double-core control joint. The joint comprises a joint assembly, a frame body assembly, a single-core pressure-bearing disc and a double-core pressure-bearing disc, the frame body assembly comprises a module frame body, a selective transmitting module, a single-core conductive seat and a double-core conductive seat; the module frame body is mounted in the mounting through hole; the single-core pressure-bearing disc and the double-core pressure-bearing disc are respectively arranged in the joint assembly and are respectively and electrically connected with the single-core conductive seat and the double-core conductive seat; the input end of the selective firing module is electrically connected with an external controller through the double-core conductive seat and the inner core of the double-core pressure-bearing disc in sequence, the ignition end is electrically connected with the external controller through the double-core conductive seat and the outer core of the double-core pressure-bearing disc in sequence, and the output end is electrically connected with an external perforating gun control end through the single-core conductive seat and the single-core pressure-bearing disc in sequence; and the grounding end of the selective transmitting module is connected with the module frame body. The assembly structure is simple, the operation difficulty can be reduced, and the field construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to a coaxial double-core control joint and a detection device thereof, in particular to a coaxial double-core control joint for oil and gas well perforation and a detection device for detecting the joint. Background Art

[0002] With the development of horizontal well pumping perforating technology, the perforation selection process has evolved from mechanical pressure switches to electronic perforating modules.

[0003] In the prior art, a single-connected perforating gun using a side window connector and a selective firing module is usually used. The perforating gun has a complex structure, many disposable consumable parts, and the module cannot be reused. The cost is high, the assembly difficulty coefficient is large, the detection is complex, and the labor intensity is high. During the wiring process, the through-wire may be misconnected, loose, twisted, or squeezed, which affects the assembly quality and has poor timeliness. Therefore, it is difficult to meet actual needs. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems that the existing side window joint and the selective firing module are only connected to the perforating gun, have complex structure, many disposable consumable parts, the selective firing module cannot be reused, the cost is high, and the assembly difficulty coefficient is large, and to provide a coaxial double-core control joint for oil and gas well perforating and a detection device thereof.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A coaxial double-core control joint for oil and gas well perforation, which is special in that:

[0007] It includes a joint assembly, a frame assembly, a single-core pressure plate and a double-core pressure plate;

[0008] The joint assembly comprises a joint body and an inspection hatch cover; the joint body is provided with a mounting through hole along its axial direction, and is provided with an inspection hole connected to the mounting through hole along its radial direction; the inspection hatch cover is installed in the inspection hole and is used to open the inspection hole when inspecting or installing a single-core pressure plate and a double-core pressure plate;

[0009] The frame assembly includes a module frame, a selection module, a single-core conductive seat and a double-core conductive seat;

[0010] The module frame is installed in the installation through hole;

[0011] The selection module is installed in the middle cavity of the module frame, and the single-core conductive seat and the double-core conductive seat are respectively installed at two ends of the module frame;

[0012] The single-core pressure plate and the double-core pressure plate are respectively installed in the installation through holes, and are respectively located on the side away from each other of the single-core conductive seat and the double-core conductive seat, and are respectively electrically connected to the single-core conductive seat and the double-core conductive seat;

[0013] The input end of the firing selection module is electrically connected to an external controller via the double-core conductive seat and the inner core of the double-core pressure plate in sequence, the ignition end is electrically connected to an external controller via the double-core conductive seat and the outer core of the double-core pressure plate in sequence, and the output end is electrically connected to an external perforating gun control end via the single-core conductive seat and the single-core pressure plate in sequence, so as to control the perforating gun to work under the control of the external controller; the grounding end of the firing selection module is connected to the module frame.

[0014] Further, the mounting through hole comprises a first sub-hole, a second sub-hole, a third sub-hole and a fourth sub-hole which are sequentially connected along the axial direction;

[0015] The apertures of the first sub-aperture and the fourth sub-aperture are respectively larger than the apertures of the second sub-aperture and the third sub-aperture, and the aperture of the second sub-aperture is larger than the aperture of the third sub-aperture;

[0016] The inspection hole is connected to the third sub-hole;

[0017] The apertures of the first sub-hole and the fourth sub-hole are adapted to the outer diameters of the double-core pressure plate and the single-core pressure plate, and the inner end surfaces of the double-core pressure plate and the single-core pressure plate abut against the steps between the first sub-hole and the second sub-hole and the steps between the third sub-hole and the fourth sub-hole respectively;

[0018] The aperture of the second sub-hole is adapted to the size of one end of the dual-core conductive seat installed on the module frame, and the aperture of the third sub-hole is adapted to the size of one end of the single-core conductive seat installed on the module frame; the dual-core conductive seat is located in the second sub-hole, and the single-core conductive seat is located in the third sub-hole.

[0019] Furthermore, the module frame includes a connecting plate, and a first column and a second column respectively connected to two ends of the connecting plate;

[0020] The outer diameter of the first column is greater than the outer diameter of the second column, and the connecting plate is an arc-shaped plate, and its outer circumference is flush with the outer circumference of the second column;

[0021] A first mounting hole adapted to the dual-core conductive seat is provided in the first column, and the dual-core conductive seat is installed in the first mounting hole; a second mounting hole adapted to the single-core conductive seat is provided in the second column, and the single-core conductive seat is installed in the second mounting hole;

[0022] The inner wall of the connecting plate and the first column and the second column are close to one end to form the middle cavity, and the hair selection module is installed on the inner wall of the connecting plate.

[0023] Furthermore, the dual-core pressure-bearing disk includes a first conductive shaft, and an inner sintered insulating layer, a first conductive ring, an outer sintered insulating layer and a first pressure-bearing ring which are sequentially sleeved on the first conductive shaft from the inside to the outside;

[0024] The axial dimensions of the inner sintered insulating layer, the first conductive ring, the outer sintered insulating layer and the first pressure-bearing ring are the same and are all smaller than the axial dimension of the first conductive shaft; the first pressure-bearing ring is installed in the installation through hole;

[0025] The dual-core conductive seat comprises an inner insulating sleeve, an outer insulating sleeve, a second conductive shaft, a second conductive ring, a first mounting block, a mounting ring, a first spring and a second spring;

[0026] The first mounting block is fixedly mounted on the end of the inner hole of the inner insulating sleeve away from the double-core pressure plate, the second conductive shaft is slidably mounted on the end of the inner hole of the inner insulating sleeve close to the double-core pressure plate, the first spring is arranged in the inner hole of the inner insulating sleeve, and its two ends are respectively connected to the first mounting block and the second conductive shaft close to one end; the inner hole of the inner insulating sleeve close to the double-core pressure plate is provided with a first step, and in the initial state, the end of the second conductive shaft close to the double-core pressure plate abuts against the first step;

[0027] The mounting ring is sleeved on the outer wall of the inner insulating sleeve away from one end of the double-core pressure plate, the outer insulating sleeve is sleeved on the mounting ring, the second conductive ring is slidably installed in the gap between the inner insulating sleeve and the outer insulating sleeve, and is located close to one end of the double-core pressure plate, the second spring is sleeved on the inner insulating sleeve, and its two ends are respectively connected to the mounting ring and the second conductive ring close to one end; the outer wall of the outer insulating sleeve is installed at the end of the module frame;

[0028] A second step is provided at one end of the inner hole of the outer insulating sleeve close to the double-core pressure plate, and a third step is provided at one end of the outer wall of the second conductive ring away from the double-core pressure plate. In the initial state, the third step abuts against the second step;

[0029] The first conductive shaft and the second conductive shaft are respectively the inner cores of the double-core pressure plate and the double-core conductive seat, the first conductive ring and the second conductive ring are respectively the outer cores of the double-core pressure plate and the double-core conductive seat, the first conductive shaft and the second conductive shaft are correspondingly connected, and the first conductive ring and the second conductive ring are correspondingly connected to form a double conductive path.

[0030] Furthermore, the single-core pressure-bearing disk includes a third conductive shaft, and a sintered insulating layer and a second pressure-bearing ring which are sequentially sleeved on the third conductive shaft from the inside to the outside;

[0031] The axial dimensions of the sintered insulating layer and the second pressure-bearing ring are equal and smaller than the axial dimension of the third conductive shaft; the second pressure-bearing ring is installed in the installation through hole;

[0032] The single-core conductive seat comprises a fourth conductive shaft, a second mounting block, a third spring and an insulating sleeve;

[0033] The fourth conductive shaft is slidably mounted on one end of the inner hole of the insulating sleeve close to the single-core pressure plate, the second mounting block is fixedly mounted on one end of the inner hole of the insulating sleeve away from the single-core pressure plate, the third spring is arranged in the inner hole of the insulating sleeve, and its two ends are respectively connected to the fourth conductive shaft and the second mounting block close to each other;

[0034] A fourth step is provided at one end of the inner hole of the insulating sleeve close to the single-core pressure plate, and in the initial state, one end of the fourth conductive shaft close to the single-core pressure plate abuts against the fourth step;

[0035] The third conductive axis and the fourth conductive axis are connected correspondingly to form a single conductive path.

[0036] Furthermore, the outer walls of the first pressure-bearing ring and the second pressure-bearing ring are both provided with mounting ring grooves, and sealing rings are installed in the mounting ring grooves.

[0037] Furthermore, the first pressure-bearing ring and the second pressure-bearing ring are both made of engineering plastics.

[0038] At the same time, the present invention also provides a detection device for detecting the aforementioned coaxial double-core control joint for oil and gas well perforation, which is special in that:

[0039] Including a detection seat and a double-core detection conductive seat;

[0040] A boss matched with the mounting through hole is provided at one end of the detection seat, a mounting hole matched with the dual-core detection conductive seat is axially provided on the boss, and the dual-core detection conductive seat is installed in the mounting hole for corresponding electrical connection with the dual-core pressure plate during detection;

[0041] Three wire holders are arranged on the detection seat, wherein the inner ends of the connection terminals of two of the wire holders are electrically connected to the inner core and the outer core of the double-core detection conductive seat respectively, the inner end of the connection terminal of the third wire holder is electrically connected to the detection seat, and the outer ends of the connection terminals of the three wire holders and the single-core pressure plate are respectively used to connect to the external detection wires, thereby connecting to the external detector through the detection wires.

[0042] Furthermore, the structure of the dual-core detection conductive seat is the same as the structure of the dual-core conductive seat.

[0043] Furthermore, a connecting groove communicating with the mounting hole is provided at the other end of the detection seat; and three wire seats are evenly arranged along the circumferential direction on the outer circumferential surface of the detection seat at the connecting groove.

[0044] The beneficial effects of the present invention are:

[0045] 1. The present invention pre-installs the selection module on the frame, and the two ends of the frame are respectively equipped with a double-core conductive seat and a single-core conductive seat, and the frame assembly is installed in the joint. The two ends of the joint are correspondingly equipped with a double-core pressure plate and a single-core pressure plate, and a rigid needle and an elastic seat contact connection design is used. The assembly structure is simple, the operation difficulty and labor intensity are reduced, the module can be reused, the operation cost is reduced, and the on-site construction efficiency is improved.

[0046] 2. The present invention can quickly connect the detection line through the wire holder to achieve quick connection with the detector. Compared with the existing detection method that requires four detection lines to be connected to four different positions, the present invention connects three of the detection lines to the wire holder of the detection holder. Only one detection line needs to be connected to the single-core pressure plate. The detection is more convenient, quicker, more efficient, and the connection reliability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of an embodiment of a coaxial double-core control joint for oil and gas well perforation of the present invention;

[0048] Figure 2 It is a structural schematic diagram of a frame assembly in an embodiment of a coaxial double-core control joint for oil and gas well perforation of the present invention;

[0049] Figure 3 It is a structural schematic diagram of a double-core pressure plate in an embodiment of a coaxial double-core control joint for oil and gas well perforation of the present invention;

[0050] Figure 4 It is a structural schematic diagram of a single-core pressure plate in an embodiment of a coaxial double-core control joint for oil and gas well perforation of the present invention;

[0051] Figure 5 The present invention is a schematic structural diagram of a coaxial double-core control joint for oil and gas well perforation and a detection device thereof.

[0052] In the figure: 1-connector assembly, 11-connector body, 111-first sub-hole, 112-second sub-hole, 113-third sub-hole, 114-fourth sub-hole; 12-inspection hatch, 2-frame assembly, 21-module frame, 211-connecting plate, 212-first column, 213-second column; 22-selection module, 23-single-core conductive seat, 231-fourth conductive shaft, 232-second mounting block, 233-third spring, 234-insulating sleeve; 24-dual-core conductive seat, 241-inner insulating sleeve, 242-outer insulating sleeve Insulating sleeve, 243-second conductive shaft, 244-second conductive ring, 245-first mounting block, 246-mounting ring, 247-first spring, 248-second spring; 3-single-core pressure plate, 31-third conductive shaft, 32-sintered insulating layer, 33-second pressure ring; 4-dual-core pressure plate, 41-first conductive shaft, 42-inner sintered insulating layer, 43-first conductive ring, 44-outer sintered insulating layer, 45-first pressure ring; 5-sealing ring, 6-detection seat, 7-dual-core detection conductive seat, 8-wire seat, 9-connecting groove. DETAILED DESCRIPTION

[0053] In order to make the purpose, advantages and features of the present invention more clear, the coaxial dual-core control joint for oil and gas well perforation and its detection device proposed by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the present invention will be more clear.

[0054] See also Figure 1 The present embodiment is a coaxial double-core control joint for oil and gas well perforation, which mainly includes a joint assembly 1, a frame assembly 2, a single-core pressure plate 3 and a double-core pressure plate 4.

[0055] The joint assembly 1 includes a joint body 11 and an inspection hatch 12. The joint body 11 is processed by heat treatment and rust prevention of forging materials to ensure good performance. The joint body 11 is provided with a mounting through hole along its axial direction and an inspection hole connected to the mounting through hole along its radial direction. Specifically, the installation through hole includes a first sub-hole 111, a second sub-hole 112, a third sub-hole 113 and a fourth sub-hole 114 which are connected in sequence along the axial direction; the apertures of the first sub-hole 111 and the fourth sub-hole 114 are the same and larger than the apertures of the second sub-hole 112 and the third sub-hole 113, and the aperture of the second sub-hole 112 is larger than the aperture of the third sub-hole 113; the inspection hole is connected with the third sub-hole 113; the inspection hatch 12 is installed in the inspection hole, and the hatch cover needs to be opened when inspection is required or the pressure plate is installed. Since a sealing ring 5 is installed on the pressure plate, when the pressure plates are installed at both ends of the joint body 11, the gas in the joint body 11 needs to be discharged before it can be installed in place. Otherwise, improper installation will affect the contact of the contacts and the conduction. After the pressure plate is installed in place or the inspection is completed, the inspection hatch cover 12 is installed in place.

[0056] See also Figure 1 and Figure 2 The frame assembly 2 in this embodiment mainly includes a module frame 21, a selection module 22, a single-core conductive seat 23 and a double-core conductive seat 24.

[0057] Specifically, for ease of description, in this embodiment, the module frame 21 is divided into a connecting plate 211, and a first column 212 and a second column 213 that are integrally connected to both ends of the connecting plate 211. The connecting plate 211, the first column 212 and the second column 213 are all made of stainless steel, and can provide installation positions for the subsequent selection module 22, the single-core conductive seat 23 and the double-core conductive seat 24.

[0058] The outer diameter of the first cylinder 212 is greater than the outer diameter of the second cylinder 213, the connecting plate 211 is an arc-shaped plate, the outer diameter of the first cylinder 212 is adapted to the aperture of the second sub-hole 112, the outer diameter of the second cylinder 213 is adapted to the aperture of the third sub-hole 113, the first cylinder 212 and the second cylinder 213 are respectively arranged in the second sub-hole 112 and the third sub-hole 113, the outer peripheral surface of the first cylinder 212 is flush with the outer peripheral surface of the second cylinder 213, and a radial gap is provided between the outer peripheral surface of the first cylinder 212. A first mounting hole compatible with the dual-core conductive seat 24 is provided in the first column 212, and the dual-core conductive seat 24 is installed in the first mounting hole; a second mounting hole compatible with the single-core conductive seat 23 is provided in the second column 213, and the single-core conductive seat 23 is installed in the second mounting hole; the inner wall of the connecting plate 211 and the first column 212 and the second column 213 are close to one end to form a middle cavity, and the selection module 22 is installed on the inner wall of the connecting plate 211.

[0059] More specifically, the dual-core conductive seat 24 includes an inner insulating sleeve 241, an outer insulating sleeve 242, a second conductive shaft 243, a second conductive ring 244, a first mounting block 245, a mounting ring 246, a first spring 247, and a second spring 248. The second conductive shaft 243 and the second conductive ring 244 are both made of stainless steel, and the inner insulating sleeve 241 and the outer insulating sleeve 242 are both made of engineering plastics with good insulation performance and a certain strength.

[0060] The first mounting block 245 is fixedly mounted on one end of the inner hole of the inner insulating sleeve 241, and the second conductive shaft 243 is slidably mounted on the other end of the inner hole of the inner insulating sleeve 241. The first spring 247 is arranged in the inner hole of the inner insulating sleeve 241, and its two ends are respectively connected to the first mounting block 245 and the second conductive shaft 243 close to one end; and a first step is arranged at one end of the inner hole of the inner insulating sleeve 241 close to the double-core pressure disk 4. In the initial state, one end of the second conductive shaft 243 close to the double-core pressure disk 4 abuts against the first step, so that the second conductive shaft 243 will not be pushed out of the inner insulating sleeve 241 due to the spring force.

[0061] The mounting ring 246 is sleeved on one end of the outer wall of the inner insulating sleeve 241, the outer insulating sleeve 242 is sleeved on the mounting ring 246, the second conductive ring 244 is slidably installed in the gap between the inner insulating sleeve 241 and the outer insulating sleeve 242, the second spring 248 is sleeved on the inner insulating sleeve 241, and its two ends are respectively connected to the mounting ring 246 and the second conductive ring 244 close to one end; the outer wall of the outer insulating sleeve 242 is installed at the end of the module frame 21; a second step is provided at one end of the inner hole of the outer insulating sleeve 242, and a third step is provided at one end of the outer wall of the second conductive ring 244. In the initial state, the third step abuts against the second step, so that the second conductive ring 244 will not be pushed out of the outer insulating sleeve 242 due to the spring force.

[0062] The single-core conductive seat 23 specifically includes a fourth conductive shaft 231, a second mounting block 232, a third spring 233 and an insulating sleeve 234. The fourth conductive shaft 231 is made of stainless steel, and the insulating sleeve 234 is made of engineering plastics.

[0063] The fourth conductive shaft 231 is slidably installed at one end of the inner hole of the insulating sleeve 234, the second mounting block 232 is fixedly installed at one end of the inner hole of the insulating sleeve 234, and the third spring 233 is arranged in the inner hole of the insulating sleeve 234, and its two ends are respectively connected to the fourth conductive shaft 231 and the second mounting block 232 close to each other on one side; a fourth step is arranged at one end of the inner hole of the insulating sleeve 234, and in the initial state, the fourth conductive shaft 231 is close to the end of the single-core pressure plate 3 and abuts against the fourth step, so that the fourth conductive shaft 231 will not be pushed out of the insulating sleeve 234 due to the spring thrust.

[0064] The single-core pressure plate 3 and the double-core pressure plate 4 are respectively installed in the installation through holes, and are respectively located on the side away from the single-core conductive seat 23 and the double-core conductive seat 24, and are respectively electrically connected to the single-core conductive seat 23 and the double-core conductive seat 24.

[0065] For details, see Figure 4 The single-core pressure plate 3 is made of a third conductive shaft 31, and a sintered insulating layer 32 and a second pressure ring 33 which are sequentially mounted on the third conductive shaft 31 from the inside to the outside. The insulating sintered material has good insulation performance and impact resistance, and can resist the explosion impact to protect the frame assembly 2. The second pressure ring 33 is made of engineering plastic, and the third conductive shaft 31 is made of stainless steel. The axial dimensions of the sintered insulating layer 32 and the second pressure ring 33 are equal, and are both smaller than the axial dimensions of the third conductive shaft 31, so that both ends of the third conductive shaft 31 protrude from the sintered insulating layer 32, which is convenient for subsequent connection; the second pressure ring 33 is installed in the installation through hole, and a plurality of installation ring grooves are provided on the outer peripheral surface of the second pressure ring 33, and a sealing ring 5 is provided in the installation ring groove to ensure sealing. The third conductive shaft 31 and the fourth conductive shaft 231 are connected correspondingly to form a single conductive path.

[0066] Preferably, an inner groove is provided on the end surface where the fourth conductive shaft 231 is connected to the third conductive shaft 31, so as to ensure the reliability of the connection.

[0067] See also Figure 3 The double-core pressure plate 4 is formed by sintering a first conductive shaft 41, an inner sintered insulating layer 42, a first conductive ring 43, an outer sintered insulating layer 44 and a first pressure ring 45 which are sequentially sleeved on the first conductive shaft 41 from the inside to the outside. The insulating sintered material has good insulation performance and impact resistance, and can resist explosion impact to protect the frame assembly 2. The first pressure ring 45 is made of engineering plastics, and the first conductive shaft 41 and the first conductive ring 43 are made of stainless steel. The axial dimensions of the inner sintered insulating layer 42, the first conductive ring 43, the outer sintered insulating layer 44 and the first pressure ring 45 are the same and are all smaller than the axial dimension of the first conductive shaft 41; the first pressure ring 45 is installed in the installation through hole, and the outer peripheral surface of the first pressure ring 45 is also provided with a plurality of installation ring grooves, and a sealing ring 5 is provided in the installation ring groove to ensure the sealing; the first conductive shaft 41 and the second conductive shaft 243 are respectively the inner cores of the double-core pressure disk 4 and the double-core conductive seat 24, the first conductive ring 43 and the second conductive ring 244 are respectively the outer cores of the double-core pressure disk 4 and the double-core conductive seat 24, the first conductive shaft 41 and the second conductive shaft 243 are correspondingly connected, and the first conductive ring 43 and the second conductive ring 244 are correspondingly connected to form a double conductive path.

[0068] Preferably, an inner groove is provided on the end surface where the second conductive shaft 243 is connected to the first conductive shaft 41 , so as to ensure the reliability of the connection.

[0069] The input end of the firing selection module 22 is electrically connected to an external controller via the double-core conductive seat 24 and the inner core of the double-core pressure plate 4 in sequence, the ignition end is electrically connected to an external controller via the double-core conductive seat 24 and the outer core of the double-core pressure plate 4 in sequence, and the output end is electrically connected to an external perforating gun control end via the single-core conductive seat 23 and the single-core pressure plate 3 in sequence, so as to control the perforating gun to work under the control of the external controller; the grounding end of the firing selection module 22 is connected to the module frame 21.

[0070] See also Figure 5 In order to quickly detect the above-mentioned coaxial dual-core control joint for oil and gas well perforation, this embodiment also provides a detection device, which mainly includes a detection seat 6 and a dual-core detection conductive seat 7.

[0071] A boss matched with the mounting through hole is provided at one end of the detection seat 6, and a mounting hole matched with the dual-core detection conductive seat 7 is axially provided on the boss. The dual-core detection conductive seat 7 is installed in the mounting hole for corresponding electrical connection with the dual-core pressure plate 4 during detection.

[0072] Specifically, the structure of the dual-core detection conductive seat 7 in the present device is the same as the structure of the aforementioned dual-core conductive seat 24 ( Figure 5 The spring is not shown in the figure and will not be described in detail here.

[0073] Three wire seats 8 are arranged on the detection seat 6, and a connection groove 9 connected to the mounting hole is arranged at the other end of the detection seat 6; the three wire seats 8 are evenly arranged on the outer peripheral surface of the detection seat 6 at the connection groove 9 along the circumferential direction. The connection terminals of two of the wire seats 8 are electrically connected to the inner core and the outer core of the double-core detection conductive seat 7, respectively, and the connection terminal of the third wire seat 8 is electrically connected to the detection seat 6. The plug-in terminals of the three wire seats 8 and the single-core pressure plate 3 are respectively connected to the external detection line through the plug-in connector, so as to be connected to the external detector through the detection line, so as to realize the rapid detection of the joint.

Claims

1. A coaxial dual-core control joint for oil and gas well perforation, characterized by: It comprises a joint assembly (1), a frame assembly (2), a single-core pressure plate (3) and a double-core pressure plate (4); The joint assembly (1) comprises a joint body (11) and an inspection hatch (12); the joint body (11) is provided with a mounting through hole along its axial direction, and is provided with an inspection hole connected to the mounting through hole along its radial direction; the inspection hatch (12) is installed in the inspection hole and is used to open the inspection hole when inspecting or installing the single-core pressure plate (3) and the double-core pressure plate (4); The frame assembly (2) includes a module frame (21), a selection module (22), a single-core conductive seat (23) and a double-core conductive seat (24); The module frame (21) is installed in the installation through hole; The selection module (22) is installed in the middle cavity of the module frame (21), and the single-core conductive seat (23) and the double-core conductive seat (24) are respectively installed at two ends of the module frame (21); The single-core pressure plate (3) and the double-core pressure plate (4) are respectively installed in the installation through-holes, and are respectively located on the side away from each other of the single-core conductive seat (23) and the double-core conductive seat (24), and are electrically connected to the single-core conductive seat (23) and the double-core conductive seat (24) respectively; The input end of the firing selection module (22) is electrically connected to an external controller via the double-core conductive seat (24) and the inner core of the double-core pressure plate (4), the ignition end is electrically connected to the external controller via the double-core conductive seat (24) and the outer core of the double-core pressure plate (4), and the output end is electrically connected to an external perforating gun control end via the single-core conductive seat (23) and the single-core pressure plate (3), so as to control the perforating gun to work under the control of the external controller; the grounding end of the firing selection module (22) is connected to the module frame (21).

2. The coaxial dual-core control joint for oil and gas well perforation according to claim 1, characterized in that: The mounting through hole comprises a first sub-hole (111), a second sub-hole (112), a third sub-hole (113) and a fourth sub-hole (114) which are sequentially connected along the axial direction; The apertures of the first sub-hole (111) and the fourth sub-hole (114) are respectively larger than the apertures of the second sub-hole (112) and the third sub-hole (113), and the aperture of the second sub-hole (112) is larger than the aperture of the third sub-hole (113); The inspection hole is connected to the third sub-hole (113); The apertures of the first sub-hole (111) and the fourth sub-hole (114) are respectively adapted to the outer diameters of the double-core pressure disc (4) and the single-core pressure disc (3); the inner end surfaces of the double-core pressure disc (4) and the single-core pressure disc (3) are respectively in contact with the step between the first sub-hole (111) and the second sub-hole (112) and the step between the third sub-hole (113) and the fourth sub-hole (114); The aperture of the second sub-hole (112) is adapted to the size of one end of the module frame (21) on which the dual-core conductive seat (24) is installed, and the aperture of the third sub-hole (113) is adapted to the size of one end of the module frame (21) on which the single-core conductive seat (23) is installed; the dual-core conductive seat (24) is located in the second sub-hole (112), and the single-core conductive seat (23) is located in the third sub-hole (113).

3. The coaxial dual-core control joint for oil and gas well perforation according to claim 2, characterized in that: The module frame (21) comprises a connecting plate (211), and a first column (212) and a second column (213) respectively connected to two ends of the connecting plate (211); The outer diameter of the first column (212) is greater than the outer diameter of the second column (213); the connecting plate (211) is an arc-shaped plate, and its outer peripheral surface is flush with the outer peripheral surface of the second column (213); A first mounting hole adapted to the dual-core conductive seat (24) is provided in the first column (212), and the dual-core conductive seat (24) is installed in the first mounting hole; a second mounting hole adapted to the single-core conductive seat (23) is provided in the second column (213), and the single-core conductive seat (23) is installed in the second mounting hole; The inner wall of the connecting plate (211), the first column (212) and the second column (213) are close to one end to form the middle cavity, and the hair selection module (22) is installed on the inner wall of the connecting plate (211).

4. A coaxial dual-core control joint for oil and gas well perforation according to any one of claims 1 to 3, characterized in that: The dual-core pressure-bearing disk (4) comprises a first conductive shaft (41), and an inner sintered insulating layer (42), a first conductive ring (43), an outer sintered insulating layer (44), and a first pressure-bearing ring (45) sequentially sleeved on the first conductive shaft (41) from the inside to the outside; The inner sintered insulating layer (42), the first conductive ring (43), the outer sintered insulating layer (44) and the first pressure-bearing ring (45) have the same axial dimensions and are all smaller than the axial dimensions of the first conductive shaft (41); the first pressure-bearing ring (45) is installed in the installation through hole; The dual-core conductive seat (24) comprises an inner insulating sleeve (241), an outer insulating sleeve (242), a second conductive shaft (243), a second conductive ring (244), a first mounting block (245), a mounting ring (246), a first spring (247) and a second spring (248); The first mounting block (245) is fixedly mounted on the inner hole of the inner insulating sleeve (241) at one end away from the double-core pressure disc (4); the second conductive shaft (243) is slidably mounted on the inner hole of the inner insulating sleeve (241) at one end close to the double-core pressure disc (4); the first spring (247) is arranged in the inner hole of the inner insulating sleeve (241), and its two ends are respectively connected to the first mounting block (245) and the second conductive shaft (243) at one end close to each other; the inner hole of the inner insulating sleeve (241) is provided with a first step at one end close to the double-core pressure disc (4); in the initial state, the second conductive shaft (243) is abutted against the first step at one end close to the double-core pressure disc (4); The mounting ring (246) is sleeved on the outer wall of the inner insulating sleeve (241) away from one end of the dual-core pressure plate (4); the outer insulating sleeve (242) is sleeved on the mounting ring (246); the second conductive ring (244) is slidably mounted in the gap between the inner insulating sleeve (241) and the outer insulating sleeve (242) and is located close to one end of the dual-core pressure plate (4); the second spring (248) is sleeved on the inner insulating sleeve (241), and its two ends are respectively connected to the mounting ring (246) and the second conductive ring (244) close to one end; the outer wall of the outer insulating sleeve (242) is mounted on the end of the module frame (21); The inner hole of the outer insulating sleeve (242) is provided with a second step near one end of the dual-core pressure plate (4), and the outer wall of the second conductive ring (244) is provided with a third step away from one end of the dual-core pressure plate (4), and in the initial state, the third step abuts against the second step; The first conductive shaft (41) and the second conductive shaft (243) are respectively the inner cores of the double-core pressure disc (4) and the double-core conductive seat (24); the first conductive ring (43) and the second conductive ring (244) are respectively the outer cores of the double-core pressure disc (4) and the double-core conductive seat (24); the first conductive shaft (41) and the second conductive shaft (243) are correspondingly connected, and the first conductive ring (43) and the second conductive ring (244) are correspondingly connected, forming a double conductive path.

5. The coaxial dual-core control joint for oil and gas well perforation according to claim 4, characterized in that: The single-core pressure-bearing disk (3) comprises a third conductive shaft (31), and a sintered insulating layer (32) and a second pressure-bearing ring (33) sequentially sleeved on the third conductive shaft (31) from the inside to the outside; The axial dimensions of the sintered insulating layer (32) and the second pressure-bearing ring (33) are equal and both are smaller than the axial dimension of the third conductive shaft (31); the second pressure-bearing ring (33) is installed in the installation through hole; The single-core conductive seat (23) comprises a fourth conductive shaft (231), a second mounting block (232), a third spring (233) and an insulating sleeve (234); The fourth conductive shaft (231) is slidably mounted on the inner hole of the insulating sleeve (234) near one end of the single-core pressure plate (3), the second mounting block (232) is fixedly mounted on the inner hole of the insulating sleeve (234) away from one end of the single-core pressure plate (3), and the third spring (233) is arranged in the inner hole of the insulating sleeve (234), and its two ends are respectively connected to the fourth conductive shaft (231) and the second mounting block (232) near one side. The inner hole of the insulating sleeve (234) is provided with a fourth step near one end of the single-core pressure disc (3), and in the initial state, the fourth conductive shaft (231) is in contact with the fourth step near one end of the single-core pressure disc (3); The third conductive axis (31) and the fourth conductive axis (231) are correspondingly connected to form a single conductive path.

6. The coaxial dual-core control joint for oil and gas well perforation according to claim 5, characterized in that: The outer walls of the first pressure-bearing ring (45) and the second pressure-bearing ring (33) are both provided with mounting ring grooves, and sealing rings (5) are installed in the mounting ring grooves.

7. The coaxial dual-core control joint for oil and gas well perforation according to claim 6, characterized in that: The first pressure-bearing ring (45) and the second pressure-bearing ring (33) are both made of engineering plastics.

8. A detection device for detecting a coaxial dual-core control joint for oil and gas well perforation according to any one of claims 1 to 7, characterized in that: It comprises a detection seat (6) and a dual-core detection conductive seat (7); One end of the detection seat (6) is provided with a boss adapted to the mounting through hole, and an installation hole adapted to the dual-core detection conductive seat (7) is provided on the boss along the axial direction. The dual-core detection conductive seat (7) is installed in the installation hole and is used for corresponding electrical connection with the dual-core pressure plate (4) during detection; The detection seat (6) is provided with three wire seats (8), wherein the inner ends of the connection terminals of two wire seats (8) are electrically connected to the inner core and the outer core of the double-core detection conductive seat (7), respectively, and the inner end of the connection terminal of the third wire seat (8) is electrically connected to the detection seat (6). The outer ends of the connection terminals of the three wire seats (8) and the single-core pressure plate (3) are respectively used to connect to external detection wires, thereby connecting to an external detector through the detection wires.

9. A detection device according to claim 8, characterized in that: The structure of the dual-core detection conductive seat (7) is the same as that of the dual-core conductive seat (24).

10. A detection device according to claim 8 or 9, characterized in that: The other end of the detection seat (6) is provided with a connection groove (9) connected to the mounting hole; three wire seats (8) are evenly distributed along the circumferential direction on the outer peripheral surface of the detection seat (6) located at the connection groove (9).

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