Perforating gun middle connecting structure

Abstract

A middle connecting structure of a perforating gun comprises a middle connector for connecting two gun bodies, grooves are formed in the two ends of the middle connector, an installation base is arranged in the groove in at least one end of the middle connector, a controller is installed in the installation base, and a first conducting rod which is elastically telescopic is arranged in the installation base. The first end of the first conducting rod is connected with a signal line of the controller, the second conducting rod capable of making contact with the second end of the first conducting rod is arranged in the middle connector, rapid assembly of the perforating gun and the middle connector can be rapidly achieved through the middle connecting structure, and the middle connector and the perforating gun are directly in butt joint; after butt joint is completed, the first conducting rod and the second conducting rod are electrically connected, and the problem of missing connection is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and natural gas excavation, in particular to an intermediate connection structure of a perforating gun. Background Art

[0002] The perforating guns are connected together through intermediate joints to form a perforating gun string. Controlling the detonation of the perforating gun requires transmitting a signal, which is transmitted to the controller through a signal line. The controller controls the electronic detonator based on the received signal. Before assembly, the perforating gun and the intermediate joint are separated. During assembly, the signal line is connected to the controller of the previous perforating gun, and then connected to the controller of the next perforating gun through the intermediate joint. This requires staff to connect one by one on site, and only start assembling after each level of perforating guns are connected in series. This may result in missed connections, poor detonation reliability, and a complicated assembly method that is not convenient enough and has low assembly efficiency. Utility Model Content

[0003] In order to solve the defects of the prior art that connection may be missed and assembly efficiency is low, the utility model provides a middle connection structure of a perforating gun.

[0004] The technical solution of the utility model is: a middle connection structure of a perforating gun, including an middle joint connecting two sections of a gun body, grooves are provided at both ends of the middle joint, a mounting seat is provided in the groove at at least one end of the middle joint, a controller is installed in the mounting seat, an elastically retractable first conductive rod is provided in the mounting seat, a first end of the first conductive rod is connected to a signal line of the controller, and a second conductive rod capable of contacting the second end of the first conductive rod is provided in the middle joint.

[0005] Preferably, the second conductive rod is fixedly arranged on the middle joint.

[0006] Preferably, the second conductive rod comprises a fixed rod which contacts the second end of the first conductive rod and is fixedly arranged at one end of the middle joint, and a movable rod which is movably arranged at the other end of the middle joint and can be elastically retracted, and the fixed rod and the movable rod are electrically connected.

[0007] Preferably, a spring for driving the first conductive rod to elastically expand and contract is provided on the first conductive rod, and a conductive cap cooperating with the spring is also provided on the first conductive rod.

[0008] Preferably, a flange for fixing the mounting seat is provided on the mounting seat.

[0009] The beneficial effects of the utility model include: the intermediate connection structure can be used to quickly realize the rapid assembly of the perforating gun and the intermediate joint, the intermediate joint and the perforating gun are directly docked, and after the docking is completed, the first conductive rod and the second conductive rod are electrically connected without the problem of missing connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 It is a schematic diagram of the intermediate connection structure connected to the tail sealing tool. DETAILED DESCRIPTION

[0012] In order to better understand the concept of the present invention, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] The technical solution of the utility model is as follows: a middle connection structure of a perforating gun, such as Figure 1 As shown, the perforating gun includes a cartridge frame 9 and a gun body 10, including an intermediate joint 1 connecting two sections of the gun body 10, grooves 2 are provided at both ends of the intermediate joint 1, and a mounting seat 3 is provided in the groove 2 at least at one end of the intermediate joint 1. The mounting seat 3 is installed on any one of the upper and lower cartridge frames connected to the perforating guns, or the mounting seats 3 are installed on the cartridge frames of the two perforating guns. Figure 1 As shown in the partial enlarged view, a controller 4 is installed in the mounting seat 3, and an elastically retractable first conductive rod 5 is provided in the mounting seat 3. The first end 5-1 of the first conductive rod 5 is connected to the signal line of the controller 4, and a second conductive rod 6 capable of contacting the second end 5-2 of the first conductive rod 5 is provided in the intermediate joint 1. The purpose of such a setting is that the mounting seat 3 is installed on the bomb rack of the perforating gun, and the controller 4 of the perforating gun is connected to the first conductive rod 5 at the factory. During on-site assembly, the intermediate joint 1 and the perforating gun are directly docked, and the intermediate joint 1 is connected to the gun body 10 by threads. After the docking is completed, the first conductive rod 5 and the second conductive rod 6 are directly in contact, and there is no need to consider the problem of missing connection. In order to prevent the first conductive rod 5 from leaking electricity, the mounting seat 3 is made of insulating material.

[0014] Due to the size of the first conductive rod 5 or the installation position of the first conductive rod 5 during production, there may be errors, resulting in the first conductive rod 5 not being able to contact the second conductive rod 6 or excessive contact, causing damage to the first conductive rod 5. Figure 1 As shown in the partial enlarged view, a spring 7 for driving the first conductive rod 5 to elastically expand and contract is provided on the first conductive rod 5, and a conductive cap 8 cooperating with the spring 7 is also provided on the first conductive rod 5. The first conductive rod 5 realizes elastic expansion and contraction through the spring 7 and the conductive cap 8. When the first conductive rod 5 contacts the second conductive rod 6, the second conductive rod 6 squeezes the first conductive rod 5, so that the first conductive rod 5 moves away from the second conductive rod 6. The spring 7 is compressed to provide support for the first conductive rod 5, so that the first conductive rod 4 moves to a suitable position and maintains stable contact with the second conductive rod 5.

[0015] When the first conductive rod 5 is butted against the second conductive rod 6 , the second conductive rod 6 can contact the first conductive rod 5 through the conductive cap 8 , and a positioning hole for positioning the second conductive rod 6 is provided on the conductive cap 8 .

[0016] When two adjacent perforating guns are connected via an intermediate joint 1, as shown in FIG. Figure 1 As shown, the second conductive rod 6 is fixedly arranged on the middle joint 1 , and in order for the first conductive rod 5 and the second conductive rod 6 to be in contact with each other, both ends of the second conductive rod 6 extend out of the groove 2 of the middle joint 1 .

[0017] When the perforating gun is connected to the tail setting tool through the middle joint 1, the second conductive rod 6 needs to contact the primary gunpowder in the setting tool, so that the second conductive rod 6 applies an electric pulse to detonate the gunpowder. However, there may be errors in the size or installation position of the second conductive rod 6, resulting in the second conductive rod 6 and the gunpowder not being able to contact. In order to make the second conductive rod 6 contact with the gunpowder and keep the contact with the first conductive rod 5 stable, Figure 2 As shown in the partial enlargement, the second conductive rod 6 includes a fixed rod 6-1 which contacts the second end 5-2 of the first conductive rod 5 and is fixedly arranged at one end of the intermediate joint 1, and a movable rod 6-2 which is movably arranged at the other end of the intermediate joint and can be elastically retracted. A guide sleeve 12 which cooperates with the second spring 11 is provided on the movable rod 6-2. The guide sleeve 12 retracts and contracts in the intermediate joint 1 with the movable rod 6-2. When the movable rod 6-2 contacts the gunpowder, the gunpowder squeezes the movable rod 6-2 to move toward the fixed rod 6-1, and the second spring 11 is compressed to provide support for the movable rod 6-2 through the guide sleeve 12. The movable rod 5-2 is positioned at a suitable position to maintain stable contact with the gunpowder. Since the movable rod needs to move toward the fixed rod, there is a gap A between the fixed rod 6-1 and the movable rod 6-2, leaving enough expansion space for the movable rod 6-2. In order to enable the movable rod 6-2 and the fixed rod 6-1 to transmit current without being connected, the fixed rod 6-1 is electrically connected to the movable rod 6-2 through the second spring 11. Generally, the intermediate joint 1 is made of stainless steel. In order to prevent leakage of the movable rod 6-2 and the fixed rod 6-1, an insulating layer 13 is set between the intermediate joint 1 and the second conductive rod 6.

[0018] Since the installation of the mounting seat 3 at the end of the bomb rack increases the length of the perforating gun string, in order to keep the length of the perforating gun string unchanged, as shown in FIG. Figure 1 As shown in the local enlarged part, the groove 2 of the intermediate joint 1 can accommodate the mounting seat 3. The size of the groove 2 is slightly larger than the outer ring of the mounting seat 3. During installation, the groove 2 can limit the radial movement of the mounting seat 3. In order to limit the axial movement of the mounting seat 3, a flange 9 for fixing the mounting seat 3 is provided on the mounting seat 3. The end of the intermediate joint 1 cooperates with the gun body to position the center of the mounting seat 3.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A middle connection structure of a perforating gun, comprising an middle joint (1) connecting two sections of a gun body, grooves (2) being provided at both ends of the middle joint (1), a mounting seat (3) being provided in the groove (2) at at least one end of the middle joint (1), a controller (4) being installed in the mounting seat (3), characterized in that: An elastically retractable first conductive rod (5) is provided in the mounting seat (3); a first end (5-1) of the first conductive rod (5) is connected to a signal line of a controller (4); and a second conductive rod (6) capable of contacting a second end (5-2) of the first conductive rod (5) is provided in the intermediate joint (1).

2. A perforating gun intermediate connection structure according to claim 1, characterized in that: The second conductive rod (6) is fixedly arranged on the middle joint (1).

3. The intermediate connection structure of a perforating gun according to claim 1, characterized in that: The second conductive rod (6) comprises a fixed rod (6-1) which contacts the second end (5-2) of the first conductive rod (5) and is fixedly arranged at one end of the middle joint (1), and a movable rod (6-2) which is movably arranged at the other end of the middle joint and can be elastically retracted, and the fixed rod (6-1) and the movable rod (6-2) are electrically connected.

4. A perforating gun intermediate connection structure according to claim 1, characterized in that: A spring (7) is provided on the first conductive rod (5) for driving the first conductive rod (5) to elastically expand and contract, and a conductive cap (8) cooperating with the spring (7) is also provided on the first conductive rod (5).

5. The intermediate connection structure of a perforating gun according to claim 1, characterized in that: A flange (9) for fixing the mounting seat (3) is provided on the mounting seat (3).

Images