A pumping graded perforating selector protection device

Abstract

The present invention belongs to the technical field of oil and gas well completion, and specifically relates to a pumping graded perforating selector protection device. It includes a perforating gun and an efficient selector intermediate joint, which is detachably connected to the perforating gun, and includes a joint body, a selector module chip is arranged at the center of the joint body, a second contact pin assembly is arranged at one end of the joint body, and a sealing baffle assembly is installed at the other end. A bomb rack front seat and a bomb rack rear seat are installed in the perforating gun through a bearing seat and a bearing, a bomb rack is installed between the bomb rack front seat and the bomb rack rear seat, a first contact pin assembly is installed on the bomb rack front seat, an insulating seat assembly is installed at one end of the bomb rack rear seat away from the bomb rack front seat, a perforating bullet and a detonator are installed in the bomb rack, and a detonating cord is wound outside the bomb rack. The present invention can not only realize reliable electrical connection between adjacent perforating guns, but also play a role of temperature resistance, pressure resistance and reliable sealing, and can effectively isolate the high pressure generated by the explosion of the perforating gun to avoid affecting adjacent perforating guns.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas well completion, and in particular relates to a pumping graded perforating selector protection device. Background Art

[0002] After drilling and cementing in oil and gas fields, perforation is required. Perforation is an operation that uses special energy-gathering equipment to enter the predetermined layer of the wellbore to explosively open holes, allowing the fluid in the underground formation to enter the hole. Thin oil layers and fractured reservoirs often use special wells such as high-angle wells and horizontal wells, especially shale oil, coalbed methane, ultra-low permeability tight oil and gas, which require precise directional perforation and hydraulic fracturing to obtain production capacity. At present, since shale oil reservoirs are mostly horizontal, the reservoirs are dispersed and have a large distribution range, in order to save costs, it is necessary to lower the multi-cluster perforating gun strings for all reservoirs of a well into the well at one time, and then implement cluster perforation, and detonate the perforating guns of the corresponding reservoirs respectively. Cluster perforation is an important process for supporting segmented fracturing and perforating completion. Composite bridge plugs are used to segment the target layer of the oil and gas well, and each segment is divided into several clusters. Cable transmission or pump pressure transmission, the perforating gun string and composite bridge plug are transported to the target layer at one time, and the bridge plug setting and multi-cluster perforation operations are completed one by one.

[0003] However, in actual production, the underground working conditions are high in temperature and pressure. It is usually difficult to ensure the insulation, reliable sealing and reliable electrical connection of the device while achieving ignition control at all levels.

[0004] Therefore, how to provide a clustering and selecting chip device that can not only ensure reliable electrical connection between adjacent perforating guns but also can be repeatedly used is one of the technical problems that urgently need to be solved in this field. Summary of the invention

[0005] Based on the above problems existing in the prior art, the present invention provides a pumping graded perforating selector protection device, and specifically discloses the following technical solutions:

[0006] A pumping graded perforating selector protection device comprises a perforating gun and a high-efficiency selective firing intermediate joint, wherein the high-efficiency selective firing intermediate joint is detachably connected to the perforating gun, the high-efficiency selective firing intermediate joint comprises a joint body, a selective firing module chip is arranged at the center of the joint body, a second contact pin assembly is arranged at one end of the joint body, the second contact pin assembly is fixed in the joint body through a second gland, and a sealing baffle assembly is installed at the other end, bearing seats are arranged at both ends of the inner cavity of the perforating gun, a bomb rack front seat and a bomb rack rear seat are respectively installed on the bearing seats through bearings, a bomb rack is installed between the bomb rack front seat and the bomb rack rear seat, a first contact pin assembly is installed on the bomb rack front seat, an insulating seat assembly is installed at one end of the bomb rack rear seat away from the bomb rack front seat, a perforating bomb and a detonator are installed in the bomb rack, a detonating cord is wound around the bomb rack, and the selective firing module chip is electrically connected to the next level protection device, the detonator positive electrode, the detonator negative electrode, the high-efficiency selective firing intermediate joint shell and the cable core respectively.

[0007] Furthermore, the perforating gun is threadedly connected to the high-efficiency selective firing intermediate joint, and a sealing ring is provided between the outer wall of the high-efficiency selective firing intermediate joint and the inner wall of the perforating gun.

[0008] Furthermore, the insulating seat assembly is a boss-like structure, including a large end and a small end, the small end is threadedly connected to the rear seat of the bomb rack, and the large end is provided with three threaded holes, in which the first telescopic conductive head facing away from the rear seat of the bomb rack is respectively installed, and the tail end of the first telescopic conductive head is connected to the wire, which passes through the insulating seat assembly and the rear seat of the bomb rack and is electrically connected to the positive electrode of the detonator, the negative electrode of the detonator and the first contact pin assembly respectively.

[0009] Furthermore, the sealing baffle assembly includes a sealing baffle, in which 5 conductive contact pins are arranged, a sealing ring is arranged between the conductive contact pin and the inner wall of the sealing baffle, a large slip ring, a small slip ring and a center slip ring are arranged at one end of the sealing baffle, the large slip ring, the small slip ring and the center slip ring are respectively threadedly connected with the needle heads of the conductive contact pins, and the telescopic conductive head on the insulating seat assembly is in contact with the large slip ring, the small slip ring and the center slip ring respectively.

[0010] Furthermore, the emission selection module chip is electrically connected to the conductive contact pin connected to the large slip ring, the conductive contact pin connected to the small slip ring, the conductive contact pin connected to the center slip ring, the high-efficiency emission selection intermediate joint housing and the second contact pin assembly through wires.

[0011] Furthermore, the emission selection module chip is connected to the high-efficiency emission selection intermediate joint housing through a wire and a retaining pin.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) The existing technology is to place the selective firing module chip together with the detonator in the bomb rack. When the perforating bullet is detonated, the bomb rack components including the selective firing module chip will be damaged by the high-capacity shock wave. The present invention arranges the selective firing module chip inside the high-efficiency selective firing intermediate joint, so that the selective firing module chip can be repeatedly used with the high-efficiency selective firing intermediate joint, thereby saving a lot of costs. At the same time, the sealing baffle assembly arranged at one end of the joint body and the second contact pin assembly and the second gland at the other end not only realize the reliable electrical connection between adjacent perforating guns, but also play the role of heat resistance and pressure resistance and reliable sealing, which can effectively isolate the high pressure generated by the explosion of the perforating gun to avoid affecting the adjacent perforating guns, and at the same time realize the function of integrated directional and non-directional cluster perforating.

[0014] (2) The present invention further improves the sealing effect by providing a sealing ring between the perforating gun and the high-efficiency selective firing intermediate joint.

[0015] (3) The present invention sets the insulating seat assembly as a boss-shaped structure, fastened to the rear seat of the bomb frame, and has a threaded hole inside, so that the first telescopic conductive head can be installed, and the first telescopic conductive head contacts the slip ring on the sealing baffle assembly. The insulating seat assembly can be driven by the bomb frame bearing to rotate 360 ​​degrees, and the first telescopic conductive head is electrically connected to the slip ring on the sealing baffle assembly at any position, so as to achieve both rotation at any angle and reliable electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an assembly cross-sectional view of the perforating gun and the high-efficiency firing intermediate joint of the present invention.

[0017] Figure 2 It is a cross-sectional view of the insulating seat assembly of the present invention.

[0018] Figure 3 It is a cross-sectional view of the sealing baffle assembly of the present invention.

[0019] 1-perforating gun, 2-bearing seat, 31-front seat of bomb rack, 32-rear seat of bomb rack, 4-first contact pin assembly, 5-detonator, 6-bomb rack, 7-insulating seat assembly, 701-first telescopic conductive head, 8-sealing baffle assembly, 801-conductive contact pin, 802-large slip ring, 803-small slip ring, 804-center slip ring, 9-selection module chip, 10-high-efficiency selection intermediate joint, 11-second contact pin assembly, 12-second gland. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Reference Figure 1-3 A pumping graded perforating selector protection device comprises a perforating gun 1 and an efficient selector intermediate joint 10, wherein the efficient selector intermediate joint 10 is detachably connected to the perforating gun 1, and the efficient selector intermediate joint 10 comprises a joint body, wherein a selector module chip 9 is arranged at the center of the joint body, a second contact pin assembly 11 is arranged at one end of the joint body, the second contact pin assembly 11 is fixed in the joint body through a second gland 12, and a sealing baffle assembly 8 is installed at the other end, and shafts are arranged at both ends of the inner cavity of the perforating gun 1. The support seat 2 and the bearing seat 2 are respectively provided with a bomb rack front seat 31 and a bomb rack rear seat 32 through bearings, a bomb rack 6 is installed between the bomb rack front seat 31 and the bomb rack rear seat 32, a first contact pin assembly 4 is installed on the bomb rack front seat 31, an insulating seat assembly 7 is installed at one end of the bomb rack rear seat 32 away from the bomb rack front seat 31, a perforating bullet and a detonator 5 are installed in the bomb rack 6, a detonating cord is wound around the bomb rack 6, and the selective firing module chip 9 is respectively electrically connected to the next level protection device, the positive electrode of the detonator 5, the negative electrode of the detonator 5, the high-efficiency selective firing intermediate joint shell and the cable core.

[0022] In this embodiment, the perforating gun 1 is threadedly connected to the high-efficiency selective firing intermediate joint 10, and a sealing ring is provided between the outer wall of the high-efficiency selective firing intermediate joint 10 and the inner wall of the perforating gun 1, which can ensure the sealing of the connection between the perforating gun 1 and the high-efficiency selective firing intermediate joint 10.

[0023] In this embodiment, the insulating seat assembly 7 is a boss-shaped structure, including a large end and a small end, the small end is threadedly connected to the bomb rack rear seat 32, and the large end is provided with three threaded holes, in which the first telescopic conductive head 701 facing away from the bomb rack rear seat 32 is respectively installed, and the tail end of the first telescopic conductive head 701 is connected to the wire, and the wire passes through the insulating seat assembly 7 and the bomb rack rear seat 32 and is electrically connected to the detonator positive electrode, the detonator negative electrode and the first contact pin assembly 4 respectively. The sealing baffle assembly 8 includes a sealing baffle, Five conductive contact pins 801 are arranged in the sealing baffle, and a sealing ring is arranged between the conductive contact pins 801 and the inner wall of the sealing baffle. A large slip ring 802, a small slip ring 803 and a central slip ring 804 are arranged at one end of the sealing baffle. The large slip ring 802, the small slip ring 803 and the central slip ring 804 are respectively threadedly connected with the needle heads of the conductive contact pins 801, and the telescopic conductive head on the insulating seat assembly 7 is respectively in contact with the large slip ring 802, the small slip ring 803 and the central slip ring 804.

[0024] By setting the insulating seat assembly 7 as a boss-shaped structure, fastened to the rear seat 32 of the bomb frame, with a threaded hole inside, the first telescopic conductive head 701 can be installed, and the first telescopic conductive head 701 contacts the slip ring on the sealing baffle assembly 8. The insulating seat assembly 7 can be driven by the bearing of the bomb frame to rotate 360 ​​degrees, and the first telescopic conductive head 701 is electrically connected to the slip ring on the sealing baffle assembly 8 at any position, so that it can be rotated at any angle and has reliable electrical connection.

[0025] In this embodiment, the firing selection module chip 9 is electrically connected to the conductive contact pin connected to the large slip ring 802, the conductive contact pin connected to the small slip ring 803, the conductive contact pin connected to the center slip ring 804, the high-efficiency firing selection intermediate joint housing and the second contact pin assembly 11 through wires, thereby realizing the control of the perforating gun and the perforating bullet through the firing selection module chip 9.

[0026] In this embodiment, the hair selection module chip 9 is connected to the high-efficiency hair selection intermediate joint housing through a wire and a retaining pin.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A pumping graded perforating selector protection device, characterized in that: It comprises a perforating gun and a high-efficiency selective firing intermediate joint, wherein the high-efficiency selective firing intermediate joint is detachably connected to the perforating gun, the high-efficiency selective firing intermediate joint comprises a joint body, a selective firing module chip is arranged at the center of the joint body, a second contact pin assembly is arranged at one end of the joint body, the second contact pin assembly is fixed in the joint body through a second gland, a sealing baffle assembly is installed at the other end of the joint body, bearing seats are arranged at both ends of the inner cavity of the perforating gun, a bomb rack front seat and a bomb rack rear seat are respectively installed on the bearing seats through bearings, a bomb rack is installed between the front seat of the bomb rack and the rear seat of the bomb rack, a first contact pin assembly is installed on the front seat of the bomb rack, an insulating seat assembly is installed at one end of the rear seat of the bomb rack away from the front seat of the bomb rack, a perforating bomb and a detonator are installed in the bomb rack, a detonating cord is wound outside the bomb rack, and the selective firing module chip is electrically connected to the next level protection device, the positive pole of the detonator, the negative pole of the detonator, the shell of the high-efficiency selective firing intermediate joint and the cable core respectively; The insulating seat assembly is a boss-shaped structure, including a large end and a small end, the small end is threadedly connected to the rear seat of the bomb rack, and the large end is provided with three threaded holes, in which the first telescopic conductive heads facing away from the rear seat of the bomb rack are respectively installed, and the tail end of the first telescopic conductive head is connected to the wire, which passes through the insulating seat assembly and the rear seat of the bomb rack and is electrically connected to the positive electrode of the detonator, the negative electrode of the detonator and the first contact pin assembly respectively; The sealing baffle assembly comprises a sealing baffle, wherein 5 conductive contact pins are arranged in the sealing baffle, a sealing ring is arranged between the conductive contact pins and the inner wall of the sealing baffle, a large slip ring, a small slip ring and a central slip ring are arranged at one end of the sealing baffle, the large slip ring, the small slip ring and the central slip ring are respectively threadedly connected with the needle heads of the conductive contact pins, and the first telescopic conductive head on the insulating seat assembly is in contact with the large slip ring, the small slip ring and the central slip ring respectively; The perforating gun is threadedly connected to the high-efficiency selective firing intermediate joint, and a sealing ring is arranged between the outer wall of the high-efficiency selective firing intermediate joint and the inner wall of the perforating gun.

2. A pumping graded perforating selector protection device according to claim 1, characterized in that: The emission selection module chip is electrically connected to the conductive contact pin connected to the large slip ring, the conductive contact pin connected to the small slip ring, the conductive contact pin connected to the central slip ring, the high-efficiency emission selection intermediate joint housing and the second contact pin assembly through wires.

3. A pumping graded perforating selector protection device according to claim 2, characterized in that: The emission selection module chip is connected to the high-efficiency emission selection intermediate joint housing through a wire and a stop pin.

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