A modular selective firing controlled perforating gun

Abstract

The present invention discloses a modular perforating selective firing controlled perforating gun, which includes a detonator cartridge for installing a detonator and a wiring assembly; the ground wire of the detonator is fixed to the A terminal through a clamping structure, and the initiating wire is fixed to the B terminal through a clamping structure; at the same time, it supports direct leading-out of the detonator initiating wire and the ground wire; the wiring assembly includes an intermediate joint, a conductive contact slot, an insulating box, a through wire for power supply, and a selective firing switch for a selective firing control circuit, and the selective firing switch is assembled into the insulating box; there are at least two conductive contact slots, which respectively complete zero-wiring electrical conduction by clamping the A conductive copper ring and the B conductive copper ring; the present invention avoids wiring during on-site installation, greatly improves the installation efficiency, and reduces the error rate of wiring.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent control technology for bridge plugs and perforating in oil and gas exploitation, and particularly relates to a modular selection and firing control perforating gun. Background Art

[0002] During the process of oil and gas exploitation, usually after drilling, a casing is run in and cement is injected for well cementing. After well cementing, perforating and fracturing operations are carried out to open up the connection path between the oil and gas layer and the casing. The combined operation of bridge plugs and perforating is the most widely used perforating completion method for unconventional oil and gas reservoirs, which can effectively increase the production of a single well.

[0003] The perforating instrument string carries multiple perforating guns and is lowered into the casing well, staying at the position of one or more oil and gas layers in the underground rock formation. The perforating gun has shaped charge perforators inside. After the shaped charge perforators are detonated, they will successively penetrate the perforating gun barrel, the casing, and the cement casting layer, enabling hydrocarbons to flow into the casing. Once the perforating gun reaches the designated position, the surface instrument sends a firing signal, and the selection and firing switch can detonate the detonator in the perforating gun, and then ignite the detonating cord. The detonating cord detonates the shaped charge perforators to penetrate the gun barrel, the casing, and the cement layer, thereby allowing formation fluids to flow into the production tubing.

[0004] The assembly of the perforating gun requires assembling multiple parts, usually including at least the following components: gun barrel, cartridge rack, wired detonator, detonating cord, shaped charge perforator, selection and firing switch, intermediate joint, pressure-bearing wire passing device. At least two wires need to be manually connected between the wired detonator and the selection and firing switch. At least one wire needs to be connected between the selection and firing switch and the selection and firing switch in the next-stage perforating gun assembly. At least one wire needs to be connected between the selection and firing switch and the cartridge rack. At least one wire needs to be connected between the selection and firing switch and the pressure-bearing wire passing device. The gun barrels are connected to each other through intermediate joints, and relative rotational movement is required during connection. When one component is threaded into another component, the wires often get entangled, knotted, or even broken. In addition, when using a wired detonator, it must be manually connected to the electrical connection, which causes multiple problems. Due to the rotational assembly of the parts, the wiring may be worn, kinked, wrinkled, or cracked, and manual wiring is prone to rework. Summary of the Invention

[0005] To solve the above problems, the present invention provides a modular selection and firing control perforating gun, provides a zero-wiring device, and installs the zero-wiring device into the perforating gun, and all wiring operations are completed in the factory. Zero wiring on-site is achieved. Many faults introduced by wiring are avoided.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention designs a modular selective firing control perforating gun, which includes a perforating gun barrel. Inside the perforating gun barrel, a cartridge rack tube, a detonator clip cylinder, a wiring assembly, and an intermediate joint assembly for connecting each section of the perforating gun are sequentially arranged. The cartridge rack tube is of a cylindrical structure, and through holes for blasting are provided on the tube wall. Shaped charge perforating cartridges are arranged inside the cartridge rack tube. A detonator is arranged inside the detonator clip cylinder, and the detonator is connected with a fuse. The other end of the fuse is connected with the shaped charge perforating cartridge. The detonation signal is conducted to the wiring assembly through the intermediate joint assembly and detonates the detonator through the detonator clip cylinder. Finally, the detonator detonates the shaped charge perforating cartridge through the fuse. After the shaped charge perforating cartridge detonates, it penetrates the perforating gun barrel.

[0008] In the above modular selective firing control perforating gun, the intermediate joint assembly includes a pressure-bearing wire passing device, a hollow fixing screw, and a threaded joint. The hollow fixing screw is arranged at the top of the perforating gun, and the pressure-bearing wire passing device is fixed by threadedly connecting the hollow fixing screw with the threaded joint.

[0009] A cartridge rack connector for connecting the circuit is arranged at the tail end of the perforating gun. The cartridge rack connector includes a lower cartridge rack connector and an upper cartridge rack connector. It also includes an elastic metal contact disk for electrical connection. The lower cartridge rack connector is in electrical contact connection with the pressure-bearing wire passing device through the electrical contact of the metal contact disk, and the pressure-bearing wire passing device is in electrical contact connection with the upper cartridge rack connector through the electrical contact of the metal contact disk.

[0010] The present invention also relates to a on-site zero-wiring device for a modular selective firing control perforating gun. Based on the above selective firing control perforating gun, the detonator clip cylinder is of a tubular hollow cylinder structure. The detonator clip cylinder contains an A terminal, a B terminal, an A conductive copper ring, and a B conductive copper ring. The A terminal and the B terminal are of an elastic clamping structure, and the A conductive copper ring and the B conductive copper ring are arranged outside the detonator clip cylinder. The A terminal is connected with the A conductive copper ring through a wire, and the B terminal is connected with the B conductive copper ring through a wire. The ground wire of the detonator is fixed to the A terminal through the clamping structure, and the initiating wire is fixed to the B terminal through the clamping structure.

[0011] The wiring assembly includes an intermediate joint, a conductive contact slot, an insulating box, a through wire for power supply, and a selective firing switch for the selective firing control circuit.

[0012] Wires between the selective firing switch and the detonator, between the selective firing switch and the cartridge rack tube, and between the selective firing switch and the lower cartridge rack connector. The selective firing switch is assembled into the insulating box. There are at least two conductive contact slots, which respectively complete zero-wiring electrical conduction by clamping the A conductive copper ring and the B conductive copper ring.

[0013] The beneficial effects produced by adopting the present invention are as follows:

[0014] The selective firing switch circuit board is placed in the insulating box of the connection component. Wires between the selective firing switch and the detonator, between the selective firing switch and the cartridge tube, and between the selective firing switch and the lower cartridge connector are prefabricated, and electrical connection is achieved through the clamping structure, avoiding wiring during on-site installation, greatly improving the installation efficiency, and reducing the error rate of wiring. The detonator is connected with a wire clamp, and the conductive slip ring copper tube is clamped to the point. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic structural principle diagram of the modular selective firing control perforating gun described in the present invention.

[0016] Figure 2 FIG. is a schematic structural diagram of the on-site zero-wiring device of the modular selective firing control perforating gun described in the present utility model.

[0017] In the figure:

[0018] 1 - detonator clip cylinder; 101 - A terminal; 102 - B terminal; 103 - A conductive copper ring; 104 - B conductive copper ring; 2 - perforating gun barrel; 3 - wiring assembly; 301 - upper chuck; 302 - intermediate joint; 303 - conductive contact slot; 304 - insulating box; 305 - through wire; 306 - lower cartridge connector; 307 - upper cartridge connector; 308 - selective firing switch; 309 - cartridge tube; 310 - metal contact disk; 4 - intermediate joint assembly; 401 - pressure-bearing wire passing device; 402 - hollow fixing screw; 403 - threaded joint; 6 - cartridge; 7 - fixing groove; 8 - detonator; 9 - fuse; 10 - shaped charge perforator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Refer to Figure 1 and Figure 2 , the present invention provides a modular selective firing control perforating gun, including a perforating gun barrel 2, in which a cartridge tube 6, a detonator clip cylinder 1, a wiring assembly 3 and an intermediate joint assembly 4 are sequentially arranged; the cartridge tube 6 is of a cylindrical structure, and through holes for blasting are provided on the tube wall, and shaped charge perforators 10 are arranged inside the cartridge tube 6; a detonator 8 is arranged inside the detonator clip cylinder 1, and the detonator 8 is connected with a fuse 9; the other end of the fuse 9 is connected with the shaped charge perforator 10; the intermediate joint assembly 4 detonates the detonator 8 through the detonator clip cylinder 1, and finally the detonator 8 detonates the shaped charge perforator 10 through the fuse 9. After the shaped charge perforator 10 detonates, it will sequentially penetrate the perforating gun barrel 2, the casing and the cement casting layer, so that hydrocarbons can flow into the casing for convenient exploitation.

[0021] The detonator cartridge 1 loads existing ordinary detonators 8. The detonator cartridge 1 is of a tubular hollow cylinder structure. The detonator 8 is inserted into the interior of the detonator cartridge 1. The internal dimensions of the detonator cartridge 1 can be customized according to the dimensions of detonators from different detonator manufacturers. The detonator cartridge 1 includes an A terminal 101, a B terminal 102, an A conductive copper ring 103, and a B conductive copper ring 104. A wire is connected between the A terminal 101 and the A conductive copper ring 103, and a wire is connected between the B terminal 102 and the B conductive copper ring 104. The A terminal 101 and the B terminal 102 are of an elastic clamping structure and are arranged on both sides of the top end of the detonator cartridge 1. The A conductive copper ring 103 and the B conductive copper ring 104 are arranged around the outside of the detonator cartridge 1. The ground wire of the detonator 8 is fixed to the A terminal 101 through the clamping structure, and the initiating wire is fixed to the B terminal 102 through the clamping structure.

[0022] The wiring assembly 3 includes an upper chuck 301, an intermediate joint 302, a conductive contact card slot 303, an insulating box 304, a through wire 305 for power supply, a lower cartridge connector 306, an upper cartridge connector 307, a selection switch 308 for the selection and firing control circuit, and a cartridge tube 6. The upper chuck 301 and the lower chuck (not marked in the figure) are welded and fixed to both ends of the cartridge tube 6. The insulating box 304 is fixed to one end of the cartridge tube 6 connected with the intermediate joint 302 by screws. The insulating box 304 is used to load the selection switch 308 and the detonator 8, and prefabricates the wires between the selection switch 308 and the detonator 8, between the selection switch 308 and the cartridge tube 6, and between the selection switch 308 and the lower cartridge connector 306. The selection switch 308 is assembled into the insulating box 304. The conductive contact card slot 303 is used to clamp the detonator cartridge 1. Specifically, there are at least two conductive contact card slots 303, and zero-wiring electrical conduction is completed by clamping the A conductive copper ring 103 and the B conductive copper ring 104 respectively.

[0023] The upper cartridge connector 307 is installed on the upper chuck 301; it also includes a wire and a metal contact disk 310. One end of the wire is connected to the input end of the selection switch 308, and the other end is connected to the metal contact disk 310.

[0024] The lower cartridge connector 306 is installed on the intermediate joint 302 and includes a wire and a metal contact disk 310. One end of the wire is connected to the output end of the selection switch 308, and the other end is connected to the metal contact disk 310.

[0025] The selection switch 308 is used to receive the control signal from the ground control instrument, and output the detonator 8 initiation signal to the initiation end of the detonator 8 and output the cascade signal to the next-level selection switch 308. The ground wire of the selection switch 308 is fixed to the cartridge through screws.

[0026] The described pressure-bearing wire passing device 401 is installed inside the intermediate joint 302 and is used to conduct electricity between the lower cartridge connector 306 of the current perforating gun and the upper cartridge connector 307 of the next-stage perforating gun. The pressure-bearing wire passing device 401 includes an upper conductive thimble, a lower conductive thimble, an upper conductive spring, a lower conductive spring, a middle pressure-bearing conductive block, an upper pressure-bearing insulating shell, and a lower pressure-bearing insulating shell.

[0027] The described intermediate joint 302 is used to connect two stages of perforating guns.

[0028] The described intermediate joint assembly 4 includes a pressure-bearing wire passing device 401, a hollow fixing screw 402, and a threaded joint 403. A hollow fixing screw 402 is provided at the top of the perforating gun, and the hollow fixing screw 402 is threadedly connected to the threaded joint 403 to fix the pressure-bearing wire passing device 401.

[0029] At both ends of the perforating gun, a cartridge connector and a pressure-bearing wire passing device 401 for connecting the circuit are provided respectively. The cartridge connector includes a lower cartridge connector 306 and an upper cartridge connector 307; the lower cartridge connector 306 and the pressure-bearing wire passing device 401 are electrically connected through the electrical contact of a metal contact disk 310, and the pressure-bearing wire passing device 401 and the upper cartridge connector 307 are electrically connected through the electrical contact of a metal contact disk.

[0030] Without using a wired electrical connection, the present invention completes the assembly of the perforating gun assembly and the reliable transmission of signals.

[0031] The above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to this. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several equivalent substitutions or obvious variations are made, and if the performance or use is the same, they should all be regarded as belonging to the patent protection scope determined by the claims submitted by the present invention.

Claims

1. A modular selective firing controlled perforating gun, including an on-site zero wiring device, characterized in that: The on-site zero wiring device comprises a detonator barrel (1), the detonator barrel (1) is a tubular hollow barrel structure, the detonator barrel (1) comprises an A terminal (101), a B terminal (102), an A conductive copper ring (103) and a B conductive copper ring (104); the A terminal (101) and the B terminal (102) are elastic clamping structures, the A conductive copper ring (103) and the B conductive copper ring (104) are arranged outside the detonator barrel (1); the A terminal (101) and the A conductive copper ring (103) are connected by a wire, and the B terminal (102) and the B conductive copper ring (104) are connected by a wire; the ground wire of the detonator (8) is fixed to the A terminal (101) by the elastic clamping structure, and the detonating wire is fixed to the B terminal (102) by the elastic clamping structure; The wiring assembly (3) includes an intermediate joint (302), a conductive contact slot (303), an insulating box (304), a through wire (305) for power supply, and a selective switch (308) for selectively controlling the circuit. The insulating box (304) is used to load the selective switch (308) and the detonator (8), and prefabricated wires are provided between the selective switch (308) and the detonator (8), between the selective switch (308) and the bomb rack tube (6), and between the selective switch (308) and the lower bomb rack connector (306); the selective switch (308) is assembled into the insulating box (304); there are at least two conductive contact slots (303), which respectively clamp the A conductive copper ring (103) and the B conductive copper ring (104) to complete zero-connection electrical conduction; It also includes a perforating gun barrel (2), in which a bomb support tube (6), a wiring assembly (3) and an intermediate joint assembly (4) for connecting each section of the perforating gun are sequentially arranged; The intermediate joint assembly (4) comprises a pressure-bearing wire passer (401), a hollow fixing screw (402) and a threaded joint (403), wherein the hollow fixing screw (402) is arranged at the top of the perforating gun, and the hollow fixing screw (402) is threadedly connected to the threaded joint (403) to fix the pressure-bearing wire passer (401); The pressure-bearing wire passer (401) is installed in the middle joint (302) and is used to conduct the lower bomb rack connector (306) of the current-stage perforating gun and the upper bomb rack connector (307) of the next-stage perforating gun; the pressure-bearing wire passer (401) comprises an upper conductive ejector pin, a lower conductive ejector pin, an upper conductive spring, a lower conductive spring, a middle pressure-bearing conductive block, an upper pressure-bearing insulating shell, and a lower pressure-bearing insulating shell.

2. The modular selective firing controlled perforating gun according to claim 1, wherein The bomb rack tube (6) is a cylindrical structure, the wall of which is provided with a through hole for blasting, and a shaped-charge perforating bullet (10) is arranged inside the bomb rack tube (6); a detonator (8) is arranged inside the detonator clamp tube (1), and the detonator (8) is connected to a fuse (9); the other end of the fuse (9) is connected to the shaped-charge perforating bullet (10); a detonation signal is transmitted to the wiring assembly (3) through the intermediate joint assembly (4) and detonates the detonator (8) through the detonator clamp tube (1), and finally the detonator (8) detonates the shaped-charge perforating bullet (10) through the fuse (9), and the shaped-charge perforating bullet (10) penetrates the perforating gun barrel (2) after being detonated.

3. The modular selective firing controlled perforating gun according to claim 2, wherein A cartridge rack connector for connecting an electric circuit is provided at the tail end of the perforating gun. The cartridge rack connector includes a lower cartridge rack connector (306) and an upper cartridge rack connector (307); it also includes an elastic metal contact disc (310) for electrical connection. The lower cartridge rack connector (306) is electrically connected to the pressure-bearing wire passing device (401) through electrical contact connection by the metal contact disc (310), and the pressure-bearing wire passing device (401) is electrically connected to the upper cartridge rack connector (307) through electrical contact connection by the metal contact disc (310).

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