Post-effect perforator for perforation of oil and gas well

Abstract

The utility model discloses an aftereffect perforator for oil and gas well perforation, and relates to the technical field of petroleum perforation, the perforator comprises a perforating gun, a bullet rack, a plurality of perforating bullets, an aftereffect body and a detonating cord, the bullet rack is concentrically arranged in the perforating gun, the plurality of perforating bullets are symmetrically fixed in mounting holes of the bullet rack, and the detonating cord is arranged in the perforating gun. The adjacent perforating bullets are arranged in a 60-degree or 90-degree or 120-degree or 180-degree phase position mode, external threads or clamping grooves are formed in the outer ends of the perforating bullets, and the aftereffect bodies are detachably installed on the perforating bullets through the threads or the clamping grooves. Compared with the prior art, the structure of the aftereffect body is improved, formation of jet flow is facilitated, and a hole channel with a larger penetration depth advantage can be generated. Besides, the connecting mode of the aftereffect body and the perforating bullets is improved, an original integrated structure is replaced with a detachable structure, the perforating bullets and the aftereffect body can be transported and stored separately, and the perforating bullets with different performances can be flexibly matched according to different technical requirements or geological requirements.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum perforation technology, and in particular relates to an aftereffect perforator for oil and gas well perforation. Background Art

[0002] Perforating projectiles are commonly used in oilfield exploration and development. The quality of the perforator and the type of gun mounting directly affect the perforation depth and the production capacity of oil and gas wells.

[0003] In existing perforators, the perforating projectile and aftereffect body are integrated into a single structure, making it impossible to replace the perforating projectile with one of different performance characteristics based on technical or geological requirements. Furthermore, many existing perforators are equipped with a convex spherical shield, which, when breaking through the compacted perforation layer in oil and gas wells, affects jet formation and fails to create large channels.

[0004] Therefore, how to improve the energy of the perforation jet and efficiently break through the compacted perforation layer in oil and gas wells by changing and optimizing the layout and structure of the perforator has become a technical challenge in this field. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a post-effect perforator for oil and gas well perforation. This structure improves the post-effect body structure, which is beneficial to the formation of the jet and can produce a channel with greater penetration depth.

[0006] This utility model solves the above problems through the following technical means:

[0007] A post-effect perforator for oil and gas well perforation, characterized in that it comprises a perforating gun, a cartridge holder, perforating projectiles, a post-effect body, and a detonating cord, wherein: the cartridge holder is concentrically arranged inside the perforating gun, and the perforating gun and the cartridge holder are fixed together by a positioning ring or an end cap; multiple mounting holes are symmetrically opened on the tube of the cartridge holder, and multiple perforating projectiles are symmetrically fixed in the mounting holes, with adjacent perforating projectiles arranged at a phase of 60°, 90°, 120°, or 180°; the perforating projectile is filled with explosive, which is limited and fixed by a conical explosive liner; a detonation transmission hole is opened at the bottom of the perforating projectile, which is connected to an external detonating cord; the outer end of the perforating projectile is provided with an external thread or a groove; the post-effect body is detachably mounted on the external thread of the perforating projectile through the thread or groove.

[0008] Preferably, the aftereffect body comprises a blasting shell, an aftereffect explosive, and a positioning shroud, wherein: the blasting shell includes a connecting threaded pipe and a circular cap disposed at the end of the connecting threaded pipe, and a jet channel is provided in the middle of the circular cap; the aftereffect explosive is filled in an annular explosive chamber formed by the inner wall of the circular cap and the inner wall of the jet channel; the positioning shroud is fixed to the outside of the aftereffect explosive, and the positioning shroud is a concave parabolic shroud with a flange at the center hole of the positioning shroud.

[0009] Preferably, multiple baffles are symmetrically arranged inside the annular medicine compartment, and the baffles divide the annular medicine compartment into multiple spaced medicine compartments.

[0010] Preferably, the number of the spacer compartments is four, five, six, seven or eight, and the spacer compartments are filled with energy-enhancing drugs and perforating drugs at intervals.

[0011] Preferably, the aftereffect body has slots on its upper and lower sides for positioning with mounting holes.

[0012] The post-effect perforator for oil and gas well perforation of this utility model has the following beneficial effects:

[0013] 1) The connection method between the aftereffect body and the perforating projectile has been improved. A detachable structure has been used to replace the original integrated structure. The perforating projectile and the aftereffect body can be transported and stored separately. Perforating projectiles with different performance can be flexibly matched according to different technical requirements or geological needs.

[0014] 2) The convex spherical cover in the existing perforator has been removed, the structure of the aftereffect body has been improved, and a baffle has been set in the annular drug tank to facilitate the intermittent filling of drugs with different effects, which is conducive to the formation of the jet and can produce a channel with greater penetration advantage, and can efficiently break through the perforated compaction layer of oil and gas wells. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is an overall schematic diagram of the perforation projectile of this utility model;

[0018] Figure 3 This is a schematic diagram of the installation of the aftereffect body of this utility model;

[0019] Figure 4 This is a schematic diagram of the annular medicine container structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the card slot structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the working process of this utility model.

[0022] Among them, 1-perforating gun, 2-ammunition rack, 3-perforating ammunition, 301-explosive charge, 302-conical charge liner, 303-detonation hole, 304-external thread, 4-aftereffect body, 401-explosive shell, 402-aftereffect charge, 403-positioning charge liner, 404-connecting threaded pipe, 405-circular cap, 406-jet channel, 407-annular charge chamber, 408-baffle, 409-spacer charge chamber, 410-slot, 5-detonating cord. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] like Figures 1 to 6 As shown, the perforator includes a perforating gun 1, a cartridge holder 2, perforating projectiles 3, an aftereffect body 4, and a detonating cord 5. In the figure, the cartridge holder 2 is concentrically arranged inside the perforating gun 1. The perforating gun 1 and the cartridge holder 2 are fixed together by a positioning ring or an end cap. Multiple mounting holes are symmetrically opened on the tube of the cartridge holder 2. Multiple perforating projectiles 3 are symmetrically fixed in the mounting holes. Adjacent perforating projectiles 3 are arranged in a phase of 60°, 90°, 120°, or 180°. In the figure, a 180° phase arrangement scheme is adopted.

[0026] In this embodiment, the perforating projectile 3 is filled with explosive charge 301, which is fixed and limited by a conical charge liner 302. A detonation transmission hole 303 is provided at the bottom of the perforating projectile 3, and this hole is connected to an external detonating cord 5. It should be noted that the opening diameter of the detonating cord side of the perforating projectile 3 is enlarged, so that the assembly of the perforating projectile is no longer centered, but rather always positioned with the opening of the perforating projectile away from the blind hole. This design allows for more sufficient detonation height space for the perforating projectile, ensuring that the jet can enter the formation in the best possible condition to create deeper channels.

[0027] In the diagram, the outer end of the perforating projectile 3 is provided with an external thread 304 or a groove; the aftereffect body 4 is detachably mounted on the perforating projectile 3 via the thread or groove, or a tight insertion connection can be used. It should be noted that the connection method between the aftereffect body and the perforating projectile has been improved, using a detachable structure instead of the original integrated structure. The perforating projectile and the aftereffect body can be transported and stored separately, allowing for flexible matching of perforating projectiles with different performance characteristics according to different technical or geological requirements. Furthermore, the aftereffect body 4 has grooves 410 on its upper and lower sides for positioning with mounting holes, facilitating the assembly and disassembly of the aftereffect body.

[0028] In the figure, the aftereffect 4 is composed of a blasting shell 401, an aftereffect charge 402, and a positioning charge liner 403. The blasting shell 401 includes a connecting threaded pipe 404 and a circular cap 405 located at the end of the connecting threaded pipe 404. A jet channel 406 is provided in the middle of the circular cap 405. The aftereffect charge 402 is filled in the annular charge chamber 407 formed by the inner wall of the circular cap 405 and the inner wall of the jet channel 406. The positioning charge liner 403 is fixed to the outside of the aftereffect charge 402. The positioning charge liner 403 is a concave parabolic shield, and a flange is provided at the center hole of the positioning charge liner 403.

[0029] It should be noted that multiple baffles 408 are symmetrically arranged inside the annular drug container 407, and the baffles 408 divide the annular drug container 407 into multiple spaced drug containers 409. Specifically, the number of spaced drug containers 409 is four, five, six, seven or eight, and the spaced drug containers 409 are filled with energy-enhancing drugs and perforating drugs at intervals.

[0030] It should be further explained that the proposed solution removes the convex spherical cover from the existing perforator, improves the structure of the aftereffect body, and sets up a baffle in the annular drug tank to facilitate the intermittent filling of drugs with different effects, which is conducive to the formation of the jet and can produce a channel with greater penetration advantage, and can efficiently break through the compacted layer of the perforation in oil and gas wells.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A post-effect perforator for oil and gas well perforation, characterized in that, It includes a perforating gun (1), a magazine (2), a perforating cartridge (3), an aftereffect (4), and a detonating cord (5), wherein: The perforating gun (1) has a concentrically arranged cartridge holder (2) inside. The perforating gun (1) and the cartridge holder (2) are fixed together by a positioning ring or end cap. Multiple mounting holes are symmetrically opened on the tube of the cartridge holder (2). Multiple perforating bullets (3) are symmetrically fixed in the mounting holes. Adjacent perforating bullets (3) are arranged in a phase of 60°, 90°, 120° or 180°. The perforating projectile (3) is filled with explosive (301), which is limited and fixed by a conical explosive liner (302). The bottom of the perforating projectile (3) is provided with a detonation hole (303), which is connected to an external detonating cord (5). The outer end of the perforating projectile (3) is provided with an external thread (304) or a groove. The aftereffect body (4) is detachably mounted on the perforating projectile (3) by means of threads or slots; The aftereffect body (4) consists of a blasting shell (401), an aftereffect explosive (402), and a positioning explosive liner (403), wherein: The blasting casing (401) includes a connecting threaded pipe (404) and a circular cap (405) disposed at the end of the connecting threaded pipe (404), with a jet channel (406) opened in the middle of the circular cap (405). The aftereffect drug (402) is filled in the annular drug reservoir (407) formed by the inner wall of the circular cap (405) and the inner wall of the jet channel (406); The positioning cover (403) is fixed on the outside of the aftereffect drug (402). The positioning cover (403) is a concave parabolic cover, and a flange is provided at the center hole of the positioning cover (403). The annular medicine container (407) is symmetrically provided with multiple baffles (408), which divide the annular medicine container (407) into multiple spaced medicine containers (409).

2. The after-effect perforator for oil and gas well perforation as described in claim 1, characterized in that, The number of the spacer capsules (409) is four, five, six, seven or eight, and the spacer capsules (409) are filled with energy-enhancing drugs and perforating drugs.

3. The after-effect perforator for oil and gas well perforation as described in claim 2, characterized in that, The aftereffect body (4) has slots (410) on its upper and lower sides for positioning with mounting holes.

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