Loosening device for loosening drilling tool

Abstract

The invention relates to the technical field of drilling equipment, in particular to a device for loosening a drilling tool when the drilling tool is stuck in drilling construction, and aims to relieve the technical problems of tedious front procedure, poor timeliness, poor controllability, high risk and poor environmental protection property of an initiating explosive device explosion loosening device in related technologies. The unbuckling device comprises a metal shell, an upper electrode, a lower electrode and a metal wire, the lower electrode is the positive electrode of the device, the upper electrode is the negative electrode of the device, and the bottom of the metal shell is grounded, so that the tripping device realizes a complete current path. The unbuckling device adopts a controllable shock wave technology of metal wire electric explosion to replace an initiating explosive device, can effectively control the generation of shock waves, does not need a preposed procedure, is quick in response, strong in controllability, high in efficiency, low in risk and high in environmental protection property, and has important significance for smooth on-site construction.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and in particular to a device for releasing the stuck drill string during drilling operations. Background Art

[0002] During the drilling process, after a stuck drill string occurs, explosive release of the stuck is an effective means to quickly solve the problem. Explosive release of the stuck refers to using the shock wave generated by the explosion of pyrotechnics to act on the drill string connection to achieve release of the stuck.

[0003] Traditional explosive release of the stuck has some problems: for example, the use of pyrotechnics requires relevant procedures to be handled by the local public security bureau and cannot be operated across regions; the process of obtaining pyrotechnics is cumbersome and time-consuming; usually, the construction area is extensive, and the pyrotechnics used for explosive release services cannot reach the well in a timely manner; the shock wave generated by pyrotechnics has poor controllability, high danger, and poor environmental protection.

[0004] In summary, the traditional pyrotechnic explosive release device has problems such as cumbersome pre-procedures, poor timeliness, poor controllability, high danger, and poor environmental protection. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for releasing the stuck drill string during drilling operations to alleviate the technical problems of the pyrotechnic explosive release device in the related art, such as cumbersome pre-procedures, poor timeliness, poor controllability, high danger, and poor environmental protection.

[0006] To solve the above technical problems, the technical solution provided by the present invention is as follows:

[0007] The release device provided by the present invention includes a metal housing, an upper electrode, a lower electrode, and a metal wire;

[0008] The metal housing is in the shape of a hollow cylinder, and a plurality of shock wave release windows are provided on the outer wall. The metal housing is connected to the ground wire;

[0009] The upper electrode is arranged in the upper section of the metal housing, and the lower electrode is coaxially arranged in the lower section of the metal housing. The lower electrode is connected to a cable;

[0010] A metal wire is inserted between the upper electrode and the lower electrode;

[0011] The lower electrode is the positive electrode of the device, the metal wire serves as the load, the upper electrode is the negative electrode of the device, and the bottom of the metal housing is grounded to enable the release device to achieve a complete current path.

[0012] Furthermore, the upper part of the metal housing is connected to the upper electrode through a plurality of metal screws, and the upper electrode is electrically connected to the metal housing. A grounding screw is provided at the lower end of the metal housing, and the grounding screw is used to connect to the ground wire.

[0013] Further, the upper electrode includes a copper sleeve and a first electrode sheet, and the first electrode sheet is connected to the lower end of the copper sleeve.

[0014] Further, the lower electrode includes a second electrode sheet, an upper base of the second electrode, and a lower base of the second electrode;

[0015] The second electrode sheet is threadedly connected to the upper end of the upper base of the second electrode, and the lower base of the second electrode is connected to the lower end of the upper base of the second electrode.

[0016] Further, a through groove and a threaded hole perpendicular to and penetrating the through groove are provided at the lower end of the lower base of the second electrode. The cable core passes through the through groove and is fixed by an electrode screw. This electrode structure can reduce the electric field distortion coefficient around it and reduce the breakdown probability.

[0017] Further, a plurality of metal wire holes are provided on both the first electrode sheet and the second electrode sheet, and the metal wire holes are used for threading metal wires.

[0018] Preferably, the distribution shapes of the metal wire holes are divided into arc shapes and parallel shapes, and the influence of the converging shock wave generated by the arc-shaped metal wires and the parallel shock wave generated by the parallel-shaped metal wires on the drill can be studied respectively.

[0019] Further, the releasing device further includes an insulating cylinder. The insulating cylinder wraps the lower electrode and is fixed inside the metal shell by a plurality of insulating screws to prevent current from directly flowing into the metal shell.

[0020] Further, the releasing device further includes a connecting rod; the connecting rod passes through the through hole provided in the copper sleeve and is sequentially threadedly connected to the first electrode sheet and the second electrode sheet to limit the distance between the first electrode sheet and the second electrode sheet. The device can replace the metal wire without moving the positive electrode part through the connecting rod.

[0021] Further, a plurality of pull rods 600 are provided. By rotating the pull rods 600, the separation of the second electrode sheet 220 from the upper base 320 of the second electrode can be achieved.

[0022] Based on the above technical solutions, the beneficial effects of the present invention are analyzed as follows:

[0023] A device for releasing a stuck drill during drilling construction includes a metal shell, an upper electrode, a lower electrode, metal wires, and an insulating cylinder;

[0024] The metal shell is in the shape of a hollow cylinder, and a plurality of shock wave release windows are provided on the outer wall. The metal shell is connected to the ground wire;

[0025] The upper electrode is arranged in the upper section of the metal shell, the lower electrode is coaxially arranged in the lower section of the metal shell, and the lower electrode is connected to the cable core;

[0026] The metal wire penetrates between the upper electrode and the lower electrode.

[0027] In specific applications, the lower electrode is the positive electrode of the device, the metal wire serves as a load, the upper electrode is the negative electrode of the device, the bottom of the metal housing is grounded, the current passes through the cable, enters the lower electrode, and then sequentially passes through the metal wire, the upper electrode and the metal housing, and finally flows out through the ground wire; a pulsed high current is applied to cause the metal wire to undergo electro-explosion, and the generated shock wave acts on the inner wall of the drill tool through the shock wave release window of the metal housing, realizing the release of the drill tool.

[0028] It can be seen that compared with the prior art, this loosening device uses the controllable shock wave technology of metal wire electro-explosion to replace the pyrotechnics, which can effectively control the generation of shock waves, does not require pre-procedures, has a fast response, strong controllability, high efficiency, low danger, and high environmental protection, solving the problems of cumbersome pre-procedures, poor timeliness, poor controllability, high danger, and poor environmental protection existing in the traditional pyrotechnic explosion loosening device, and is of great significance for the smooth progress of on-site construction. Brief Description of the Drawings

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic diagram of the overall structure of the loosening device provided by the embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the connecting rod according to the embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the upper electrode plate according to the embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the lower base of the second electrode according to the embodiment of the present invention.

[0034] Icon:

[0035] 100, metal housing; 110, metal screw; 120, grounding screw;

[0036] 200, upper electrode; 210, copper sleeve; 220, first electrode plate;

[0037] 300, lower electrode; 310, second electrode plate; 320, upper base of the second electrode; 330, lower base of the second electrode; 331, electrode screw;

[0038] 400, wire; 410, wire hole;

[0039] 500, insulating cylinder; 510, insulating screw;

[0040] 600, pull rod. Specific implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0044] Traditional explosive release devices for stuck drill pipes have problems such as cumbersome pre-procedures, poor timeliness, poor controllability, high danger, and poor environmental protection.

[0045] In view of this, the present invention provides a device for releasing a stuck drill pipe during drilling operations, including:

[0046] A metal housing 100, an upper electrode 200, a lower electrode 300, and a wire 400;

[0047] The metal housing 100 is in the shape of a hollow cylinder, and a plurality of shock wave release windows are provided on the outer wall. The metal housing 100 is connected to the ground wire;

[0048] The upper electrode 200 is arranged at the upper section of the metal housing 100, and the lower electrode 300 is coaxially arranged at the lower section of the metal housing 100. The lower electrode 300 is connected to a cable;

[0049] A wire 400 is inserted between the upper electrode 200 and the lower electrode 300.

[0050] Based on the above technical solutions, the release device provided by the present invention can achieve the following technical effects:

[0051] This loosening device uses the technology of controllable shock waves generated by the electro-explosion of metal wires to replace pyrotechnics, which can effectively control the generation of shock waves. It has no pre-procedures, fast response, strong controllability, high efficiency, low danger, and high environmental friendliness. It solves the problems of traditional pyrotechnic explosion loosening devices, such as cumbersome pre-procedures, poor timeliness, poor controllability, high danger, and poor environmental friendliness, and is of great significance for the smooth progress of on-site construction.

[0052] The following will combine Figures 1 to 3 to elaborate in detail on the structure and shape of the loosening device provided in this embodiment:

[0053] Furthermore, the upper part of the metal shell 100 is connected to the upper electrode 200 through a plurality of metal screws 110, and the upper electrode 200 is electrically connected to the metal shell 100. A grounding screw 120 is provided at the lower end of the metal shell 100, and the grounding screw 120 is used to connect the ground wire.

[0054] Regarding the structural composition of the upper electrode 200, specifically:

[0055] The upper electrode 200 includes a copper sleeve 210 and a first electrode plate 220, and the first electrode plate 220 is connected to the lower end of the copper sleeve 210.

[0056] Regarding the structural composition of the lower electrode 300, specifically:

[0057] The lower electrode 300 includes a second electrode plate 310, a second upper electrode base 320, and a second lower electrode base 330;

[0058] The second electrode plate 310 is threadedly connected to the upper end of the second upper electrode base 320, and the second lower electrode base 330 is connected to the lower end of the second upper electrode base 320.

[0059] Regarding how the second lower electrode base 330 is fixedly connected to the cable core, specifically:

[0060] A through groove and a threaded hole perpendicular to and penetrating the through groove are provided at the lower end of the second lower electrode base 330. The cable core passes through the through groove and is fixed by an electrode screw 331. This symmetric and smooth structure can reduce the electric field distortion coefficient around, reduce the breakdown probability, and enable more electromagnetic energy to be converted into shock wave energy.

[0061] Regarding how the metal wire 400 is fixed on the first electrode plate 220 and the second electrode plate 310, specifically:

[0062] A plurality of metal wire holes 410 are provided on both the first electrode plate 220 and the second electrode plate 310, and the metal wire holes 410 are used to penetrate the metal wire 400;

[0063] Preferably, the distribution shapes of the wire holes 410 are divided into an arc shape and a parallel shape. The converging shock waves generated by the arc-shaped wires 400 and the parallel shock waves generated by the parallel-shaped wires 400 can be studied separately to analyze their effects on the drill tool. The design of the electrode plates can change the load configuration of the wire array 400. According to the actual situation, the load configuration of the inserted wires 400 can be selected to make the shock waves converged by the electro-explosion of the wires 400 effectively act on the inner wall of the drill tool, realizing the unthreading of the drill tool.

[0064] Specifically regarding why the lower electrode 300 does not short-circuit with the metal housing 100:

[0065] The tripping device further includes an insulating cylinder 500. The insulating cylinder 500 wraps the lower electrode 300 and is connected to the metal housing 100 through a plurality of insulating screws 510 to prevent current from directly flowing into the metal housing 100, causing a short circuit in the circuit, so that the wires 400 cannot generate electro-explosion shock waves, resulting in the failure of the tripping device.

[0066] Furthermore, the tripping device further includes a connecting rod 600. The connecting rod 600 passes through the through hole provided in the copper sleeve 210 and is sequentially threadedly connected to the first electrode plate 220 and the second electrode plate 310 to define the distance between the first electrode plate 220 and the second electrode plate 310. The tripping device can replace the wires 400 with preset parameters without moving the positive electrode part through the connecting rod 600.

[0067] Furthermore, a plurality of pull rods 600 are provided. By rotating the pull rods 600, the separation of the second electrode plate 220 from the upper base 320 of the second electrode can be achieved, facilitating the installation and replacement of the wires.

[0068] In summary, the specific working process of the unthreading device provided in this embodiment is as follows:

[0069] During construction operations, connect the cable core to the lower base 330 of the second electrode, fix the ground wire to the ground screw 120, tighten the two connecting rods 600, tighten the first electrode plate 220 and the second electrode plate 310, unscrew the metal screw 110 on the metal housing 100, rotate the two connecting rods 600 together with the copper sleeve 210, and screw out the first electrode plate 220 and the second electrode plate 310 together from the metal housing 100. Insert a metal wire 400 with preset parameters between the first electrode plate 220 and the second electrode plate 310, with both ends of the metal wire 400 closely attached to the first electrode plate 220 and the second electrode plate 310. Then, screw the part of the device with the metal wire 400 into the metal housing 100 by rotating the two connecting rods 600, fix the metal screw 110, and after installation, unscrew the two connecting rods 600 respectively. Only the metal wire 400 is connected between the positive and negative electrodes. The current passes from the cable through the lower base 330 of the second electrode, the upper base 320 of the second electrode, and the second electrode plate 310 to act on the metal wire 400, and then flows into the ground wire through the first electrode plate 220, the copper sleeve 210, the metal housing 100, and the ground screw 120, forming a complete current path. Insert the release device into the drill tool, apply a pulsed high current to the load of the metal wire 400, and the electro-explosion of the metal wire 400 generates a strong shock wave that acts on the inner wall of the drill tool through the shock wave release window of the metal housing 100, causing the drill tool to be successfully unfastened.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for releasing the stuck drill pipe during drilling construction, characterized in that: It includes a metal housing (100), an upper electrode (200), a lower electrode (300) and a metal wire (400); The metal housing (100) is in the shape of a hollow cylinder, and there are multiple shock wave release windows on its outer wall. The metal housing (100) is connected to the ground wire; The upper electrode (200) is arranged in the upper section of the metal housing (100), the lower electrode (300) is coaxially arranged in the lower section of the metal housing (100), and the lower electrode (300) is connected to a cable; The metal wire (400) is inserted between the upper electrode (200) and the lower electrode (300).

2. The release device according to claim 1, characterized in that: The upper part of the metal housing (100) is connected to the upper electrode (200) through multiple metal screws (110). There is a grounding screw (120) at the lower end of the metal housing (100), and the grounding screw is used to connect to the ground wire.

3. The release device according to claim 2, characterized in that: The upper electrode (200) includes a copper sleeve (210) and a first electrode plate (220). The first electrode plate (220) is connected to the lower end of the copper sleeve (210), and the first electrode plate (220) is connected to the metal wire (400).

4. The release device according to claim 3, characterized in that: The lower electrode (300) includes a second electrode plate (310), an upper base of the second electrode (320) and a lower base of the second electrode (330); The second electrode plate (220) is connected to the metal wire (400). The second electrode plate (310) is threadedly connected to the upper end of the upper base of the second electrode (320), and the lower base of the second electrode (330) is connected to the lower end of the upper base of the second electrode (320).

5. The release device according to claim 4, characterized in that: There is a through groove and a threaded hole perpendicular to and penetrating the through groove at the lower end of the lower base of the second electrode (330). The core of the cable passes through the through groove and is fixed by an electrode screw (331).

6. The release device according to claim 5, characterized in that: There are multiple metal wire holes (410) on both the first electrode plate (220) and the second electrode plate (310), and the metal wire holes (410) are used to insert the metal wire (400).

7. The release device according to claim 6, characterized in that: It further includes an insulating cylinder (500); the insulating cylinder (500) wraps the lower electrode (300) and is fixed inside the metal housing (100) through multiple insulating screws (510).

8. The release device according to claim 7, characterized in that: Further included is a connecting rod (600); the connecting rod (600) passes through a through hole provided in the copper sleeve (210) and is sequentially threadedly connected to the first electrode plate (220) and the second electrode plate (310) to define the distance between the first electrode plate (220) and the second electrode plate (310).

9. The loosening device according to claim 8, wherein: A plurality of the connecting rods (600) are provided.

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