Downhole cutting torch ignition device

Abstract

The utility model discloses an ignition device of an underground cutting torch, which relates to the technical field of underground engineering and comprises an outer shell and an inner shell, one end of the outer shell is connected with a combustion chamber, the other end of the outer shell is connected with an interface of a power supply device, a cutting grain is arranged in the combustion chamber, the outer shell is provided with a nozzle, and the nozzle is communicated with an inner hole of the cutting grain. A plug is arranged in the power supply device interface; a lower plug is arranged at one end of the inner shell, an insulator is arranged at the other end of the inner shell, a containing space capable of being filled with ignition agents is formed in the inner shell, the two electrodes can penetrate through the insulator and stretch into the containing space, a heating element is arranged in the containing space, and the heating element is electrically connected with the electrodes. One end, far away from the accommodating space, of each electrode is electrically connected with a plug, and a foil is arranged on one side, close to the accommodating space, of the lower plug. The ignition device for the underground cutting torch is simple in structure and capable of responding quickly, and ensures that the cutting process is carried out efficiently.

Description

Technical Field

[0001] The utility model relates to the technical field of underground engineering, in particular to an underground cutting torch ignition device. Background Art

[0002] A pyrotechnic cutting torch is a device that ignites an energetic charge to form a high-temperature, high-pressure plasma jet, which is ejected from a specialized nozzle to cut downhole tubing. Due to its fast response, smooth cuts, and low cost, it is widely used in oilfield operations such as unblocking and well repair. The ignition device, a specialized component that initiates the cutting process, is often deployed in deep wells thousands of meters below the surface, facing complex operating environments such as mud, high temperatures, and high pressures. Its design and performance directly impact cutting efficiency, stability, and safety. First, the ignition device must react instantly and accurately to ignite the energetic charge. Delayed ignition directly impacts cutting performance and operational safety. Second, due to the confined and complex downhole environment, the ignition device's structural design must be simple and compact to ensure stable performance even within the confined space. Furthermore, the high temperatures, high pressures, and mud present require the ignition device to possess excellent sealing properties to prevent external interference and ensure proper operation under these extreme conditions. Therefore, it is essential to design a specialized ignition device that balances responsiveness, structural simplicity, and sealing performance. Utility Model Content

[0003] The purpose of the utility model is to provide an ignition device for an underground cutting torch to solve the problems existing in the above-mentioned prior art. The device has a simple structure and can respond quickly to ensure that the cutting process is carried out efficiently.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The utility model provides an ignition device for a downhole cutting torch, comprising an outer shell and an inner shell arranged inside the outer shell, one end of the outer shell is fixedly connected to a combustion chamber, and the other end of the outer shell is fixedly connected to an interface of a power supply device, a cutting charge is arranged in the combustion chamber, a nozzle is provided at one end of the outer shell close to the combustion chamber, the nozzle is communicated with the inner hole of the cutting charge, and a plug is provided inside the interface of the power supply device; a lower plug is fixedly provided at one end of the inner shell close to the nozzle, a nozzle is provided on the lower plug and communicated with the nozzle, an insulator is fixedly provided at the other end of the inner shell, an accommodating space that can be filled with ignition agent is formed inside the inner shell between the lower plug and the insulator, two electrodes can pass through the insulator and extend into the accommodating space, a heating element is provided in the accommodating space, the heating element is electrically connected to the electrodes, and the ends of the two electrodes away from the accommodating space are respectively electrically connected to one of the plugs, and a foil is provided on a side of the lower plug close to the accommodating space.

[0006] Preferably, sealing rings are provided between the housing and the power supply device interface and between the housing and the combustion chamber.

[0007] Preferably, a stepped hole capable of accommodating the electrode is provided on the insulator, and a retaining ring is provided between the electrode and the insulator.

[0008] Preferably, a limiting groove capable of placing the insulator is provided on the inner shell, and an upper plug is threadedly connected to one end of the inner shell away from the lower plug, and the upper plug can limit the insulator in the inner shell.

[0009] Preferably, a gasket is provided inside the outer shell between the inner shell and the power supply device interface.

[0010] Preferably, a straight groove is provided on the top of the upper stopper.

[0011] Preferably, a connection hole is provided on the electrode, and the heating element can pass through the connection hole and be fastened to the electrode.

[0012] Preferably, a blind hole into which the plug can be inserted is provided on the electrode.

[0013] Preferably, the plug is a banana plug.

[0014] Compared with the prior art, the utility model has achieved the following technical effects:

[0015] The utility model provides an ignition device for an underground cutting torch, in which the electrode is directly connected to the cable plug and forms a closed loop with the heating element, which is convenient for igniting the ignition agent and can simply and effectively realize the rapid response of the ignition device, so that the ignition agent breaks through the foil and is ejected from the nozzle of the lower plug and sprayed into the inner hole of the cutting charge column at the lower end, thereby initiating combustion of its internal combustion surface. Compared with the ignition device in the traditional ring cutting torch, the device structure is simpler, can respond quickly, and ensures that the cutting process is carried out efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the internal structure of the underground cutting torch ignition device provided by the utility model;

[0018] Figure 2A schematic diagram of the structure of the housing provided by the utility model;

[0019] Figure 3 A schematic structural diagram of the inner shell provided by the utility model;

[0020] Figure 4 A schematic diagram of the structure of the insulator provided by the utility model;

[0021] Figure 5 A schematic diagram of the structure of the electrode provided by the utility model;

[0022] Figure 6 A schematic structural diagram of the upper plug provided by the utility model;

[0023] Figure 7 This is a structural schematic diagram of the lower plug provided by the utility model.

[0024] In the figure: 1-outer shell; 2-electrode; 3-retaining ring; 4-inner shell; 5-upper plug; 6-insulator; 7-heating element; 8-ignition agent; 9-foil; 10-lower plug; 11-cutting charge; 12-combustion chamber; 13-gasket; 14-plug; 15-sealing ring; 16-power supply device interface. DETAILED DESCRIPTION

[0025] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0026] The purpose of the utility model is to provide an ignition device for an underground cutting torch to solve the problems existing in the prior art, with a simple structure and the ability to respond quickly, thereby ensuring that the cutting process is carried out efficiently.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] The utility model provides an ignition device for an underground cutting torch, such as Figures 1 to 7As shown, it includes an outer shell 1 and an inner shell 4 arranged inside the outer shell 1. The outer shell 1 is a cylindrical structure with an equal-diameter cavity inside. The cavity can accommodate the inner shell 4, the bottom end is narrowed, and the top end is tapped with an internal thread and a sealing surface. The inner shell 4 is an inner stepped circular tube structure. From the center to the two ends, the inner diameter of the tube increases and the wall thickness decreases to form an annular step, and is tapped with an internal thread at both ends. One end of the outer shell 1 is fixedly connected to the combustion chamber 12, and the other end of the outer shell 1 is fixedly connected to the power supply device interface 16. A cutting charge 11 is provided in the combustion chamber 12, and a nozzle is provided at one end of the outer shell 1 close to the combustion chamber 12, and the nozzle intersects with the inner hole of the cutting charge 11. The power supply device interface 16 has a plug 14 inside; a lower plug 10 is fixedly provided at one end of the inner shell 4 close to the nozzle, and a nozzle that is connected to the nozzle is opened on the lower plug 10. An insulator 6 is fixedly provided at the other end of the inner shell 4. An accommodating space that can be filled with an ignition agent 8 is formed between the lower plug 10 and the insulator 6 inside the inner shell 4. The two electrodes 2 can pass through the insulator 6 and extend into the accommodating space. A heating element 7 is provided in the accommodating space, and the heating element 7 is electrically connected to the electrode 2. The ends of the two electrodes 2 away from the accommodating space are respectively electrically connected to a plug 14, and a foil 9 is provided on the side of the lower plug 10 close to the accommodating space.

[0029] In some embodiments, a sealing ring 15 is provided between the housing 1 and the power supply device interface 16 and between the housing 1 and the combustion chamber 12 .

[0030] In some embodiments, the insulator 6 is a stepped cylindrical structure, the electrode 2 is a three-level stepped cylindrical structure, and two stepped holes for placing the electrodes 2 are symmetrically opened at the core position of the insulator 6. The insulator 6 is preferably made of ceramic material. Two identical electrodes 2 pass through the stepped holes of the insulator 6 from bottom to top. A groove is opened on the side wall of the electrode 2. The electrode 2 and the insulator 6 are fixed into an integrated structure by a retaining ring 3 placed in the groove on the side wall of the electrode 2, and the electrode 2 and the insulator 6 are transitionally matched.

[0031] In some embodiments, a limiting groove for placing the insulator 6 is provided on the inner shell 4, and an upper plug 5 is threadedly connected to the end of the inner shell 4 away from the lower plug 10. The tapped outer wall of the upper plug 5 can cooperate with the inner thread of the inner shell 4, and a through hole is provided in the core of the upper plug 5 for gap cooperation with the upper end of the insulator 6. The integrated structure formed by the electrode 2 and the insulator 6 can be placed on the upper end of the inner shell 4, and the end face of the insulator 6 can abut against the step inside the inner shell 4. The lower end of the insulator 6 is gap-matched with the inner shell 4. The integrated structure formed by the electrode 2 and the insulator 6 can be fixed to the upper end of the inner shell 4 by the upper plug 5.

[0032] The utility model provides an ignition device for a downhole cutting torch. After the upper end is assembled, it is turned over and an ignition agent 8 is injected from the lower end. In order to ensure the ignition efficiency, the ignition agent 8 needs to be compacted to a certain extent, and the density is preferably 10%-50%. After the material filling is completed, it is sealed by a lower plug 10 with a foil 9 covering the upper end. An axial spray hole is left on the lower plug 10, and the tapped thread on the outer end can be matched with the internal thread of the inner shell 4, and an external hexagonal nut is left at the upper end for fastening. The foil 9 is preferably circular, and the circular foil 9 can have a certain viscosity, such as aluminum foil tape, etc., and is pasted on the upper end face of the lower plug 10 to cover the spray hole to better ensure the sealing.

[0033] In some embodiments, a gasket 13 is provided inside the outer shell 1 between the inner shell 4 and the power supply device interface 16. The gasket 13 is a circular ring structure and is provided at the upper end of the inner shell 4. The outer wall of the power supply device interface 16 is provided with a groove for accommodating the sealing ring 15 and an external thread, which is connected to the outer shell 1 to achieve sealing, and by pressing the gasket 13, the overall structure of the inner shell 4 is fixed. The outer end of the outer shell 1 is also threaded and has an annular groove, and a sealed connection with the upper end of the combustion chamber 12 can be achieved through the sealing ring 15.

[0034] In some embodiments, a U-shaped groove is provided on the upper end surface of the upper plug 5 to facilitate locking and loosening.

[0035] In some embodiments, the electrode 2 is preferably made of BeQ2 brass, which has good conductivity and can ensure strength. A connecting hole perpendicular to the axis is provided on the small cylinder at the lower end of the electrode 2. The heating element 7 is preferably a nickel-chromium resistance wire or a miniature high-temperature ceramic heating rod, etc., and the heating temperature can reach 300-500°C. The two ends of the heating element 7 respectively pass through the connecting holes on the electrode 2 and are tightened to avoid loose connections.

[0036] In some embodiments, a deep blind hole is provided at the top of the electrode 2 into which the plug 14 can be inserted.

[0037] In some embodiments, the internal portion of the power supply device interface 16 leads out two positive and negative plugs 14 connected to the power supply cable. The plugs 14 are banana plugs that can be inserted into the blind holes of the two electrodes 2 respectively. The electrodes 2 are directly connected to the cables, which simply and effectively achieves a rapid response of the ignition device.

[0038] When the ignition device is working, the banana plugs of the power supply device are respectively connected to the two electrodes 2, forming a closed loop with the heating element 7, thereby igniting the ignition agent 8, breaking through the foil 9 and ejecting from the nozzle of the lower plug 10, and spraying into the inner hole of the lower end cutting column 11, triggering the combustion of its internal combustion surface. Among them, the power supply current of the power supply device is preferably 0.5-3A. The utility model adopts a dual-electrode structure arranged internally, and the structure is simpler. Compared with the ignition device in the traditional ring-cutting torch, the utility model is more suitable for oil pipes with slightly larger diameters.

[0039] The utility model has a quick response capability, which can ensure the efficient cutting process; the simple structure and lightweight design can improve its reliability and reduce costs; the high interchangeability can adapt to cutting torches of different models and functions; at the same time, the utility model also needs to have a moisture-proof effect to prevent the ignition agent 8 from becoming ineffective due to moisture.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An ignition device for a downhole cutting torch, characterized in that: include: a housing, one end of the housing being fixedly connected to the combustion chamber, the other end of the housing being fixedly connected to the interface of the power supply device, a cutting charge being provided in the combustion chamber, a nozzle being provided at one end of the housing close to the combustion chamber, the nozzle being in communication with the inner hole of the cutting charge, and a plug being provided inside the interface of the power supply device; and an inner shell arranged inside the outer shell, wherein a lower plug is fixedly provided at one end of the inner shell close to the nozzle, and a nozzle communicating with the nozzle is provided on the lower plug, and an insulator is fixedly provided at the other end of the inner shell, and a accommodating space capable of being filled with ignition agent is formed inside the inner shell between the lower plug and the insulator, and two electrodes can pass through the insulator and extend into the accommodating space, a heating element is provided in the accommodating space, and the heating element is electrically connected to the electrodes, and one end of the two electrodes away from the accommodating space is electrically connected to one of the plugs respectively, and a foil is provided on the side of the lower plug close to the accommodating space.

2. The downhole cutting torch ignition device according to claim 1, characterized in that: Sealing rings are provided between the shell and the power supply device interface and between the shell and the combustion chamber.

3. The downhole cutting torch ignition device according to claim 1, characterized in that: The insulator is provided with a stepped hole for placing the electrode, and a retaining ring is provided between the electrode and the insulator.

4. The downhole cutting torch ignition device according to claim 3, characterized in that: The inner shell is provided with a limiting groove for placing the insulator, and an upper plug is threadedly connected to one end of the inner shell away from the lower plug, and the upper plug can limit the insulator in the inner shell.

5. The downhole cutting torch ignition device according to claim 4, characterized in that: A gasket is provided inside the outer shell between the inner shell and the power supply device interface.

6. The downhole cutting torch ignition device according to claim 4, characterized in that: A straight groove is provided on the top of the upper plug.

7. The downhole cutting torch ignition device according to claim 1, characterized in that: The electrode is provided with a connection hole, and the heating element can pass through the connection hole and be fastened to the electrode.

8. The downhole cutting torch ignition device according to claim 1, characterized in that: The electrode is provided with a blind hole into which the plug can be inserted.

9. The downhole cutting torch ignition device according to claim 8, characterized in that: The plug is a banana plug.

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