Oil and gas well dynamic energy-gathering gas fracturing plugging device
By designing a dynamic energy-concentrating gas fracturing and plugging device, which uses an ignition tube and an open-hole gun barrel to confine the gas, and combines enhanced and delayed propellant columns, the problems of downhole debris falling into the well and low energy utilization efficiency caused by the separation of existing devices are solved, and stable fracturing and plugging effects are achieved in the wellbore.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2026-03-24
AI Technical Summary
Existing high-energy gas fracturing devices are prone to splitting into upper and lower parts during use, leading to accidents such as falling objects and cable jamming. In addition, they have low energy utilization efficiency and insufficient fracturing and unblocking effects.
A dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells was designed, including an ignition tube, a propellant column, an open-hole gun barrel, a heat insulation body, and a damping structure. The propellant column is ignited by a cable, and the gas generated by the combustion of the propellant column is constrained by the open-hole gun barrel to ensure the stability of the device in the wellbore and improve energy efficiency. Furthermore, the gas pressure and action time are improved by combining enhanced propellant column and delayed propellant column.
It effectively avoids cable crushing and damage, eliminates the risk of wellbore stuck, improves the energy efficiency of propellant, promotes the formation of new fractures and the extension of original fractures, and enhances the pressure cracking and plugging effect.
Smart Images
Figure CN224032592U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of downhole operation tools for oil and gas extraction, specifically to a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells. Background Technology
[0002] High-energy gas fracturing technology utilizes solid rocket propellant (hereinafter referred to as gunpowder) to generate high-pressure gas through combustion or deflagration in the perforated section of oil and gas wells. This gas is used to fracture and unblock the formation in the near-wellbore area, thereby expanding the original fractures and generating new fractures, and clearing oil and gas channels, thereby increasing oil and gas production or water injection efficiency.
[0003] Existing high-energy gas fracturing devices consist of a propellant charge, a fusible carrier, and an ignition device. Their structural features include a shell-less design and a fusible carrier. Due to their simple structure, no recovery procedures are required after use, leading to their widespread application in oilfield development. However, during use, it has been found that after ignition in the wellbore, the propellant separates into upper and lower parts. Since the upper part is unconstrained in the wellbore, it rapidly expands and continues to burn along the entire wellbore's radial direction, causing cable accumulation and increasing the risk of downhole debris and cable jamming accidents. After such accidents, significant time and effort are required to clear the faults. The lower part falls freely into the well fluid and continues to burn. During the combustion phase, most of the propellant's energy is transferred to the wellbore fluid, converting it into potential energy. This energy is repeatedly released through up-and-down oscillations within the wellbore, resulting in ineffective energy release, insufficient fracturing and unblocking effects, and low energy utilization efficiency. Utility Model Content
[0004] To address the problems of existing high-energy gas fracturing devices that are separated into upper and lower parts during use, which easily leads to accidents such as downhole debris falling and cable jamming, and the fact that most of the energy is ineffectively released in the wellbore, resulting in insufficient fracturing and unblocking effects, this utility model provides a dynamic energy-concentrating gas fracturing and unblocking device for oil and gas wells.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] This utility model proposes a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells, characterized in that it includes an ignition tube, on which a gunpowder column is threaded; and an open-hole gun barrel is threaded through the outside of the gunpowder column.
[0007] One end of the perforated gun barrel is connected to the breech, and a damping structure is connected to the breech. The other end of the perforated gun barrel is connected to the gun head, and a heat shield is connected to the gun head. A lifting ring is connected to the heat shield.
[0008] An ignition wire is connected to the ignition tube. The ignition wire passes through the gun head and the heat insulation body, and extends to the outside of the heat insulation body to connect with a cable.
[0009] Preferably, the propellant column includes a reinforcing propellant column, a main propellant column, and a delay propellant column. The main propellant column is inserted at the center of the ignition tube, the reinforcing propellant column is inserted on the side of the ignition tube near the gun head, and the delay propellant column is inserted on the side of the ignition tube near the gun breech.
[0010] Preferably, a fixed connector is connected to one end of the ignition tube opposite to the heat insulation body, and the end of the fixed connector away from the ignition tube is connected to the gun head by a thread.
[0011] Preferably, the length of the perforated barrel is in the range of 1000mm to 3600mm, the outer diameter of the perforated barrel is in the range of 89mm to 102mm, and the wall thickness of the perforated barrel is in the range of 8mm to 13mm.
[0012] Preferably, the hole in the perforated barrel is one or more of a round hole, an elliptical hole, and a flat hole.
[0013] Preferably, the aperture diameter on the perforated gun barrel is in the range of 30mm to 35mm.
[0014] Preferably, the heat insulation body includes a heat insulation buffer tube, one end of which is connected to the gun head, and the other end of which is connected to the lifting ring;
[0015] The outer wall of the heat insulation buffer tube is provided with heat dissipation holes.
[0016] Preferably, the length of the heat insulation buffer tube is in the range of 500mm to 1000mm.
[0017] Preferably, the lifting ring includes a connecting section, in which the ignition wire is threaded, and the end of the ignition wire extends out of the connecting section and is connected to a cable;
[0018] One end of the connecting section is connected to the end of the heat insulation buffer tube away from the gun head, and the other end of the connecting section is connected to the hoisting section.
[0019] Preferably, the damping structure includes a drag bar, one end of which is connected to the breech and the other end of which is connected to a drag hammer.
[0020] Compared with the prior art, the present invention has the following beneficial technical effects:
[0021] This invention proposes a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells. The device ignites an ignition tube via a cable, which in turn ignites a propellant column. During combustion, all the gas is constrained by the perforated nozzle, preventing it from generating an upward thrust on the entire device. This keeps the device stable within the wellbore. Simultaneously, the gas generated by the combustion of the propellant is constrained by the perforated nozzle, forcing it to exit through holes in the nozzle and flow towards the formation, thus improving the energy efficiency of the propellant. Furthermore, the gas does not impact the wellbore fluid on the cross-section of the carrier, preventing damage to the cable and eliminating the risk of stuck pipe.
[0022] Furthermore, this device incorporates an enhanced propellant column, a main propellant column, and a delayed propellant column. The main propellant column rapidly generates high-pressure gas upon combustion, and the gas from the main propellant column ignites the enhanced propellant column upwards. The gas generated after the enhanced propellant column burns further accelerates the formation of gas pressure, increasing the rate of gas pressure rise. This is beneficial for the formation of new cracks and the extension of existing cracks, thereby improving the pressure cracking and plugging effect. The gas from the main propellant column ignites the delayed propellant column downwards, and the delayed propellant column utilizes end-face combustion to extend the duration of gas pressure action.
[0023] Furthermore, by setting a fixed connector, the perforated gun barrel is connected to the ignition tube and the gunpowder, so that the outer shell of the device is grounded, preventing the gunpowder column inside the device from moving around when it is lowered into the well.
[0024] Furthermore, the length of the perforated gun tube in this device ranges from 1000mm to 3600mm, which can adapt to the operational needs of different well sections. The outer diameter of the perforated gun tube ranges from 89mm to 102mm, which is compatible with various wellbore specifications, thus improving the versatility of this device. The perforation on the perforated gun tube provides a flow channel for the gas produced after the combustion of the propellant, generating a dynamic energy-concentrating pressure waveform, which in turn promotes the formation of new fractures and the extension of original fractures in the formation, thereby achieving the effect of pressure cracking and plugging.
[0025] Furthermore, by incorporating a heat insulation element, this device reduces the risk of the high-temperature gas generated after the propellant charge burns, which could cause the cable connected to the ignition line to burn or fall.
[0026] Furthermore, this device incorporates a damping structure, which consists of a breechblock, a drag bar, and a drag hammer. The drag hammer acts as a centering element during well running and provides resistance to the device, mitigating the disturbance of the combustion gases from the propellant charge. The drag bar isolates the breechblock and the drag hammer, preventing the combustion gases from descending to the bottom of the drag hammer and creating an upward thrust on the device. This ensures that the combustion gas pressure acts stably at the corresponding position within the wellbore, guaranteeing the safety and reliability of the pressure cracking plug. Attached Figure Description
[0027] Figure 1This is a schematic diagram of the overall structure of a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0028] Figure 2 This is one of the partial cut-off schematic diagrams of a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0029] Figure 3 This is the second partial cut-off schematic diagram of a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0030] Figure 4 This is a schematic cross-sectional view of the lifting ring in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model.
[0031] Figure 5 This is a schematic diagram of the structure of the heat insulation buffer pipe in the dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0032] Figure 6 This is a partial cross-sectional structural diagram of the nozzle in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model.
[0033] Figure 7 This is a schematic diagram of the fixed joint in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0034] Figure 8 This is a schematic cross-sectional view of the enhanced propellant column in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model.
[0035] Figure 9 This is a schematic cross-sectional view of the main propellant column in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model.
[0036] Figure 10 This is a schematic cross-sectional view of the delayed-action propellant column in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model.
[0037] Figure 11 This is a schematic diagram of the structure of an embodiment of the perforated gun barrel in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0038] Figure 12 This is a schematic diagram of another embodiment of the perforated gun barrel in the dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0039] Figure 13 This is a schematic diagram of the breech in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0040] Figure 14 This is a schematic diagram of the drag bar structure in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0041] Figure 15 This is a schematic diagram of the resistance hammer in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0042] Figure 16 This is a schematic diagram of the ignition tube in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0043] Figure 17 This is a partially enlarged view of the ignition tube in a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells proposed in this utility model;
[0044] In the attached diagram: 1. Lifting ring; 2. Insulated buffer tube; 3. Gun head; 4. Fixed joint; 5. Ignition tube; 6. Opening barrel; 7. Reinforcing propellant charge; 8. Main propellant charge; 9. Delayed propellant charge; 10. Tailstock; 11. Pulling rod; 12. Drag hammer. Detailed Implementation
[0045] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.
[0046] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.
[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0049] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0050] This utility model proposes a dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells, such as... Figures 1-17 As shown, the gun includes an ignition tube 5, on which multiple gunpowder columns are equally spaced; a perforated barrel 6 is connected to the outside of the multiple gunpowder columns; one end of the perforated barrel 6 is connected to a breech 10, on which a damping structure is connected; the other end of the perforated barrel 6 is connected to a gun head 3, on which a heat shield is connected; a lifting ring 1 is connected to the heat shield; an ignition wire is connected to the ignition tube 5, which passes through the gun head 3 and the heat shield, and passes through the lifting ring 1 to connect to an electric cable. This device uses a cable to ignite the propellant column via the ignition tube 5. The propellant column ignites other propellant columns upwards, increasing the rate of gas pressure rise and promoting the formation of new fractures, thus improving the pressure cracking and plugging effect. It also ignites other propellant columns downwards, creating end-face combustion and prolonging the duration of gas pressure action. During combustion, all gas is constrained by the perforated nozzle 6, preventing upward thrust on the entire device and maintaining its position within the wellbore. The gas produced by the burning propellant is also constrained by the perforated nozzle 6, forcing it to flow into the formation through the perforated nozzle 6, improving the energy efficiency of the propellant. Throughout operation, the device remains intact, preventing the gas from impacting the wellbore fluid on the carrier's cross-section, thus virtually eliminating the risk of cable damage and wellbore sticking.
[0051] like Figures 8-9As shown, the propellant charge includes a reinforcing propellant charge 7, a main propellant charge 8, and a delay propellant charge 9. The main propellant charge 8 is positioned at the center of the ignition tube 5. The reinforcing propellant charge 7 is positioned on the ignition tube 5 near the gun head 7, meaning it is located between the main propellant charge 8 and the gun head 7. The delay propellant charge 9 is positioned on the ignition tube 5 near the breech 10, meaning it is also located between the main propellant charge 8 and the breech 10. The reinforcing propellant charge 7, the main propellant charge 8, and the delay propellant charge 9 are all 500mm long and have an outer diameter of 80mm. The diameter of the central hole in the reinforcing propellant charge 7 ranges from 25mm to 35mm, the diameter of the central hole in the main propellant charge 8 ranges from 25mm to 35mm, and the diameter of the central hole in the delay propellant charge 9 ranges from 0mm to 26mm. Among them, the function of the enhanced propellant column 7 is to further accelerate the formation of gas pressure by surrounding the ignition with gas, the function of the delayed propellant column 9 is to extend the duration of gas pressure by using end-face combustion, and the function of the main propellant column 8 is to ignite it through the ignition assembly to rapidly generate high-pressure gas.
[0052] Furthermore, in order to reduce the manufacturing cost of this device and the working conditions of the well shaft, the delayed-action propellant column 9 may not be installed on the ignition tube 5, and the main propellant column 8 and the reinforcing propellant column 7 are installed on the ignition tube 5.
[0053] like Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, a fixing connector 4 is connected to one end of the ignition tube 5 relative to the heat insulation body. The lower end of the fixing connector 4 is connected to the upper end of the ignition tube 5 by a thread, and the upper end of the fixing connector 4 is connected to the gun head 3 by a thread. The fixing connector 4 fixes the ignition tube 5 and the gunpowder column in the perforated gun barrel 6, ensuring the stability of the connection of each component in the perforated gun barrel 6.
[0054] like Figure 11 and Figure 12 As shown, the length of the perforated barrel 6 ranges from 1000mm to 3600mm, the outer diameter ranges from 89mm to 102mm, and the wall thickness ranges from 8mm to 13mm. The holes on the outer wall of the perforated barrel 6 can be one or more of round, elliptical, or flat holes. The inner diameter of the perforated barrel 6 is 80mm, the diameter of the holes on the perforated barrel 6 ranges from 30mm to 35mm, and the density of the holes on the outer wall of the perforated barrel 6 is 80 to 120 holes per meter. In this device, the perforated barrel 6 confines the gas produced by the combustion of the gunpowder column within it and then allows it to flow out through the holes, eliminating the thrust of the gas on the perforated barrel 6.
[0055] like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the heat insulation body includes a heat insulation buffer tube 2 with an outer diameter of 73mm and a length ranging from 500mm to 1000mm. One end of the heat insulation buffer tube 2 is connected to the gun head 3, and the other end is connected to the lifting ring 1. The outer wall of the heat insulation buffer tube 2 is provided with heat dissipation holes. The heat insulation buffer tube 2 can separate the cable joint from the gunpowder column, reduce the risk of the high-temperature gas generated after the gunpowder column burns and erodes the cable joint, and prevent the cable from burning out and causing the device to fall into the well.
[0056] like Figures 1-4 As shown, the lifting ring 1 includes a connecting section, in which an ignition wire is threaded, and the end of the ignition wire extends out of the connecting section to connect with the cable, so as to facilitate the connection and sealing of the ignition wire and the cable; one end of the connecting section is threaded to the end of the heat insulation buffer tube 2 away from the gun head 3, and the other end of the connecting section is connected to the lifting section.
[0057] like Figure 14 and Figure 15 As shown, the damping structure includes a towing rod 11 with an outer diameter of 25mm and a length ranging from 500mm to 1000mm. Threaded posts with an outer diameter of 24mm are provided at both ends of the towing rod 11. One end of the towing rod 11 is connected to the breech 10, and the other end is connected to a resistance hammer 12. The towing rod 11 isolates the breech 10 and the resistance hammer to form a stable body, increasing resistance. The resistance hammer 12 acts as a righting element during well lowering, facilitating operation. Simultaneously, when the propellant charge burns, it increases the resistance to aerodynamic disturbances affecting the device.
[0058] In this device, the ignition tube 5 is a conventionally used component in the art, and will be briefly explained here. It consists of an ignition head or detonator, ignition charge or detonating cord, aluminum tube, plug, and terminal block. The ignition tube must withstand downhole pressure and temperature to ensure no leakage and no spontaneous combustion. Two specific embodiments of the ignition tube 5 are presented below. Embodiment 1: The ignition tube 5 consists of a detonator, detonating cord, aluminum tube, plug, and terminal block. Embodiment 2: The ignition tube 5 consists of an ignition head, ignition charge, aluminum tube, plug, and terminal block. Through the above explanation, those skilled in the art should clearly understand the structure and function of the ignition tube 5.
[0059] When using this device, first assemble the ignition tube 5, ensuring a sufficiently long ignition wire is left to flow out. Multiple gunpowder charges are threaded evenly through the ignition tube. Then, a perforated gun barrel 6 is threaded through the gunpowder charges. The fixed connector 4 is threaded to the ignition tube 5. The gun head 3 and breech 10 are connected to the end of the perforated gun barrel 6. A drag bar 11 is connected to the breech 10, and a resistance hammer 12 is connected to the drag bar 11. A heat-insulating buffer tube 2 is connected to the gun head 3, and a lifting ring 1 is connected to the heat-insulating buffer tube 2. The ignition wire passes through the heat-insulating buffer tube 2, exits from the lifting ring 1, and connects to the cable. The ground work machine is suspended from the lifting ring 1 by a cable, and the device is raised to the wellhead position via the lifting ring 1. The resistance hammer 12 is first inserted into the well shaft, and then gradually lowered to the section of the well being worked on. Ignition is then achieved by energizing the device via the cable.
[0060] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.
Claims
1. A dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells, characterized in that, It includes an ignition tube (5), on which a gunpowder column is inserted; and an open-ended gun barrel (6) is inserted through the outside of the gunpowder column. One end of the perforated barrel (6) is connected to the breech (10), the breech (10) is connected to a damping structure, the other end of the perforated barrel (6) is connected to the head (3), the head (3) is connected to a heat insulation body, and the heat insulation body is connected to a lifting ring (1). An ignition wire is connected to the ignition tube (5). The ignition wire passes through the gun head (3) and the heat insulation body, and passes through the lifting ring (1) to connect with the cable.
2. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 1, characterized in that, The propellant column includes an enhanced propellant column (7), a main propellant column (8), and a delayed propellant column (9). The main propellant column (8) is inserted at the center of the ignition tube (5). The enhanced propellant column (7) is inserted on the side of the ignition tube (5) near the gun head (3), and the delayed propellant column (9) is inserted on the side of the ignition tube (5) near the gun breech (10).
3. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 1, characterized in that, A fixing connector (4) is connected to one end of the ignition tube (5) opposite to the heat insulation body. The end of the fixing connector (4) away from the ignition tube (5) is connected to the gun head (3) by a thread.
4. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 1, characterized in that, The length of the perforated barrel (6) ranges from 1000mm to 3600mm, the outer diameter of the perforated barrel (6) ranges from 89mm to 102mm, and the wall thickness of the perforated barrel (6) ranges from 8mm to 13mm.
5. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 4, characterized in that, The hole opened on the perforated gun barrel (6) is one or more of the following: round hole, elliptical hole and flat hole.
6. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 5, characterized in that, The aperture range on the perforated barrel (6) is 30mm~35mm.
7. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 1, characterized in that, The heat insulation body includes a heat insulation buffer tube (2), one end of which is connected to the gun head (3), and the other end of which is connected to the lifting ring (1). The heat insulation buffer tube (2) has heat dissipation holes on its outer wall.
8. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 7, characterized in that, The length of the heat insulation buffer tube (2) ranges from 500mm to 1000mm.
9. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 7, characterized in that, The lifting ring (1) includes a connecting section, in which the ignition wire is threaded, and the end of the ignition wire extends out of the connecting section and is connected to a cable; One end of the connecting section is connected to the end of the heat insulation buffer pipe (2) away from the gun head (3), and the other end of the connecting section is connected to the hoisting section.
10. The dynamic energy-concentrating gas pressure cracking plugging device for oil and gas wells according to claim 1, characterized in that, The damping structure includes a drag bar (11), one end of which is connected to the breech (10), and the other end of which is connected to a drag hammer (12).