Methane explosion fracturing structure in shale gas reservoir

Abstract

The present application provides a kind of shale gas reservoir methane combustion fracturing structure, it includes: stabilizing component, conveying component and packer component, stabilizing component is made of wellbore casing, and bottom packer and top packer are respectively fixedly installed in the inside of both ends of wellbore casing, conveying component is made of sucker rod string, and jet mechanism is fixedly installed in the inside of sucker rod string, packer component is fixedly installed to the inner wall of wellbore casing, and guide column is arranged in the inside of packer component.This application realizes the conveying of fuel and combustion improver in the inside of wellbore casing by using sucker rod string, and realizes the filling of fuel by using conveying component in sucker rod string, realizes the conveying of high-pressure gas by the cooperation of sand blasting pipe and air inlet pipe, realizes the storage of solid fuel by the cooperation of fracture, realizes the sequential conveying of fuel and combustion improver by packer component, and realizes the automatic opening of packer component by using the gas pressure generated during conveying, can realize the mixing of gas after sequential conveying in well, and can also improve the safety performance of combustion operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a shale gas reservoir methane combustion fracturing structure, belonging to the technical field of shale gas reservoir exploitation. BACKGROUND

[0002] Shale gas reservoir methane combustion fracturing is an innovative shale gas exploitation technology. Shale gas is usually present in dark shale, high-carbon shale and other gas-producing rocks in adsorbed and free states, and is a clean and efficient energy resource. However, compared with conventional natural gas reservoirs, shale gas reservoirs generally have low porosity and low permeability, which makes their exploitation more difficult. In order to improve the recovery of shale gas, fracturing reconstruction technology is widely used in the development of shale gas reservoirs. Although traditional hydraulic fracturing technology can form relatively long fractures, the expansion form and direction of the fractures are relatively limited, and there are risks such as large water resource consumption and environmental pollution. Therefore, it is particularly important to develop a new and more efficient fracturing technology. Shale reservoir methane combustion fracturing technology uses the methane gas generated by in-situ desorption of shale gas reservoirs and the injected combustion-supporting agent (such as oxygen) to co-burn and produce high-temperature and high-pressure gas to impact and fracture the shale reservoir. This technology produces high-temperature and high-pressure shock waves and explosive gases in a very short time through the combustion reaction of methane, which acts on the shale reservoir to produce and expand fractures, thereby building a complex fracture network to provide efficient migration channels for shale gas.

[0003] As a new type of waterless fracturing technology, methane combustion fracturing technology has broad application prospects in the field of shale gas exploitation. With continuous development and improvement, it is expected to become one of the mainstream technologies for future shale gas exploitation, contributing to China's energy security and sustainable development. Methane combustion fracturing technology can form a complex and efficient fracture network, increasing the migration channels of shale gas and thus improving the recovery. This technology does not require the consumption of a large amount of fracturing fluid, avoiding the problems of large water consumption and environmental pollution. At the same time, since it does not involve the transportation and mixing of explosives on the ground, it also reduces the safety risks. Methane combustion fracturing technology is suitable for different types of shale reservoirs, including deep coalbed methane reservoirs that are difficult to fracture using traditional hydraulic fracturing technology.

[0004] Shale gas reservoir methane combustion fracturing is an innovative and forward-looking shale gas exploitation technology that uses methane gas in the reservoir and combustion-supporting agent to achieve combustion fracturing. In actual production, due to the small gap between the fractures produced by the initial fracturing, it may be difficult to achieve fracturing effects with a fixed amount of methane gas, especially when the fuel cannot effectively fill the fractures, resulting in reduced subsequent fracturing effects. In addition, during the transportation of methane gas and combustion-supporting agent, there is a mixing and transportation process on the well, which may pose safety risks during actual production and make it difficult to achieve effective mixing after injection, affecting the efficiency of combustion fracturing. SUMMARY

[0005] The present application provides a shale gas reservoir methane combustion fracturing structure to solve the technical problems of poor combustion fracturing effect and low safety in transportation.

[0006] The present application solves the above technical problems by the following technical solutions:

[0007] The present application provides a shale gas reservoir methane combustion fracturing structure, which comprises:

[0008] A stabilizing assembly is composed of a wellbore casing, which is arranged inside a vertical shaft opened in a shale layer, and a bottom packer and a top packer are fixedly installed at both ends of the wellbore casing.

[0009] A conveying assembly is arranged inside the wellbore casing and is composed of a sucker rod string, a jet mechanism is fixedly installed inside the sucker rod string, an end pipe is fixedly installed at the bottom of the sucker rod string, and the jet mechanism extends into the end pipe.

[0010] A sealing assembly is fixedly installed to the inner wall of the wellbore casing, a plurality of uniformly distributed guide columns are arranged inside the sealing assembly, and the sealing assembly is arranged between the top packer and the bottom packer.

[0011] In the present technical solution, a plurality of wellbore casings are uniformly embedded in the shale layer, a plurality of vertical shafts are arranged inside the shale layer, the vertical shafts extend into the shale gas reservoir, an ignition switch is fixedly installed inside the wellbore casing, and the ignition switch is located above the bottom packer.

[0012] In the present technical solution, the bottom packer is arranged at the bottom of the vertical shaft, the top packer is arranged inside the wellbore casing at the top of the vertical shaft, the number of top packers is two, the two top packers are sequentially arranged on the inner wall of the wellbore casing, a pressure sensor is arranged between the two top packers, and the pressure sensor is uniformly arranged between the two top packers.

[0013] In the present technical solution, a plurality of uniformly distributed openings are arranged on the surface of the wellbore casing, the openings are correspondingly arranged with the conveying assembly, a fracturing gap is formed in the shale layer on one side of the opening, and the fracturing gap is uniformly distributed in the shale gas reservoir at an inclined downward angle.

[0014] The oil extraction pipe column surface is respectively fixedly connected with a top packer and a packer assembly, two internal packers are fixedly connected inside the oil extraction pipe column, one of the internal packers is arranged at the top of the oil extraction pipe column and is above the other internal packer, the oil extraction pipe column fixedly connected with the other internal packer is provided with a communication pipe, the communication pipe is arranged between the two internal packers, the communication pipe is correspondingly arranged above the packer assembly, and the end of the communication pipe is fixedly connected with a valve.

[0015] In the technical solution, the diameter of the end pipe is larger than that of the oil extraction pipe column, and a plurality of uniformly distributed circular holes are arranged on the surface of the end pipe and above the jet mechanism.

[0016] In the technical solution, the jet mechanism is composed of an air inlet pipe and a sand blasting pipe, the air inlet pipe is fixedly connected with the inner wall of the oil extraction pipe column, the air inlet pipe extends into the inside of the end pipe and is fixedly connected with the inner wall of the end pipe, the sand blasting pipe is arranged in the middle of the oil extraction pipe column, the bottom end of the sand blasting pipe is connected with the air inlet pipe through a plurality of branch pipes, and the bottom of the air inlet pipe is in a bent structure and is connected with the bottom of the end pipe.

[0017] In the technical solution, the number of the air inlet pipes is several, the edges of the internal packers are fixedly connected with the air inlet pipes, the middle of the internal packer is fixedly connected with the sand blasting pipe, the bottom of the sand blasting pipe is in a bent structure, a plurality of uniformly distributed booster nozzles are fixedly installed on the outer surface of the end pipe, each booster nozzle is in an inclined structure and is in communication with the inside of the end pipe, and the booster nozzle is in communication with one end of the air inlet pipe.

[0018] In the technical solution, the packer assembly is composed of a middle packer, the middle packer is fixedly installed into the inside of the wellbore casing, the middle packer is arranged in the middle of the wellbore casing and is fixedly connected with the surface of the oil extraction pipe column, the middle packer is in an annular structure, and the inside of the middle packer is penetrated and inserted with a plurality of guide columns.

[0019] In the technical solution, the guide column is in a cylindrical structure, a fixed shaft is fixedly connected with the bottom end of the guide column, the edge of the top of the fixed shaft is fixedly connected with a sealing ring, the sealing ring is attached to the bottom surface of the middle packer, an activity shaft is sleeved on the surface of the guide column at the top of the middle packer, a notch is arranged on the surface of the guide column above the activity shaft, the top surface of the middle packer is rotatably connected with a clamping rod, the clamping rod is in a bent structure and is embedded and clamped in the notch, and the bent position of the clamping rod is in contact with the edge of the top of the activity shaft.

[0020] On the basis of conforming to the common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, that is, the preferred examples of the present application are obtained.

[0021] The positive progress effect of the present application is that:

[0022] The methane explosion fracturing structure for shale gas reservoirs proposed above utilizes a pumping string to transport fuel and combustion aid inside the wellbore casing, and utilizes a delivery assembly in the pumping string to realize fuel filling. High-pressure gas delivery can be realized through the cooperation of a sandblasting tube and an air inlet pipe, and the original fractures can be filled densely, and solid fuel can be stored in the fractured gaps to solve the problem of low fuel reserves in the fractures, providing a basis for subsequent efficient explosion. The fuel and combustion aid are transported in sequence through the isolation assembly, and the air pressure generated during the transportation process is utilized to realize the automatic opening of the isolation assembly. The gas mixing after sequential transportation can be realized underground, avoiding the potential safety hazards caused during transportation on the well. When ignited, the fuel and methane gas can be exploded in the well, ensuring the fracturing effect and improving the safety performance of the explosion operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the wellbore casing of the present invention.

[0025] Figure 3 It is a schematic diagram of the internal structure of the wellbore casing according to the present invention.

[0026] Figure 4 For the present invention Figure 3 Enlarged structural diagram of the A department in the middle.

[0027] Figure 5 It is a schematic diagram of the half-cut three-dimensional structure of the present invention.

[0028] Figure 6 It is a schematic diagram of the internal three-dimensional structure of the oil pumping string of the present invention.

[0029] Figure 7 It is a schematic diagram of the three-dimensional structure of the conveying component of the present invention.

[0030] Figure 8 For the present invention Figure 7 Schematic diagram of the locally enlarged structure at point B in the middle.

[0031] Figure 9 It is a schematic diagram of the internal structure of the middle packer of the present invention.

[0032] Figure 10 It is a schematic diagram of the front view structure of the wellbore casing of the present invention.

[0033] Description of Reference Numerals

[0034] 100, stabilization assembly; 101, wellbore casing; 102, bottom packer; 103, ignition switch; 104, top packer; 105, pressure sensor; 106, opening; 107, shale layer; 108, vertical shaft; 109, fracture gap;

[0035] 200, conveying assembly; 201, pumping string; 202, internal packer; 203, connecting pipe; 204, end pipe; 205, circular hole; 206, air inlet pipe; 207, sandblasting pipe; 208, booster nozzle;

[0036] 300, packing assembly; 301, middle packer; 302, guide column; 303, fixed shaft; 304, sealing ring; 305, movable shaft; 306, clamping rod. DETAILED DESCRIPTION

[0037] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0038] like Figures 1-10 As shown, the shale gas reservoir methane explosion fracturing structure includes:

[0039] A stabilization assembly 100, comprising a wellbore casing 101, which is disposed within a vertical shaft 108 formed in a shale layer 107. A bottom packer 102 and a top packer 104 are fixedly mounted at both ends of the wellbore casing 101.

[0040] The conveying assembly 200 is disposed inside the wellbore casing 101 and is composed of a pumping string 201. A jet mechanism is fixedly installed inside the pumping string 201. An end pipe 204 is fixedly installed at the bottom of the pumping string 201, and the jet mechanism extends into the end pipe 204.

[0041] The packer assembly 300 is fixedly mounted to the inner wall of the wellbore casing 101 . A plurality of evenly distributed guide columns 302 are provided inside the packer assembly 300 . The packer assembly 300 is disposed between the top packer 104 and the bottom packer 102 .

[0042] The number of the wellbore casing 101 is several and is uniformly embedded into the shale layer 107, the shale layer 107 is internally provided with several shafts 108, and the shaft 108 extends into the shale gas reservoir, the ignition switch 103 is fixedly installed in the wellbore casing 101, and the ignition switch 103 is located above the bottom packer 102; the bottom packer 102 is arranged at the bottom of the shaft 108, the top packer 104 is arranged in the wellbore casing 101 at the top of the shaft 108, the number of the top packer 104 is two, the two top packers 104 are sequentially arranged on the inner wall of the wellbore casing 101, and the pressure sensor 105 is arranged between the two top packers 104, and the pressure sensor 105 is uniformly arranged between the two top packers 104.

[0043] In the technical solution, a plurality of shafts 108 are arranged in the shale gas reservoir, the wellbore casing 101 is arranged in the shaft 108, the pressure cracking gap 109 is formed in the shale gas reservoir by pre-cracking, and after the solid fuel and the combustion-supporting agent are filled in the wellbore casing 101, the ignition switch 103 is used to ignite, the combustion and explosion gas is blocked by the bottom packer 102 and the top packer 104, the high-pressure gas is used to further extend the pressure cracking gap 109, the two top packers 104 are arranged to ensure the sealing performance, and the pressure sensor 105 is arranged between the two top packers 104 to monitor the pressure in the combustion and explosion process, and the safety performance in the combustion and explosion process is ensured.

[0044] The wellbore casing 101 is provided with a plurality of uniformly distributed openings 106, the openings 106 are correspondingly arranged with the conveying assembly 200, the pressure cracking gap 109 is formed in the shale layer 107 on one side of the opening 106, and the pressure cracking gap 109 is uniformly distributed into the shale gas reservoir at an inclined downward angle; the sucker rod string 201 is fixedly connected with the top packer 104 and the packer assembly 300, the two internal packers 202 are fixedly connected in the sucker rod string 201, one of the internal packers 202 is arranged at the top of the sucker rod string 201, the sucker rod string 201 above the other internal packer 202 is fixedly connected with the communication pipe 203, the communication pipe 203 is arranged between the two internal packers 202, the communication pipe 203 is arranged above the packer assembly 300, and the end of the communication pipe 203 is fixedly connected with the valve.

[0045] In the technical solution, the opening 106 is used for gas delivery. After the pre-fracturing to form the fracturing fissure 109, the directions of the fracturing fissure 109 are inconsistent. The high-pressure gas is delivered to the opening 106 through the gas inlet pipe 206, and the sand is delivered into the gas inlet pipe 206 through the sand injection pipe 207. The sand is made to enter the booster nozzle 208 at high speed by the airflow generated by the gas inlet pipe 206. The airflow sprayed by the booster nozzle 208 enters the fracturing fissure 109, so that the expansion of the fracturing fissure 109 is realized. The inclination angle of the booster nozzle 208 is used to make the inclination angle of the fracturing fissure 109 downward, so as to provide storage space for subsequent fuel filling.

[0046] The end pipe 204 has a diameter larger than that of the oil pumping string 201. A plurality of uniformly distributed circular holes 205 are arranged on the surface of the end pipe 204 and are located above the jet mechanism. The jet mechanism is composed of the gas inlet pipe 206 and the sand injection pipe 207. The gas inlet pipe 206 is fixedly connected to the inner wall of the oil pumping string 201. The gas inlet pipe 206 extends into the end pipe 204 and is fixedly connected to the inner wall of the end pipe 204. The sand injection pipe 207 is arranged in the middle of the oil pumping string 201 and is connected to the gas inlet pipe 206 through a plurality of branch pipes at the bottom end. The bottom of the gas inlet pipe 206 is in a bent structure and is connected to the bottom of the end pipe 204. The number of the gas inlet pipes 206 is several. The plurality of gas inlet pipes 206 are fixedly connected to the edge of the inner packer 202. The middle of the inner packer 202 is fixedly connected to the sand injection pipe 207. The bottom of the sand injection pipe 207 is in a bent structure. A plurality of booster nozzles 208 are fixedly arranged on the outer surface of the end pipe 204. Each booster nozzle 208 is in an inclined structure and is in communication with the inside of the end pipe 204. The booster nozzles 208 are in communication with one end of the gas inlet pipe 206.

[0047] In the technical solution, when the expansion of the fracturing fissure 109 is completed, the inner packer 202 is closed. The gas fuel is delivered through the gas inlet pipe 206, and the solid fuel is delivered into the booster nozzle 208 through the sand injection pipe 207. The high-speed flow of the solid fuel is delivered into the fracturing fissure 109 through the booster nozzle 208. The filling content of the solid fuel is improved, more fuel is stored in the fracturing fissure 109, and the subsequent fuel explosion effect is ensured.

[0048] The packer assembly 300 is composed of a middle packer 301, which is fixedly installed inside the wellbore casing 101. The middle packer 301 is located in the middle of the wellbore casing 101 and is fixedly connected to the surface of the pumping pipe 201. The middle packer 301 is an annular structure, and the middle packer 301 is connected to a plurality of guide columns 302; the guide columns 302 are cylindrical structures, and the bottom end of the guide columns 302 is fixedly connected to a fixed shaft 303. The fixed shaft 303 is a cylindrical structure. The top edge is fixedly connected to the sealing ring 304, and the sealing ring 304 is fitted and connected to the bottom surface of the middle packer 301. The surface of the guide column 302 located at the top of the middle packer 301 is sleeved with a movable shaft 305, and a notch is provided on the surface of the guide column 302 located above the movable shaft 305. The top surface of the middle packer 301 is rotatably connected to the clamping rod 306. The clamping rod 306 is a bent structure and is engaged with the inside of the notch, and the bent position of the clamping rod 306 is in contact with the top edge of the movable shaft 305.

[0049] In this technical solution, after the fuel is transported to the inside of the wellbore casing 101 by using the air inlet pipe 206 and the sandblasting pipe 207, the pressure inside the wellbore casing 101 is increased by the high-pressure gas filling. At this time, the sealing ring 304 at the fixed shaft 303 is deformed and forces the guide column 302 and the fixed shaft 303 to move upward. The sealing performance of the connection is always ensured during the upward movement of the guide column 302. When the guide column 302 moves upward, it is separated from the clamping rod 306. At this time, the air pressure at the bottom of the wellbore casing 101 keeps the guide column 302 in its original state. After closing the air inlet pipe 206 and the sandblasting pipe 207, the lower The internal packer 202 of the square is opened and the valve on the connecting pipe 203 is opened to transport the combustion-supporting agent from the pumping pipe 201. The combustion-supporting agent is transported to the space between the wellbore casing 101 and the pumping pipe 201 through the connecting pipe 203. When the content of the injected combustion-supporting agent increases, the air pressure generated at this time keeps it balanced with the air pressure at the bottom. When the air pressure is the same, the guide column 302 falls under its own weight, and the clamping rod 306 will not recover after being opened, so that the guide column 302 will fall out from the inside of the movable shaft 305. After the guide column 302 is opened, the combustion-supporting agent and fuel located on the upper and lower sides of the middle packer 301 are mixed.

[0050] Further, the combustion-supporting agent is mainly oxygen, and the gas fuel can adopt methane gas, because the density of methane gas is lower than that of oxygen, when the middle packer 301 is opened, the methane gas and the combustion-supporting agent complete mixing, when the mixing is completed, the ignition switch 103 is started, the fuel realizes combustion and explosion in the wellbore casing 101, at this time, the combustion gas ignites the solid fuel in the fracturing gap 109, a large amount of gas is forced to make the fracturing gap 109 further expand and extend, thereby ensuring the effect of the combustion and explosion fracturing of the shale gas reservoir, and the combustion-supporting agent and the fuel are mixed in the shaft 108 by using gas pressure, avoiding the safety accidents possibly caused by mixing the fuel and the combustion-supporting agent on the well, improving the safety of the combustion and explosion construction, and further fracturing operation is realized by filling the fuel in the fracturing gap 109, improving the combustion and explosion effect.

[0051] The present application is not limited to the above-mentioned embodiments, and any changes in shape or structure fall within the scope of the present application. The scope of the present application is defined by the appended claims, and those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of the present application.

Claims

1. Shale gas reservoir methane explosion fracturing structure, characterized by: The shale gas reservoir methane explosion fracturing structure includes: A stabilizing assembly (100), the stabilizing assembly (100) comprising a wellbore casing (101), the wellbore casing (101) being arranged inside a vertical shaft (108) opened in a shale layer (107), with a bottom packer (102) and a top packer (104) being fixedly installed inside both ends of the wellbore casing (101); A conveying assembly (200), the conveying assembly (200) being arranged inside a wellbore casing (101), the conveying assembly (200) being composed of a pumping string (201), a jet mechanism being fixedly installed inside the pumping string (201), an end pipe (204) being fixedly installed at the bottom of the pumping string (201), and the jet mechanism extending into the end pipe (204); A packing assembly (300), wherein the packing assembly (300) is fixedly mounted to the inner wall of the wellbore casing (101), a guide column (302) is provided inside the packing assembly (300), and the guide columns (302) are evenly distributed to the edge of the packing assembly (300), and the packing assembly (300) is arranged between the top packer (104) and the bottom packer (102); The surface of the wellbore casing (101) is provided with a plurality of evenly distributed openings (106), the openings (106) are distributed correspondingly to the conveying assembly (200), a fracture gap (109) is formed inside the shale layer (107) on one side of the opening (106), and the fracture gap (109) is evenly distributed in the shale gas reservoir at an angle inclined downward; the diameter of the end pipe (204) is larger than the diameter of the pumping pipe string (201), the surface of the end pipe (204) is provided with a plurality of evenly distributed circular holes (205), and the circular holes (205) are located above the jet mechanism; the jet mechanism is composed of an air inlet pipe (206) and a sandblasting pipe (207), the air inlet pipe (206) is fixedly connected to the inner wall of the pumping pipe string (201), the air inlet pipe (206) extends to the inside of the end pipe (204) and is connected to the end pipe (207). 4) The inner wall is fixedly connected, the sandblasting pipe (207) is arranged in the middle of the pumping pipe string (201), and the bottom end of the sandblasting pipe (207) is connected to the air inlet pipe (206) through a plurality of branch pipes, the bottom of the air inlet pipe (206) is a bent structure and is connected to the bottom of the end pipe (204); the number of the air inlet pipes (206) is several, and the plurality of air inlet pipes (206) are fixedly connected to the edge of the internal packer (202), the middle of the internal packer (202) is fixedly connected to the sandblasting pipe (207), the bottom of the sandblasting pipe (207) is a bent structure, and the outer surface of the end pipe (204) is fixedly installed with a plurality of uniformly distributed boosting nozzles (208), each boosting nozzle (208) is an inclined structure and is connected to the inside of the end pipe (204), and the boosting nozzle (208) is connected to one end of the air inlet pipe (206).

2. The shale gas reservoir methane explosion fracturing structure according to claim 1, characterized in that: The number of the wellbore casings (101) is several and they are evenly distributed and embedded in the shale layer (107). The shale layer (107) is provided with several vertical shafts (108), and the vertical shafts (108) extend into the shale gas reservoir. An ignition switch (103) is fixedly installed inside the wellbore casing (101), and the ignition switch (103) is located above the bottom packer (102).

3. The shale gas reservoir methane explosion fracturing structure according to claim 2, characterized in that: The bottom packer (102) is arranged at the bottom of the vertical shaft (108), and the top packer (104) is located inside the wellbore casing (101) at the top of the vertical shaft (108). There are two top packers (104), and the two top packers (104) are distributed in sequence to the inner wall of the wellbore casing (101). A pressure sensor (105) is provided between the two top packers (104), and the pressure sensor (105) is evenly arranged between the two top packers (104).

4. The shale gas reservoir methane explosion fracturing structure according to claim 1, characterized in that: The surface of the sucker pipe (201) is fixedly connected to the top packer (104) and the packer assembly (300) respectively. Two internal packers (202) are fixedly connected to the inside of the sucker pipe (201), one of the internal packers (202) is arranged at the top of the sucker pipe (201), and the sucker pipe (201) located above the other internal packer (202) is fixedly connected to a connecting pipe (203). The connecting pipe (203) is arranged between the two internal packers (202). The connecting pipe (203) is correspondingly arranged above the packer assembly (300), and the end of the connecting pipe (203) is fixedly connected to the valve.

5. The shale gas reservoir methane explosion fracturing structure according to claim 1, characterized in that: The packing assembly (300) is composed of a middle packer (301), which is fixedly installed inside the wellbore casing (101). The middle packer (301) is located in the middle of the wellbore casing (101) and is fixedly connected to the surface of the pumping pipe (201). The middle packer (301) is an annular structure, and the middle packer (301) is inserted into a plurality of guide columns (302).

6. The shale gas reservoir methane explosion fracturing structure according to claim 5, characterized in that: The guide column (302) is a cylindrical structure, and the bottom end of the guide column (302) is fixedly connected to a fixed shaft (303), the top edge of the fixed shaft (303) is fixedly connected to the sealing ring (304), and the sealing ring (304) is closely connected to the bottom surface of the middle packer (301), the surface of the guide column (302) located at the top of the middle packer (301) is sleeved with a movable shaft (305), and a notch is opened on the surface of the guide column (302) located above the movable shaft (305), and the top surface of the middle packer (301) is rotatably connected to the clamping rod (306), the clamping rod (306) is a bent structure and is engaged with the inside of the notch, and the bent position of the clamping rod (306) contacts the top edge of the movable shaft (305).

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