Underwater liquid oxygen explosion fracturing device and manufacturing process thereof

Abstract

The invention provides an underwater liquid oxygen explosion fracturing device and a manufacturing process thereof, the underwater liquid oxygen explosion fracturing device comprises a fracturing device, a liquid injection pipe, an exhaust pipe, an electric ignition device and a biomass fuel core body, the biomass fuel core body is arranged in the fracturing device, the fracturing device is made of a macromolecule, high-density polyethylene or nylon 12 thermoplastic material, the fracturing device is provided with two or more pipe caps, and the pipe caps are arranged in the fracturing device. The cracking device has waterproof sealing and is good in air tightness, the electric ignition device is provided with an electric ignition head and an electric ignition wire, the gas explosion operation efficiency is high, the operability is extremely high, and the assembled cracking device is safe, reliable, good in gas explosion effect, low in blasting vibration and water impact breaking strength and small in influence range. Toxic and harmful blasting products are few, and the underwater reef blasting construction technology is environmentally friendly, efficient and safe.

Description

Technical Field

[0001] The invention relates to the technical field of underwater liquid oxygen gas explosion, and in particular to an underwater liquid oxygen gas explosion fracturing device and a manufacturing process thereof. Background Art

[0002] With the widespread application of engineering technology, underwater blasting is an important part of engineering blasting. In the national economic construction and national defense engineering construction, underwater blasting is widely used in port and terminal construction, dock construction, channel dredging, water conservancy and hydropower, roads and bridges, underwater pipeline laying and other engineering construction fields.

[0003] As the main container of combustible materials and liquid oxygen, the fracturing device is a key component of liquid oxygen explosion, especially underwater liquid oxygen explosion, and is crucial to the operational safety and gas explosion effect of liquid oxygen explosion. After repeated tests and verifications, the two main types of fracturing devices suitable for underwater liquid oxygen explosion coke engineering applications are glass fiber reinforced plastic fracturing devices and thermoplastic material fracturing devices such as polymer, high-density polyethylene or nylon 12. Among them, thermoplastic material fracturing devices such as polymer, high-density polyethylene or nylon 12, compared with glass fiber reinforced plastic fracturing devices, not only have the same characteristics of good low-temperature performance, high strength, waterproof sealing, heat insulation, green environmental protection, etc., but also have simpler structures, easier processing, convenient factory production, and lower costs. However, hot-melt material fracturing devices such as polymer polyethylene and nylon 12 have high assembly technology requirements and require many tools and equipment. If you are not careful, it is easy to cause water seepage and air leakage in the fracturing device pipe body and joints, and even cracking at the joints, which will cause great difficulties for underwater liquid oxygen explosion and seriously affect the effect, progress and operational safety of underwater liquid oxygen explosion. Summary of the invention

[0004] The present invention provides an underwater liquid oxygen explosion fracturing device and a manufacturing process thereof. The underwater liquid oxygen explosion fracturing device adopts a welding assembly process method of underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic material fracturing devices. After trial use under multiple underwater liquid oxygen explosion scene conditions, the gas explosion operation efficiency is high, the operability is extremely strong, the assembled fracturing device is safe and reliable, and the gas explosion effect is good. It is a simple, easy-to-use, reliable, efficient, economical and applicable underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic material fracturing device and its assembly welding process method.

[0005] To solve the above problems, the present invention provides an underwater liquid oxygen explosion fracturator and a manufacturing process thereof, comprising a fracturator, an injection pipe, an exhaust pipe, an electric ignition device and a biomass fuel core. The biofuel core is installed in the fracturator. The material of the fracturator is a polymer, high-density polyethylene or nylon 12 thermoplastic material. The fracturator is provided with two or more pipe caps. The fracturator has a waterproof seal and good airtightness. The electric ignition device is provided with an electric ignition head and an electric ignition wire.

[0006] A further solution is that the biomass fuel core includes liquid oxygen explosion paper, or is made of combustible raw materials such as straw powder, wood powder, and carbon powder.

[0007] A further solution is that the low temperature performance of the material of the cracking device can require that the material does not crack or deform in a low temperature environment of 180°C and has a certain strength.

[0008] A further solution is that the fracturing device has a low thermal conductivity, good thermal insulation, and can be hot-melt processed.

[0009] A further solution is that the thickness of the tube body of the fracturing device is 3.5-6.0 mm, and the thickness of the tube cap structure is 7-10 mm.

[0010] A further solution is that the underwater liquid oxygen explosion fracturing device and its welding assembly include a fracturing device, an exhaust pipe, a liquid injection pipe, a biomass core, an electric ignition head, an electric ignition wire and a manufacturing tool, wherein the number of the electric ignition heads in each fracturing device is not less than two, and the manufacturing tools include a pipe body welding machine, a plug-in welding machine for pipe caps and exhaust pipes, a hand drill, an edge planer, a through-hole shaping and a detection instrument;

[0011] The manufacturing process of the underwater liquid oxygen explosion fracturing device, the specific method and steps are as follows:

[0012] S01. Prepare the pipes for the fracturing device. According to the design parameters of the gas explosion project, use round pipes of corresponding specifications and sizes;

[0013] S02. Use a pipe cap with the same material as the pipe of the fracturing device, with an outer diameter and a wall thickness not less than the wall thickness of the pipe. Two pipe caps are required to assemble a set of fracturing devices, namely an upper pipe cap and a lower pipe cap;

[0014] S03, making biomass string core and installing electric ignition device;

[0015] S04, assembling the pipe cap: using an electric drill to drill a circular hole with a diameter slightly smaller than the outer diameter of the exhaust pipe at an eccentric position of the top cover of the upper pipe cap, using a plug-in welder to plug-weld the exhaust pipe to the circular hole of the pipe cap, and at the same time using a through-hole shaping rod to insert into the welding position from the exhaust pipe opening in the pipe cap and keep it in position, and cool to form;

[0016] S05. Assemble the pipe body: Place the pipe cap welded with the exhaust pipe and a certain length of pipe body on the butt welding machine respectively. First, use the matching electric milling cutter to mill and flatten the joint between the pipe cap and the pipe body. Then, place the matching electric heating plate on the joint to heat and melt. After removing the heating plate, continue to apply a certain pressure with the butt welding machine to press and weld the pipe body and the pipe cap, and cool to form.

[0017] S06. Pipe threading and core loading: Use a threader to pass the injection tube and ignition wire in the processed biomass string through the processed splitter body and exhaust pipe from the inside to the outside, and slowly load the entire biomass string into the splitter tube body by pushing and pulling forward and backward to form a semi-finished splitter. Do not force the biomass string into the pipe, do not change the shape and density of the biomass string, and do not damage the electric ignition device; and use the ohmmeter of the detection device to detect the integrity of the electric ignition device;

[0018] S07, closing the pipe body: the semi-finished product of the fracturing device and another pipe cap are respectively placed and fixed on the butt welding machine, firstly, the butt joint of the pipe cap and the semi-finished product of the fracturing device is milled and cut flat with a matching electric milling cutter, and then the matching electric heating plate is placed on the butt joint to heat and melt, and after removing the heating plate, a certain pressure is continuously applied with the butt welding machine to press and weld the semi-finished product of the fracturing device and the pipe cap, and the product is formed by cooling and forming, so as to form a finished product of the fracturing device;

[0019] S08, planing and forming: using a planer to plan the weld flange convex ring on the external pipe body of the fracturing device;

[0020] S09. Seal pipe ends: Use waterproof tape to make waterproof seals on the ends of the exhaust pipe and injection pipe to prevent water, mud and debris from entering the exhaust pipe and injection pipe during underwater operations, which may affect the normal function of the fracturing device.

[0021] S10. Exhaust pipe coil binding: To facilitate transportation and on-site operations and prevent pipeline damage, the exhaust pipe coil should be bound with tape;

[0022] S11. Marking numbers: After each set of liquid oxygen explosion fracturing device is completed, numbers are marked on the tube body and the end of the exhaust pipe of the fracturing device, and the marking includes at least row number, hole position and other information;

[0023] S12. The above process completes the manufacturing process of the underwater liquid oxygen explosion fracturing device.

[0024] A further solution is that in step S03, the method of making the biomass string core and installing the electric ignition device is as follows:

[0025] S031. Use a hand drill to drill a row of injection holes (with a hole diameter of 3 to 5 mm) at intervals of 40 to 60 cm in the length of the injection tube that is expected to be placed in the fracturing device tube body;

[0026] S032, connecting the combustible biomass cores (or paper rolls) into a string using a liquid injection tube, the length of which is adapted to the length of the cracking device tube;

[0027] S033, placing the electric ignition heads at the 1 / 5 and 4 / 5 positions at the lower end of the pipe string respectively, and the electric ignition heads should be in close contact with the combustible biomass core;

[0028] S034. The electric ignition head foot wires are connected in parallel and then in series with the electric ignition lead wires. The connection points are wrapped with insulating tape and fixed to the biomass core with tape.

[0029] A further solution is that in the step S06, when the pipe body of the fracturing device is welded, the welding of the pipe body and the pipe cap should be aligned and smooth without misalignment, the weld seam should be planed smoothly, and the outer diameter of the circumference of the weld seam should not be larger than the pipe diameter of the fracturing device.

[0030] A further solution is that at the joint welding point between the exhaust pipe and the pipe cap, there should be no blockage in the exhaust pipe and the inner diameter should not be necked down.

[0031] A further solution is that during the planing and welding operations, the operators should wear gloves and pay attention to electrical safety to avoid burns and planing injuries.

[0032] The beneficial effects of the present invention are: the fracturing device including a fracturing device, a liquid injection pipe, an exhaust pipe, an electric ignition device and a biomass fuel core, the underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic materials have a simple structure and are environmentally friendly, and the welding assembly process method has the following advantages:

[0033] 1. The present invention has a simple structure and high integration. From the outside, there are only four major components: the fracturing device housing, the upper and lower pipe caps, and the exhaust pipe. The biggest advantage is that the three pipelines of the traditional liquid oxygen explosion, the injection pipe, the exhaust pipe, and the electric ignition wire, are integrated together, and the injection pipe and the electric ignition wire are placed in the exhaust pipe.

[0034] 2. The present invention adopts hot-melt material as the main material of the fracturing device, which is convenient for flexible processing and assembly of various fracturing devices on site according to the actual project, and the hot-melt welding process equipment is relatively simple, the welding is firm, the air tightness is good, and the fracturing device is well formed.

[0035] 3. The present invention adopts hot-melt material as the main material of the fracturing device, which not only has good low-temperature resistance and high strength, but also has thermal insulation and electrical insulation. Under the premise of ensuring the safety of liquid oxygen explosion operation, it reduces the heat exchange between liquid oxygen and surrounding water bodies, rocks and other media, reduces the loss of liquid oxygen due to heat vaporization during operation, and improves the utilization rate of liquid oxygen.

[0036] 4. The present invention uses high-density, high-molecular polyethylene, nylon 12 and other materials as the main materials of the fracturing device, all of which are general materials with wide sources, safety and reliability, and low cost, which are convenient for large-scale liquid oxygen explosion engineering applications.

[0037] 5. The present invention follows the concept of green environmental protection in the whole process from materials to processing, from gas explosion operation to detonation. In the gas explosion process, only biomass is burned, liquid oxygen is vaporized, and the fracturing device is ruptured into fragments, which are then recycled and reused. No toxic or harmful substances are produced in the whole process.

[0038] 6. The exhaust pipe coils are tied and numbered to facilitate transportation and on-site operations.

[0039] The above welding and assembly process has high gas explosion efficiency and strong operability under the application conditions of multiple underwater liquid oxygen explosion scenarios. The assembled fracturing device is safe and reliable, and the gas explosion effect is good. It is a simple, easy-to-use, reliable, efficient, and economical underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic material fracturing device welding and assembly process method. Compared with traditional explosive blasting, the underwater liquid oxygen explosion of the present invention has low blasting vibration and underwater impact strength, and a small impact range; the blasting has few toxic and harmful products, and has little harm to aquatic organisms. It is a green, environmentally friendly, efficient and safe underwater reef blasting construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the assembly process of an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the assembly structure of the fracturing device tube body according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the exploded structure of the fracturing device tube body according to an embodiment of the present invention;

[0043] Figure 4 FIG. 4 is a method schematic diagram of step S03 of an embodiment of the present invention.

[0044] Reference numerals

[0045] 1. Exhaust pipe; 2. Liquid injection pipe; 3. Electric ignition wire; 4. Welding point between exhaust pipe and pipe cap; 5. Fracturer pipe body; 6. Lower pipe cap; 7. Upper pipe cap; 8. Drilling hole of upper pipe cap. DETAILED DESCRIPTION

[0046] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with the accompanying drawings and specific embodiments below, but is not limited thereto.

[0047] like Figures 1 to 4 As shown, the specific embodiment of the present invention, the underwater liquid oxygen explosion fracturing device and the manufacturing process thereof, comprises a fracturing device, a liquid injection pipe 2, an exhaust pipe 1, an electric ignition device and a biomass fuel core body, the fracturing device is equipped with a biomass fuel core body, the material of the fracturing device is a polymer, high-density polyethylene or nylon 12 thermoplastic material, the fracturing device is provided with two or more pipe caps 7, the fracturing device has a waterproof seal and good air tightness, and the electric ignition device is provided with an electric ignition head and an electric ignition wire 3;

[0048] Furthermore, the biomass fuel core includes liquid oxygen explosion paper, or is made of combustible raw materials such as straw powder, wood powder, and carbon powder.

[0049] Furthermore, the low temperature performance of the material of the cracking device requires that the material does not crack or deform in a low temperature environment of 180°C and has a certain strength.

[0050] Furthermore, the fracturing device has low thermal conductivity, good thermal insulation, and can be hot-melt processed.

[0051] Furthermore, the thickness of the tube body of the fracturing device is 3.5 to 6.0 mm, and the thickness of the tube cap structure is 7 to 10 mm.

[0052] Furthermore, the underwater liquid oxygen explosion fracturing device and its welding assembly include a fracturing device, an exhaust pipe 1, a liquid injection pipe 2, a biomass core, an electric ignition head, an electric ignition wire 3 and manufacturing tools. The number of electric ignition heads is not less than two in each fracturing device. The manufacturing tools include a pipe body welding machine, a plug-in welding machine for the pipe cap and the exhaust pipe 1, a hand drill, a planer, a through-hole shaping and a detection instrument.

[0053] The manufacturing process of underwater liquid oxygen explosion fracturing device, the specific method and steps are as follows:

[0054] S01. Prepare the pipes for the fracturing device. According to the design parameters of the gas explosion project, use round pipes of corresponding specifications and sizes;

[0055] S02, using a pipe cap with the same material as the pipe of the fracturing device, and an outer diameter and a wall thickness not less than the wall thickness of the pipe. Two pipe caps are required to assemble a set of fracturing devices, namely an upper pipe cap 7 and a lower pipe cap 6;

[0056] S03, making biomass string core and installing electric ignition device;

[0057] S04, assembling the pipe cap: use an electric drill to drill a circular hole with a diameter slightly smaller than the outer diameter of the exhaust pipe 1 at the eccentric position of the top cover of the upper pipe cap 7, i.e., the drill hole 8 of the upper pipe cap, and use a plug-in welding machine to plug-weld the exhaust pipe 1 and the drill hole 8 of the upper pipe cap, and weld the exhaust pipe and the pipe cap at the welding point 4. At the same time, use a through-hole shaping rod to insert the welding part from the exhaust pipe 1 port in the pipe cap and keep it in position, and cool it to form;

[0058] S05. Assemble the pipe body: The pipe cap welded with the exhaust pipe 1 and the pipe body of a certain length are respectively placed and fixed on the butt welding machine. First, the butt joint between the pipe cap and the pipe body is milled and flattened with a matching electric milling cutter. Then, a matching electric heating plate is placed on the butt joint to heat and melt. After removing the heating plate, a certain pressure is continuously applied with the butt welding machine to press and weld the pipe body and the pipe cap, and then cooled to form.

[0059] S06. Pipe threading and core loading: Use a threader to pass the injection tube 2 and ignition wire in the processed biomass string through the processed splitter body and exhaust pipe 1 from the inside to the outside, and slowly load the entire biomass string into the splitter tube body 5 by pushing and pulling forward and backward to form a semi-finished splitter. Do not force the biomass string into the splitter, do not change the shape and density of the biomass string, and do not damage the electric ignition device; and use the ohmmeter of the detection device to detect the integrity of the electric ignition device;

[0060] S07, closing the pipe body: the semi-finished product of the fracturing device and another pipe cap are respectively placed and fixed on the butt welding machine, firstly, the butt joint of the pipe cap and the semi-finished product of the fracturing device is milled and cut flat with a matching electric milling cutter, and then the matching electric heating plate is placed on the butt joint to heat and melt, and after removing the heating plate, a certain pressure is continuously applied with the butt welding machine to press and weld the semi-finished product of the fracturing device and the pipe cap, and the product is formed by cooling and forming, so as to form a finished product of the fracturing device;

[0061] S08, planing and forming: using a planer to plan the weld flange convex ring on the external pipe body of the fracturing device;

[0062] S09. Seal pipe ends: Use waterproof tape to make waterproof seals on the ends of exhaust pipe 1 and injection pipe 2 to prevent water, mud and debris from entering exhaust pipe 1 and injection pipe 2 during underwater operations, which may affect the normal function of the fracturing device.

[0063] S10, Exhaust pipe 1 coil binding: To facilitate transportation and on-site operations and prevent damage to the pipeline, the exhaust pipe 1 coil should be tied with tape;

[0064] S11. Marking numbers: After each set of liquid oxygen explosion fracturing device is completed, numbers are marked on the fracturing device body 5 and the end of the exhaust pipe 1, respectively, and the marking includes at least the row number, hole position and other information;

[0065] S12. The above process completes the manufacturing process of the underwater liquid oxygen explosion fracturing device.

[0066] Furthermore, in step S03, the method of making the biomass string core and installing the electric ignition device is as follows:

[0067] S031, using a hand drill to drill a row of injection holes (with a hole diameter of 3 to 5 mm) at intervals of 40 to 60 cm in the length of the injection tube 2 that is expected to be placed in the fracturing device tube body 5;

[0068] S032, connect the combustible biomass cores (or paper rolls) into a string using the injection tube 2, the length of which is adapted to the length of the cracker tube 5;

[0069] S033. Place the electric ignition heads at the 1 / 5 and 4 / 5 positions at the lower end of the pipe string. The electric ignition heads should be in close contact with the combustible biomass core;

[0070] S034, the electric ignition head foot wires are connected in parallel and then in series with the electric ignition wire 3, the connection points are wrapped with insulating tape and fixed to the biomass core with tape.

[0071] Furthermore, in step S06, when the fracturing device tube body 5 is welded, the welding of the tube body and the tube cap should be aligned and smooth without misalignment, the weld seam should be planed smoothly, and the outer diameter of the circumference of the weld seam should not be larger than the diameter of the fracturing device tube.

[0072] Furthermore, at the joint welding point between the exhaust pipe 1 and the pipe cap, the exhaust pipe 1 should not be blocked and the inner diameter should not be necked down.

[0073] Furthermore, during planing and welding operations, workers should wear gloves and pay attention to electrical safety to avoid burns and planing injuries.

[0074] 1. Basic requirements for underwater liquid oxygen explosion fracturing device materials

[0075] 1) Good low temperature performance. The material should not crack or deform in a low temperature environment of -180℃ and should have a certain strength. It is best to use raw materials such as high molecular polyethylene, high density polyethylene, nylon 12, etc., and no other materials should be added.

[0076] 2) Heat insulation and environmental protection. The fracturing device is required to have a low thermal conductivity and good thermal insulation, so as to minimize the heat exchange between liquid oxygen and surrounding water and other media during underwater liquid oxygen explosion operations, and reduce the heat absorption and vaporization loss of liquid oxygen.

[0077] 3) The material can be hot-melt processed, which is convenient for on-site assembly and molding. After the cracking device is processed, it has good air tightness and waterproof seal without cracking.

[0078] 4) The material source is wide, which is conducive to factory production, low cost and engineering application.

[0079] 5) Under the premise of ensuring the strength of the fracturing device and facilitating welding, the structural thickness of the fracturing device tube body 5 is minimized as much as possible. Under the premise of a certain diameter of the underwater blasthole, the effective volume of the fracturing device is increased, the useless work used to overcome the constraints of the fracturing device tube body 5 during liquid oxygen explosion is reduced, and the gas explosion efficiency is improved. After multiple verifications, the thickness of the underwater liquid oxygen explosion fracturing device tube body 5 is 3.5-6.0 mm, and the thickness of the tube cap structure is 7-10 mm.

[0080] 2. Precautions for assembling underwater liquid oxygen explosion fracturing device

[0081] 1) All welding parts must be firm and sealed, without water leakage, air leakage or cracking.

[0082] 2) The diameter and length of the fracturing device, the length of the exhaust pipe 1, the injection pipe 2, and the electric ignition wire 3 should be determined according to the design, but must meet the actual needs on site.

[0083] 3) After the ignition device is set up and the cracking device assembly is completed, special instruments should be used to check the circuit integrity and resistance value, and compared with the design. If any problems are found, they should be dealt with in a timely manner.

[0084] 4) The welding of the pipe body 5 of the fracturing device should be smooth and aligned with the pipe cap without misalignment. The weld cutting should be smooth, and the outer diameter of the weld circumference should not be larger than the diameter of the fracturing device.

[0085] 5) At the joint between the exhaust pipe 1 and the pipe cap, the exhaust pipe 1 should not be blocked and the inner diameter should not be reduced.

[0086] 6) During planing and welding operations, workers should wear gloves and pay attention to electrical safety to avoid burns and planing injuries.

[0087] The working principle of the underwater liquid oxygen explosion reef of the present invention is that when the underwater liquid oxygen explosion (or air energy expansion cracking) is a gas explosion operation, a special liquid oxygen explosion paper, or a biomass fuel core made of combustible raw materials such as straw powder, wood powder, and carbon powder in a certain proportion, is loaded into a cracker, and the cracker is also equipped with a liquid injection pipe 2, an exhaust pipe 1, and an electric ignition device. Then, the drilling is completed on the target underwater reef body according to the design, and the assembled cracker is pushed into a certain position of the blast hole and blocked. After the power is turned on and detonated, the ignition head in the blast hole cracker is instantly excited by the ignition head heat source, and the combustible material is quickly ignited, and the combustion range is rapidly expanded. At the same time, the surrounding liquid oxygen is quickly vaporized after being heated, and the volume expands sharply. A large quasi-static pressure can be formed in the blast hole instantly, so that the rock is cracked and moved, and the underwater blasting is completed. Compared with traditional explosive blasting, the underwater liquid oxygen explosion has low blasting vibration and underwater impact strength, and a small impact range.

[0088] The beneficial effects of the present invention are: the fracturing device including the fracturing device, the injection pipe 2, the exhaust pipe 1, the electric ignition device and the biomass fuel core, the underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic materials, the structure is simple and environmentally friendly, and the welding assembly process method has the following advantages:

[0089] 1. The present invention has a simple structure and high integration. From the outside, there are only four major components: the fracturing device housing, the upper and lower pipe caps 6, and the exhaust pipe 1. The biggest advantage is that the three pipelines of the traditional liquid oxygen explosion, the injection pipe 2, the exhaust pipe 1, and the electric ignition wire 3, are integrated together, and the injection pipe 2 and the electric ignition wire 3 are placed in the exhaust pipe 1.

[0090] 2. The present invention adopts hot-melt material as the main material of the fracturing device, which is convenient for flexible processing and assembly of various fracturing devices on site according to the actual project, and the hot-melt welding process equipment is relatively simple, the welding is firm, the air tightness is good, and the fracturing device is well formed.

[0091] 3. The present invention adopts hot-melt material as the main material of the fracturing device, which not only has good low-temperature resistance and high strength, but also has thermal insulation and electrical insulation. Under the premise of ensuring the safety of liquid oxygen explosion operation, it reduces the heat exchange between liquid oxygen and surrounding water bodies, rocks and other media, reduces the loss of liquid oxygen due to heat vaporization during operation, and improves the utilization rate of liquid oxygen.

[0092] 4. The present invention uses high-density, high-molecular polyethylene, nylon 12 and other materials as the main materials of the fracturing device, all of which are general materials with wide sources, safety and reliability, and low cost, which are convenient for large-scale liquid oxygen explosion engineering applications.

[0093] 5. The present invention follows the concept of green environmental protection in the whole process from materials to processing, from gas explosion operation to detonation. In the gas explosion process, only biomass is burned, liquid oxygen is vaporized, and the fracturing device is ruptured into fragments, which are then recycled and reused. No toxic or harmful substances are produced in the whole process.

[0094] 6. Exhaust pipe 1 coils are tied and numbered to facilitate transportation and on-site operations.

[0095] The above welding and assembly process has high gas explosion efficiency and strong operability under the application conditions of multiple underwater liquid oxygen explosion scenarios. The assembled fracturing device is safe and reliable, and the gas explosion effect is good. It is a simple, easy-to-use, reliable, efficient, and economical underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic material fracturing device welding and assembly process method. Compared with traditional explosive blasting, the underwater liquid oxygen explosion of the present invention has low blasting vibration and underwater impact strength, and a small impact range; the blasting has few toxic and harmful products, and has little harm to aquatic organisms. It is a green, environmentally friendly, efficient and safe underwater reef blasting construction technology.

[0096] The above description is only the preferred implementation mode of this patent and does not limit the scope of this patent. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings, directly or indirectly used in other related technical fields, falls within the scope of protection of this patent.

Claims

1. An underwater liquid oxygen explosion fracturing device, characterized in that: The invention comprises a fracturing device, a liquid injection pipe, an exhaust pipe, an electric ignition device and a biomass fuel core. The biofuel core is installed in the fracturing device. The material of the fracturing device is a polymer, high-density polyethylene or nylon 12 thermoplastic material. The fracturing device is provided with two or more pipe caps. The fracturing device has a waterproof seal and good air tightness. The electric ignition device is provided with an electric ignition head and an electric ignition wire.

2. The underwater liquid oxygen explosion fracturing device according to claim 1, characterized in that: The biomass fuel core is made of liquid oxygen explosion paper, or straw powder, wood powder, carbon powder and other combustible raw materials.

3. The underwater liquid oxygen explosion fracturing device according to claim 1, characterized in that: The material of the cracking device does not crack or deform in a low temperature environment of -180°C.

4. The underwater liquid oxygen explosion fracturing device according to claim 1, characterized in that: The material of the cracker has low thermal conductivity, good thermal insulation and can be processed by hot melting.

5. The underwater liquid oxygen explosion fracturing device according to claim 1, characterized in that: The thickness of the tube body of the fracturing device is 3.5-6.0 mm, and the thickness of the tube cap structure is 7-10 mm.

6. The manufacturing process of the underwater liquid oxygen explosion fracturing device according to claim 1 to claim 5, characterized in that: It includes a cracker, an exhaust pipe, a liquid injection pipe, a biomass core, an electric ignition head, an electric ignition wire and manufacturing tools. The number of the electric ignition heads in each cracker is not less than two. The manufacturing tools include a pipe body welding machine, a plug-in welding machine for pipe caps and exhaust pipes, a hand drill, a planer, through-hole shaping and testing instruments; The manufacturing process of the underwater liquid oxygen explosion fracturing device, the specific method and steps are as follows: S01. Prepare the pipes for the fracturing device. According to the design parameters of the gas explosion project, use round pipes of corresponding specifications and sizes; S02. Use a pipe cap with the same material as the pipe of the fracturing device, with an outer diameter and a wall thickness not less than the wall thickness of the pipe. Two pipe caps are required to assemble a set of fracturing devices, namely an upper pipe cap and a lower pipe cap; S03, making biomass string core and installing electric ignition device; S04, assembling the pipe cap: using an electric drill to drill a circular hole with a diameter slightly smaller than the outer diameter of the exhaust pipe at an eccentric position of the top cover of the upper pipe cap, using a plug-in welder to plug-weld the exhaust pipe to the circular hole of the pipe cap, and at the same time using a through-hole shaping rod to insert into the welding position from the exhaust pipe opening in the pipe cap and keep it in position, and cool to form; S05. Assemble the pipe body: Place the pipe cap welded with the exhaust pipe and a certain length of pipe body on the butt welding machine respectively. First, use the matching electric milling cutter to mill and flatten the joint between the pipe cap and the pipe body. Then, place the matching electric heating plate on the joint to heat and melt. After removing the heating plate, continue to apply a certain pressure with the butt welding machine to press and weld the pipe body and the pipe cap, and cool to form. S06. Pipe threading and core loading: Use a threader to pass the injection tube and electric ignition wire in the processed biomass string from the inside to the outside through the processed splitter body and exhaust pipe, and slowly load the entire biomass string into the splitter tube body by pushing and pulling forward and backward to form a semi-finished splitter. Do not force the biomass string into the pipe, do not change the shape and density of the biomass string, and do not damage the electric ignition device; and use the ohmmeter of the detection device to detect the integrity of the electric ignition device; S07, closing the pipe body: the semi-finished product of the fracturing device and another pipe cap are respectively placed and fixed on the butt welding machine, firstly, the butt joint of the pipe cap and the semi-finished product of the fracturing device is milled and cut flat with a matching electric milling cutter, and then the matching electric heating plate is placed on the butt joint to heat and melt, and after removing the heating plate, a certain pressure is continuously applied with the butt welding machine to press and weld the semi-finished product of the fracturing device and the pipe cap, and the product is formed by cooling and forming, so as to form a finished product of the fracturing device; S08, planing and forming: using a planer to plan the weld flange convex ring on the external pipe body of the fracturing device; S09. Seal pipe ends: Use waterproof tape to make waterproof seals on the ends of the exhaust pipe and injection pipe to prevent water, mud and debris from entering the exhaust pipe and injection pipe during underwater operations, which may affect the normal function of the fracturing device. S10. Exhaust pipe coil binding: To facilitate transportation and on-site operations and prevent pipeline damage, the exhaust pipe coil should be bound with tape; S11. Marking numbers: After each set of liquid oxygen explosion fracturing device is completed, numbers are marked on the pipe body and the end of the exhaust pipe of the fracturing device, and the marking includes at least the row number and hole position information; S12. The above completes the manufacturing and assembly process of the underwater liquid oxygen explosion fracturing device.

7. The manufacturing process of the underwater liquid oxygen explosion fracturing device according to claim 6, characterized in that: In step S03, the method of making the biomass string core and installing the electric ignition device is as follows: S031. Use a hand drill to drill a row of injection holes (with a hole diameter of 3 to 5 mm) at intervals of 40 to 60 cm in the length of the injection tube that is expected to be placed in the fracturing device tube body; S032, connecting the combustible biomass cores (or paper rolls) into a string using a liquid injection tube, the length of which is adapted to the length of the cracking device tube; S033, placing the electric ignition heads at the 1 / 5 and 4 / 5 positions at the lower end of the pipe string respectively, and the electric ignition heads should be in close contact with the combustible biomass core; S034. The electric ignition head foot wires are connected in parallel and then in series with the electric ignition lead wires. The connection points are wrapped with insulating tape and fixed to the biomass core with tape.

8. The manufacturing process of the underwater liquid oxygen explosion fracturing device according to claim 6, characterized in that: In the step S06, the welding of the pipe body of the fracturing device, the welding of the pipe body and the pipe cap should be aligned and smooth without misalignment, the weld seam should be smooth, and the outer diameter of the circumference of the weld seam should not be larger than the diameter of the fracturing device.

9. The manufacturing process of the underwater liquid oxygen explosion fracturing device according to claim 6, characterized in that: At the joint welding point between the exhaust pipe and the pipe cap, there should be no blockage in the exhaust pipe and the inner diameter should not be reduced.

10. The manufacturing process of the underwater liquid oxygen explosion fracturing device according to claim 6, characterized in that: During the planing and welding operations, operators should wear gloves, pay attention to electrical safety, and avoid burns and planing injuries.

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