An efficient and simple underwater liquid oxygen explosion fracturing device

Abstract

The invention discloses an efficient and convenient underwater liquid oxygen explosion fracturator, which belongs to the field of underwater blasting technology, and comprises a fracturator tube body made of a heat-meltable material, and an upper tube cap and a lower tube cap of the same material as the fracturator tube body are respectively heat-melted and welded at both ends of the fracturator tube body, and an opening is provided on the tube wall of the upper tube cap, and a fracturator exhaust pipe of the same material is heat-melted and welded at the hole wall of the opening. The fracturator tube body of the invention is made of heat-meltable material, which not only has good low-temperature performance, can ensure the effective volume in the fracturator tube body, but also can improve the safety of blasting operation; all parts are made of the same material, and the parts are connected by a hot-melt welding body, and the welding is firm, and the integrity and sealing are good; the material of the fracturator is basically non-toxic, and the harmful effects on people and the environment are relatively small; the fracturator of the invention has a simple structure, a wide range of material sources, is easy to process and manufacture, and has a low cost, which is conducive to the application of large-scale engineering of underwater gas explosion operations.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater blasting, and in particular is an efficient and simple underwater liquid oxygen explosion fracturing device. Background Art

[0002] 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 wharf construction, dock construction, channel dredging, water conservancy and hydropower, roads and bridges. Underwater air energy fracturing is a gas explosion operation. Combustible materials such as roll paper, straw powder, wood powder, carbon powder and liquid oxygen are placed in a certain proportion in the blast hole fracturing tube. After power is turned on, they are instantly excited by the heat source of the electric ignition head. The combustible materials near the electric ignition head are 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 rapidly. A large quasi-static pressure can be formed in the blast hole instantly, causing the rock to crack and move. Compared with traditional explosive blasting, underwater liquid oxygen blasting has low blasting vibration and underwater impact strength, and a small impact range; there are fewer toxic and harmful products in the blasting, and the harm to aquatic organisms is small. It is a truly green and environmentally friendly blasting construction technology.

[0003] As the main container of combustible materials and liquid oxygen, the fracturator 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. As FRP has excellent mechanical properties and excellent corrosion resistance, existing fracturators mostly use FRP pipe bodies, but the cost of FRP pipe bodies is relatively high, especially for large-scale projects, which will greatly increase the initial investment cost; the connection between FRP pipe bodies mainly adopts socket-type two-way "O" ring sealing connection or flat-end reaction elastic sealing ring connection. Once impacted, it may break first from the joint, thus affecting the blasting effect. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing fracturing device uses a glass fiber reinforced plastic pipe body with high cost, and the connection between the pipe bodies is a heterogeneous connection. Once impacted, it may break first at the interface, thereby affecting the blasting effect. An efficient and simple underwater liquid oxygen explosion fracturing device is proposed, wherein the fracturing device pipe body is made of hot-melt raw materials, and hot-melt welding or hot-melt butt welding can be adopted between the fracturing device pipe bodies and between the fracturing device pipe bodies and the upper and lower pipe caps, which are body connections. The strength and elasticity of the interface are the same as those of the body, and stress concentration will not be formed, thereby effectively improving the overall strength of the fracturing device.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: an efficient and simple underwater liquid oxygen explosion fracturator, comprising a fracturator tube body made of a heat-meltable material, an upper tube cap and a lower tube cap of the same material as the fracturator tube body are respectively heat-melted and welded at both ends of the fracturator tube body, an opening is provided on the tube wall of the upper tube cap, and a fracturator exhaust pipe of the same material is heat-melted and welded at the hole wall of the opening. During the assembly operation, a liquid inlet pipe, an ignition line, etc. can be inserted into the exhaust pipe of the fracturator. The exhaust pipe of the fracturator has the function of exhausting, protecting the injection pipe and the ignition line at the same time, isolating the direct contact between the injection pipe and the water body, reducing the heat exchange between the liquid oxygen and the water body, reducing the vaporization loss of the liquid oxygen heated during the injection operation, and improving the effect of the liquid oxygen explosion.

[0006] Preferably, the heat-fusible material is high molecular weight polyethylene or nylon 12. High molecular weight polyethylene or nylon 12 as the material for the fracturing device tube body not only has good low temperature performance and does not crack in a liquid oxygen low temperature environment, but also has a certain strength to meet the strength requirements of the fracturing device tube body.

[0007] Preferably, the ends of the upper pipe cap and the lower pipe cap away from the fracturing device tube body are rounded, which can reduce the resistance between the fracturing device and the hole wall and facilitate the smooth placement of the fracturing device in the underwater blasthole.

[0008] Preferably, the described fracturing device tube body is connected and lengthened by hot-melt butt welding according to the required length. When the length of one fracturing device tube body is insufficient, multiple fracturing device tube bodies can be welded and lengthened by hot-melt butt welding. Moreover, hot-melt pipe butt welding is adopted between adjacent fracturing device tube bodies, which has good waterproof sealing and ensures no water seepage and leakage. Hot-melt welding is also body welding, and the welding joint is firmly combined and has good integrity.

[0009] Preferably, the fracturing device tube body is cylindrical, with an outer diameter of 70 to 130 mm and a wall thickness of 3 to 7 mm.

[0010] Preferably, the outer diameters of the upper and lower tube caps are the same as that of the fracturing tube body, and the wall thicknesses of the upper and lower tube caps are slightly greater than that of the fracturing tube body, and the wall thicknesses of the upper and lower tube caps are preferably 8-12 mm.

[0011] Preferably, the diameter of the opening is 14 to 24 mm.

[0012] Preferably, the outer diameter of the fracturing device exhaust pipe is 15-25 mm, and the specific length of the fracturing device exhaust pipe can be determined according to factors such as water depth, underwater blasthole plugging length, and horizontal distance between the blasthole and the injection main pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention uses heat-fusible materials such as high molecular weight polyethylene or nylon 12 to make the fracturing device tube body. These materials have good low-temperature performance, ensuring that the fracturing device tube body does not crack in the low-temperature environment of liquid oxygen. In addition, they have a certain strength and can resist external forces such as water pressure at a certain depth and blockages without deformation, ensuring the effective volume inside the fracturing device tube body.

[0015] 2. The pipe body of the fracturing device, the exhaust pipe of the fracturing device, and the upper and lower pipe caps are made of the same material, and the adjacent pipe bodies of the fracturing device, the pipe body of the fracturing device and the upper and lower pipe caps, and the upper pipe cap and the exhaust pipe of the fracturing device are connected by hot-melt welding (butt welding, plug welding), which has good waterproof sealing performance, ensuring no water seepage and no liquid leakage. Hot-melt welding is also a body connection, and the welding part is firmly combined with good integrity;

[0016] 3. Polyethylene and nylon 12 are basically non-toxic, and the thickness of the fracturing tube is only a few millimeters. After the liquid oxygen explosion, the fracturing tube will not produce too many toxic and harmful substances, and the harm to people and the environment is relatively small;

[0017] 4. The thermal conductivity of the fracturing device tube made of high molecular polyethylene or nylon 12 is low, the thermal insulation effect is good, the effective utilization rate of liquid oxygen is high during gas explosion operation, and it is not affected by environmental stray current, etc., and the blasting operation is highly safe;

[0018] 5. The fracturing device has a simple structure, a wide range of material sources, is easy to process and manufacture, and has a low cost, which is conducive to large-scale engineering applications in underwater gas explosion operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded schematic diagram of the components of the efficient and simple underwater liquid oxygen explosion fracturing device of the present invention.

[0020] Figure 2 It is a connection cross-sectional view of the efficient and convenient underwater liquid oxygen explosion fracturing device of the present invention.

[0021] Legend:

[0022] 1-fracturer tube body; 2-upper tube cap; 3-opening; 4-fracturer exhaust pipe; 5-lower tube cap. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment 1

[0025] This embodiment provides an efficient and simple underwater liquid oxygen explosion fracturing device, such as Figure 1 , Figure 2As shown, the fracturing device comprises a pipe body 1 made of a heat-meltable material, high molecular polyethylene. The fracturing device pipe body 1 is cylindrical. The outer diameter and wall thickness of the fracturing device pipe body 1 directly affect its volume and pressure bearing capacity. According to the safety technical requirements of liquid oxygen explosion, the outer diameter of the fracturing device pipe body 1 is 70 mm and the wall thickness is 5 mm. Under specific use conditions, when the length of a fracturing device pipe body 1 is insufficient, multiple fracturing device pipe bodies 1 can also be heat-melted and welded by heat-melting butt welding to lengthen them. An upper pipe cap 2 and a lower pipe cap 5 of the same material are heat-melted and welded at both ends of the fracturing device pipe body 1. In order to facilitate the smooth placement of the fracturing device in the underwater blasthole and reduce the resistance between the fracturing device and the hole wall, the end of the lower pipe cap 5 is made into a round head shape, and the outer diameters of the upper pipe cap 2 and the lower pipe cap 5 are the same as the outer diameter of the fracturing device pipe body 1 to ensure that the lowering process is not stuck. The wall thickness of the upper pipe cap 2 and the lower pipe cap 5 is 8 mm. An opening 3 with a diameter of about 14 mm is drilled on the upper pipe cap 2, and a pipe of the same material with an outer diameter of about 18 mm and a certain length (the specific length is determined according to factors such as water depth, underwater blasthole blocking length, horizontal distance between blasthole and injection main pipe, etc.) is hot-melted and plugged into the hole wall of the opening 3 to form a fracturing device exhaust pipe 4. During the assembly operation, the fracturing device exhaust pipe 4 is used to penetrate a liquid inlet pipe (connected to the injection main pipe for injecting liquid oxygen) and an ignition line, etc. In addition to having the exhaust function, the fracturing device exhaust pipe 4 also has the functions of protecting the injection pipe and the ignition line, isolating the direct contact between the injection pipe and the water body, reducing the heat exchange between liquid oxygen and the water body, reducing the vaporization loss of liquid oxygen during the injection process, and improving the liquid oxygen explosion effect.

[0026] Embodiment 2

[0027] This embodiment provides an efficient and simple underwater liquid oxygen explosion fracturing device, such as Figure 1 , Figure 2As shown, the fracturing device comprises a tube body 1 made of a heat-meltable material nylon 12. The tube body 1 of the fracturing device is cylindrical. The outer diameter and wall thickness of the tube body 1 directly affect its volume and pressure bearing capacity. According to the safety technical requirements of liquid oxygen explosion, the outer diameter of the tube body 1 of the fracturing device is 130 mm and the wall thickness is 7 mm. The upper tube cap 2 and the lower tube cap 5 of the same material are heat-melted and welded at both ends of the tube body 1. In order to facilitate the smooth placement of the fracturing device in the underwater blast hole and reduce the resistance between the fracturing device and the hole wall, the end of the lower tube cap 5 is made into a round head shape, and the outer diameters of the upper tube cap 2 and the lower tube cap 5 are the same as the outer diameter of the fracturing device tube body 1 to ensure that the lowering process is not stuck. The wall thickness of the upper tube cap 2 and the lower tube cap 5 is slightly larger than the wall thickness of the fracturing device tube body 1, usually 12 mm. An opening 3 with a diameter of about 20 mm is drilled on the upper pipe cap 2, and a pipe of the same material with an outer diameter of about 25 mm and a certain length (the specific length is determined according to factors such as water depth, underwater blasthole blocking length, horizontal distance between blasthole and injection main pipe, etc.) is hot-melted and plugged into the hole wall of the opening 3 to form a fracturing device exhaust pipe 4. During the assembly operation, the fracturing device exhaust pipe 4 is used to penetrate a liquid inlet pipe (connected to the injection main pipe for injecting liquid oxygen) and an ignition line, etc. In addition to having the exhaust function, the fracturing device exhaust pipe 4 also has the functions of protecting the injection pipe and the ignition line, isolating the direct contact between the injection pipe and the water body, reducing the heat exchange between liquid oxygen and the water body, reducing the vaporization loss of liquid oxygen during the injection process, and improving the explosion effect of liquid oxygen.

[0028] After trial use in a variety of underwater liquid oxygen explosion scenarios, the fracturing devices of Embodiment 1 and Embodiment 2 of the present invention have the characteristics of good low-temperature performance, high strength, waterproof sealing, heat insulation, and green environmental protection. In addition, the structure is simpler, easier to process, convenient for factory production, and lower in cost, and easy to promote and use in the underwater liquid oxygen explosion industry.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents, and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. An efficient and simple underwater liquid oxygen explosion fracturing device, characterized by: The invention comprises a fracturing device tube body (1) made of a heat-meltable material, an upper tube cap (2) and a lower tube cap (5) made of the same material as the fracturing device tube body (1) are respectively heat-melted and welded at both ends of the fracturing device tube body (1), an opening (3) is provided on the tube wall of the upper tube cap (2), and a fracturing device exhaust pipe (4) made of the same material as the fracturing device tube body (1) is heat-melted and welded at the hole wall of the opening (3).

2. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 1 is characterized in that: The heat-fusible material is high molecular weight polyethylene or nylon 12.

3. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 1 or 2 is characterized in that: The end of the lower pipe cap (5) away from the fracturing device pipe body (1) is in a round head shape.

4. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 1 or 2 is characterized in that: The fracturing device tube bodies (1) are connected by hot-melt butt welding.

5. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 4 is characterized in that: The fracturing device tube body (1) is cylindrical, with an outer diameter of 70 to 130 mm and a wall thickness of 3 to 7 mm.

6. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 5 is characterized by: The outer diameters of the upper pipe cap (2) and the lower pipe cap (5) are the same as the outer diameter of the fracturing device pipe body (1), and the wall thicknesses of the upper pipe cap (2) and the lower pipe cap (5) are slightly greater than the wall thickness of the fracturing device pipe body (1).

7. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 6 is characterized by: The wall thickness of the upper tube cap (2) and the lower tube cap (5) are both 8 to 12 mm.

8. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 1 is characterized by: The diameter of the opening (3) is 14 to 24 mm.

9. The efficient and simple underwater liquid oxygen explosion fracturing device according to claim 8 is characterized in that: The outer diameter of the fracturing device exhaust pipe (4) is 15 to 25 mm.

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