Efficient and simple underwater liquid oxygen gas explosion fracturing device

Abstract

The utility model discloses an underwater liquid oxygen gas explosion induced fracturing device of high efficiency and simple and convenient belongs to underwater blasting technical field, including the fracturing device pipe body of the hot melt material, and the upper pipe cap and lower pipe cap of same material are hot melt welded with fracturing device pipe body two ends respectively, and the pipe wall of upper pipe cap is equipped with the opening, and the hole wall of opening is hot melt welded with the fracturing device exhaust pipe of same material. The fracturing device pipe body of the utility model adopts the hot melt material to make, not only low temperature performance is good, can ensure the effective volume in fracturing device pipe body, can also improve the security of blasting operation, all components adopt same material to make, and the body connecting mode of hot melt welding is used between all components, and welding is firm, and the integrity and the sealing property are good, and the fracturing device material basically has no toxicity, and the harmful effect to person and environment is all smaller, the fracturing device structure of the utility model is simple, and the material source is extensive, and is easy to process and make, and the cost is lower, and is favorable to the application of underwater gas explosion operation large -scale engineering.

Description

Technical Field

[0001] This utility model belongs to the field of underwater blasting technology, specifically a highly efficient and simple underwater liquid oxygen blasting device. Background Technology

[0002] Underwater blasting is an important component of engineering blasting. It is widely used in national economic construction and defense engineering, including port and dock construction, shipyard construction, waterway dredging, water conservancy and hydropower projects, and road and bridge construction. Underwater air-energy fracturing involves placing combustible materials such as rolled paper, straw powder, wood powder, and carbon powder, along with liquid oxygen in a specific ratio, into the fracturing device tube within the borehole. Upon energization, the combustible material near the igniter is instantly ignited by the heat from the electric igniter, rapidly expanding the combustion area. Simultaneously, the surrounding liquid oxygen vaporizes rapidly upon heating, expanding dramatically and instantly creating significant quasi-static pressure within the borehole, causing rock cracking and movement. Compared to traditional explosive blasting, underwater liquid oxygen blasting exhibits lower blasting vibration and underwater impact strength, a smaller impact range, and fewer toxic and harmful byproducts, posing less threat to aquatic life. It is a truly green and environmentally friendly blasting technology.

[0003] As the primary container for combustible materials and liquid oxygen, the fracturing device is a crucial component in liquid oxygen explosions, especially underwater liquid oxygen explosions, and is vital to operational safety and blast effectiveness. Due to the excellent mechanical properties and corrosion resistance of fiberglass, most existing fracturing devices utilize fiberglass tubing. However, fiberglass tubing is expensive, significantly increasing initial investment costs, especially for large-scale projects. Furthermore, the connections between fiberglass tubing primarily employ socket-type double O-ring seals or flat-mouth reaction elastic seals. Upon impact, these seals may break at the joints, affecting the blasting effect. Utility Model Content

[0004] The purpose of this invention is to address the problems of high cost of fiberglass tubes used in existing fracturing devices, and the fact that the connections between tubes are heterogeneous, which may break at the joints under impact, thus affecting the blasting effect. This invention proposes a highly efficient and simple underwater liquid oxygen blasting fracturing device. The fracturing device tubes are made of heat-fusible materials, and the connections between fracturing device tubes and between the fracturing device tubes and the upper and lower caps can be achieved by heat-fusion welding or heat-fusion butt welding, which are integral connections. The strength and elasticity at the joints are the same as the main body, preventing stress concentration and effectively improving the overall strength of the fracturing device.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a high-efficiency and simple underwater liquid oxygen explosion fracturing device, comprising a fracturing device tube made of a heat-fusible material, with an upper cap and a lower cap of the same material as the fracturing device tube welded to both ends of the fracturing device tube. An opening is provided on the wall of the upper cap, and a fracturing device vent pipe of the same material is heat-fusted to the wall of the opening. During assembly, an inlet pipe, an ignition wire, etc., can be inserted into the fracturing device vent pipe. The fracturing device vent pipe not only vents air but also protects the injection pipe and the ignition wire, isolates the injection pipe from direct contact with the water, reduces heat exchange between liquid oxygen and water, reduces vaporization loss of liquid oxygen during injection, and improves the effect of 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, not only has good low-temperature performance and does not crack in the low-temperature environment of liquid oxygen, but also has a certain strength to meet the strength requirements of the fracturing device tube.

[0007] Preferably, the ends of the upper and lower caps furthest from the fracturing device tube are rounded, which reduces the resistance between the fracturing device and the borehole wall, making it easier to place the fracturing device smoothly into the underwater borehole.

[0008] Preferably, the fracturing tube is extended by hot-melt butt welding according to the required length. When the length of one fracturing tube is insufficient, multiple fracturing tubes can be welded together by hot-melt butt welding to extend the length. Moreover, adjacent fracturing tubes are connected by hot-melt butt welding, which provides good waterproof sealing and ensures no water seepage or leakage. Hot-melt welding is also a type of body welding, resulting in a strong bond and good overall integrity.

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

[0010] Preferably, the outer diameters of the upper and lower caps are the same as the outer diameter of the fracturing tube body, and the wall thicknesses of the upper and lower caps are slightly greater than the wall thickness of the fracturing tube body. The preferred wall thicknesses of the upper and lower caps are 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 borehole plugging length, and horizontal distance between the borehole and the injection main pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model uses heat-fusible materials such as high molecular weight polyethylene or nylon 12 to make the fracturing tube body. These materials have good low-temperature performance, ensuring that the fracturing tube body will not crack in the low-temperature environment of liquid oxygen. They also have a certain strength, which can resist the external forces such as water pressure at a certain depth and blockages without deformation, ensuring the effective volume inside the fracturing tube body.

[0015] 2. The fracturing tube body, fracturing exhaust pipe, and upper and lower caps are made of the same material. Adjacent fracturing tube bodies, fracturing tube bodies and upper and lower caps, and upper caps and fracturing exhaust pipes are connected by hot-melt welding (butt welding, plug welding). This ensures good waterproof sealing, preventing water seepage and leakage. Hot-melt welding is also a body connection, resulting in a strong welded joint and good overall integrity.

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

[0017] 4. The fracturing tube made of high molecular weight polyethylene or nylon 12 has a low thermal conductivity, good thermal insulation effect, high effective utilization rate of liquid oxygen during gas explosion operation, and is not affected by environmental stray currents, etc., resulting in high safety of blasting operation.

[0018] 5. The fracturing device has a simple structure, widely available materials, is easy to process and manufacture, and has a low cost, which is conducive to large-scale engineering applications in underwater gas explosion operations. Attached Figure Description

[0019] Figure 1 This is an exploded schematic diagram of the components of the efficient and simple underwater liquid oxygen explosion fracturing device of this utility model.

[0020] Figure 2 This is a cross-sectional view of the connection of the efficient and simple underwater liquid oxygen explosion fracturing device of this utility model.

[0021] Legend:

[0022] 1-Fracturing device body; 2-Upper cap; 3-Opening; 4-Fracturing device exhaust pipe; 5-Lower cap. Detailed Implementation

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

[0024] Example 1

[0025] This embodiment provides a highly efficient and simple underwater liquid oxygen bursting device, such as... Figure 1 , Figure 2As shown, the device includes a fracturing tube 1 made of heat-fusible polyethylene. The fracturing tube 1 is cylindrical, and its outer diameter and wall thickness directly affect its volume and pressure-bearing capacity. According to the safety requirements for liquid oxygen blasting, the outer diameter of the fracturing tube 1 is 70 mm, and its wall thickness is 5 mm. In specific operating conditions, when the length of a single fracturing tube 1 is insufficient, multiple fracturing tubes 1 can be lengthened by hot-melt welding. Both ends of the fracturing tube 1 are hot-melt welded with upper caps 2 and lower caps 5 of the same material. To facilitate smooth placement of the fracturing device into the underwater borehole and reduce resistance between the fracturing device and the borehole wall, the lower cap 5 is rounded at the end. The outer diameters of both the upper cap 2 and the lower cap 5 are the same as the outer diameter of the fracturing tube 1, ensuring no jamming during placement. The wall thickness of both the upper cap 2 and the lower cap 5 is 8 mm. A hole 3 with a diameter of about 14 mm is drilled on the upper cap 2. A tube of the same material with a certain length (the specific length is determined according to factors such as water depth, underwater borehole plugging length, and horizontal distance between the borehole and the injection main pipe) and an outer diameter of about 18 mm is heat-fused and inserted into the hole wall of the hole 3 to form the fracturing device vent pipe 4. During the assembly operation, the fracturing device vent pipe 4 is used to install the liquid inlet pipe (connected to the injection main pipe for injecting liquid oxygen) and the ignition wire. In addition to the function of venting, the fracturing device vent pipe 4 also protects the injection pipe and the ignition wire, isolates the injection pipe from direct contact with the water, reduces heat exchange between liquid oxygen and water, reduces the vaporization loss of liquid oxygen during the injection process, and improves the liquid oxygen explosion effect.

[0026] Example 2

[0027] This embodiment provides a highly efficient and simple underwater liquid oxygen bursting device, such as... Figure 1 , Figure 2As shown, the device includes a fracturing tube 1 made of heat-fusible nylon 12. The fracturing tube 1 is cylindrical, and its outer diameter and wall thickness directly affect its volume and pressure-bearing capacity. According to the safety technical requirements for liquid oxygen blasting, the outer diameter of the fracturing tube 1 is 130 mm, and the wall thickness is 7 mm. The fracturing tube 1 has an upper cap 2 and a lower cap 5 of the same material welded to both ends. To facilitate the smooth placement of the fracturing device into the underwater borehole and reduce the resistance between the fracturing device and the borehole wall, the lower cap 5 is rounded at the end. The outer diameters of both the upper cap 2 and the lower cap 5 are the same as the outer diameter of the fracturing tube 1, ensuring no jamming during placement. The wall thickness of the upper cap 2 and the lower cap 5 is slightly greater than the wall thickness of the fracturing tube 1, typically around 12 mm. A hole 3 with a diameter of about 20 mm is drilled on the upper cap 2. A pipe of the same material with a certain length (the specific length is determined according to factors such as water depth, underwater borehole plugging length, and horizontal distance between the borehole and the injection main pipe) and an outer diameter of about 25 mm is heat-fused and inserted into the hole wall of the hole 3 to form the fracturing device vent pipe 4. During the assembly operation, the fracturing device vent pipe 4 is used to install the liquid inlet pipe (connected to the injection main pipe for injecting liquid oxygen) and the ignition wire. In addition to the function of venting, the fracturing device vent pipe 4 also has the functions of protecting the injection pipe and the ignition wire, isolating the injection pipe from direct contact with the water, reducing heat exchange between liquid oxygen and water, reducing the vaporization loss of liquid oxygen during the injection process, and improving the liquid oxygen explosion effect.

[0028] After being tested under various underwater liquid oxygen explosion scenarios, the fracturing devices of Embodiment 1 and Embodiment 2 of this utility model have the characteristics of good low-temperature performance, high strength, waterproof sealing, heat insulation, and environmental protection. Moreover, they have a simpler structure, are easier to process, are easier to mass-produce in factories, and have lower costs, making them easier to promote and use in the underwater liquid oxygen explosion industry.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of this utility model.

Claims

1. A highly efficient and simple underwater liquid oxygen explosion fracturing device, characterized in that: The fracturing device pipe body (1) is made of hot-melt material, and upper pipe caps (2) and lower pipe caps (5) made of the same material as the fracturing device pipe body (1) are hot-melt welded at both ends of the fracturing device pipe body (1), the pipe wall of the upper pipe cap (2) is provided with an opening (3), and the hole wall of the opening (3) is hot-melt welded with a fracturing device exhaust pipe (4) made of the same material.

2. The high efficient and simple underwater liquid oxygen gas explosion cracker according to claim 1, characterized in that: The hot-melt material is high-molecular polyethylene or nylon 12.

3. The high-efficiency simple underwater liquid oxygen gas explosion cracker according to claim 1 or 2, 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 high-efficiency simple underwater liquid oxygen gas explosion cracker according to claim 1 or 2, characterized in that: The fracturing device pipe bodies (1) are connected in a hot-melt butt joint mode.

5. The high efficient and simple underwater liquid oxygen gas explosion cracker according to claim 4, characterized in that: The fracturing device pipe body (1) is in a cylindrical shape, the outer diameter of the fracturing device pipe body (1) is 70-130 mm, and the wall thickness is 3-7 mm.

6. The high efficient and simple underwater liquid oxygen gas explosion cracker according to claim 5, characterized in that: The outer diameters of the upper pipe caps (2) and the lower pipe caps (5) are the same as the outer diameter of the fracturing device pipe body (1), and the wall thicknesses of the upper pipe caps (2) and the lower pipe caps (5) are slightly larger than the wall thickness of the fracturing device pipe body (1).

7. The high efficient and simple underwater liquid oxygen gas explosion cracker according to claim 6, characterized in that: The wall thicknesses of the upper pipe caps (2) and the lower pipe caps (5) are 8-12 mm.

8. The high efficient and simple underwater liquid oxygen gas explosion cracker according to claim 1, characterized in that: The diameter of the opening (3) is 14-24 mm.

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

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