Underwater liquid oxygen gas explosion fracturing device

Abstract

The utility model provides a kind of underwater liquid oxygen gas explosion fracturer, including fracturer, liquid injection pipe, exhaust pipe, electric ignition device and biomass fuel core body, fracturer is equipped with biomass fuel core body, the material of fracturer is high molecule, high density polyethylene and nylon 12 thermoplastic material, fracturer is equipped with two and above pipe cap, fracturer has waterproof seal, electric ignition device is equipped with electric ignition head and electric ignition lead, fracturer structure uses two pipe caps, wherein pipe cap and liquid injection hole correspond with fracturer, operability is extremely strong, the fracturer of welding seal assembly completion is safe and reliable, it is a kind of simple and easy to use, reliable and efficient, economic and applicable underwater liquid oxygen gas explosion fracturer.

Description

Technical Field

[0001] This utility model relates to the technical field of underwater liquid oxygen explosion equipment, and in particular to an underwater liquid oxygen explosion fracturing device. Background Technology

[0002] With the widespread application of engineering technology, underwater blasting is an important component of engineering blasting. In national economic construction and national defense engineering construction, underwater blasting is widely used in port and dock construction, shipyard construction, waterway dredging, water conservancy and hydropower, road and bridge construction, underwater pipeline laying and other engineering construction fields. However, the current fracturing device material structure is complex, especially the welding assembly structure is troublesome to operate, the structure is unreasonable, and the waterproof sealing effect is not good, which makes it difficult to waterproof and blast the fracturing device.

[0003] As the primary container for flammable 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. Among fracturing devices made of thermoplastic materials such as high-molecular-weight polyethylene and nylon 12, compared to those made of fiberglass, not only possess the same advantages as those made of fiberglass—good low-temperature performance, high strength, waterproof sealing, thermal insulation, and environmental friendliness—but also have a simpler structure, are easier to process, facilitate factory production, and are less expensive. However, fracturing devices made of thermoplastic materials such as high-molecular-weight polyethylene and nylon 12 require advanced assembly techniques, have complex structures, and require numerous tools and equipment. Slight carelessness can easily lead to water leakage, air leakage, or even cracking at the joints of the fracturing device, resulting in poor waterproof sealing and causing significant difficulties for underwater liquid oxygen explosions, seriously affecting the effectiveness, progress, and operational safety. Utility Model Content

[0004] This utility model provides an underwater liquid oxygen explosion fracturing device, which uses underwater liquid oxygen explosion polyethylene, nylon 12 and other thermoplastic materials. The fracturing device structure adopts two tube caps, in which the tube caps and the liquid injection hole correspond to the fracturing device, which is highly operable. The fracturing device assembled by welding and sealing is safe and reliable, with good gas explosion effect and high gas explosion operation efficiency. It is a simple, easy-to-use, reliable, efficient and economical underwater liquid oxygen explosion fracturing device.

[0005] To address the aforementioned problems, this utility model provides an underwater liquid oxygen explosion fracturing device, comprising a fracturing device, a liquid injection pipe, an exhaust pipe, an electric ignition device, and a biomass fuel core. The fracturing device contains the biomass fuel core and is equipped with two or more caps. The fracturing device is waterproof and airtight, and the electric ignition device is equipped with an electric ignition head and an electric ignition wire.

[0006] A further embodiment is that the material of the fracturing device is a polymer, high-density polyethylene, or nylon 12 thermoplastic material.

[0007] A further embodiment is that the biomass fuel core is made from liquid oxygen-blown paper or combustible raw materials such as straw powder, wood powder, and carbon powder.

[0008] A further embodiment is that the installation parts corresponding to the injection tube and the fracturing device tube body are respectively provided with a row of injection holes with a diameter of 3-5mm at intervals of 40-60cm.

[0009] A further embodiment 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 embodiment is that the top cap of the underwater liquid oxygen explosion fracturing device has a circular hole at an eccentric position, the diameter of which is slightly smaller than the outer diameter of the exhaust pipe.

[0011] A further solution is to use waterproof tape at the ends of the exhaust pipe and the injection pipe for waterproof sealing.

[0012] A further embodiment is that the outer tube of the fracturing device is provided with a weld flange protrusion ring for edge planing welding.

[0013] A further proposed solution is to mill the joint between the tube body and the cap of the fracturing device, and then weld them together to ensure a smooth and aligned finish.

[0014] A further embodiment is that the number of electric ignition heads is no less than two electric ignition heads in each fracturing device.

[0015] The beneficial effects of this utility model are as follows: The fracturing device, comprising a fracturing device, injection pipe, exhaust pipe, electric ignition device, and biomass fuel core, uses underwater liquid oxygen explosive fracturing materials such as polyethylene and nylon 12. The fracturing device structure is simple and environmentally friendly. It employs two caps, with the caps corresponding to the injection holes and the fracturing device itself, resulting in excellent operability. The welded and sealed assembly of the fracturing device ensures safety and reliability, good gas explosion effect, and high gas explosion operation efficiency. It is a simple, easy-to-use, reliable, efficient, and economical underwater liquid oxygen explosive fracturing device with the following advantages:

[0016] 1. This utility model has a simple structure and high integration. From the outside, it consists of only four main components: the fracturing device shell, the upper and lower caps, and the exhaust pipe. Its biggest advantage is that it integrates the three pipelines of traditional liquid oxygen explosion—the injection pipe, the exhaust pipe, and the ignition wire—into one, placing the injection pipe and the ignition wire inside the exhaust pipe.

[0017] 2. This utility model uses hot-melt materials as the main material of the fracturing device, which facilitates flexible on-site processing and assembly of various fracturing devices according to the actual engineering situation. In addition, the hot-melt welding process and equipment are relatively simple, the welding is firm, the airtightness is good, and the fracturing device is well formed.

[0018] 3. This utility model uses a thermoplastic material as the main material of the fracturing device. It not only has good low-temperature performance and high strength, but also provides thermal insulation. Under the premise of ensuring the safety of liquid oxygen explosion operation, it reduces the heat exchange between liquid oxygen and surrounding water, rocks and other media, reduces the loss of liquid oxygen due to heat vaporization during the liquid oxygen operation, and improves the utilization rate of liquid oxygen. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly structure of the fracturing tube body according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the exploded structure of the fracturing tube body according to an embodiment of the present invention.

[0021] Figure Labels

[0022] 1. Exhaust pipe; 2. Injection pipe; 3. Electric ignition wire; 4. Welding joint between exhaust pipe and pipe cap; 5. Fracturing device body; 6. Lower pipe cap; 7. Upper pipe cap; 8. Round hole. Detailed Implementation

[0023] To better understand the technical content of this utility model, the technical solution of this utility model will be further introduced and explained below with reference to the accompanying drawings and specific embodiments, but it is not limited thereto.

[0024] like Figure 1 and Figure 2 As shown in the specific embodiment of this utility model, an underwater liquid oxygen explosion fracturing device includes a fracturing device, a liquid injection pipe 2, an exhaust pipe 1, an electric ignition device, and a biomass fuel core. The fracturing device contains a biomass fuel core and is equipped with two or more pipe caps. The fracturing device is waterproof and sealed. The electric ignition device is equipped with an electric ignition head and an electric ignition wire 3.

[0025] Furthermore, the material of the fracturing device is high-molecular-weight, high-density polyethylene or nylon 12 thermoplastic material.

[0026] Furthermore, the biomass fuel core is made from liquid oxygen-filled blotting paper, or from combustible raw materials such as straw powder, wood powder, or carbon powder.

[0027] Furthermore, the corresponding installation parts of the injection pipe 2 and the fracturing device pipe body 5 are each provided with a row of injection holes with a diameter of 3 to 5 mm at intervals of 40 to 60 cm.

[0028] Furthermore, the thickness of the tube body of the fracturing device is 3.5–6.0 mm, and the thickness of the cap structure is 7–10 mm.

[0029] Furthermore, the top cap 7 of the underwater liquid oxygen explosion fracturing device has a round hole 8 at an eccentric position, the diameter of which is slightly smaller than the outer diameter of the exhaust pipe 1.

[0030] Furthermore, waterproof tape is used at the ends of the exhaust pipe 1 and the injection pipe 2 for waterproof sealing.

[0031] Furthermore, the outer tube of the fracturing device is provided with a weld flange protrusion ring for edge planing welding.

[0032] Furthermore, the joint between the tube body and the cap of the fracturing device is milled, aligned, and then welded.

[0033] Furthermore, the number of electric ignition heads is no less than two in each fracturing device. Furthermore, the welding and assembly process of the underwater liquid oxygen explosion fracturing device, specifically the following steps:

[0034] S01. Prepare the fracturing device tubing. Based on the design parameters of the gas explosion project, use round tubing of the appropriate specifications and dimensions.

[0035] S02. Use a cap made of the same material as the fracturing tube, with an outer diameter and wall thickness not less than the tube wall thickness. Two caps are required to assemble a set of fracturing tubes, namely the upper cap 7 and the lower cap 6.

[0036] S03. Fabricate a biomass core and install an electric ignition device;

[0037] S04. Assemble the cap: Drill a round hole 8 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 cap 7. Use a plug welding machine to plug and weld the exhaust pipe 1 to the round hole 8 of the cap. At the same time, use a through-hole shaping rod to insert into the welding part from the exhaust pipe 1 opening inside the cap and keep it in position. Cool and solidify.

[0038] S06. Assemble the pipe body: Place the cap with the exhaust pipe 1 and the pipe body of a certain length on the butt welding machine respectively. First, use the matching electric milling cutter to mill the joint between the cap and the pipe body flat. Then, use the matching electric heating plate to heat and melt the joint. After removing the heating plate, use the butt welding machine to continuously apply a certain pressure to press the pipe body and the cap together and weld them together. Let it cool and solidify.

[0039] S05. Pipe Insertion and Core Loading: Using a wire threader, thread the liquid injection tube 2 and electric ignition wire 3 from the inside out through the processed fracturing device body and exhaust pipe 1. By pushing and pulling back and forth, slowly load the entire biomass string into the fracturing device tube body 5 to form a semi-finished fracturing device. Do not force the biomass string into the device, do not change its shape or density, and do not damage the electric ignition device. Use an ohmmeter from the testing device to check the condition of the electric ignition device.

[0040] S07. Sealing the tube body: Place the semi-finished fracturing device and another tube cap on the butt welding machine respectively. First, use the matching electric milling cutter to mill the joint between the tube cap and the semi-finished fracturing device flat. Then, place the matching electric heating plate at the joint to heat and melt it. After removing the heating plate, use the butt welding machine to continuously apply a certain pressure to press and weld the semi-finished fracturing device and the tube cap together. After cooling and forming, the finished fracturing device is formed.

[0041] S08. Edge planing: Use an edge planer to plan the edge of the weld flange on the outer tube of the fracturing device.

[0042] S09. Sealing the pipe ends: Use waterproof tape to seal the ends of the exhaust pipe 1 and the injection pipe 2 to prevent water, mud and debris from entering the exhaust pipe 1 and the injection pipe 2 during underwater operations, which would affect the normal function of the fracturing device.

[0043] S10. Exhaust pipe coil 1 binding: To facilitate handling and on-site operations and to prevent damage to the pipeline, exhaust pipe coil 1 should be bound together with tape.

[0044] S11. Marking Numbers: After the overall completion of each group of liquid oxygen explosion fracturing devices, mark the numbers at the ends of the fracturing device tube 5 and the exhaust pipe 1, respectively. The markings should include at least the row number and hole position.

[0045] S12. The above completes the welding and assembly process of the underwater liquid oxygen explosion fracturing device.

[0046] Furthermore, in step S03, the method for fabricating the biomass core and installing the electric ignition device is as follows:

[0047] S031. Use an electric drill to drill a row of injection holes (3-5 mm in diameter) at intervals of about 40-60 cm along the length of the injection tube 2 that is expected to be placed inside the fracturing device tube 5.

[0048] S032. Connect the combustible biomass core (or roll paper) in series using the injection tube 2, with the length matching the length of the fracturing tube 5.

[0049] S033. Place the electric ignition head at the lower 1 / 5 and 4 / 5 positions of the tube string respectively, and the electric ignition head should be in close contact with the combustible biomass core.

[0050] S034. The electric ignition head wires are connected in parallel and then connected in series with the electric ignition wire 3. The connection point is wrapped with insulating tape and fixed to the biomass core with tape.

[0051] Furthermore, at the weld joint between the exhaust pipe 1 and the pipe cap, the exhaust pipe 1 should not be blocked, and its inner diameter should not be reduced.

[0052] Furthermore, during planing and welding operations, workers should wear gloves, pay attention to electrical safety, and avoid burns and planing injuries.

[0053] 1. While ensuring the strength of the fracturing device and facilitating welding, the structural thickness of the fracturing device tube 5 should be minimized. Given a fixed underwater borehole diameter, the effective volume of the fracturing device should be increased to reduce the wasted effort required to overcome the constraints of the fracturing device tube 5 during liquid oxygen explosion, thereby improving the explosion efficiency. Multiple verifications have shown that the thickness of the underwater liquid oxygen explosion fracturing device tube 5 is 3.5–6.0 mm, and the thickness of the cap structure is 7–10 mm.

[0054] II. Precautions for assembling underwater liquid oxygen fracturing devices

[0055] 1) All welded parts must be firm and sealed, and must not leak water or air or crack.

[0056] 2) The diameter and length of the fracturing device, and the lengths of the exhaust pipe 1, the liquid injection pipe 2, and the electric ignition wire 3 should be determined according to the design, but must meet the actual needs on site.

[0057] 3) After the ignition device is installed and the fracturing device assembly is completed, a special instrument should be used to check the integrity of the circuit and the resistance value, and compare it with the design. Any problems found should be dealt with in a timely manner.

[0058] 4) Welding of the fracturing tube body 5: The welding of the tube body and the tube cap should be aligned and smooth, without any misalignment. The weld seam should be smoothly cut, and the outer diameter of the weld seam should not be greater than the diameter of the fracturing tube.

[0059] 5) At the weld joint between exhaust pipe 1 and the pipe cap, the exhaust pipe 1 should not be blocked, and its inner diameter should not be reduced.

[0060] 6) When performing planing and welding operations, workers should wear gloves, pay attention to electrical safety, and avoid burns and planing injuries.

[0061] The working principle of this underwater liquid oxygen explosion reef is as follows: Underwater liquid oxygen explosion (or air-energy expansion fracturing) involves loading a fracturing device with specially made liquid oxygen explosion paper, or a biomass fuel core made from combustible materials such as straw powder, wood powder, and carbon powder in a certain proportion. The fracturing device is also equipped with an injection pipe 2, an exhaust pipe 1, and an electric ignition device. A hole is drilled in the target underwater reef according to the design, and the assembled fracturing device is pushed into the borehole at a certain position and plugged. After ignition, the combustible material near the ignition head in the fracturing device is rapidly ignited by the instantaneous heat source of the ignition head, and the combustion range rapidly expands. Simultaneously, the surrounding liquid oxygen vaporizes rapidly upon heating, expanding dramatically in volume and instantly creating a large quasi-static pressure within the borehole, causing the rock to crack and move, thus completing the underwater blast. Compared with traditional explosive blasting, this underwater liquid oxygen explosion has lower blasting vibration and underwater impact strength, and a smaller impact range.

[0062] The beneficial effects of this utility model are as follows: The fracturing device, comprising a fracturing device, an injection pipe 2, an exhaust pipe 1, an electric ignition device, and a biomass fuel core, uses underwater liquid oxygen to blast thermoplastic materials such as polyethylene and nylon 12. The fracturing device structure is simple and environmentally friendly. It employs two caps, with the caps corresponding to the injection holes and the fracturing device itself, resulting in excellent operability. The welded and sealed assembly of the fracturing device ensures safety and reliability, good gas blasting effect, and high gas blasting operation efficiency. It is a simple, easy-to-use, reliable, efficient, and economical underwater liquid oxygen blasting fracturing device with the following advantages:

[0063] 1. This utility model has a simple structure and high integration. From the outside, it consists of only four main components: the fracturing device shell, the upper and lower caps 6, and the exhaust pipe 1. Its biggest advantage is that it integrates the three pipelines of traditional liquid oxygen explosion—the injection pipe 2, the exhaust pipe 1, and the electric ignition wire 3—into one, placing the injection pipe 2 and the electric ignition wire 3 inside the exhaust pipe 1.

[0064] 2. This utility model uses hot-melt materials as the main material of the fracturing device, which facilitates flexible on-site processing and assembly of various fracturing devices according to the actual engineering situation. In addition, the hot-melt welding process and equipment are relatively simple, the welding is firm, the airtightness is good, and the fracturing device is well formed.

[0065] 3. This utility model uses a thermoplastic material as the main material of the fracturing device. It not only has good low-temperature performance and high strength, but also provides thermal insulation. Under the premise of ensuring the safety of liquid oxygen explosion operation, it reduces the heat exchange between liquid oxygen and surrounding water, rocks and other media, reduces the loss of liquid oxygen due to heat vaporization during the liquid oxygen operation, and improves the utilization rate of liquid oxygen.

[0066] Compared with traditional explosive blasting, this utility model of underwater liquid oxygen detonator has lower blasting vibration and underwater impact intensity, and a smaller impact range; it produces fewer toxic and harmful blasting products and has less harm to aquatic organisms. It is a green, environmentally friendly, efficient and safe underwater liquid oxygen detonator.

[0067] The above description is only a preferred embodiment of this patent and does not limit the scope of this patent. Any equivalent structural or procedural transformations made using the description and drawings, whether directly or indirectly applied to other related technical fields, shall fall within the scope of protection of this patent.

Claims

1. An underwater liquid oxygen gas explosion fracturing device, characterized in that, The underwater liquid oxygen gas explosion rupturing device comprises a rupturing device, a liquid injection pipe, an exhaust pipe, an electric ignition device and a biomass fuel core, the rupturing device is internally provided with the biomass fuel core, the rupturing device is provided with two or more pipe caps, the rupturing device has waterproof sealing, and the electric ignition device is provided with an electric ignition head and an electric ignition wire.

2. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The material of the rupturing device is high-molecular, high-density polyethylene or nylon 12 thermoplastic material.

3. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The biomass fuel core comprises liquid oxygen gas explosion scroll paper or combustible material raw materials such as straw powder, wood powder and carbon powder.

4. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The liquid injection pipe is provided with a row of liquid injection holes with a diameter of 3-5 mm at an interval of 40-60 cm.

5. The underwater liquid oxygen gas explosion cracker as claimed in claim 1, wherein, The thickness of the pipe body of the rupturing device is 3.5-6.0 mm, and the thickness of the pipe cap structure is 7-10 mm.

6. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, An eccentric position of the upper pipe cap top cover of the underwater liquid oxygen gas explosion rupturing device is provided with a round hole with a diameter slightly smaller than the outer diameter of the exhaust pipe.

7. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The end of the exhaust pipe and the liquid injection pipe is provided with waterproof adhesive tape for waterproof sealing treatment.

8. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The pipe body outside the rupturing device is provided with a weld flange convex ring for edge planing and welding.

9. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The pipe body and the pipe cap of the rupturing device are milled, flattened and aligned, and then welded.

10. The underwater liquid oxygen gas explosion cracker of claim 1, wherein, The number of the electric ignition head is not less than two in each rupturing device.

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