Expansion fracturing device based on liquid oxygen energy

Abstract

The utility model discloses an expansion fracturing device based on liquid oxygen energy, which comprises a plurality of fracturing single pipes capable of being connected in series and spliced, each fracturing single pipe comprises a sleeve and a fracturing assembly arranged in the sleeve, each fracturing assembly comprises a liquid filling pipe I, and at least one liquid conveying hole is formed in the liquid filling pipe I along the axial direction; connecting pipe fittings are arranged at the two ends of the sleeve correspondingly, liquid filling passages communicating with first liquid filling pipes in the fracturing assemblies are arranged in the connecting pipe fittings, and exhaust passages used for exhausting gas in the sleeve are further arranged in the connecting pipe fittings. After the two adjacent fracturing single pipes are connected in series, the inner cavities of the sleeves of the two adjacent fracturing single pipes are communicated through the exhaust passage of the connecting pipe fitting, and the first liquid filling pipes of the two adjacent fracturing single pipes are communicated through the liquid filling passage on the connecting pipe fitting. And the fracturing single pipe is filled with liquid oxygen into the sleeve through the liquid filling pipe. Through the arrangement of the technical scheme, expansion fracturing devices with different lengths can be freely assembled, and the single fracturing pipes with the same length are more convenient to package and transport.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion fracturing, in particular to an expansion fracturing device based on liquid oxygen energy. Background Art

[0002] In mining, geological exploration, subways, tunnels, municipal engineering, underwater engineering, and emergency rescue, gas blasting technology is used. Holes are drilled in places where there are rocks through a rock drill, and finally the fracturing tube equipment is placed in the rock mass that needs to be blasted, so that the liquid or solid material filled in the fracturing tube expands to produce high-pressure gas. The huge pressure generated is used to crush the rock, so that the hard rock is divided into fragments. This fracturing equipment has the characteristics of simple production, safety, environmental protection, and low cost.

[0003] A portable gas expansion rock breaking device was disclosed in a Chinese patent document on May 30, 2023, with the publication number CN219890293U. The gas expansion rock breaking device in this scheme includes an anti-static PVC plastic tube, with an upper sealing cover and a lower sealing cover at both ends of the anti-static PVC plastic tube, and the upper sealing cover is provided with a female connector of a quick-connect connector, which passes through the upper sealing cover and is connected to the liquid inlet pipe in the anti-static PVC plastic tube. The female connector is used in conjunction with the male connector provided in the liquid oxygen supply equipment. A pressure relief valve and an ignition fuse are also provided on the upper sealing cover, and the ignition fuse passes through the upper sealing cover and extends to the inside of the anti-static PVC plastic tube. The device has the characteristics of instant charging and breaking, easy transportation and storage, and high safety in on-site operation.

[0004] In the prior art "CN108278937A one-time expansion tube for fracturing and its fracturing method", the expansion tube has a simple structure, with a first plug and a second plug provided at both ends of the outer shell, a gas generator, a gas generator and a trigger device provided inside the outer shell, and wires passing through both ends of the gas generator connected to both ends of the trigger device; in "CN117450860A a fracturing tube", oxygen is filled into the closed membrane cavity to assist combustion of the combustion core, thereby heating the liquid nitrogen or liquid carbon dioxide outside the closed membrane cavity, causing a phase change to cause the fracturing tube to explode.

[0005] However, during the preparation of the current fracturing tubes, the length of the fracturing tubes is fixed, and the usual specifications include aluminum tubes with a length ranging from 5m to 15m according to the common drilling depth. However, during rock and soil fracturing in urban construction, open-pit mining, mine excavation, etc., it is necessary to drill holes with a down-the-hole drill or a hydraulic rock drill according to the on-site conditions, and consider the model (i.e., classification according to kilograms), diameter, length of the disposable gas-filled fracturing device, the hole depth and hole diameter are suitable for the kilograms of the fracturing device. The integral fracturing tubes of different lengths are suitable for fixed hole depths, and it is impossible to assemble a fracturing tube of appropriate length according to the on-site conditions. Summary of the invention

[0006] In view of the fact that the above-mentioned prior art is inconvenient to select or make expansion fracturing devices of different lengths on site according to the rock and soil fracturing operation conditions, the utility model provides an expansion fracturing device based on liquid oxygen energy. Through the setting of the technical solution, expansion fracturing devices of different lengths can be freely assembled, and a single fracturing tube of uniform length is more convenient in packaging and transportation.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions: an expansion fracturing device based on liquid oxygen energy, comprising a plurality of fracturing single tubes that can be spliced ​​in series, each fracturing single tube comprising a sleeve and a fracturing assembly arranged in the sleeve, the fracturing assembly comprising a liquid filling tube 1, and the liquid filling tube 1 is axially arranged with at least one infusion hole; both ends of the sleeve are provided with connecting pipes, and the connecting pipes are provided with a liquid filling passage connected with the liquid filling tube 1 in the fracturing assembly, and an exhaust passage for discharging gas in the sleeve is also provided, and the exhaust passage is connected with the inner cavity of the sleeve; the liquid filling passage and the exhaust passage are independently isolated from each other; after two adjacent fracturing single tubes are connected in series, the inner cavities of the sleeves of the two adjacent fracturing single tubes are connected through the exhaust passage of the connecting pipe, and the liquid filling tubes 1 of the two adjacent fracturing single tubes are connected through the liquid filling passage on the connecting pipe.

[0008] Furthermore, the connecting pipe fitting is connecting pipe fitting 1, which is arranged at both ends of the sleeve; when two adjacent fracturing single tubes are connected in series, the two adjacent fracturing single tubes are connected in series through connecting pipe fitting 2, and the connecting pipe fitting 1 of the upper fracturing single tube is connected with the connecting pipe fitting 1 of the lower fracturing single tube through connecting pipe fitting 2; independent liquid filling transition passages and exhaust transition passages are arranged in connecting pipe fitting 2, and the liquid filling transition passage in connecting pipe fitting 2 connects the liquid filling passage of connecting pipe fitting 1 of the upper fracturing single tube with the liquid filling passage of connecting pipe fitting 1 of the lower fracturing single tube; the exhaust transition passage in connecting pipe fitting 2 connects the exhaust passage of connecting pipe fitting 1 of the upper fracturing single tube with the exhaust passage of connecting pipe fitting 1 of the lower fracturing single tube.

[0009] Furthermore, the connecting pipe fitting includes connecting pipe fitting 1 and connecting pipe fitting 2, which cooperate to form a connecting assembly, and connecting pipe fitting 1 and connecting pipe fitting 2 are respectively arranged at both ends of the sleeve; when two adjacent fracturing single tubes are connected in series, connecting pipe fitting 2 of the upper fracturing single tube is connected to connecting pipe fitting 1 of the lower fracturing single tube.

[0010] Furthermore, the second connecting pipe piece is threadably connected to the first connecting pipe piece, and the second connecting pipe piece can rotate relative to the sleeve.

[0011] Furthermore, the outer wall of the connecting pipe fitting is provided with an external thread, and the connecting pipe fitting is provided with an external thread head. The external thread head and the inner wall of the connecting pipe fitting are fixedly connected by ribs arranged at circumferential intervals, and an exhaust port for gas circulation is formed between two adjacent ribs in the circumferential direction, and a plurality of exhaust ports form the exhaust passage.

[0012] Furthermore, a sealing ring is sleeved on the external threaded head of the connecting pipe piece 1.

[0013] Furthermore, the inner wall of the second connecting pipe fitting has an internal thread, and the second connecting pipe fitting is provided with an internal thread head, and rib plates 2 are circumferentially spaced between the outer wall of the internal thread head and the inner wall of the second connecting pipe fitting, and a plurality of exhaust ports 2 form the exhaust transition passage or the exhaust passage, and exhaust ports 2 for gas circulation are formed between two adjacent rib plates 1 in the circumferential direction. When two fracturing single tubes are connected in series, exhaust port 1 and exhaust port 2 are connected, and the external thread head and the internal thread head are threadedly connected.

[0014] Furthermore, the fracturing assembly also includes an ignition mechanism and a liquid absorbing medium. The ignition mechanism is clamped between the liquid filling tube 1 and the liquid absorbing medium so that the ignition mechanism contacts the inner surface of the liquid absorbing medium. The liquid absorbing medium is penetrated with at least one along the axial direction of the liquid filling tube 1. The ignition mechanism is fixedly arranged with at least one along the axial direction of the liquid filling tube 1. The ignition mechanisms are connected in series through wires, and the two ends of the wires pass through the exhaust port 1 and the exhaust port 2 respectively.

[0015] Furthermore, the liquid absorbing medium is paper, cotton core or hemp fiber.

[0016] Furthermore, when multiple single fracturing tubes are connected in series, the top of the single fracturing tube at the uppermost end is connected to a connecting pipe fitting three, and the bottom of the single fracturing tube at the lowermost end is connected to a plug for sealing the single fracturing tube. The connecting pipe fitting three is connected to the liquid filling tube two, and the liquid filling tube two is passed through the exhaust pipe. The bottom end of the exhaust pipe is fixedly connected to the connecting pipe fitting one and communicated with the exhaust port one. After the ignition mechanisms are connected in series by wires, they pass through the connecting pipe fitting three and the exhaust pipe.

[0017] In summary, the utility model has the following beneficial effects:

[0018] (1) The overall expansion fracturing device is freely assembled from a plurality of fracturing single tubes of uniform standard length, wherein a liquid filling tube 1 passes through both ends of a sleeve and is connected to a connecting tube 1 and a connecting tube 2 connected to the end of the liquid filling tube 1, so that a plurality of fracturing single tubes can be connected in series. When fracturing rock and soil in urban construction, open-pit mining, and mine excavation, a down-the-hole drill or a hydraulic rock drill is used to drill holes according to the on-site conditions, and an expansion fracturing device of a suitable length is assembled on-site. At the same time, a single fracturing single tube of standard length is more convenient to pack and transport.

[0019] (2) After two adjacent fracturing single tubes are connected in series, the connecting pipe fitting 1 and the connecting pipe fitting 2 respectively form an exhaust channel for oxygen exhaust and a filling channel for liquid oxygen circulation, so that the expansion single tubes are interconnected, while reducing the mutual influence between the filling channel and the exhaust channel, thereby avoiding the inability to discharge excess gas during filling.

[0020] (3) Each single fracturing tube is provided with an ignition mechanism. The ignition mechanisms are connected in series and extend out of the connecting pipe piece 1 through the exhaust port 1 and / or the exhaust port 2, and are connected to the detonator through a wire, so as to be detonated at a fixed time and at a fixed point.

[0021] (4) A plurality of liquid infusion holes are arranged at intervals on the liquid filling tube. When the sleeve is filled with liquefied gas, the liquid absorption medium can be more quickly and more evenly and efficiently infiltrated through the liquid infusion holes, so that the liquefied gas can be better absorbed and filled in the sleeve and fully absorbed by the liquid absorption medium, which is beneficial to improving the filling efficiency of the liquefied gas and enabling the liquid absorption medium to achieve the energy conversion effect more quickly and fully under the triggering of the ignition mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the fracture-causing single tube structure.

[0023] Figure 2 This is a schematic diagram of the series connection of single fracture tubes.

[0024] Figure 3 It is a cross-sectional view of the connecting pipe fitting 1 and the first connecting pipe fitting 2 in the connected state.

[0025] Figure 4 It is a cross-sectional view of the second type of connecting pipe fitting 2.

[0026] Figure 5 It is a cross-sectional view of the third type of connecting pipe fitting 2.

[0027] Figure 6 for Figure 3 A partial enlarged view of point A in the middle.

[0028] Figure 7 This is the operating arrangement diagram of the expansion fracturing device based on liquid oxygen energy.

[0029] The accompanying drawings are described as follows:

[0030] 1. Fracture-causing single tube; 11. Sleeve; 2. Fracture-causing assembly; 21. Filling tube 1; 211. Infusion hole; 22. Liquid absorption medium; 23. Ignition mechanism; 3. Connecting pipe fitting; 31. Connecting pipe fitting 1; 310. Filling passage; 311. External thread head; 312. Rib 1; 313. Exhaust port 1; 314. Sealing ring; 32. Connecting pipe fitting 2; 320. Filling transition passage; 321. Internal thread head; 322. Rib 2; 323. Exhaust port 2; 324. Holding ring; 4. Connecting pipe fitting 3; 5. Plug; 6. Filling tube 2; 7. Exhaust pipe. DETAILED DESCRIPTION

[0031] The utility model is further described in detail below in conjunction with the embodiments.

[0032] Embodiment 1:

[0033] In specific implementation, Figure 1 , Figure 2 and Figure 7 As shown, an expansion fracturing device based on liquid oxygen energy includes a plurality of fracturing single tubes 1 that can be connected in series, each of which includes a sleeve 11 and a fracturing assembly 2 disposed in the sleeve 11, the fracturing assembly 2 includes a liquid filling tube 21, and the liquid filling tube 21 is axially arranged with at least one liquid infusion hole 211;

[0034] Both ends of the sleeve 11 are provided with connecting pipes 3, and the connecting pipes 3 are provided with a filling passage 310 connected with the filling pipe 21 in the fracturing assembly 2, and an exhaust passage for discharging the gas in the sleeve 11, and the exhaust passage is connected with the inner cavity of the sleeve 11; the filling passage 310 and the exhaust passage are isolated from each other independently; after two adjacent fracturing single tubes 1 are connected in series, the inner cavities of the sleeve 11 of the two adjacent fracturing single tubes 1 are connected through the exhaust passage of the connecting pipe 3, and the filling pipes 21 of the two adjacent fracturing single tubes 1 are connected through the filling passage 310 on the connecting pipe 3. The connection method of the two connecting pipes 3 includes using a composite ferrule-type connecting pipe 3 with equal diameters.

[0035] When filling with liquid oxygen, the liquid infusion hole 211 gradually infiltrates the liquid absorbing medium 22 from the inside to the outside, and while the liquid oxygen is gradually filled into the sleeve 11 from the top to the bottom, the liquid oxygen is transmitted to each layer of the fracturing single tube 1 through the liquid filling channel, and the excess gas is discharged while connecting each layer of the expansion fracturing tube through the exhaust channel. In this way, the length of the expansion fracturing device can be conveniently assembled on site according to the hole depth, thereby avoiding the transportation of long tubular fracturing tubes to the operation site, and the connection method of the fracturing single tube 1 is simple, and the expansion fracturing device of suitable length can be quickly assembled.

[0036] The ignition mechanism 23 includes an ignition head, which is connected to the detonator after being connected in series through a wire. The detonator controls the explosion of the ignition head, and the absorption medium 22 and liquid oxygen are ignited to cause the device to expand. No traditional heating device is required, and there is less pollution. Infusion holes 211 are arranged at intervals on the filling tube 21. When the liquefied gas is filled into the sleeve 11, the absorption medium 22 can be more quickly and more evenly and efficiently infiltrated through the infusion holes 211, so that the liquefied gas is better absorbed and filled in the sleeve 11 and is fully absorbed by the absorption medium 22, which is beneficial to improving the filling efficiency of the liquefied gas and the absorption medium 22 can achieve the energy conversion effect more quickly and fully under the triggering of the ignition mechanism 23.

[0037] Embodiment 2:

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, on the basis of this embodiment 1, the connecting pipe 3 includes a connecting pipe 31, which is arranged at both ends of the sleeve 11; when two adjacent fracturing single tubes 1 are connected in series, the two adjacent fracturing single tubes 1 are connected in series through a connecting pipe 2 32, and the connecting pipe 31 of the upper fracturing single tube 1 is connected with the connecting pipe 31 of the lower fracturing single tube 1 through the connecting pipe 2 32; the connecting pipe 2 32 is provided with a mutually independent liquid filling transition passage 320 and an exhaust transition passage, and the liquid filling transition passage 320 in the connecting pipe 2 32 connects the liquid filling passage 310 of the connecting pipe 31 of the upper fracturing single tube 1 with the liquid filling passage 310 of the connecting pipe 31 of the lower fracturing single tube 1; the exhaust transition passage in the connecting pipe 2 32 connects the exhaust passage of the connecting pipe 31 of the upper fracturing single tube 1 with the exhaust passage of the connecting pipe 31 of the lower fracturing single tube 1.

[0039] When filling with liquid oxygen, the liquid infusion hole 211 gradually infiltrates the liquid absorbing medium 22 from the inside to the outside, and while the liquid oxygen is gradually filled into the sleeve 11 from the top to the bottom, the liquid oxygen is transmitted to each layer of the fracturing single tube 1 through the liquid filling channel, and the excess gas is discharged while connecting each layer of the expansion fracturing tube through the exhaust channel. In this way, the length of the expansion fracturing device can be conveniently assembled on site according to the hole depth, thereby avoiding the transportation of long tubular fracturing tubes to the operation site, and the connection method of the fracturing single tube 1 is simple, and the expansion fracturing device of suitable length can be quickly assembled.

[0040] Both ends of the connecting pipe fitting 2 32 here are threadedly connected to the connecting pipe fitting 1 31, that is, the inner walls of both ends of the connecting pipe fitting 2 32 in this embodiment are provided with internal threads, which can be matched with the threads of the connecting pipe fitting 1 31. When connected in series, the two fracturing single tubes 1 can be connected in series by rotating the connecting pipe fitting 2 32.

[0041] Embodiment 3:

[0042] like Figure 1 , Figure 4 and Figure 7 As shown, on the basis of Example 1, the connecting pipe fitting 3 includes a connecting pipe fitting 1 31 and a connecting pipe fitting 2 32, and the connecting pipe fitting 1 31 and the connecting pipe fitting 2 32 cooperate to form a connecting assembly, and the connecting pipe fitting 1 31 and the connecting pipe fitting 2 32 are respectively arranged at both ends of the sleeve 11; when two adjacent fracturing single tubes 1 are connected in series, the connecting pipe fitting 2 32 of the upper fracturing single tube 1 is connected to the connecting pipe fitting 1 31 of the lower fracturing single tube 1.

[0043] When filling with liquid oxygen, the liquid infusion hole 211 gradually infiltrates the liquid absorbing medium 22 from the inside to the outside, and while the liquid oxygen is gradually filled into the sleeve 11 from the top to the bottom, the liquid oxygen is transmitted to each layer of the fracturing single tube 1 through the liquid filling channel, and the excess gas is discharged while connecting each layer of the expansion fracturing tube through the exhaust channel. In this way, the length of the expansion fracturing device can be conveniently assembled on site according to the hole depth, thereby avoiding the transportation of long tubular fracturing tubes to the operation site, and the connection method of the fracturing single tube 1 is simple, and the expansion fracturing device of suitable length can be quickly assembled.

[0044] One end of the second connecting pipe 32 is threadedly connected to the first connecting pipe 31 to connect the two single fracturing pipes 1 in series.

[0045] Embodiment 4:

[0046] like Figure 1 , Figure 5 and Figure 7 As shown, on the basis of Example 3, the connecting pipe fitting 3 includes a connecting pipe fitting 1 31 and a connecting pipe fitting 2 32, and the connecting pipe fitting 1 31 and the connecting pipe fitting 2 32 cooperate to form a connecting assembly, and the connecting pipe fitting 1 31 and the connecting pipe fitting 2 32 are respectively arranged at both ends of the sleeve 11; when two adjacent fracturing single tubes 1 are connected in series, the connecting pipe fitting 2 32 of the upper fracturing single tube 1 is connected to the connecting pipe fitting 1 31 of the lower fracturing single tube 1, and the connecting pipe fitting 2 32 is threadedly connected to the connecting pipe fitting 1 31, and the connecting pipe fitting 2 32 can rotate relative to the sleeve 11.

[0047] When filling with liquid oxygen, the liquid infusion hole 211 gradually infiltrates the liquid absorbing medium 22 from the inside to the outside, and while the liquid oxygen is gradually filled into the sleeve 11 from the top to the bottom, the liquid oxygen is transmitted to each layer of the fracturing single tube 1 through the liquid filling channel, and the excess gas is discharged while connecting each layer of the expansion fracturing tube through the exhaust channel. In this way, the length of the expansion fracturing device can be conveniently assembled on site according to the hole depth, thereby avoiding the transportation of long tubular fracturing tubes to the operation site, and the connection method of the fracturing single tube 1 is simple, and the expansion fracturing device of suitable length can be quickly assembled.

[0048] The second connecting pipe 32 here can rotate relative to the fracturing tube 1. Specifically, a ring 324 is sleeved on one end of the second connecting pipe 32, an annular groove is set on the outer wall of the second connecting pipe 32, and the sleeve 11 is sealed and connected to the ring. The second connecting pipe 32 is threadedly connected to the first connecting pipe 313 by rotating.

[0049] Embodiment 5:

[0050] On the basis of the single fracturing tube 1 that can be connected in series based on Example 1, Example 2, Example 3 or Example 4, the outer wall of the connecting pipe fitting 31 is provided with an external thread, and an external thread head 311 is provided inside the connecting pipe fitting 31. The external thread head 311 is fixedly connected to the inner wall of the connecting pipe fitting 31 through ribs 312 arranged at intervals in the circumferential direction, and an exhaust port 313 for gas circulation is formed between two adjacent ribs 312 in the circumferential direction, and a plurality of exhaust ports 313 form the exhaust passage. The inner wall of the connecting pipe fitting 2 32 has an internal thread, and an internal thread head 321 is provided in the connecting pipe fitting 2 32. Ribs 2 322 are circumferentially spaced between the outer wall of the internal thread head 321 and the inner wall of the connecting pipe fitting 2 32. Exhaust ports 2 323 for gas circulation are formed between two adjacent ribs 1 312 in the circumferential direction. Several exhaust ports 2 323 form the exhaust transition passage or the exhaust passage. When both ends of the connecting pipe fitting 2 32 have internal threads, and both ends of the internal thread head 321 can be threadedly connected to an external thread head 311, several exhaust ports 2 323 form the exhaust transition passage. When only one end of the connecting pipe fitting 2 32 can be connected, several exhaust ports 2 323 form the exhaust passage with the same function as the exhaust port 1 313. When two fracturing single tubes 1 are connected in series, the exhaust port 1 313 and the exhaust port 2 323 are connected, and the external thread head 311 and the internal thread head 321 are threadedly connected.

[0051] In a specific implementation, the fracturing assembly 2 further includes an ignition mechanism 23 and a liquid absorbing medium 22. The ignition mechanism 23 is clamped between the liquid filling tube 21 and the liquid absorbing medium 22 so that the ignition mechanism 23 contacts the inner surface of the liquid absorbing medium 22. At least one liquid absorbing medium 22 is penetrated along the axial direction of the liquid filling tube 21. At least one ignition mechanism 23 is fixedly arranged along the axial direction of the liquid filling tube 21. The ignition mechanisms 23 are connected in series through wires, and the two ends of the wires pass through the exhaust port 1 313 and the exhaust port 2 323 respectively.

[0052] The liquid absorbing medium 22 is paper, cotton core or hemp fiber.

[0053] Preferably, the liquid absorbing medium 22 is paper, including cylindrical or cylindrical rolled paper.

[0054] like Figure 7As shown, when multiple fracturing single tubes 1 are connected in series, the top of the fracturing single tube 1 located at the uppermost end is connected to a connecting pipe fitting 3 33, and the bottom of the fracturing single tube 1 located at the lowermost end is connected to a plug 5 for sealing the fracturing single tube 1, the connecting pipe fitting 3 33 is connected to a filling pipe 2 6, and the filling pipe 2 6 is passed through an exhaust pipe 7, and the bottom end of the exhaust pipe 7 is fixedly connected to a connecting pipe fitting 1 31 and communicated with an exhaust port 1 313, and each ignition mechanism 23 is connected in series through a wire and then passes through the connecting pipe fitting 3 33 and the exhaust pipe 7.

[0055] Preferably, the liquid filling tube 1 21 and the liquid filling tube 2 6 are both aluminum tubes.

[0056] like Figure 3 , Figure 4 and Figure 5 As shown, the outer wall of the connecting pipe fitting 31 is provided with an external thread, and the connecting pipe fitting 31 is provided with an external thread head 311. The external thread head 311 is fixedly connected to the inner wall of the connecting pipe fitting 31 through ribs 312 arranged at intervals in the circumferential direction, and an exhaust port 313 for gas circulation is formed between two adjacent ribs 312 in the circumferential direction.

[0057] Among them, the inner walls of the connecting pipe fitting 2 32, the connecting pipe fitting 3 33 and the connecting pipe fitting 4 34 all have internal threads, and the connecting pipe fitting 2 32, the connecting pipe fitting 3 33 and the connecting pipe fitting 4 34 are all provided with internal thread heads 321, and rib plates 2 322 are circumferentially spaced between the outer wall of the internal thread head 321 and the inner wall of the corresponding connecting pipe fitting 2 32, the connecting pipe fitting 3 33 or the connecting pipe fitting 4 34, and exhaust ports 2 323 for gas circulation are formed between two adjacent rib plates 1 in the circumferential direction. When two fracturing single tubes 1 are connected in series, the exhaust ports 1 313 and the exhaust ports 2 323 are threadedly connected to form an exhaust channel, and the external thread head 311 and the internal thread head 321 are threadedly connected to form a liquid filling channel.

[0058] like Figure 6 As shown, a sealing ring 314 is sleeved on the external thread head 311 of the connecting pipe 31.

[0059] In this embodiment, the inner circumference of the liquid absorbing medium 22 contacts the liquid filling tube 1 21, and the ignition mechanism 23 is clamped between the liquid filling tube 1 21 and the liquid absorbing medium 22, so that the ignition mechanism 23 contacts the inner surface of the liquid absorbing medium 22. At least one liquid absorbing medium 22 is penetrated along the axial direction of the liquid filling tube 1 21, and at least one ignition mechanism 23 is fixedly arranged along the axial direction of the liquid filling tube 1 21. Each ignition mechanism 23 is connected in series through a wire, and the two ends of the wire pass through the exhaust port 1 313 and the exhaust port 2 323 respectively. One or more liquid absorbing media 22 are arranged in a single fracturing single tube 1, and the number of liquid absorbing media 22 arranged depends on the length of the material.

[0060] The sleeve 11 is a flexible sleeve film, and the specific material may be polypropylene, nylon or polyester.

[0061] The working principle and process of this device:

[0062] First, the gas expansion is positioned, and after drilling and testing whether the hole expanded by the gas expansion is qualified, the assembled expansion fracturing device is placed in the blasthole, and the landfill space between the expansion fracturing device and the top of the blasthole is blocked, and after the landfill soil is compacted, the liquefied gas is filled into the sleeve 11 by a liquid filling machine, and then the wire of the ignition mechanism 23 is connected to the detonator and ignited, so that the liquid absorption medium 22 burns, and under the combustion assistance of oxygen, the liquid absorption medium 22 burns violently, the hot spot spreads rapidly, and the gas volume expands instantly, generating high pressure in the blasthole. The high-pressure gas acts on the wall of the blasthole, generating tensile stress in the rock mass and a large number of cracks on the hole wall. Then, the gas enters the cracks to generate a "gas wedge" effect, causing the rock mass to further break, and finally, under the action of the residual gas, the broken rock moves forward to form a bulge; then, with the rupture of the bulge, the gas pressure drops to zero, and the rock loses the kinetic energy of flying and falls to the ground, so the broken stone does not fly far.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An expansion fracturing device based on liquid oxygen energy, characterized in that: The invention comprises a plurality of single fracturing tubes (1) which can be connected in series, each single fracturing tube (1) comprising a sleeve (11) and a fracturing assembly (2) arranged in the sleeve (11), the fracturing assembly (2) comprising a first liquid filling tube (21), the first liquid filling tube (21) being provided with at least one liquid infusion hole (211) along the axial direction; Both ends of the sleeve (11) are provided with connecting pipes (3), and a filling passage (310) is provided in the connecting pipe (3) and is connected to a filling pipe 1 (21) in the fracturing assembly (2), and an exhaust passage for discharging gas in the sleeve (11) is also provided, and the exhaust passage is connected to the inner cavity of the sleeve (11); the filling passage (310) and the exhaust passage are independently isolated from each other; after two adjacent fracturing single tubes (1) are connected in series, the inner cavities of the sleeves (11) of the two adjacent fracturing single tubes (1) are connected through the exhaust passage of the connecting pipe (3), and the filling pipes 1 (21) of the two adjacent fracturing single tubes (1) are connected through the filling passage (310) on the connecting pipe (3).

2. The expansion fracturing device based on liquid oxygen energy according to claim 1, characterized in that: The connecting pipe piece (3) is a connecting pipe piece 1 (31), which is arranged at both ends of the sleeve (11); when two adjacent fracturing single tubes (1) are connected in series, the two adjacent fracturing single tubes (1) are connected in series via a connecting pipe piece 2 (32), and the connecting pipe piece 1 (31) of the upper fracturing single tube (1) is connected to the connecting pipe piece 1 (31) of the lower fracturing single tube (1) via the connecting pipe piece 2 (32); independent liquid-filled transition passages are arranged in the connecting pipe piece 2 (32). The liquid filling transition passage (320) in the second connecting pipe piece (32) connects the liquid filling passage (310) of the connecting pipe piece 1 (31) of the upper splitting single tube (1) with the liquid filling passage (310) of the connecting pipe piece 1 (31) of the lower splitting single tube (1); the exhaust transition passage in the second connecting pipe piece (32) connects the exhaust passage of the connecting pipe piece 1 (31) of the upper splitting single tube (1) with the exhaust passage of the connecting pipe piece 1 (31) of the lower splitting single tube (1).

3. The expansion fracturing device based on liquid oxygen energy according to claim 2, characterized in that: The connecting pipe fitting (3) comprises a connecting pipe fitting 1 (31) and a connecting pipe fitting 2 (32), the connecting pipe fitting 1 (31) and the connecting pipe fitting 2 (32) cooperate to form a connecting assembly, the connecting pipe fitting 1 (31) and the connecting pipe fitting 2 (32) are respectively arranged at two ends of the sleeve (11); when two adjacent fracturing single tubes (1) are connected in series, the connecting pipe fitting 2 (32) of the upper fracturing single tube (1) is connected to the connecting pipe fitting 1 (31) of the lower fracturing single tube (1).

4. The expansion fracturing device based on liquid oxygen energy according to claim 3, characterized in that: The second connecting pipe piece (32) is threadably connected to the first connecting pipe piece (31), and the second connecting pipe piece (32) can rotate relative to the sleeve (11).

5. The expansion fracturing device based on liquid oxygen energy according to any one of claims 2 to 4, characterized in that: The outer wall of the connecting pipe piece 1 (31) is provided with an external thread, and the connecting pipe piece 1 (31) is provided with an external thread head (311). The external thread head (311) and the inner wall of the connecting pipe piece 1 (31) are fixedly connected via ribs 1 (312) arranged at intervals in the circumferential direction, and an exhaust port 1 (313) for gas circulation is formed between two adjacent ribs 1 (312) in the circumferential direction, and a plurality of exhaust ports 1 (313) form the exhaust passage.

6. The expansion fracturing device based on liquid oxygen energy according to claim 5, characterized in that: A sealing ring (314) is sleeved on the external threaded head (311) of the connecting pipe piece 1 (31).

7. The expansion fracturing device based on liquid oxygen energy according to claim 5, characterized in that: The inner wall of the second connecting pipe piece (32) has an internal thread, and the second connecting pipe piece (32) is provided with an internal thread head (321). Ribs (322) are arranged circumferentially between the outer wall of the internal thread head (321) and the inner wall of the second connecting pipe piece (32). Exhaust ports (323) for gas circulation are formed between two adjacent ribs (312) in the circumferential direction. A plurality of exhaust ports (323) form the exhaust transition passage or the exhaust passage. When two single fracturing tubes (1) are connected in series, the exhaust port (313) and the exhaust port (323) are connected, and the external thread head (311) and the internal thread head (321) are threadedly connected.

8. The expansion fracturing device based on liquid oxygen energy according to any one of claims 2 to 4, characterized in that: The fracturing assembly (2) further comprises an ignition mechanism (23) and a liquid absorbing medium (22); the ignition mechanism (23) is clamped between the first liquid filling tube (21) and the liquid absorbing medium (22) so that the ignition mechanism (23) contacts the inner surface of the liquid absorbing medium (22); at least one liquid absorbing medium (22) is provided along the axial direction of the first liquid filling tube (21); at least one ignition mechanism (23) is fixedly provided along the axial direction of the first liquid filling tube (21); the ignition mechanisms (23) are connected in series via wires, and two ends of the wires pass through the first exhaust port (313) and the second exhaust port (323) respectively.

9. The expansion fracturing device based on liquid oxygen energy according to claim 8, characterized in that: The liquid absorbing medium (22) is paper, cotton core or hemp fiber.

10. The expansion fracturing device based on liquid oxygen energy according to any one of claims 2 to 4, characterized in that: When a plurality of fracturing single tubes (1) are connected in series, the top of the fracturing single tube (1) at the top is connected to a connecting pipe piece three (33), and the bottom of the fracturing single tube (1) at the bottom is connected to a plug (5) for sealing the fracturing single tube (1). The connecting pipe piece three (33) is connected to a liquid filling pipe piece two (6), and the liquid filling pipe piece two (6) is passed through an exhaust pipe (7). The bottom end of the exhaust pipe (7) is fixedly connected to the connecting pipe piece one (31) and communicated with the exhaust port one (313). The ignition mechanisms (23) are connected in series through wires and then pass through the connecting pipe piece three (33) and the exhaust pipe (7).

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