A new gas energy expansion rock fracturing device

Abstract

The utility model discloses a novel gas energy expansion rock fracturing device, including columnar combustible, along the length direction of columnar combustible arrangement's liquid filling pipe and ignition device, the outer sleeve pipe of wrapping in columnar combustible, liquid filling pipe and ignition device outside and both ends closed, and the exhaust pipe of inserting outer sleeve pipe upper end, liquid filling pipe, ignition device's lead and exhaust pipe respectively from outer sleeve pipe's upper end stretch out, be equipped with on liquid filling pipe for control liquid oxygen through liquid filling pipe and flow into the liquid filling control valve of outer sleeve pipe, be equipped with on exhaust pipe for when filling, control gas through exhaust pipe and discharge, gas energy expansion prevents the flare through exhaust pipe and the outflow of exhaust control valve. The utility model solves the current liquid oxygen expansion rock fracturing equipment gas energy expansion, will have the flare from liquid filling pipe and exhaust pipe and outflow, and there is the problem of bigger security hidden danger.

Description

Technical Field

[0001] This utility model relates to the field of gas-energy expansion fracturing technology, specifically to a novel gas-energy expansion rock fracturing device. Background Technology

[0002] A gas-expanded rock fracturing device is a device used to break rocks. It expands the medium inside the device through physical or chemical means, generating pressure to fracture the rocks.

[0003] The liquid oxygen-expanded rock fracturing device is a common type of gas-powered rock fracturing apparatus. Its fracturing principle is as follows: Liquid oxygen is first injected into the fracturing device located inside the borehole through an in-hole filling device. After the borehole is blocked, a special resistance wire is ignited. The combustion medium in the fracturing device rapidly combusts under the influence of oxygen, releasing heat that instantly vaporizes the liquid oxygen, causing it to expand in volume. This generates a high-pressure shock wave that acts on the borehole wall. When the pressure exceeds the rock's tolerance limit, the rock fractures.

[0004] Existing liquid oxygen-expanded rock fracturing equipment requires a filling pipe and an exhaust pipe. When liquid oxygen is injected into the fracturist through the filling pipe, the vaporized oxygen needs to be discharged through the exhaust pipe. However, when the gas expands in existing liquid oxygen-expanded rock fracturing equipment, flames may burst out from the filling pipe and exhaust pipe, posing a significant safety hazard. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a novel gas-expanded rock fracturing device, which solves the problem that existing liquid oxygen-expanded rock fracturing equipment may have flames shooting out from the filling pipe and exhaust pipe during gas expansion, posing a significant safety hazard.

[0006] This utility model provides a novel gas-energy-expanded rock fracturing device, comprising a columnar combustible material, a liquid filling pipe and an ignition device arranged along the length of the columnar combustible material, an outer sleeve wrapped around the columnar combustible material, the liquid filling pipe and the ignition device and closed at both ends, and an exhaust pipe inserted into the upper end of the outer sleeve. The lead wires of the liquid filling pipe, the ignition device and the exhaust pipe extend from the upper end of the outer sleeve respectively.

[0007] The filling pipe is equipped with a filling control valve for controlling the flow of liquid oxygen into the outer sleeve through the filling pipe;

[0008] The exhaust pipe is equipped with an exhaust control valve for controlling the gas to be discharged through the exhaust pipe when the liquid is filled and for preventing flames from shooting out through the exhaust pipe when the gas expands.

[0009] Furthermore, the filling control valve is a one-way valve.

[0010] Furthermore, the exhaust control valve includes:

[0011] The valve body is connected to the exhaust pipe. The valve body has a valve cavity, and an annular valve seat is provided at one end of the valve cavity that communicates with the exhaust pipe. An annular step is provided at the other end of the valve cavity that communicates with the inside of the outer sleeve.

[0012] The valve core is located inside the valve cavity. One end of the valve core is provided with a retaining ring portion that is supported on the annular step and adapted to the inner wall of the valve cavity. The other end of the valve core is provided with a conical sealing portion that is adapted to the valve port in the middle of the annular valve seat. The valve core is provided with an exhaust channel that connects the outer periphery of the valve core and the end of the valve core near the annular step.

[0013] A spring is sleeved around the valve core and supported between the annular valve seat and the retaining ring.

[0014] Furthermore, the exhaust passage includes a central shaft hole opened at one end of the valve core near the annular step and a plurality of radially communicating holes distributed around the central shaft hole.

[0015] Furthermore, the exhaust pipe includes an exhaust main pipe and an exhaust branch pipe. The exhaust main pipe is coaxially disposed outside the filling pipe, and an annular channel is formed between the exhaust main pipe and the filling pipe. One end of the filling pipe that extends into the outer sleeve passes through the exhaust main pipe and is fitted with the filling control valve. The end of the exhaust main pipe that extends into the outer sleeve is sealed between the exhaust main pipe and the outer wall of the filling pipe. The exhaust branch pipe is connected to the part of the exhaust main pipe that extends into the outer sleeve and communicates with the annular channel. The exhaust control valve is installed on the exhaust branch pipe.

[0016] Furthermore, a multi-port connector is installed at one end of the filling tube that extends into the outer tube, and each connector of the multi-port connector is connected to a filling branch tube extending along the outer tube.

[0017] Furthermore, one end of the outer sleeve is provided with a threaded interface, and the exhaust main pipe is provided with a threaded connector, which is threadedly connected to the threaded interface.

[0018] Furthermore, the ignition device includes multiple electronic fire starters distributed along the length of the columnar combustible material and electrically connected to the lead wires respectively. Each of the liquid-filled branch tubes and the lead wires of the ignition device are fixed to the outside of the columnar combustible material by multiple tapes distributed along the length.

[0019] The beneficial effects of this utility model are reflected in:

[0020] In use, the gas-energy-expanded rock fracturing device is first installed into the borehole, and liquid oxygen is filled into the outer casing through the filling pipe. Then, the borehole is blocked and the filling pipe is cut off from the position where it extends out of the borehole. During the liquid oxygen filling process, the oxygen volatilized in the outer casing can be discharged through the exhaust pipe, which can prevent the gas pressure in the outer casing from becoming too high. After blocking the borehole, the columnar combustible material in the outer casing is ignited by the ignition device. The columnar combustible material rapidly explodes under the action of oxygen, and the heat released causes the liquid oxygen to vaporize instantly, expanding in volume, thereby achieving rock expansion and fracturing. Since the filling pipe is equipped with a liquid filling control valve and the exhaust pipe is equipped with an exhaust control valve, the liquid filling control valve can prevent the flame from shooting out of the filling pipe and the exhaust control valve can prevent the flame from shooting out of the exhaust pipe during gas expansion. This can solve the safety hazard of flames shooting out during gas expansion. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 This is an assembly perspective view of an embodiment of the present utility model;

[0023] Figure 2 This is a structural schematic diagram of the present invention when the outer sleeve is concealed in an embodiment;

[0024] Figure 3 This is a longitudinal sectional view of an embodiment of the present utility model;

[0025] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0026] In the attached diagram, 100 - columnar combustible material; 200 - filling pipe; 210 - multi-port connector; 220 - filling branch pipe; 300 - ignition device; 310 - lead wire; 320 - electronic fire starter; 400 - outer sleeve; 410 - threaded interface; 500 - exhaust pipe; 510 - main exhaust pipe; 511 - threaded connector; 520 - exhaust branch pipe; 600 - filling control valve; 700 - exhaust control valve; 710 - valve body; 711 - valve cavity; 712 - annular valve seat; 713 - annular step; 720 - valve core; 721 - retaining ring; 722 - conical sealing part; 723 - exhaust channel; 7231 - central shaft hole; 7232 - radial connecting hole; 730 - spring. Detailed Implementation

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0029] like Figures 1-4 As shown, this utility model embodiment provides a novel gas-inflated rock fracturing device, including a columnar combustible material 100, a liquid filling pipe 200 and an ignition device 300 arranged along the length of the columnar combustible material 100, an outer sleeve 400 wrapped around the columnar combustible material 100, the liquid filling pipe 200 and the ignition device 300 and closed at both ends, and an exhaust pipe 500 inserted into the upper end of the outer sleeve 400. The lead wire 310 of the liquid filling pipe 200 and the ignition device 300 and the exhaust pipe 500 extend from the upper end of the outer sleeve 400 respectively.

[0030] The filling pipe 200 is equipped with a filling control valve 600 for controlling the flow of liquid oxygen into the outer casing 400 through the filling pipe 200.

[0031] In this embodiment, the liquid filling control valve 600 is specifically a one-way valve. Liquid oxygen can only flow in through the one-way valve and cannot flow out. After liquid oxygen is filled, the liquid filling pipe 200 extending out of the blast hole can be cut off. The one-way valve can prevent liquid oxygen from flowing out, and at the same time, it can also prevent flames from bursting out through the liquid filling pipe 200 when the gas expands.

[0032] The exhaust pipe 500 is equipped with an exhaust control valve 700 for controlling the gas to be discharged through the exhaust pipe 500 when the liquid is filled and for preventing flames from shooting out through the exhaust pipe 500 when the gas expands.

[0033] In this embodiment, refer to Figure 4 The exhaust control valve 700 includes a valve body 710 and a valve core 720.

[0034] The valve body 710 is connected to the exhaust pipe 500. The valve body 710 has a valve cavity 711 inside. One end of the valve cavity 711 that communicates with the exhaust pipe 500 is provided with an annular valve seat 712. The other end of the valve cavity 711 that communicates with the inside of the outer sleeve 400 is provided with an annular step 713.

[0035] The valve core 720 is disposed in the valve cavity 711. One end of the valve core 720 is provided with a retaining ring portion 721 that is supported on the annular step 713 and adapted to the inner wall of the valve cavity 711. The other end of the valve core 720 is provided with a conical sealing portion 722 that is adapted to the valve port in the middle of the annular valve seat 712. The valve core 720 is provided with an exhaust channel 723 that connects the outer periphery of the valve core 720 and the end of the valve core 720 near the annular step 713. The exhaust channel 723 specifically includes a central shaft hole 7231 opened at the end of the valve core 720 near the annular step 713 and a plurality of radial connecting holes 7232 distributed around the central shaft hole 7231.

[0036] Spring 730 is sleeved around valve core 720 and supported between annular valve seat 712 and retaining ring 721.

[0037] During the filling process, the air pressure inside the outer sleeve 400 is relatively low. Under the action of the spring 730, the valve core 720 opens its valve port. Oxygen generated from the evaporation of liquid oxygen can enter the space between the valve chamber 711 and the valve core 720 through the exhaust channel 723 within the valve core 720, then enter the exhaust pipe 500 through the valve port, and finally be discharged through the exhaust pipe 500. When the gas expands, the air pressure inside the outer sleeve 400 increases instantaneously, pushing the valve core 720 to overcome the elastic force of the spring 730. This causes the conical sealing part 722 of the valve core 720 to block the valve port, thus preventing gas carrying flames from escaping from the exhaust pipe 500. Therefore, the exhaust control valve 700 with the above structure not only meets the exhaust requirements but also prevents flames from escaping. It requires no manual switching and has a simple and reliable structure.

[0038] In some embodiments, refer to Figure 2 and Figure 4 The exhaust pipe 500 includes an exhaust main pipe 510 and an exhaust branch pipe 520. The exhaust main pipe 510 is coaxially disposed outside the filling pipe 200, and an annular channel is formed between the exhaust main pipe 510 and the filling pipe 20. One end of the filling pipe 20 extends into the outer sleeve 400 and passes through the exhaust main pipe 510 and is equipped with a filling control valve 600. The end of the exhaust main pipe 510 extending into the outer sleeve 400 is sealed with the outer wall of the filling pipe 20. The exhaust branch pipe 520 is connected to the part of the exhaust main pipe 510 extending into the outer sleeve 400 and communicates with the annular channel. The exhaust control valve 700 is installed on the exhaust branch pipe 520.

[0039] In this embodiment, the exhaust main pipe 510 and the filling pipe 20 are coaxially arranged and connected as one unit. During assembly, it is only necessary to open a hole at one end of the outer sleeve 400 to install the exhaust main pipe 510. The structure is compact and easy to assemble. At the same time, an exhaust branch pipe 520 is provided on the side of the part of the exhaust main pipe 510 that extends into the outer sleeve 400, which facilitates the installation of the exhaust control valve 700.

[0040] In some embodiments, continue to refer to Figure 2 and Figure 4 A multi-port connector 210 is installed at one end of the filling tube 200 that extends into the outer tube 400. Each connector of the multi-port connector 210 is connected to a filling branch tube 220 extending along the outer tube 400. In this way, during filling, liquid oxygen can be dispersed into various parts of the outer tube 400 through each filling branch tube 220, making the filling more uniform.

[0041] In some embodiments, refer to Figure 4 One end of the outer tube 400 is provided with a threaded interface 410, and the exhaust main tube 510 is provided with a threaded connector 511. The threaded connector 511 is threaded into the threaded interface 410, which can further improve the convenience of assembly.

[0042] In some embodiments, refer to Figure 2 The ignition device 300 includes multiple electronic fire starters 320 distributed along the length of the columnar combustible material 100 and electrically connected to the lead wire 310. When the gas expands, the electronic fire starters 320 can be controlled by the lead wire 310 to ignite and detonate. Each liquid-filling branch pipe 220 and the lead wire 310 of the ignition device 300 are fixed to the outside of the columnar combustible material 100 by multiple tapes distributed along the length. During filling, the liquid-filling branch pipe 220 and the lead wire 310 of the ignition device 300 can be fixed to the outside of the columnar combustible material 100 with tape first, and then the tied columnar combustible material 100 can be put into the outer sleeve 400, which is convenient for filling.

[0043] In this embodiment, the gas-inflated rock fracturing device is first installed into the borehole, and liquid oxygen is injected into the outer casing 400 through the filling pipe 200. Then, the borehole is blocked, and the filling pipe 200 is cut off from its protruding position. During the liquid oxygen injection process, the oxygen volatilized inside the outer casing 400 can be discharged through the exhaust pipe 500 to prevent excessive pressure inside the outer casing 400. After blocking the borehole, the columnar combustible material 100 inside the outer casing 400 is ignited using the ignition device 300. When ignited, the columnar combustible material 100 rapidly explodes under the aid of oxygen, releasing heat that instantly vaporizes the liquid oxygen, causing it to expand in volume and thus expand and crack the rock. Because the filling pipe 200 is equipped with a filling control valve 600 and the exhaust pipe 500 is equipped with an exhaust control valve 700, when the gas expands, the filling control valve 600 can prevent the flame from escaping from the filling pipe 200, and the exhaust control valve 700 can prevent the flame from escaping from the exhaust pipe 500. This solves the safety hazard of flames escaping when the gas expands.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, 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 or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A novel gas-inflated rock fracturing device, comprising a columnar combustible material, a filling pipe and an ignition device arranged along the length of the columnar combustible material, an outer sleeve wrapped around the columnar combustible material, the filling pipe and the ignition device and closed at both ends, and an exhaust pipe inserted into the upper end of the outer sleeve, wherein the lead wires of the filling pipe, the ignition device and the exhaust pipe respectively extend from the upper end of the outer sleeve, characterized in that: The filling pipe is equipped with a filling control valve for controlling the flow of liquid oxygen into the outer sleeve through the filling pipe; The exhaust pipe is equipped with an exhaust control valve for controlling the gas to be discharged through the exhaust pipe when the liquid is filled and for preventing flames from shooting out through the exhaust pipe when the gas expands.

2. The novel gas-expanded rock fracturing device according to claim 1, characterized in that: The filling control valve is a one-way valve.

3. The novel gas-expanded rock fracturing device according to claim 1, characterized in that: The exhaust control valve includes: The valve body is connected to the exhaust pipe. The valve body has a valve cavity, and an annular valve seat is provided at one end of the valve cavity that communicates with the exhaust pipe. An annular step is provided at the other end of the valve cavity that communicates with the inside of the outer sleeve. The valve core is located inside the valve cavity. One end of the valve core is provided with a retaining ring portion that is supported on the annular step and adapted to the inner wall of the valve cavity. The other end of the valve core is provided with a conical sealing portion that is adapted to the valve port in the middle of the annular valve seat. The valve core is provided with an exhaust channel that connects the outer periphery of the valve core and the end of the valve core near the annular step. A spring is sleeved around the valve core and supported between the annular valve seat and the retaining ring.

4. The novel gas-expanded rock fracturing device according to claim 3, characterized in that: The exhaust passage includes a central shaft hole located at one end of the valve core near the annular step and a plurality of radially communicating holes distributed around the central shaft hole.

5. The novel gas-expanded rock fracturing device according to claim 1, characterized in that: The exhaust pipe includes an exhaust main pipe and an exhaust branch pipe. The exhaust main pipe is coaxially disposed outside the filling pipe, and an annular channel is formed between the exhaust main pipe and the filling pipe. One end of the filling pipe extends into the outer sleeve, passes through the exhaust main pipe, and is fitted with the filling control valve. The end of the exhaust main pipe extending into the outer sleeve is sealed between the exhaust main pipe and the outer wall of the filling pipe. The exhaust branch pipe is connected to the part of the exhaust main pipe extending into the outer sleeve and communicates with the annular channel. The exhaust control valve is installed on the exhaust branch pipe.

6. The novel gas-expanded rock fracturing device according to claim 5, characterized in that: A multi-port connector is installed at one end of the filling tube that extends into the outer tube, and each connector of the multi-port connector is connected to a filling branch tube extending along the outer tube.

7. The novel gas-expanded rock fracturing device according to claim 5, characterized in that: One end of the outer sleeve is provided with a threaded interface, and the exhaust main pipe is provided with a threaded connector, which is threadedly connected to the threaded interface.

8. The novel gas-expanded rock fracturing device according to claim 6, characterized in that: The ignition device includes multiple electronic fire starters distributed along the length of the columnar combustible material and electrically connected to the lead wires respectively. The liquid filling branch tubes and the lead wires of the ignition device are fixed to the outside of the columnar combustible material by multiple tapes distributed along the length.

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