Portable coal seam drilling expansion fracturing anti-reflection device and method
A portable, coal seam technology, applied in safety devices, earthwork drilling, wellbore/well components, etc., can solve problems such as cumbersome use process, difficulty in hole filling, loss of slurry fluidity, etc., to achieve easy portability and improve mixing The effect of efficiency and safety
Active Publication Date: 2022-08-02
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0005]
The purpose of the present invention is: in order to solve the problem that when the static expansion material is used, the water agent and the expansion material need to be quantitatively weighed and stirred on site, and the use process is relatively cumbersome. effect, providing a portable coal seam drilling expansion fracturing anti-permeability device
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.
[0039] Embodiments of the present invention:
[0040] like Figure 1 to Figure 6 As shown, a portable coal seam drilling expansion fracturing and anti-reflection device includes a plurality of shells 2 connected in sequence;
[0041] A plurality of mixing units 7 are arranged coaxially in the casing 2; each mixing unit 7 is provided with a water flow layer 4 and a solid layer 5 of an expanding material;
[0042] Each water flow layer 4 is provided with an annular area, and each annular area is provided with a plurality of water outlet holes 14 at intervals; some water outlet holes of the water flow layer 4 are used as connecting holes 15;
[0043] The expansion material solid layer 5 is provided with a thin baffle 6, the upper surface of the thin baffle 6 is connected with the connection hole 15 o...
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The portable coal seam drilling expansion fracturing anti-reflection device comprises a plurality of shells connected in sequence, a water inlet pipeline and a mixing unit are arranged in the shells, the mixing unit is provided with a water flow layer and an expansion material solid layer, and the water inlet pipeline is connected with a water tank through a hollow water injection needle; the water tank is provided with a control box, an electromagnetic valve, a flow meter, a hose, an operation panel and a starting switch. Quantitative water is injected into the expansion material solid layer of the shell through the water tank and the hollow water injection needle, uniform mixing is completed through a water flow layer structure, the device is sequentially pushed into a coal seam drill hole, static expansion stress is generated after the expansion material is hydrated to promote the coal seam to generate cracks, and therefore the coal seam breathability is improved; the problems that the underground expansion material is not easy to store and stir, the hole filling efficiency is low and the like are solved, and the coal seam drilling expansion cracking construction efficiency and the cracking effect are effectively guaranteed.
Description
technical field [0001] The invention belongs to the technical field of coal mine gas prevention and control, and in particular relates to a portable coal seam borehole expansion-induced cracking and anti-penetration device. Background technique [0002] Coal and gas outburst is one of the main disasters affecting the safety production of coal mines, seriously threatening the safety production of coal mines. With the increase of coal seam mining depth, coal seam in-situ stress and gas pressure continue to increase, resulting in a decrease in coal seam permeability; at the same time, coal mine geology is complex, which greatly increases the difficulty of coal mine gas drainage. Therefore, before gas extraction in coal mines, the coal seam should be treated with increased permeability to improve the efficiency of gas extraction, so as to ensure the purpose of safe underground work and scientific coal mining. [0003] Static expansion cracking and anti-reflection technology is ...
Claims
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IPC IPC(8): E21B43/26E21F7/00
CPCE21B43/26E21F7/00Y02A20/00
Inventor 张嘉勇左晨曦崔啸巩学敏苏霈洋张瑶邱艳兵
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY