Extraction method for downhole downward drilling of coal mines
A drainage and coal mine technology, which is applied in the field of coal mining safety, can solve the problems that affect the gas drainage effect, the downward drilling is easy to collapse, and the drilling water and slag are stored, so as to shorten the gas drainage time and improve the gas drainage. Efficiency, the effect of realizing safe production
Inactive Publication Date: 2018-11-30
GUIZHOU PANJIANG REFINED COAL
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a coal mine downhole drainage method, which is used to solve the traditional gas drainage method that the downhole is easy to collapse, the hole is not sealed tightly, and water and slag are stored in the hole. , the problem that affects the effect of gas drainage
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Embodiment Construction
[0028] A coal mine downhole drainage method comprising the following steps:
[0029] Step 1: using drill pipe 1 to carry out drilling construction in the coal seam;
[0030] Step 2: After the drilling construction is completed, pull out the drill pipe 1 from the inside of the borehole for 0.9m-1.1m, and disconnect the end of the drill pipe 1 near the hole of the drill hole from the main body of the drill pipe 1;
[0031] Step 3: Install the water blowing pipe 6 inside the extraction screen 4, and connect the hole bottom fixing frame 3 to one end of the extraction screen 4;
[0032] Step 4: Extend the end of the drainage screen 4 with the hole bottom fixing frame 3 from the disconnection of the drill pipe 1 body described in step 2 to a position 1m away from the bottom of the hole gradually along the inside of the drill pipe 1 body;
[0033] Step 5: The hole bottom fixing frame 3 pushes the open and close drill bit 2 at the front end of the drill pipe 1 into the drill hole, th...
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Abstract
The invention discloses an extraction method for downhole downward drilling of coal mines. The extraction method has the advantages that after the extraction and drilling construction is performed atthe proper position, an extraction sieve pipe and a water blowing pipe are lowered via a drill rod to the bottom part of a drilling hole; a bag type grouting hole sealing device is used for grouting under the pressure condition, so as to ensure the tightness in sealing of the drilling hole; by arranging a water blowing device at one end of the water blowing pipe on an opening of the drilling hole,the accumulated water and slag in the extraction drilling hole are blown out of the drilling hole by the pressure of compressed wind, so as to effectively discharge the coal rock residue out of the drilling hole; the subsequent gas extraction effect is good, and the problems of influence to the gas extraction effect due to easiness in hole collapsing, untight sealing of hole and accumulation of water and residue in the drilling hole in the traditional gas extraction method are solved; the gas extraction and drainage efficiency is improved, the gas extraction and drainage time is shortened, and the safety production is realized.
Description
technical field [0001] The invention relates to the technical field of coal mining safety, in particular to an underground drilling method for coal mines. Background technique [0002] Gas outburst is a safety accident that is prone to occur in coal mines. The high-concentration gas gushing out of coal and gas outbursts will cause disasters such as gas combustion and explosion when it encounters a fire source. In this case, it is necessary to drain the outburst gas from the coal mine To ensure the safety of personnel and equipment, the current traditional gas drainage method has the problems of easy hole collapse, poor sealing, and water and slag in the hole, which affect the drainage effect. Therefore, it is necessary to propose a The new coal mine downhole drilling drainage method is used to overcome the defects and deficiencies of the traditional gas drainage method, improve the efficiency of gas drainage, shorten the time of gas drainage, and realize safe production. C...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21F7/00E21B43/00E21B43/10E21B33/13E21B21/00E21B21/16
CPCE21F7/00E21B21/00E21B21/16E21B33/13E21B43/00E21B43/10
Inventor 纪绍思邓德华旷永华金泽平王君蒋泽照刘发全彭从庆毛强刚白洪发
Owner GUIZHOU PANJIANG REFINED COAL