Device and method for improving smoothness of drilled hole wall of coal seam
A smoothness and hole wall technology, applied in drilling equipment and methods, drilling tools, drilling equipment, etc., can solve problems such as roughness, few reports, and affecting the sealing effect of the hole sealer on the hole, and achieve good sealing performance , the effect of improving accuracy
Inactive Publication Date: 2017-06-20
NORTH CHINA INST OF SCI & TECH
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Problems solved by technology
[0004] During the drilling construction process, due to the sloshing of the drill pipe, soft coal quality and stress concentration around the drilling hole, the wall surface of the coal seam drilling hole is often rough, which will definitely affect the sealing effect of the hole sealing device on the hole
[0005] In the open literature, the research on drilling construction mainly focuses on improving the drilling depth, preventing the hole from collapsing, and effectively removing the drilling cinder, but there are few studies on how to improve the smoothness of the drilling wall. There are reports
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Embodiment Construction
[0021] as attached Figure 1-3 As shown, a device for improving the smoothness of the coal seam borehole wall includes a drilling rig 1, a drill pipe 2, an air pipe 3, a grinding device 4, a gas flow converter 5, a compressed air device and a power supply; the power supply is the drilling rig 1 Power supply, the air pressure device provides high-pressure gas for the air pipe 3; the drill pipe 2 is installed on the drilling rig 1, and the front end of the drill pipe 1 is sealed and connected with the grinding device 4; the rubber sleeve 4-1 included in the grinding device 4, And the steel grit 4-2 arranged on the outside of the rubber sheath 4-1; the ventilation pipe 3 axially passes through the drilling machine 1, the drill pipe 2 and the grinding device 4 in turn, and its rear end is connected to the air pressure device through the air pressure pipe 6 , the front end protrudes from the front end of the grinding device 4, and a gas flow converter 5 is installed at the position...
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The invention relates to a device and method for improving smoothness of a drilled hole wall of a coal seam. Abraded coal slag can be removed while protruded parts of coal bodies around a drilled hole are abraded, and the unsmooth surface of the drilled hole of the coal seam is made to be the smooth surface. If a hole packing is placed in the position of the surface of the drilled hole, good sealing performance is necessarily achieved, and finally improving of the accuracy of measured data of gas pressure of the coal seam, the extraction concentration of gas and the effect of coal seam water injection is achieved.
Description
technical field [0001] The invention relates to a device for improving the roughness of the coal seam borehole wall, in particular to a device and a method for improving the smoothness of the coal seam borehole wall. Background technique [0002] In coal mines, coal seam gas pressure measurement, gas drainage and coal seam water injection all need to seal the borehole. The hole sealer is a commonly used drilling hole sealing device, and its sealing performance is the key to the success of the above work. [0003] The hole sealer is generally composed of one or more layers of steel wire mesh, inner wall rubber and outer surface rubber; by injecting high-pressure expansion fluid into the hole sealer, the hole sealer expands, and the rubber on the outer surface contacts the wall of the drilled hole to hinder Fluids (including gases and liquids) penetrate to achieve the sealing function. [0004] During the drilling construction process, due to the sloshing of the drill pipe, s...
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IPC IPC(8): E21B12/00E21B7/00
CPCE21B7/00E21B12/00
Inventor 齐黎明梁为陈学习程根银
Owner NORTH CHINA INST OF SCI & TECH