Large-depression-angle long-distance coal seam gas pressure testing drill hole cement mortar hole-sealing method
A technology of coal seam gas pressure and cement mortar, which is applied in the direction of gas discharge, measurement, earthwork drilling and mining, etc., to achieve good slurry blocking effect, prevent leakage, and widely popularize and use
Active Publication Date: 2018-08-03
HUNAN UNIV OF SCI & TECH +2
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Problems solved by technology
[0005] In order to solve the technical problems existing in the existing long-distance hole sealing, the present invention provides a large depression angle and long-distance coal seam gas pressure test drilling cement mortar sealing method,
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[0031] Below in conjunction with the accompanying drawings, a method for sealing holes with cement mortar for large-depression angle and long-distance coal seam gas pressure testing drilling holes of the present invention will be further described in detail.
[0032] 1) According to the designed drilling inclination angle, azimuth, length and other parameters, from the drilling site 1 to the target coal seam 2, the construction diameter is φφ65 ~ φ95mm drilling 4 passes through the middle coal seam or coal line 3, considering the sediment factor, drilling 4 through Pass the target coal seam floor 2-3m for the final drilling, connect the compressed air to the drill pipe, and preliminarily clean the accumulated water and hole slag in the borehole 4;
[0033] 2) Due to the large inclination angle of the depression angle and the long drilling distance, in order to prevent the grout from leaking and breaking through the baffle, two sets of baffles are designed, and each set consists...
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The invention discloses a large-depression-angle long-distance coal seam gas pressure testing drill hole cement mortar hole-sealing method, and belongs to the technical field of coal mine safety production. The method comprises the following steps that two sets of baffles are designed through two pressure-measuring tubes, each set of the baffles is formed by fixing and binding a fixed baffle disk,a movable baffle disk and a rubber mat through iron wires, long-distance fixed-point plugging is carried out by combination expansion cotton yarns and coarse sand pockets, and the problems of slurryleakage and baffle breaking through are solved; the problem that water accumulation in the drill hole is not prone to being discharged can be solved by inserting a grouting tube into a drill hole; andwhen secondary hole sealing is carried out, dry sand is first blown into by compressed air, the expanded cotton yarns and accelerating agents are added into an orifice section to be mixed, and the drill hole can be sealed effectively. The large-depression-angle long-distance coal seam gas pressure testing drill hole cement mortar hole-sealing method is a scientific, reliable, efficient and economical grouting hole-sealing technology, can effectively perform the large-depression-angle long-distance drill hole sealing of coal seam gas pressure testing, and ensures the accuracy of coal seam gaspressure; and the large-depression-angle long-distance coal seam gas pressure testing drill hole cement mortar hole-sealing method has distinctive characteristics that the material source is convenient, the processing is simple, the cost is economical, the method is easy to master for workers, and the method can be popularized widely in the coal mine use.
Description
technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a method for sealing holes with cement mortar for large depression angle and long-distance coal seam gas pressure test drilling. Background technique [0002] Coal mine gas is one of the main factors causing mine safety accidents, and coal seam gas pressure is the necessary driving force and necessary condition for coal and gas outburst. The test of coal seam gas pressure is an important basic work for new mines, reconstruction and expansion of mines, expansion of mines, and production mines. It plays an important role in the prediction of coal and gas outburst risks and the reasonable formulation of outburst prevention measures. Therefore, it is very important to measure the coal seam gas pressure accurately. [0003] At present, the methods for testing coal seam gas pressure sealing holes are mainly divided into two categories: capsule (apron)-s...
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Login to view more IPC IPC(8): E21B33/13E21B47/06E21F7/00
CPCE21B33/13E21B47/06E21F7/00
Inventor 赵训冯涛刘俊钟诗颖韩真理李洪生李树清
Owner HUNAN UNIV OF SCI & TECH
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