Large-depression-angle long-distance coal seam gas pressure testing drill hole cement mortar hole-sealing method

Abstract

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...

AI Technical Summary

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, which is not only "scientific, reliable, efficient and economical", but also focuses on solving large-scale The technical problem of fixed-point grouting and effective discharge of accumulated water in the hole during the process of grouting

Images