Pressure-maintaining fixed-point sealed collecting method for underground coal mine nearly-horizontal long-distance coal sample

Abstract

A pressure-maintaining fixed-point sealed collecting method for an underground coal mine nearly-horizontal long-distance coal sample comprises: using a nearly-horizontal coal seam to explore a directional hole so as to find out fluctuation law of the coal seam in a sampling area so that the design of sampling points and sampling directional holes is finished; then, carrying out directional drilling based on segment to ensure that the directional holes are drilled to the sampling points along a design trajectory; using a pressure-maintaining sealed sampling drill to carry out sampling drilling and coal sample pressure-maintaining collecting until coal sample collecting of all the sampling points is finished. In the method, the advantages of directional hole drilling trajectory real-time measurement and control and long-distance drilling and the pressure resisting and sealing characteristics of a pressure-maintaining sealed sampling apparatus are made full use, collection depth of an underground nearly-horizontal coal sample is increased, sampling precision can also be precisely controlled, single-hole multiple fixed-point sampling is achieved, pressure-maintaining sealing can be provided for a collected coal sample, gas escape is avoided, coal seam gas parameter testing accuracy is guaranteed, and accurate reference basis is provided for coal mine engineering design and evaluation.

Description

technical field [0001] The invention relates to the technical fields of coal mine safety and coal field geology and exploration, in particular to a method for collecting coal samples in a near-horizontal and long-distance underground coal mine with pressure-holding and fixed-point airtight collection. Background technique [0002] The coal output of high gas and gas outburst mines accounts for 30% of my country's coal output, and coal and gas outburst accidents occur from time to time, which pose a great threat to mine safety production. Before the gas is extracted and utilized through engineering construction, it is necessary to take coal samples for gas content testing to provide guidance for the rational design of the gas drainage project; at the same time, after the gas drainage treatment is completed, it is also necessary to conduct a gas residual content test to check the gas Whether the extraction effect meets the relevant specification requirements. [0003] At pres...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a coal mine near-horizontal long-distance coal sample pressure-holding and fixed-point airtight collection method, which can solve the defects in the prior art such as shallow sampling depth, low precision, easy distortion of results, single-hole single-time sampling, etc.

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