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Closed collection method of near-horizontal and long-distance coal samples under pressure at fixed points in coal mines

A long-distance, horizontal technology, applied in the fields of coal mine safety and coalfield geology and exploration, can solve the problems of single-hole single sampling, easy distortion of results, shallow sampling depth, etc., to reduce gas release, ensure authenticity, and reduce engineering workload. Effect

Active Publication Date: 2019-03-29
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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AI Technical Summary

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.

Method used

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  • Closed collection method of near-horizontal and long-distance coal samples under pressure at fixed points in coal mines
  • Closed collection method of near-horizontal and long-distance coal samples under pressure at fixed points in coal mines
  • Closed collection method of near-horizontal and long-distance coal samples under pressure at fixed points in coal mines

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Embodiment Construction

[0036] see Figure 1 to Figure 3 , shows the method for taking coal samples in a coal mine underground near horizontal long-distance pressure-holding and fixed-point airtight collection.

[0037] like figure 1 As shown, the coal mine underground nearly horizontal long-distance coal sample pressure-holding fixed-point airtight taking method may include the following steps:

[0038] Step 1: The trajectory setting of the sampling directional hole, through the exploration of the sampling area, determine the required sampling directional hole, such as figure 2 As shown, the sampling directional hole undulates and extends along the coal seam, and is arranged in a nearly horizontal manner. Preferably, branch holes are avoided. The sampling directional hole can be composed of a casing hole section 1, a directional hole section 2 and a sampling hole section 3, wherein the The casing hole section 1 is close to the orifice, the casing hole section 1 is followed by the directional hole...

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Abstract

A coal mine underground near-horizontal long-distance coal sample pressure-holding fixed-point airtight sampling method, the method first uses the near-horizontal coal seam exploration directional hole to find out the coal seam fluctuation and change law in the sampling area, and completes the design of sampling points and sampling directional holes; Carry out directional drilling to ensure that the directional hole is drilled to the sampling point along the designed trajectory, and then use the pressure-holding sealed sampling drilling tool to carry out sampling drilling and pressure-holding coal samples until the coal samples at all sampling points are collected. This method makes full use of the advantages of real-time measurement and control of directional hole drilling trajectory and long-distance drilling, and the pressure-resistant and sealing characteristics of the pressure-holding and airtight sampling device. Multiple fixed-point sampling in the hole can keep the pressure and seal the coal samples taken, avoid gas escape, ensure the accuracy of coal seam gas parameter testing, and provide accurate reference for 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/08
CPCG01N1/08
Inventor 方俊李泉新龙威成刘柏根刘飞许超刘建林
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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