Test method of drill hole gas extraction effective radius

A technology of effective radius and gas drainage, which is applied in the direction of gas discharge, earthwork drilling, measuring devices, etc., can solve the problems that the effective range of drainage cannot be accurately determined, the effective range of drilling radius cannot be measured, and the testing process is cumbersome.

Inactive Publication Date: 2013-06-05
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0003] However, the currently commonly used measurement methods have large engineering quantities, complex and cumbersome processes, or cannot determine the effective range of the drilling radius.
Aiming at the disadvantages of the current test method, comput...

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  • Test method of drill hole gas extraction effective radius
  • Test method of drill hole gas extraction effective radius
  • Test method of drill hole gas extraction effective radius

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Embodiment Construction

[0124] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0125] figure 1 A method for testing the effective radius of borehole gas drainage provided by the implementation of the present invention is shown. The method includes:

[0126] In step S101, select SF 6 The gas tracer method was used for on-site testing, and the detection of SF in the sampling hole was tested under different hole distances. 6 Gas time T i (i=1,2,3...);

[0127] In step S102, according to the occurrence of coal seams at the test site, a model is established based on Darcy's law to simulate the SF 6 The flow of gas in the gas seepage field;

[0128] During the modeling proces...

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Abstract

The invention discloses a test method of a drill hole gas extraction effective radius. The test method of the drill hole gas extraction effective radius comprises the following steps: selecting a sulfur hexafluoride (SF6) gas trace method to conduct spot test, under the condition of testing different pitches, sampling and collecting the SF6 gas required time which is detected by a detection hole, establishing a module at the basis of the Darcy law based on the occurrence of coal seam condition of the detecting location, simulating the flowing condition of the SF6 gas in a gas seepage field; calculating and obtaining the required time Ti'of the SF6 gas which moves to a sampling and collecting test hole, calculating a sampling and collecting effective coefficient a; detecting the required time of the SF6 gas based on the sampling and collecting detection hole detected by the SF6 gas trace method, calculating the required time which lowers the relative distance gas pressure below an effective value, and calculating the drill hole gas extraction effective radius based on power function relation between drill hole sampling and collecting gas effective extraction effective radius r (m) and the sampling and collecting time t (d). The test method of the drill hole gas extraction effective radius adopts combination of a direct method and an indirect method, and solves the problems that a plurality of defects exist by using the direct method to detect a drill hole gas extraction radius and extraction effective index is difficult to ascertain.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for testing the effective radius of borehole gas drainage. Background technique [0002] Drainage by bed-by-bed drilling is the most commonly used drainage technical measure in coal mining working faces of high-gas mines and coal and gas outburst mines. It plays a vital role in reducing coal seam gas in the working face. The main basis for design and layout is the effective radius of drainage of boreholes. The effective radius of drainage refers to the coal seam gas pre-extraction, under the combined influence of the coal seam gas pressure gradient and the borehole drainage negative pressure, the gas in the coal body around the borehole continuously enters the borehole and is pumped away, forming a A circular-like area of ​​influence centered on the borehole. Drainage effective radius is the main factor affecting the pre-drainage effect of bedding boreh...

Claims

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Application Information

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IPC IPC(8): G01B13/08E21F7/00
Inventor 郝天轩宋超邓增社陈通
Owner HENAN POLYTECHNIC UNIV
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