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Method of quickly determining effective influence radius of drilling hole

A technology for rapid measurement of influence radius, which is applied in surveying, earthwork drilling, gas discharge, etc. It can solve the problems of inaccurate and rapid measurement of the effective radius of borehole influence and large error in measurement results, achieving fast measurement speed and effective Good, operable effect

Active Publication Date: 2019-11-05
CHINA UNIV OF MINING & TECH
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Problems solved by technology

At present, most coal mines in my country measure the effective impact radius of boreholes by drilling on-site, and then use sensors to measure coal seam gas pressure. This method cannot accurately and quickly measure the effective impact radius of boreholes, and the measurement results are inaccurate. bigger

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  • Method of quickly determining effective influence radius of drilling hole
  • Method of quickly determining effective influence radius of drilling hole
  • Method of quickly determining effective influence radius of drilling hole

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Embodiment Construction

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0034] Such as Figure 1 to Figure 2 As shown, a method for quickly determining the effective impact radius of a drilling hole specifically includes the following steps:

[0035] S1: Construct launch holes 6 and several detection holes 7 in the upper coal seam of the bottom-draining roadway. The detection holes 7 and the launch holes 6 are arranged in a cross shape. The diameter of the launch hole 6 is 113mm. The aperture is 200mm;

[0036...

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Abstract

The invention discloses a method of quickly determining the effective influence radius of a drilling hole. A transmitting hole and detecting drilling holes are constructed in a coal seam, then a transmitting source is arranged in the transmitting hole, detectors are arranged in the detecting drilling holes, the change rule of coal-seam gas pressure in different extraction time is detected by utilizing an accurate CT detecting technology, the effective extraction radius of the drilling hole after being extracted for a certain time is determined according to the change of the coal-seam gas pressure, and the method has the great significance of reasonable arrangement of the drilling hole, improvement of the extraction efficiency, and reduction of coal and gas outburst disasters; and the testing method is simple, the operability is high, the determining speed is high, the effect is good, and the method has the wide practicability in the field.

Description

Technical field [0001] The invention relates to the field of gas drainage, in particular to a method for quickly determining the effective influence radius of a borehole. Background technique [0002] In recent years, with the increase of coal mining depth and intensity, the mining environment of mines has continued to deteriorate. The geological structure is more complex than the shallow coal seams, the gas pressure of the coal seams is increasing, and the gas permeability of the coal seams is low, which makes gas extraction extremely difficult. The safety production of coal mines has brought great challenges. As the effective extraction radius of the borehole cannot be accurately measured, the coal seam borehole cannot be reasonably arranged. It is of great significance to accurately and timely determine the change of coal seam gas pressure during different extraction periods, which is of great significance to the determination of the effective radius of coal seam drilling and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06E21F7/00
CPCE21B47/06E21F7/00
Inventor 林柏泉赵洋刘厅宋浩然李彦军
Owner CHINA UNIV OF MINING & TECH
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