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A rapid method for measuring the effective impact radius of drilling

A technology that affects radius and rapid measurement. It is used in surveying, earthwork drilling, wellbore/well components, etc. It can solve the problems of inability to accurately and quickly measure the effective radius of the borehole, and the error of the measurement result is large, and the measurement speed can be achieved. Fast, effective and operability effects

Active Publication Date: 2020-07-31
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

Method used

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  • A rapid method for measuring the effective impact radius of drilling
  • A rapid method for measuring the effective impact radius of drilling
  • A rapid method for measuring the effective impact radius of drilling

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

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

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

[0036] S2: Pla...

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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 measuring the effective impact radius of a borehole. Background technique [0002] In recent years, with the increase of coal mining depth and intensity, the mining environment of mines continues to deteriorate, the geological structure is more complex in shallow coal seams, the gas pressure in coal seams continues to increase, and the gas permeability of coal seams is low, and gas drainage is extremely difficult. The safe production of coal mines has brought great challenges. Because the effective extraction radius of the borehole cannot be accurately measured, the coal seam borehole cannot be reasonably arranged. Accurate and timely determination of the change of coal seam gas pressure in different extraction time is of great significance to the determination of the effective impact radius of coal seam drilling and the reasonable layout of drilling. At present...

Claims

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Application Information

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