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Coal bed gas drainage effective radius measuring method

A technology of coal seam gas and effective radius, applied in the field of effective radius measurement of coal seam gas drainage, can solve the problems of inaccurate design parameters and lack of scientific theory, and achieve the effect of improving accuracy

Inactive Publication Date: 2010-09-08
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the design parameters of the gas drainage boreholes are selected according to on-site experience, without scientific theory as the basis, and the design parameters are inaccurate

Method used

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  • Coal bed gas drainage effective radius measuring method
  • Coal bed gas drainage effective radius measuring method
  • Coal bed gas drainage effective radius measuring method

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Experimental program
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Embodiment Construction

[0019] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0020] 1. According to the "Basic Indicators of Coal Mine Gas Drainage", the coal seam gas pre-drainage rate is generally greater than 30%, that is, the gas content after coal seam gas drainage should be less than 70% of the gas content before drainage; according to the coal seam gas content X and coal seam gas Pressure p formula for industrial applications (a is a coefficient) draws: At this moment, the residual gas pressure is 49% of the original gas pressure, i.e. the gas pressure

[0021] The drop is about half;

[0022] 2. Select a place in the underground that is not affected by faults and has relatively complete rock mass protection and no cracks. Before the construction of observation hole 2, the position of drainage hole 1 is reserved in advance, and then construction of observation hole 2, observation hole 2 and drainage Holes 1 are distribu...

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Abstract

The invention provides a coal bed gas drainage effective radius measuring method, relating to designing of spacing of wells for coal bed gas drainage and adapting to occasions of water power slit drainage, intensive hole stripping drainage, hydrofracturing drainage, hydraulic holing drainage, and coal bed gas drainage with enhanced drainage of protection layer mining. According to the correspondence of coal bed gas pressure and gas content, the effective radius of the coal bed gas drainage is determined by utilizing the gas pressure change conditions so as to direct the implementation of the effective radius determination of the coal bed gas drainage. An observing hole is constructed on a design point as required, then is sealed and is provided with a pressure gage; When the pressure is stable, a drainage hole is constructed and networked for drainage, the pressure changing condition of gas at the observing hole is observed and well recorded so as to obtain the effective radius of the coal bed gas drainage corresponding to the specific drainage time, thus laying a foundation for designing a drainage scheme and achieving the purpose of safe and efficient production.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage, in particular to a coal seam gas that is suitable for hydraulic slit drainage, intensive drilling drainage, hydraulic fracturing drainage, hydraulic punching drainage, mining protective layer enhanced drainage, etc. Method for measuring the effective radius of extraction. Background technique [0002] At present, the vast majority of coal mines in my country are high-gas or outburst mines, and gas accidents are the "bottleneck" factors that restrict the safe production of coal mines. Gas pressure is the driving force of gas flow in coal seam, and it is the main parameter to calculate the gas content of coal seam and the potential of gas dynamic phenomenon. Gas pressure plays an important role in the development and occurrence of coal and gas outburst. Coal mine gas drainage is an important measure to reduce mine gas pressure and prevent gas explosion and coal and gas outburst disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/08E21F7/00G01B13/08
Inventor 林柏泉刘三钧郝志勇李全贵孟杰
Owner CHINA UNIV OF MINING & TECH
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