A Method for Determining Effective Drainage Radius of Borehole
A technology for determining the extraction radius and determination method, which is applied in the direction of earthwork drilling, extraction fluid, wellbore/well components, etc., and can solve problems such as high failure rate and long measurement period
Active Publication Date: 2022-06-07
NAT ENG RES CENT FOR GAS CONTROLLING OF PINGAN MINE +3
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Problems solved by technology
[0005] The invention provides a method for determining the effective drainage radius of a borehole, which solves the problems of long measurement period and high failure rate in the prior art when measuring coal seam gas pressure
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[0062] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all of 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 fall within the protection scope of the present invention. .
[0063] figure 1 is a schematic flowchart of the method for determining the effective drainage radius of a borehole provided by the embodiment of the present invention, figure 2 It is a schematic plan view of the flow observation hole and the auxiliary drainage hole when drilling along the layer provided by the embodiment of the p...
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The invention provides a method for determining the effective extraction radius of boreholes, which includes: forming multiple sets of boreholes on the area of the coal seam to be measured, each set of boreholes including a flow rate observation hole and a plurality of auxiliary extraction holes, each set of boreholes The center of the flow observation hole and the centers of multiple auxiliary drainage holes are arranged at equal intervals; the flow observation hole and the auxiliary drainage holes are connected with the gas drainage device; When the total amount of gas extraction on the N-1 day is less than the total amount of gas extraction in the coal seam area to be tested, when the total amount of gas extraction on the Nth day is greater than or equal to the amount of gas extraction in the coal seam area to be tested When the total amount of gas is drained, stop the gas drainage, and determine that the effective drainage radius corresponding to the group of boreholes on the N day is 1 / 2d. The method for determining the effective drainage radius of the boreholes provided by the present invention solves the problem of It solves the problems of long measurement period and high failure rate when measuring coal seam gas pressure in the prior art.
Description
technical field [0001] The invention relates to the technical field of coal mine gas drainage, in particular to a method for determining the effective drainage radius of a borehole. Background technique [0002] Coal mine gas is one of the main disasters affecting mine safety production. It has seriously threatened the life safety of miners for a long time. With the research of various new gas prevention theories, coal mine gas disaster accidents have also been significantly improved. However, in recent years, with the With the continuous increase of coal mine excavation depth and the continuous expansion of mining scale, the difficulty of coal mine gas prevention and control is also becoming more and more difficult. The method of gas extraction in the target coal seam area is the most commonly used gas control measure at present. When drilling the target coal seam area, the effective extraction radius of the drill hole is used as the main basis for the design of the drill h...
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IPC IPC(8): E21B43/00E21B43/30E21B47/08
CPCE21B43/006E21B43/30E21B47/08
Inventor 王永韩柏青薛生刘红星周言安常先隐刘厚富岳喜占汪有清杨洋李尧斌李虎汤孟庆王涛童校长郑春山
Owner NAT ENG RES CENT FOR GAS CONTROLLING OF PINGAN MINE