Determination method for effective extraction radius of drilled holes
A technology of extraction radius and determination method, which is applied in the directions of earth-moving drilling, production of fluids, wellbore/well components, etc., and can solve the problems of high failure rate and long measurement period.
Active Publication Date: 2020-09-11
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 purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work all belong to the protection scope of the present invention .
[0063] figure 1 It is a schematic flow chart of the method for determining the effective drilling radius of the 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 bedding provided by the embodiment of the present...
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The invention provides a determination method for the effective extraction radius of drilled holes. The determination method comprises the steps that multiple sets of drilled holes are formed in a to-be-measured coal seam area, each set of drilled holes comprises a flow observation hole and multiple auxiliary extraction holes, and the centers of the flow observation hole and the multiple auxiliaryextraction holes in each set of drilled holes are arranged at equal distance; the flow observation holes and the auxiliary extraction holes are connected with a gas extraction device; the gas extraction quantity of each day is determined according to parameters, monitored by the gas extraction device, of the flow observation holes; and when the total gas extraction quantity accumulated in day N-1is smaller than the total quantity of gas needing to be extracted in the to-be-measured coal seam area, and when the total gas extraction quantity accumulated in day N is larger than or equal to thetotal quantity of gas needing to be extracted in the to-be-measured coal seam area, gas extraction is stopped, and the corresponding effective extraction radius of the set of drilled holes in day N isdetermined as 1 / 2d. According to the determination method for the effective extraction radius of the drilled holes, the problems that in the prior art, when coal seam gas pressure is measured, the measuring period is long, and the failure rate is high are solved.
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 that affect mine safety production. It has seriously threatened the life safety of miners for a long time. With the research of various new theories of gas prevention and control, coal mine gas disaster accidents have also been significantly improved. However, in recent years, with the As the depth of coal mine excavation continues to increase, the scale of mining continues to expand, and the difficulty of coal mine gas prevention and control is also increasing. At present, after construction is carried out from the underground roadway space to the target coal seam area, drilling along the bedding or through the bedding The method of gas drainage in the target coal seam area is currently the most commonly used gas control me...
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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