Method for determining grid type layer-through drilling intervals of floor roadway

Abstract

The invention relates to a method for determining grid type layer-through drilling intervals of a floor roadway, which can accurately and quickly determine the effective intervals of layer-through drilling of an outburst coal seam within a certain period of time by adopting the arrangement of the determining drilling holes and determining the grid type layer-through drilling intervals, simultaneously arranging multiple groups of the determining drilling holes and adopting the determination of double indexes, namely residual gas pressure of a coal seam and residual gas content, so as to effectively reduce the gas content in the coal seam and eliminate the outburst risk by the determined layer-through drilling intervals on the one hand, and reduce the drilling engineering quantity to the greatest extent, shorten the construction period of drilling, and further ensure the balance of pumping, excavation and mining of the outburst coal seam on the other hand. The method is simple, the measurement speed is fast, and the determined results are accurate and reliable.

Description

technical field [0001] The invention relates to a method for measuring the spacing of interbed drilling holes used for extracting coal seam gas, in particular to a method for measuring the spacing of interbed drilling holes in a grid pattern of floor rock roadways suitable for coal mine production safety. Background technique [0002] According to the "Regulations on the Prevention and Control of Coal and Gas Outbursts" promulgated and implemented by the State Administration of Work Safety on August 1, 2009, gas control in outburst coal seams must follow the principle of "existing regional outburst prevention measures and supplementary local outburst prevention measures", namely For the outburst coal seam, it is necessary to adopt regional outburst prevention measures first to eliminate the outburst danger of the coal seam before the coal seam mining operation can be carried out, and the regional outburst prevention measures should be placed in the first place. At present, r...

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Problems solved by technology

[0003]1) The layout of the measured boreholes cannot truly reflect the drainage effect of the boreholes on the control area under the condition of grid-through-layer drilling, so the measurement results are inaccurate

[0004]2) Due to the heterogeneous structure of the coal seam, after the construction of the gas drainage hole, it is possible that one of the gas drainage holes will be connected with the pressure hole through the crack, resulting in pressure The pressure value of the hole drops rapidly, which cannot truly reflect the decline of residual gas in the entire drainage area. Therefore, only one index of gas pressure is used as the measurement index, and the measurement results are not reliable.

[0005] 3) Due to the use of the measurement method from far to near, the measurement time is long and cannot meet the requirements of on-site rapid measurement

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