METHOD OF DETERMINING OUTBURST SITES IN COAL BEDS Russian patent published in 2014 - IPC E21F5/00 E21C39/00 

FIELD: mining.

SUBSTANCE: method of determining outburst sites in coal pits, comprising interval drilling well in the bottomhole of development opening, measuring at each interval of exit of drill cuttings and the initial rate of gas emission and determining the possibility of existence in the coal bed of solid solutions of natural gas according to the type of gas hydrates. Then in the drilled well the specific electrical resistivity of the coal bed is measured and the dependency diagram of the specific electrical resistivity of the coal bed from the distance along the well axis is made, using which the width of the site of the coal bed is determined, comprising the solid solution of natural gas according to the type of gas hydrates. Then the rate of outburst Rn is determined taking into account the width of the site of coal bed comprising the solid solution of natural gas according to the type of gas hydrates, and the natural moisture content of the coal bed. At that on the test site of the coal bed at a distance of 0.75÷1.25 m from the first well the second well is drilled. Then the velocity of elastic waves in the array between the wells is determined, for which the piezoelectric detectors are placed in both wells, which are moved with the increment of 0.15÷0.25 m simultaneously in both wells. At that the sites of the coal bed, in which the specific electrical resistivity is 50÷100 times greater than the specific electrical resistivity of the adjacent sites, contain the solid solution of natural gas according to the type of gas hydrates, if the velocity of elastic waves in them is about 2.0÷2.5 km/s.

EFFECT: increasing the reliability of determining the outburst in sites of coal beds.

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