METHOD OF INTRASEAM GAS RECOVERY FROM COAL SEAMS

摘要

FIELD: intraseam gas recovery from coal seams. SUBSTANCE: method includes formation of ways in coal for gas passage by opening of gas coal structure by gases and/or fluids supplied under pressure through hole drilled inside coal seam. Then, for gas recovery, pressure is built-up in drilled hole with value less than corresponding measured desorption pressure. For opening of coal seam, built-up in drilled hole for period of time lasting from one day to several days or weeks is pressure facilitating opening of present in coal seam system of fissures from macropores up to microporous structure. Value of built-up pressure is taken less than minimal main stress measured in coal seam horizon designed for gas recovery. Value of built-up pressure in drilled hole is varied by cycles during the time assigned for seam opening. EFFECT: higher efficiency of method due to increased gas production rate of gas-bearing hole. 7 cl