METHOD FOR DEGASSING COAL-ROCK MASSIF

摘要

A method for degassing coal-rock massif includes suction of gas mix from coal-rock massif surrounding the well through gas-suction pipes. Between the ends of the main and supplementary suction pipes one forms with operating simultaneously main and supplementary vacuum pumps rarefaction difference, this depends on level of rarefaction in supplementary suction pipe and separates the well into two varying in length zones with different content of methane.