Abstract: To control the process of underground gasification of a coal bed with due provisions for the natural geological and mining conditions, in the disclosed method the rate of gassing-out the coal bed is selected from the following expression: ##EQU1## WHERE W is the amount of water flowing into the gasification zone, m.sup.3 /hour;I is the amount of coal gassed out per unit of time, tons/hour (the intensity of the process);Q.sub.h.sup.r is the combustion heat of the gas, kcal/m.sup.3 ;v.sup.r is the yield of gas from 1.0 kg of coal, m.sup.3 ;Q.sub.h.sup.y is the lowest combustion heat of coal, kcal/kg;m is the thickness of the coal bed, in meters.

Abstract: The method connecting wells by hydraulic-fracturing of a mineral bed, primarily for connection of wells in underground gasification of coal beds; using hydraulic-fracturing of a bed is effected intermediate a source-well into which a liquid is pumped under pressure and a well in the required direction; the head of the well with which connection is to be effected is sealed, whereas the heads of the wells, with which connection is undesirable, are opened; the liquid is pumped into the source-well under a pressure sufficient for initiating hydraulic-fracturing; the pressure in the well with which the source-well is to be connected is measured, and the moment the pressure in this well attains the hydraulic-fracturing value, the head thereof is immediately opened; upon the formation of a hydraulic fracturing fissure, the latter is flushed with the liquid; the method provides for building up a hydraulic-fracturing pressure in the well with which connection of the source-well is to be effected and thus controlling t