Abstract: Disclosed is a method of opening carbon-bearing beds with production wells for underground gasification wherein a production well is drilled until the top of a bed is opened up. As soon as the drilling tool enters the upper layer of the bed, the drilling is ceased and the depths of both the top and bottom of the bed are determined. Next, the drilling is resumed so as to leave a pillar of the bed at a depth where the possibility of communication between the adjacent wells by means of a fluid is assured through the bulk of the bed. On fitting a string of casing pipes in the well, the drilling of the pillar left between the shoe of the casing pipe string and the bottom of the bed goes on.Unlike the known methods, the method disclosed assures the possibility of drilling production wells in a single run without unnecessary lowering and lifting operations, and also enables an increase in the spacing of production wells, reducing at the same time the consumption of fluid per well sunk.

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