METHOD OF CONDITIONING OF WELL OF UNDERGROUND GAS PRODUCER Russian patent published in 2009 - IPC E21B43/295 

FIELD: mining.

SUBSTANCE: method consists in boring well composed of cased part passing through rock bearing coal bed and made in form of double metal column of internal and external pipes. Water pipeline is installed in a circular space between pipes; the pipeline is intended for supply of water to the end of the cased part of the well and for cooling withdrawn hot gas through its internal pipe. The well has an uncased part driven through a coal bed. The water pipeline is ended either near boundaries of contact with the coal bed in rock of the roof of the coal bed or in rock of the floor of the coal bed. The internal pipe ends at the beginning zone of the coal bed. A device for control over a heat source location in the gas withdrawing well in installed in the lower end of the internal pipe. The uncased part of the gas withdrawing well is heat treated by means of controlled counter flow displacement of the heat source along a bored channel towards air blow pumped into the gas withdrawing well. Position of the heat source in the gas withdrawing well is controlled and upon recording its movement to the lower end of the internal pipe, formation of the underground separator capacity is commenced; this is achieved by increasing amount of pumped air blow for de-gassing coal under the lower end of the internal pipe. Amount of pumped air blow in the process of forming the capacity of the underground separator is determined from a mathematical expression.

EFFECT: upgraded reliability and intensiveness of withdrawal of gas purified from solid and liquid impurities.

3 cl, 1 dwg, 1 ex