METHOD OF COMPLEX DEGASIFICATION OF CARBON METHANE BEDS OF CARBON DEPOSITS Russian patent published in 2008 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: successively following procedures are executed through the same system of cased degasifying wells bored from surface: beforehand degasification of carbon methane beds out of undischarged massif of mine field under development, preliminary degasification out of discharged massif of mine field under development and residual degasification out of undermined massif of mine field under development. The system of degasification wells is made in form of modules, each including vertical-horizontal and vertical wells, connected to each other. Case columns of wells are fixed only before entrance to a carbon methane bed. A horizontal bore channel of the vertical-horizontal well is used for active effect to weaken the carbon methane bed on stages of beforehand and preliminary degasification. Cased bore holes of wells are successively used for extraction of stripped methane during beforehand, preliminary and residual degasification of carbon methane beds.

EFFECT: increased volume of methane extraction on stages of beforehand and preliminary degasification of carbon methane beds of carbon deposits.

9 cl, 4 dwg