PROCEDURE FOR DEGASSING GAS BEARING ORE AND COAL DEPOSITS AT DEVELOPMENT OF MINERALS Russian patent published in 2010 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: spatially oriented boreholes are drilled in degassed massif. Heads of boreholes are sealed and cased with a perforated pipe. Additional vacuum-pump aggregates are installed at each head of a borehole cluster. The aggregates perform forceful withdrawal of gas mixture to a central vacuum station. Additional facilities of gas mixture withdrawal, installed before each borehole cluster, function as a flushing aggregate during drilling. Simultaneously they loosen and dynamically affect a bottomhole zone of each borehole. By rotating the functions of line for pressurising suction the same pump aggregates operate for pumping out methane-air mixture from the cluster of boreholes.

EFFECT: increased efficiency of gas recovery of formation and of methane withdrawal, reduced gas contents in mine developments, increased safety of mining related to gas factor.

4 dwg