METHOD FOR FINISHING A METHANE-COAL WELL Russian patent published in 2006 - IPC E21B43/00 

FIELD: mining industry, namely, finishing stage of construction of methane-coal wells.

SUBSTANCE: in accordance to method, productive bed is opened a second time. Well borehole is washed when second opening is finished. Hydro-disruption of productive bed is performed. Well borehole is washed after hydro-disruption. Lifting column is lowered into well borehole containing underground equipment and down-pump. Well mouth is pressurized and well is finalized by lowering level of liquid in borehole by means of down-pump. Second opening of productive bed is realized by cutting away a part of product column and cement ring behind it, positioned oppositely to product bed. After finishing second opening of productive bed, performed serially are operations concerning expansion of open well borehole in productive bed, creation of two vertical slits in it, directed towards maximal mountain stress in productive bed. Filter is mounted inside the operation column after finishing washing of well borehole after second opening of productive bed.

EFFECT: increased efficiency of finishing process for methane-coal well due to improved conditions of hydro-disruption and significant decrease of mudding degree in face-adjacent zone of productive bed.