METHOD FOR DEGASSING OF COAL BEDS Russian patent published in 2012 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method consists in guiding the deviated horizontal/vertically horizontal wells from the ground surface with output of their downhole part to horizontal plane, provision the wells with pipe casing, connection to the vacuum pump and methane recovery from unworked coal. On the mine field a series of above-ground wells are guided with output of their horizontal portions into the working and superimposed coal seams. In addition to the above-ground wells, the short isolated from mine weather underground wells are designed and equipped, by means of those the hydraulic connection between above-ground well and underground ones is made with the capability of borehole fluid discharge. In preparation of excavation site for upwall development, the horizontal portion of above-ground well is guided along the axis of excavation site, and in preparation of excavation site for along-strike development - arriswise the lengthwise extended section of degassed reservoir, with minus angle of elevation of horizontal well portion. In the expanded excavation site a counter on-shore well is guided with placing its horizontal portion in the tapped coal seam.

EFFECT: gain in performance of gas drainage from the working and superimposed seams.

4 cl, 2 dwg