E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/39
E21B 43/24 (2006.01) E21B 43/247 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1225928
METHOD OF UNDERGROUND GASIFICATION OF A SERIES OF GENTLY DIPPING AND INCLINED COAL SEAMS Abstract A method of underground gasification of a series of gently dipping and inclined coal seams comprises the steps of determining the depth of occurrence and the thickness of each coal seam in said series thereof, opening the seams by drilling operating wells, inter- connecting them within the given seam, setting the coal afire, and gasifying the seams. A safe mining depth is determined for each coal seam in the series and said series of the seams is gasified upwards when a rock thickness therebetween exceeds a safe mining depth for the underlying seam and downwards when the rock thickness therebetween exceeds said safe depth, a firing boundary of the underlying seam being shifted towards a coal pillar by an amount equal to or greater than a first spacing of rock caving in the roof of a gasified layer.
468621
Kapralov Valery K.
Kazak Vadim N.
Volk Alfei F.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Vsesojuzny Nauchno-Issledovatelsky Institut Ispolzovania Gaza V. Nefteproduktov I. Szhizhennykh Gazov "vnii-Promgaz"
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