EP 0002306 B1 19811125 - PROCESS FOR TRANSFORMATION OF COAL IN SITU, PARTICULARLY GAZIFICATION
Title (en)
PROCESS FOR TRANSFORMATION OF COAL IN SITU, PARTICULARLY GAZIFICATION
Publication
Application
Priority
NL 7713455 A 19771206
Abstract (en)
[origin: US4220203A] For the purpose of in-situ recovery of coal a borehole is driven from the surface in the plane of the coal over at least a large part of its travel, as far as conditions permit. At or near its end this borehole is widened over such a length and to such a width as corresponds with at least twice the deviation to be expected in the horizontal projection of a second borehole which is driven so far as to connect the widened section described above. The widened section is preferably made with the aid of mechanical means. After the boreholes have been linked, the coal is recovered by gasification, dissolution or extraction, whether or not under supercritical conditions and whether or not with attendant chemical/physical disintegration. The method according to the invention is particularly suited for use in the 'in-line' gasification technique.
IPC 1-7
IPC 8 full level
E21B 43/243 (2006.01); E21B 43/295 (2006.01); E21C 41/18 (2006.01)
CPC (source: EP US)
E21B 43/243 (2013.01 - EP US); E21B 43/295 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB
DOCDB simple family (publication)
EP 0002306 A1 19790613; EP 0002306 B1 19811125; DE 2861379 D1 19820128; NL 7713455 A 19790608; US 4220203 A 19800902
DOCDB simple family (application)
EP 78200341 A 19781202; DE 2861379 T 19781202; NL 7713455 A 19771206; US 96708978 A 19781206