Process for recovery of carbonaceous materials from...

Details Process for recovery of carbonaceous materials from... Process for recovery of carbonaceous materials from...

E - Fixed Constructions

21

B

166/26

E21B 43/26 (2006.01) E21B 43/24 (2006.01) E21B 43/248 (2006.01)

Patent

CA 1053572

PROCESS FOR RECOVERY OF CARBONACEOUS MATERIALS FROM SUBTERRANEAN DEPOSITS BY IN SITU PROCESSING ABSTRACT OF THE DISCLOSURE Subterranean carbonaceous deposits, such as oild shale or the like, that are located at or close to the surface, are prepared for retorting by drilling blast holes from the surface into the deposit, and blasting, creating a rubble pile that reaches the surface. The surface is sealed by suitable means, and the oil shale is retorted in place. Where a stratum of barren rock lies between the carbonaceous deposit and the surface, the blast holes are drilled and blasted in such a manner as to maximize the fragmentation of the carbonaceous deposit, and minimize the fragmentation c& the overlaying barren stratum. Where overburden conditions are not suitable for treatment by this method, the overburden is removed by strip mining methods, and the carbonaceous deposits are exposed for treatment by the method described above.

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