In situ gasification of coal by gas fracturing
Patent
·
OSTI ID:4366588
Two or more wells are drilled into a coal seam. The wells are completed so as to isolate all other strata from the coal seam and a radially extended horizontal fracture is directed by introduction of a first combustion supporting gas under hydraulic pressure so as to connect the wells communitively. A horizontally and vertically directed fracture network is formed within the coal system by ignition of the first combustion supporting gas. A second combustion supporting gas is subsequently injected through at least one well to form a combustion front that may be propagated through the fracture network to produce combustible gases and coal tar liquids. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-015049
- Assignee:
- to Cities Service Oil Co.
- Patent Number(s):
- US 3775073
- OSTI ID:
- 4366588
- Country of Publication:
- United States
- Language:
- English
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