Underground gasification of bituminous coal
US4299285A · kind A · utility
280Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1980 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Jul 21, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S48/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In the underground gasification of a swelling coal the high gas-flow link between the injection and the production wells is produced by introducing hot air into the injection well at a pressure sufficient to fracture the coal. The bulk permeability of the coal proximate to the link is increased and the plugging of the link during the subsequent in situ combustion and gasification procedure is suppressed by continuing the injection of the hot air, heated to a temperature below the softening point of the coal, into the injection well, through the link to the production well without combustion of the coal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.