Method of producing synthesis gas by underground gasification of coal using specific well configuration
US4648450A · kind A · utility
2Cited by
11References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Nov 27, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S48/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Underground coal gasification process containing a novel system of injection and production wells. Specifically, the injection well is positioned at an angle with respect to horizontal of less than the angle of repose of loose coal and char for the particular coal seam, and the production well is positioned at an angle with respect to horizontal of greater than the angle of repose but less than 90.degree.. This system protects the injection well during the process and places the production well in a position for maximum production while relieving it of certain tensile and shear stresses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.