Multiple level methane drainage shaft method
US4452489A · kind A · utility
5Cited by
16References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Sep 20, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F7/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for collecting methane gas from subterranean formations having a plurality of spaced-apart coal seams containing methane gas includes the steps of drilling at least one shaft from the earth's surface to a depth sufficient to intersect a plurality of seams containing gas to be collected, excavating a working area at selected seams with each of the working areas communicating with the shaft, and drilling a plurality of boreholes from each of the working areas into the seams and collecting methane gas from the boreholes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.