Multiple level methane drainage method
US4611855A · kind A · utility
81Cited by
10References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1984 |
| Grant date | Sep 16, 1986 |
| Priority date | — |
| Expiry date | May 11, 2004 |
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 a shaft from the earth's surface to a depth sufficient to intersect a plurality of seams containing gas to be collected, excavating a cruciform shaped working area at the selected seams with each of the cruciform shaped 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.