Cavity induced stimulation of coal degasification wells using foam
US5474129A · kind A · utility
7Cited by
9References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Nov 7, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/2605
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved method for stimulating coal degasification wells comprising the injection of a foam into a coal seam which contains natural or induced fractures. Thereafter, high pressure gas is injected into the coal seam and suddenly released to cause disintegration of coal surrounding the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.