Chemically induced permeability enhancement of subterranean coal formation
US5865248A · kind A · utility
9Cited by
41References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Apr 30, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/2605
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for increasing the permeability to methane of a subterranean coal formation by chemically stimulating the coal formation by injecting a gaseous oxidant into the coal formation and thereafter producing methane from the coal formation at an increased rate. The gaseous oxidant is ozone, oxygen or combinations thereof. The completion of wells penetrating a subterranean coal formation is facilitated by injecting a gaseous oxidant into the coal formation surrounding the well prior to forming a cavity in the coal formation around the well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.