Fracture stimulation of coal degasification wells
US4993491A · kind A · utility
27Cited by
11References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Apr 24, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This invention pertains to a novel method of fracturing subterranean coal formations as a means for stimulating the production of coalbed methane. A highly conductive proppant pack is emplaced in the fracture during the fracturing treatment that has a particle size gradient ranging from about 40/70 mesh at the leading tip of the fracture to about 12/20 mesh at the trailing base of the fracture. The fracturing process is conventional in the sense that the materials and equipment used in the process are well known. The manner in which such materials and equipment are used to fracture coal degasification wells is new.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.