Coalbed methane drilling
US5411104A · kind A · utility
359Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1994 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Feb 16, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system for drilling low rate coalbed formations wherein the formation has anisotropic fracture characteristics which create low permeability (high volatile B bituminous rank or lower). Typically these coalbeds have vitrinite reflectance less than 0.78 R.sub.o. The system includes drilling and completing these formation with a horizontal borehole that is drilled with a gas turbine in an underbalanced pressure condition relative to the pressure of the formation. The horizontal borehole is drilled substantially transverse to the general direction of face cleats within the coalbed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.