Apparatus and methods for completing subterranean wells
US8701766B2 · kind B2 · utility
3Cited by
8References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 2011 |
| Grant date | Apr 22, 2014 |
| Priority date | — |
| Expiry date | Jul 11, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00706
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The external surface of a tubular body such as well casing is coated with a substance that, upon exposure to cement, is unstable and degrades. After installation in a subterranean well and subsequent cementation, the coating degrades and forms a gap between the external surface of the tubular body and the cement sheath. Forming the gap is useful for obtaining optimal stimulation during the hydraulic fracturing of unconventional shale-gas formations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.