Viscoelastic composition with improved stability
US9080095B2 · kind B2 · utility
3Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2009 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Nov 8, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/584
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method for the enhanced recovery of oil from an underground formation, in which a viscoelastic aqueous fluid comprising at least one viscosifying zwitterionic surfactant is injected into the said formation and the said fluid is conducted through this formation in order to displace the oil from the formation and to recover it via a different point from that where the viscoelastic aqueous fluid was introduced, characterized in that the said fluid exhibits an amount of a base sufficient to bring its pH to a value of greater than 10, preferably of between approximately 11 and 13.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.