Process for improving the gas sweeping of an oil formation, using foams mainly containing surfactants with perfluoric groups
US4836281A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 20, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Jan 20, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/518
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention concerns an enhanced oil recovery process improving the gas sweeping of an oil formation reservoir comprising at least one injection, through at least one injection well, either simultaneously or separately, of a plug of solution, preferably aqueous, of at least one surfactant and of a gas and/or steam plug (or "slug"), so as to form a foam. At least a portion of said reservoir is swept by said foam and the hydrocarbons are recovered through at least one producing well. The surfactant complies with the general formula R.sub.F --Y--X wherein R.sub.F is a perfluoric carbon radical, Y is a single bond or a divalent carbon radical containing at least one oxygen, sulfur and/or nitrogen atom, and X is a hydrophilic group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.