Surfactant waterflood method for the recovery of oil
US4276933A · kind A · utility
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10References
10Claims
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Key dates
| Filing date | Dec 10, 1979 |
| Grant date | Jul 7, 1981 |
| Priority date | — |
| Expiry date | Dec 10, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/40
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved surfactant waterflood method for the recovery of oil from a subterranean reservoir utilizing an anionic surface-active agent wherein an aqueous postflush slug containing a nonionic solubilizer is employed to minimize retention of the surface-active agent in the reservoir matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.