Alkaline water flooding with a precipitation inhibitor for enhanced oil recovery
US4714113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1986 |
| Grant date | Dec 22, 1987 |
| Priority date | — |
| Expiry date | Dec 5, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/58
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An enhanced oil recovery method is provided utilizing an alkaline waterflood injection fluid including a water-soluble precipitation inhibitor such as a polyacrylate, an acrylate-containing copolymer, an organophosphonate, a carboxylate-containing organophosphonate or a polymaleic anhydride whereby divalent metal cations dissolved within the injection fluid or within the reservoir water in the immediate vicinity of the injection well are substantially prevented from precipitating. Additionally, the injection fluid preferably provides sufficient alkaline material whereby beyond the immediate vicinity of the injection well the permeability characteristics of the reservoir are modified by precipitation of, e.g., divalent metal hydroxides or divalent metal carbonates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.