Enhanced oil recovery by polymer without supplementary equipment or product
US8230922B2 · kind B2 · utility
14Cited by
11References
13Claims
0Family size
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Key dates
| Filing date | Jun 17, 2011 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Jun 17, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for enhanced oil recovery in an oil-bearing formation having high permeability zones, constituting preferential passages for the injected liquid, involves blocking the preferential passages by injecting into the formation an aqueous solution based on water soluble polymers at a concentration such that the viscosity of the aqueous solution is higher than the viscosity of the oil. Once the blocking step is completed, an aqueous solution is injected having an identical composition to that used in the blocking step, but at a lower polymer concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.