Process for enhanced oil recovery using the ASP technique
US8776880B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2011 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Sep 13, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/588
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the enhanced recovery of oil in a deposit introduces into the deposit an alkaline aqueous solution of a water-soluble polymer containing a surfactant. The aqueous solution of water-soluble polymer introduced is prepared with an aqueous solution initially containing Ca2+ and Mg2+ ions treated with an alkaline agent and a dispersant, so as, prior to the introduction of the polymer and the surfactant into the aqueous solution, to precipitate, under the action of the alkaline agent and of CO2 optionally dissolved in the aqueous solution, the Ca2+ and Mg2+ ions. The precipitates are especially in the form of precipitates of calcium carbonate and of magnesium hydroxide and are dispersed owing to the dispersant, which is chosen in order to limit the size of the calcium carbonate and magnesium hydroxide precipitates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.