Swellable polymer with cationic sites
US9139762B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 18, 2014 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | Apr 20, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/588
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to long lasting crosslinked water-soluble swellable polymers, methods for making same, and their uses. More particularly, the invention relates to a composition comprising expandable polymeric particles having cationic sites as well as labile crosslinkers and stable crosslinkers, said particle mixed with a fluid. A particularly important use is as an injection fluid in petroleum production, where the expandable polymeric particles are injected into a target zones in the reservoirs and when the heat and/or a suitable pH in the reservoir cause degradation of the labile crosslinker and when the particle expands, the cationic sites in the polymer adsorb to negative sites of the rock in the formation, thus diverting water to lower permeability regions and improving oil recovery. However, many other uses are possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.