Low pH crosslinking of polymers
US11401455B2 · kind B2 · utility
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13Claims
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Key dates
| Filing date | Sep 12, 2021 |
| Grant date | Aug 2, 2022 |
| Priority date | — |
| Expiry date | Sep 12, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P90/70
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention is directed to polymers that self-crosslink at acidic pH or can be crosslinked by phenolic agents in brine. Such polymers have lower viscosity and can be pumped deep into reservoirs, where they will cross link in situ, thus increasing their viscosity and/or form a gel and blocking thief zones. Methods of making and using such polymers are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.