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US 11,884,881 B2Granted
Delayed gelation of polymers
AssigneesConocoPhillips Company, University of Kansas
InventorsHuili Guan, Cory Berkland, Ahmad Moradi-Araghi, Jenn-Tai Liang, Terry M. Christian, Riley B. Needham, Min Cheng
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Abstract
The disclosure is directed to methods and compositions delaying the gelation of polymers in water flooding by sequentially or co-injecting a carboxylate-containing polymer solution, a gel-delaying polymer, and gelation agent into a hydrocarbon reservoir. Delays of weeks are observed.
Claims18
A delayed gelling composition, said composition made by:
- a) sequentially combining ingredients comprising:
- i) an expandable polymeric particle in an injection fluid, said particle comprising a copolymer of about 80-98 mole percent acrylamide and about 2-20 mole % sodium acrylate;
- ii) at least one gel-delaying polymer;
- and
- iii) a crosslinker;
- b) thereby forming a delayed gelling composition without forming a separate nanogel.
3 more elements
Dependencies are inferred from the claim text.