US 12,247,156 B2
Re-crosslinkable particle for conformance control and temporary plugging
Yifu Long, Rolla, MO (US); Bowen Yu, Rolla, MO (US); Baojun Bai, Rolla, MO (US); and Thomas Schuman, Rolla, MO (US)
Assigned to The Curators of the University of Missouri, Columbia, MO (US)
Appl. No. 17/791,619
Filed by The Curators of the University of Missouri, Columbia, MO (US)
PCT Filed Jan. 10, 2020, PCT No. PCT/US2020/013094
§ 371(c)(1), (2) Date Jul. 8, 2022,
PCT Pub. No. WO2021/141598, PCT Pub. Date Jul. 15, 2021.
Prior Publication US 2023/0055352 A1, Feb. 23, 2023
Int. Cl. C09K 8/514 (2006.01); C09K 8/42 (2006.01)
CPC C09K 8/426 (2013.01) 25 Claims
 
1. A swellable composition for controlling fluid flow, said swellable composition comprising a polymer matrix comprising:
polymer chains crosslinked by a crosslinking agent, said polymer chains including:
a first monomer selected from the group consisting of acrylamide, methacrylamide, N-methylacrylamide, N-tert-butylacrylamide, N-ethylacrylamide, N-hydroxyethyl acrylamide, N-isopropylacrylamide, N, N-diethylacrylamide, dimethylaminopropyl acrylamide, dimethylaminopropyl methacrylamide, N,N-dimethylacrylamide, and N-vinyl formamide; and
a second monomer selected from the group consisting of sulfonates, sulfates, phosphates, and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt; and
a re-crosslinking agent embedded within the polymer matrix and chosen from an aminated alginate, chitosan, aminated chitosan, a dextran amine, aminated cellulose, aminated guaran, or complexes thereof with a multivalent metal ion.