Temperature-resistant and salt-tolerant in-situ plugging enhanced gel compositions, gels, preparation methods and applications

A composition for a temperature-resistant and salt-tolerant in-situ plugging-enhanced gel, wherein the composition comprises a first monomer, a second monomer, a first crosslinking agent, a second crosslinking agent, an initiator, an enhancer, and water;

• optionally, the composition further comprises a third monomer;
• the first monomer is selected from at least one of 2-acrylamidomethyl-2-methylpropanesulfonic acid, sodium styrenesulfonate, vinylsulfonic acid, p-styrenesulfonic acid, 4-styrenesulfonic acid, methyl acrylate sulfobutyl ester, and acrylic acid hydroxypropylsulfonic acid ester;
• the second monomer is selected from at least one of N-vinylpyrrolidone, acrylic diethylenaminoethyl ester, methyl acrylate dimethylaminoethyl ester, vinyl imidazole, vinylpyridine, and acrylic hydroxyethyl ester;
• the third monomer is selected from at least one of N-isopropylacrylamide, acrylic hydroxyethyl ester, and N-(3-aminopropyl)methylacrylamide;
• the first crosslinking agent is polyethylene glycol bisacrylate;
• the second crosslinking agent is selected from a second acid-sensitive crosslinking agent and/or a second temperature-sensitive crosslinking agent;
• the second acid-sensitive crosslinking agent is selected from at least one of benzylboronic acid phenyl ether, boronic acid tributyl ester, boronic acid triethyl ester, boronic acid diglyceride, and boronic acid trimethyl ester;
• the second temperature-sensitive crosslinking agent is selected from at least one of 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, hexamethylene diisocyanate-butyrolactone end-capped compound, and bis(tri methylsilyl)amino propyl triethoxysilane;
• and
• based on a total weight of the composition, a content of the first monomer is 5 wt %-40 wt %, a content of the second monomer is 5 wt %-30 wt %, a content of the third monomer is 0 wt %-10 wt %, a content of the first crosslinking agent is 0.01 wt %-1 wt %, a content of the second crosslinking agent is 0.01 wt %-1 wt %, a content of the enhancer is 0.01 wt %-10 wt %, a content of the initiator is 0.01 wt %-1 wt %, and a remainder is the water.