Poly(alkyenylamide)-polysaccharide hydrogels for treatment of subterranean formations

A method of plugging a flow pathway in a subterranean formation, the method comprising:

• obtaining or providing a composition comprising a poly(alkenylamide)-polysaccharide hydrogel;
• placing the composition in a subterranean formation, wherein the subterranean formation comprises a flow pathway;
• and
• at least partially hydrating the hydrogel, to provide a composition comprising a hydrated hydrogel sufficient to substantially plug the flow pathway.

A method of treating a subterranean formation, the method comprising:

• obtaining or providing a composition comprising a poly(alkenylamide)-polysaccharide hydrogel comprising the following structure
• -(PAA)n1-(CL)n2-(PAA-PS)n3-
• wherein PAA, CL, PAA-PS, and the repeating units of PAA, CL, and PAA-PS are in a block copolymer or random copolymer arrangement;
• wherein PAA has the structure
• wherein CL has the structure
• wherein at each occurrence PAA-PS is part of the same polysaccharide or a different polysaccharide, wherein PAA-PS has the structure
• wherein at each occurrence R16 is independently selected from the group consisting of —O−, —OH, and —O−CI+, wherein at each occurrence CI+ is independently a counterion, n1+n3 is about 10 to about 100,000, n2 is about 0 to about 10,000, and p1+p2 is about 10 to about 100,000;
• and
• placing the composition in a subterranean formation.