Temperature-triggered viscosifier for treatment of a subterranean formation

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

• placing in a subterranean formation a composition comprising
• a crosslinkable viscosifier polymer comprising repeating units having the structure:
• wherein
• at each occurrence R1 is independently selected from the group consisting of —H and a counterion,
• the repeating units are in a block, alternate, or random configuration, and each repeating unit is independently in the orientation shown or in the opposite orientation,
• the crosslinkable viscosifier polymer has a molecular weight of about 5,000,000 g/mol to about 15,000,000 g/mol, and
• n is about 5,000 to about 75,000, z is about 2,500 to about 170,000, and m is about 0 to about 60,000;
• a crosslinker comprising at least one of zirconium and a zirconium derivative;
• and
• a downhole fluid comprising at least one of an aqueous drilling fluid and an aqueous fracturing fluid;
• wherein about 0.01 wt % about 10 wt % of the composition is the crosslinkable viscosifier polymer and the crosslinker.

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

• placing in a subterranean formation a composition comprising
• a crosslinkable viscosifier polymer comprising an ethylene repeating unit comprising a —C(O)NH2 group and an ethylene repeating unit comprising an —S(O)2OR1 group,
• wherein at each occurrence R1 is independently selected from the group consisting of —H and a counterion,
• wherein the ethylene repeating unit comprising the —C(O)NH2 group and the ethylene repeating unit comprising the —S(O)2OR1 group are in block, alternate, or random configuration;
• and
• wherein the crosslinkable viscosifier polymer comprises repeating units having the structure:
• wherein the repeating units are in a block, alternate, or random configuration, and each repeating unit is independently in the orientation shown or in the opposite orientation;
• and
• at least one crosslinker.