Well completion methods using gellable treatment fluids having long term thermal stability of the gelled state

摘要

Gellable treatment fluids containing a terpolymer that comprises 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid monomer units can be used in various subterranean operations where it is necessary for the treatment fluid to remain in a gelled state for extended periods of time at high formation temperatures. Methods for treating a subterranean formation can comprise providing a treatment fluid comprising an aqueous carrier fluid, a crosslinking agent, a gel stabilizer, and a terpolymer that comprises 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or any salt thereof; introducing the treatment fluid into a subterranean formation; allowing the treatment fluid to form a gel in the subterranean formation; and breaking the gel after it has been in the subterranean formation for at least about one day.

主权项

1. A method comprising:
providing a treatment fluid comprising an aqueous carrier fluid, a crosslinking agent, a gel stabilizer for a crosslinked gel, and a terpolymer that comprises 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and acrylic acid monomer units, or any salt thereof;
wherein the gel stabilizer comprises a hydroxylamine; introducing the treatment fluid into a subterranean formation; allowing the treatment fluid to form a gel in the subterranean formation, the gel comprising a crosslinked gel formed from a reaction between the terpolymer and the crosslinking agent; and breaking the gel after it has been in the subterranean formation for at least about one day.