Solids free gellable treatment fluids
AssigneeHalliburton Energy Services, Inc.
InventorPubudu H Gamage
Life of this patent
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Abstract
Gellable treatment fluids containing an amps-acrylamide bipolymer and a suitable surfactant 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. The gellable treatment fluids are thermally-stable, solids-free self-degrading treatment fluid compositions useful in fluid loss pill, kill pill, perforation pill and other gel treatment applications.
Claims16
A treatment fluid for a subterranean formation comprising:
- an aqueous carrier fluid;
- a crosslinking agent;
- an amps-acrylamide bipolymer;
- and
- a gel stabilizer comprising a first stabilizer selected from the group consisting of ascorbic acid, erythorbic acid, any salt thereof, any derivative thereof and combinations thereof, a second stabilizer selected from the group consisting of alkylhydroxylamines and combinations thereof, and a third stabilizer selected from the group consisting of sulfite salts and combinations thereof.
A process for formulating a kill pill for a subterranean formation, said process comprising:
- adding an amps-acrylamide bipolymer to an aqueous carrier fluid while mixing to produce a first mixture, wherein said amps-acrylamide bipolymer consists essentially of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide monomer units;
- adjusting the pH of said first mixture to from 2 to 4 to produce a pH adjusted mixture;
- mixing in a crosslinking agent to said pH adjusted mixture to produce a second mixture;
- and
- mixing into said second mixture a gel stabilizer comprising a first stabilizer selected from the group consisting of ascorbic acid, erythorbic acid, any salt thereof, any derivative thereof and combinations thereof, a second stabilizer selected from the group consisting of alkylhydroxylamines and combinations thereof, and a third stabilizer selected from the group consisting of sulfite salts and combinations thereof.
A method of treating a subterranean formation, said method comprising:
- providing a treatment fluid comprising an aqueous carrier fluid, a crosslinking agent, an amps-acrylamide bipolymer, and a gel stabilizer, wherein said amps-acrylamide bipolymer consists essentially of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide monomer units, and wherein said gel stabilizer comprises a first stabilizer selected from the group consisting of ascorbic acid, erythorbic acid, any salt thereof, any derivative thereof and combinations thereof, a second stabilizer selected from the group consisting of alkylhydroxylamines and combinations thereof, and a third stabilizer selected from the group consisting of sulfite salts and combinations thereof;
- introducing said treatment fluid into a subterranean formation;
- allowing said treatment fluid to form a gel in said subterranean formation;
- and
- breaking said gel after it has been in said subterranean formation for at least about one day.
Dependencies are inferred from the claim text.