Back to results
US 8,418,761 B2Granted
Stimuli-responsive high viscosity pill
AssigneeHalliburton Energy Services, Inc.
InventorsRyan van Zanten, Ryan G. Ezell
Life of this patent
Estimating the term…
Abstract
A method comprises providing a treatment fluid having a first viscosity comprising an aqueous base fluid; a viscoelastic surfactant; and a stimuli-responsive water-soluble polymer; introducing the treatment fluid into a subterranean formation; and allowing the treatment fluid viscosity to change to a second viscosity in response to a stimulus.
Claims23
A method comprising:
- providing a treatment fluid having a first viscosity comprising:
- an aqueous base fluid;
- a viscoelastic surfactant;
- and
- a stimuli-responsive water-soluble polymer that comprises a hydrophobically modified polymer that comprises a backbone polymer comprising at least one selected from the group consisting of vinylpyrrolidone, vinylpyridine, polyvinylpyrrolidone, polyvinylpyridine, polybutylene succinate, polybutylene succinate-co-adipate, polyhydroxybutyrate-valerate, polyhydroxybutyrate-covalerate, polyethylene terephthalate, sulfonated polyethylene terephthalate, polypropylene, a protein, polylactic acid, poly(glycolide), poly(ε-caprolactone), poly(hydroxy ester ether), poly(hydroxybutyrate), polycarbonate, a poly(amino acid), poly(phosphazene), polyester amide, polystyrene, any derivative thereof, any copolymer thereof, any homopolymer thereof, any terpolymer thereof, and any combination thereof;
- introducing the treatment fluid into a subterranean formation;
- and
- allowing the treatment fluid viscosity to change to a second viscosity in response to a stimulus.
5 more elements
A method comprising:
- providing a treatment fluid having a first viscosity and comprising:
- an aqueous base fluid;
- a viscoelastic surfactant;
- and
- a stimuli-responsive water soluble polymer that comprises a hydrophobically modified polymer that comprises a backbone polymer comprising at least one selected from the group consisting of vinylpyrrolidone, vinylpyridine, polyvinylpyrrolidone, polyvinylpyridine, polybutylene succinate, polybutylene succinate-co-adipate, polyhydroxybutyrate-valerate, polyhydroxybutyrate-covalerate, polyethylene terephthalate, sulfonated polyethylene terephthalate, polypropylene, a protein, polylactic acid, poly(glycolide), poly(ε-caprolactone), poly(hydroxy ester ether), poly(hydroxybutyrate), polycarbonate, a poly(amino acid), poly(phosphazene), polyester amide, polystyrene, any derivative thereof, any copolymer thereof, any homopolymer thereof, any terpolymer thereof, and any combination thereof;
- introducing the treatment fluid into a subterranean formation comprising a wellbore;
- forming a perforation in the wellbore in the presence of the treatment fluid;
- and
- allowing the treatment fluid viscosity to change in response to a stimulus.
6 more elements
A method comprising:
- providing a treatment fluid having a first viscosity comprising:
- an aqueous base fluid;
- a viscoelastic surfactant;
- and
- a stimuli-responsive water-soluble polymer that comprises a hydrophobically modified polymer that comprises an acid-releasing degradable group and a degradable group, the acid-releasing degradable group comprising at least one selected from the group consisting of an ortho ether, a poly(ortho ether), a lactide, a poly(lactide), a glycolide, a poly(glycolide), a lactone, a poly(ε-caprolactone), a poly(hydroxybutyrate), a poly(amino acid), any derivative thereof, and any combination thereof, and the degradable group comprising at least one selected from the group consisting of an amide, an acetal, a ketal, an orthoester, a carbonate, an anhydride, a silyl ether, an alkene oxide, an ether, an imine, a carbonate urethane, an amino acid, any derivative thereof, and any combination thereof;
- introducing the treatment fluid into a subterranean formation;
- and
- allowing the treatment fluid viscosity to change to a second viscosity in response to a stimulus.
5 more elements
Dependencies are inferred from the claim text.