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US 7,036,585 B2Granted
Aqueous viscoelastic fluid
AssigneeSchlumberger Technology Corporation
InventorsJian Zhou, Trevor Hughes
Life of this patent
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Abstract
The invention concerns an aqueous viscoelastic fluid for use in the recovery of hydrocarbons. According to the invention this fluid comprises a first viscoelastic surfactant and a second surfactant able to decompose under downhole conditions to release a compound itself able to reduce the viscosity of the aqueous viscoelastic fluid.
Claims21
Aqueous viscoelastic fluid for use in the recovery of hydrocarbons, comprising:
- a first surfactant, said surfactant being viscoelastic;
- a second surfactant, said second surfactant being able to decompose under downhole conditions to release a compound, said compound being able to reduce the viscosity of the aqueous viscoelastic fluid.
Method for use in the recovery of hydrocarbons comprising the following steps:
- providing an aqueous viscoelastic fluid comprising a first surfactant, said first surfactant being viscoelastic, and a second surfactant able to decompose under downhole conditions;
- allowing said second surfactant to decompose under downhole conditions to release a compound able to reduce the viscosity of the aqueous viscoelastic fluid;
- and
- allowing the viscosity of the fluid to be reduced downhole.
1 more element
Dependencies are inferred from the claim text.