Methods and compositions for reducing fluid loss during treatment with viscoelastic surfactant gels
AssigneeBaker Hughes Incorporated
InventorsBrian B. Beall, Richard S. Wheeler, D V Satyanarayana Gupta
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Abstract
Methods and compositions of treating formations using viscoelastic treatment fluids are provided that reduce the amount of fluid loss to the formations due to the lack of polymer backbone in the viscoelastic treatment fluids. The methods and compositions of treating formations include a fluid loss additive that includes a copolymer that includes a hydrophilic monomeric unit and a first anchoring monomeric unit.
Claims20
A method of treating a well bore comprising the steps of:
- a. providing a viscoelastic treatment fluid comprising a fluid loss additive comprising a copolymer comprising a hydrophilic monomeric unit and a first anchoring monomeric unit based upon at least one of N-vinylformamide, N,N-diallylacetamide, or a mixture thereof;
- and
- b. introducing the treatment fluid into a well bore that penetrates a subterranean formation.
A method of treating a well bore comprising the steps of:
- a. combining a viscoelastic treatment fluid that is essentially free of polymer and a fluid loss additive comprising copolymer comprising a hydrophilic monomeric unit and a first anchoring monomeric unit based upon at least one of N-vinylformamide, N,N-diallylacetamide, or a mixture thereof;
- and
- b. introducing the viscoelastic treatment fluid and the fluid loss additive into a well bore that penetrates a subterranean formation.
A viscoelastic treatment fluid comprising a viscoelastic anionic surfactant and a fluid loss additive comprising a copolymer comprising a hydrophilic monomeric unit and a first anchoring monomeric unit based upon at least one of N-vinylformamide, N,N-diallylacetamide, or a mixture thereof, the fluid loss additive being present in a range of about 0.01 gallons per 1000 gallons fracturing fluid to about 60 gallons per 1000 gallons fracturing fluid.
Dependencies are inferred from the claim text.