Rheology enhancers in non-oilfield applications
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United States of America Patent
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Issued Date -
Oct 18, 2007
app pub date -
Apr 13, 2006
filing date -
Apr 13, 2006
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Abandoned
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Abstract
A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol--polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain non-oilfield excavation applications, for example boring, excavating, drilling and trenching operations in deep foundation construction, subterranean construction, and tunneling. Preferred surfactants are betaines and quaternary amines.
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