VISCOELASTIC SURFACTANT FORMULATIONS AND USE IN SUBTERRANEAN FORMATIONS
A viscoelastic surfactant formulation may include a zwitterionic surfactant with a general formula (I):where A is a C or SO, E1 is a linear or branched, saturated or unsaturated hydrocarbon chain having 1 to 4 carbon atoms, R1 and R2 are selected from alkyl groups of from 1 to about 4 carbon atoms,...
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