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SYNERGETIC EFFECT OF AUXILIARY SURFACTANTS WITH RESPECT TO RHEOLOGICAL CHARACTERISTICS OF LIQUIDS FOR DRILLING, WELL COMPLETION/FORMATION OPENING AND FORMATION HYDRAULIC FRACTURING
SYNERGETIC EFFECT OF AUXILIARY SURFACTANTS WITH RESPECT TO RHEOLOGICAL CHARACTERISTICS OF LIQUIDS FOR DRILLING, WELL COMPLETION/FORMATION OPENING AND FORMATION HYDRAULIC FRACTURING
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机译：辅助表面活性剂对钻井液，完井/地层开裂和地层水力压裂液的流变特性的协同作用
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FIELD: oil and gas industry.;SUBSTANCE: group of inventions relates to liquids based on viscoelastic surfactants and methods of use thereof in oil deposits. Viscoelastic liquid for use in the liquid composition for stimulation of the well contains at least one viscoelastic surfactant and at least one auxiliary surfactant, having synergetic action. Said viscoelastic surfactant is an amphoteric surfactant of general formula (I): (I), where R1 is a saturated or unsaturated hydrocarbon group having from 17 to 29 carbon atoms, R2 and R3 each is independently selected from an alkyl or hydroxyalkyl group with a straight or branched chain, having from 1 to 6 carbon atoms, R4 is selected from H, hydroxyl, alkyl or hydroxyalkyl groups having 1 to 4 carbon atoms; k is integer from 2 to 20 and n is integer from 0 to 20, m is integer from 1 to 20. Said auxiliary surfactant, having synergetic action has general structure (II) (II), where R1 is a saturated or unsaturated hydrocarbon group having from 12 to 22 carbon atoms, R2, R3 and R4 each is independently selected from an alkyl or hydroxyalkyl group with a unbranched or branched chain, having from 1 to 4 carbon atoms; and from hydroxyl group. Viscoelastic liquid has density of more than 1.2 kg/l.;EFFECT: improved viscosity in high-density brines at high temperatures of more than 300 °F.;21 cl, 11 dwg, 2 tbl, 11 ex
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