FIELD: acid treatment of underground productive formation.
SUBSTANCE: multiphase aqueous composition for use in treating a subterranean formation for intensifying production of fluids, comprising: a surfactant, a first phase containing water, an acid and a water-soluble acid retarding agent, and a second phase selected from the group, consisting of an immiscible organic phase, gas and combinations thereof, wherein said surfactant is a cationic surfactant of structure [RNXYZ]+ A−, where R is an alkyl chain containing 10–18 carbon atoms. X, Y and Z are selected from methyl, ethyl, hydroxyethyl or benzyl, where X, Y and Z can be identical or different; and A is an anion selected from the group consisting of fluoride, chloride, bromide, iodide, acetate, sulphate, alkyl sulphonate or aryl sulphonate. Method of treating a subterranean formation to intensify production of fluids, comprising: providing said multiphase aqueous composition and b) treating an underground formation, fluidly connected to the well borehole, an oil treatment fluid containing said multiphase aqueous composition. Method of treating a subterranean formation for intensifying production of fluids, involving: a) treating a subterranean formation fluidly connected to a wellbore, an oil treatment fluid, containing said multi-phase aqueous composition containing said surfactant, including a foaming agent, a first phase containing water, acid and a water-soluble acid retarding agent, a second phase comprising a gas selected from a group consisting of nitrogen, carbon dioxide, oxygen, helium, argon, hydrogen, methane or ethane, or a combination thereof, wherein said multiphase aqueous composition is in form of a foam.
EFFECT: technical result is providing increase in depth of fractures of hydraulic fracturing and/or acid treatment of rocks.
24 cl, 3 tbl, 9 dwg
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