COMPOSITION FOR PREPARATION OF ACID STRUCTURE WITH VARYING CHANGING VISCOSITY FOR PRODUCTIVE FORMATION TREATMENT AND ACID COMPOSITION WITH VARYING VISCOSITY FOR PRODUCTIVE FORMATION TREATMENT Russian patent published in 2015 - IPC C09K8/52 C09K8/74 

FIELD: oil-and-gas industry.

SUBSTANCE: acid composition with varying viscosity for the productive formation treatment contains an surface-active agent SAA1 of amide amine oxide with the generalised formula: where R1 - an non-branched or branched chain of saturated or non-saturated aliphatic group with a number of carbon atoms from about 7 to about 30; R2 - an non-branched or branched chain of saturated or non-saturated bivalent alkylengroup with a number of carbon atoms from 2 to 6; R3 and R4 - identical or different value, they represent alkyl or hydroxyalkyl with a number of carbon atoms from 1 to about 4, or R3 and R4, together with the nitrogen atom to which they are linked, they form heterocycle containing up to six terms; R5 - hydrogen, either alkyl, or hydroxyalkyl group with a number of carbon atoms from 1 to 4, and SSA2 - an amine oxide with the generalised formula: where R3 and R4 - identical or different, represent alkyl or hydroxyalkylite with the number of carbon atoms from 1 to about 4, or R3 and R4, together with nitrogen atom to which they are linked, they form the heterocycle containing to six terms; R6 - cocoalkyl-fraction of residues of fatty acids (C10-C16), meanwhile SAA2 use in composition with PAV1 at a mass ratio (in terms of active ingredient for both SAA) as 1: (3.3-20) respectively, at the contents in acid composition of the named ratio from SAA2 and SAA1 1-2 wt % and solution of hydrochloric acid (in terms of HCl) 6-14 wt % to the total weight of the composition.

EFFECT: achieving of minimum initial viscosity of the acid composition at the minimum effect on rheological behaviour of the acid composition at acid depletion.

3 cl, 1 tbl, 1 ex, 4 dwg