ACID COMPOSITION FOR TREATMENT OF BOTTOMHOLE FORMATION ZONE (VERSIONS) Russian patent published in 2017 - IPC C09K8/78 

FIELD: oil and gas industry, chemistry.

SUBSTANCE: group of inventions relates to oil industry. In the first embodiment the acidic composition for treatment of bottomhole formation zone comprises, % wt.: sulfamic acid 5.0-15.0;. nonionic surfactant 0.05-1.5; ammonium acetate 1.0-6.0; water with the salinity less than 1 g/dm³ the rest. In the second embodiment the acidic composition for treatment of bottomhole formation zone comprises, % wt.: sulfamic acid 5,0-15,0;. nonionic surfactant 0.05-1.5; bioploymer 0.01-0.3; ammonium acetate 1.0-6.0; water with the salinity less than 1 g/dm³ the rest. In the third embodiment the acidic composition for treatment of bottomhole formation zone comprises, % wt.: sulfamic acid 5.0-15.0;. nonionic surfactant 0.05-1.5; ammonium acetate 1.0-6.0; anionic surfactant 0.01-0.5; water with the salinity less than 1 g/dm³ the rest. In the forth embodiment the acidic composition for treatment of bottomhole formation zone comprises, % wt.: sulfamic acid 5.0-15.0;. nonionic surfactant 0.05-1.5; biopolymer 0.01-0.3; ammonium acetate 1.0-6.0; anionic surfactant 0.01-0.5; water with the salinity less than 1 g/dm³ the rest.

EFFECT: improved efficiency of formation stimulation by eliminating the contamination of bottomhole formation zone by secondary sediments due to stabilization of the ferric ions, improved penetration ability of acid composition by reducing of interfacial tension at the oil interface, increased current oil recovery.

4 cl, 1 dwg, 1 tbl, 3 ex