COMPOSITIONS FOR IMPROVING OIL RECOVERY Russian patent published in 2020 - IPC C09K8/584 E21B43/26 B01F3/08 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: present invention relates to compositions and methods for increasing recoil of crude oil from an underground hydrocarbon-bearing formation. Disclosed is a composition for increasing recoil of crude oil from an underground hydrocarbon-containing formation, containing from about 98 to 99.999 wt. % of a water source with a high total content of dissolved solid substances and one or more of the following: 300 to 20,000 ppm Ca, from 300 to 4000 ppm of Mg or from 300 to 3000 ppm of Ba, one or more surfactants - oil phase surfactants, characterized as non-ionic and having a combined HLB of less than about 9, one or more binding agents, one or more aqueous phase surfactants which are non-ionic, soluble or dispersible in water and chemically different from one or more surfactant surfactants, one or more ionic surfactants, one or more clay stabilizers. Composition according to another embodiment, which also contains one or more soluble or dispersible in water non-ionic surfactants, one or more zwitterionic surfactants, one or more anionic surfactants and optionally one or more additional ionic surfactants. Disclosed are use of said compositions, emulsion and use thereof, methods for increasing recoil of crude oil from an underground hydrocarbon-containing formation using said compositions.

EFFECT: technical result is higher efficiency of treatment to increase output of crude oil.

19 cl, 5 dwg, 12 tbl, 13 ex