ETHOXYLATED DESORBENTS FOR INCREASING OIL RECOVERY Russian patent published in 2019 - IPC C09K8/584 E21B43/22 

FIELD: chemistry.

SUBSTANCE: invention relates to use of at least one ethoxylated anionic surfactant selected from compounds of formula given, as an inhibitor for inhibiting phenomena of retention of anionic surfactants in an oil-bearing formation, particularly in a carbonate or clayey formation. Method for increasing oil recovery of a subterranean formation, involving use of said anionic surfactant, where introducing into said subterranean formation through at least one injection well fluid, containing at least an aqueous medium, anionic surfactant and optionally anionic co-surfactant, then fluid is injected through the same or the same injection wells, containing the anionic surfactant compound of the above formula, and extracted through at least one fluid production means, carrying oil coming out of the subterranean formation. Method for increasing oil recovery of a subterranean formation, including said application, in which an anionic surfactant and optionally an anionic co-surfactant is introduced into the above subterranean formation through at least one injection well, the fluid preferably is not containing surfactant and the above anionic surfactant, then it is removed by means of at least one fluid extracting device, bearing oil coming out of underground formation. Invention is developed in dependent items of the formula.

EFFECT: technical result is an increase in processing efficiency.

13 cl, 2 tbl