FIELD: oil producing industry; applicable in increase of oil recovery from formations, particularly, from nonuniform formations at late stage of deposit operation. SUBSTANCE: reagent for increase of oil recovery from producing formations is based on lignin and contains the following amounts of components, wt.p.p.: hydrolytic lignin 4; sulfonol 1. EFFECT: higher quality of reagent due to improved its main process parameters including reduced interphase tension on boundary with hydrocarbons, adsorption by rocks, increased washing-off abilities with simultaneous increase of formations coverage by reagent stimulation. 1 dwg, 2 tbl
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