FIELD: oil and gas production. SUBSTANCE: in a method of reducing loss of flooding agent on gallery matrix containing liquid hydrocarbons involving stabilization of matrix in presence of cations and treatment of matrix with adsorbent solution, the latter employs sulfites and, as cations, potassium and sodium chlorides are utilized. Method of secondary extraction of hydrocarbons contained in gallery matrix includes injecting adsorbent before or simultaneously with injecting flooding agent in presence of cations derived from potassium and sodium chlorides, whereas, as adsorbent, sodium or potassium phosphates or sulfates are used. EFFECT: reduced flooding agent loss and increased productivity of well. 13 cl, 3 dwg
