METHOD FOR PROCESSING FACE ZONE OF OIL POOL Russian patent published in 2007 - IPC E21B43/22 C09K8/60 

FIELD: oil extractive industry, in particular, methods for processing face zone of oil pool, possible use for increasing efficiency of oil extraction.

SUBSTANCE: method for processing face zone of oil pool includes successive forcing in of blocking reagent and acidic composition. As blocking reagent, oil is used taken from oil preparation plants, with viscosity of 1,0-100,0 mPa*s and water content less than 5,0% or hydrocarbon composition - marginally soluble surfactant in hydrocarbon - with mineralized water with density of 1050-1120 kg/m³ with ratio 1:2 respectively, or water solution of polyacrylamide with concentration 0,1-0,3%, as acidic composition, compound composed of, in percents of mass: hydrochloric acid or mixture of hydrochloric and hydrofluoric acid 25,0-80,0, water-methanol fraction - side product of production of technical phosphorous acid or methanol (of methanol) 1,0-24,5, technical lignosulphate 2,0-20,0, nonionic surfactant 0,1-5,0, water the rest, blocking reagent and acidic composition are used in volumetric ratio equal to 1:0,5-3,0 respectively.

EFFECT: increased efficiency of method for processing face zone of oil pool, blocking of highly penetrable water-saturated seams, thus making it possible for acidic composition forced in later to penetrate deeper into water-oil saturated and oil saturated pools.

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