METHOD FOR CONTROLLING WATER-FLOODING FRONT OF OIL FORMATIONS Russian patent published in 2006 - IPC E21B43/22 C09K8/88 

FIELD: oil extractive industry, in particular, methods for extracting a watery oil pool, possible use for increased oil recovery of fractured formations with heterogeneous penetrability.

SUBSTANCE: method for controlling water-flooding front of oil formations includes stopping at least one force well and performing technological exposure for restoration of current bed pressure in bottom hole zone of well with following forcing of fringes of filtration-limiting compound, while increasing forcing pressure and changing concentration of compound in each fringe. Aforementioned compound is received by mixing a composition, containing, in percents of mass: polymer 0,005-2,0, sodium silicate 0,1-10,0, latex 0,01-15,0, fresh water - the rest, and mineralized water with ratio of volumes changing within limits 1:1-1:30, while feeding pressure is increased no more than by 1%, not exceeding the maximal allowed pressure for each individual well.

EFFECT: increased oil recovery of formations due to increased efficiency of isolation of waters in fractured and heterogeneous beds due to creation of a durable hydro-screen, making it possible to exclude watery zones from extraction and to extract oil-saturated, previously unused zones by means of following water-flooding.

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