METHOD OF LEVELING INJECTIVITY PROFILE OF INJECTION WELLS AND LIMITING WATER INFLOW TO PRODUCTION WELLS Russian patent published in 2018 - IPC E21B43/22 E21B43/32 C09K8/84 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and may be used when limiting water inflows into production wells or to equalize the injectivity profile of injection wells. In the method for leveling the injectivity profile of the injection wells and limiting the water inflow into the producing wells, including injection of a gelling agent, containing sodium silicate, chromium acetate and water into the reservoir, setting of the induction period of the gelling agent at the reservoir temperature, pushing of the said agent into the reservoir and a technological pause: in the first embodiment, zinc oxide is introduced into the aqueous solution, and as a filler - wood meal is used with the following ratio of components, mass%: sodium silicate - 0.5-10, chromium acetate - 0.3-1.8, zinc oxide - 0.03-0.07, wood meal - 0.001-3.0, water - the rest; in the second embodiment, magnesium oxide is introduced into the aqueous solution, and as waste - zeolite catalysts production waste (ZCPW) is used at the following components ratio, mass%: sodium silicate - 0.5-10, chromium acetate - 0.3-1.8, magnesium oxide - 0.03-0.07, ZCPW - 0.1-5.0, water - the rest. In this case, before the injection of the finished agent, a fresh water rim is pumped into the wells in a volume of 1.0-1.5 of pore volumes, containing tetrasodium salt of ethylenediaminetetraacetic acid - Trilon "B" in an amount of 0.01-0.05% by weight. Induction period of the gelling agent at the reservoir temperature is set to 4-8 hours, and the technological pause is chosen with a duration of 20-30 hours. Then the well is put into operation.

EFFECT: technical result is an increase in the efficiency of oil displacement from the reservoir by gelling (viscoelastic) agents due to the increase in strength of these agents and reduction of energy costs by shortening the induction period of gelling.

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