COMPOSITION FOR LIMITING WATER INFLOW IN PRODUCING WELL Russian patent published in 2018 - IPC E21B33/138 C09K8/508 

FIELD: oil and gas industry.

SUBSTANCE: composition for limiting water inflow in producing well includes invert emulsion consisting of dispersion hydrocarbon phase, a stabiliser of emulsions and dispersed phase. In this case, 40-80 wt % of mixture of oil or products of its processing and tall oil is used as dispersion hydrocarbon phase, 0.5-5.0 wt % polyether with 6000±400 molecular weight as stabilizer of emulsion, water with mineralization from 15 to 300 g/l and 0.01-10.0 wt % of dolomite powder or chalk, or aerosol, or wood powder - as dispersed phase: at that, the volume ratio of oil or products of its processing and tall oil in their mixture is from 1:3 to 3:1.

EFFECT: increased efficiency of water inflow in the production well, improved stability and rheological properties of emulsion systems obtained in formation conditions that allows to obtain a durable waterproofing screen in the oil formation producing wells.

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