METHOD FOR LIMITING WATER INFLOW IN PRODUCTION WELL Russian patent published in 2021 - IPC E21B43/22 E21B33/138 C09K8/502 C09K8/524 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry. The method for limiting water inflow in a production well includes determining the injectivity of the production well, injecting an invert emulsion into the formation. When the intake capacity is below 250 m³/day, the invert emulsion rim is pushed with mineralized water in a volume of 0.5-1 of the invert emulsion rim volume. After the injection of the invert emulsion rims, the rim of the composition containing the solvent and distillation residues of butyl alcohols DRBA is injected; an industrial solvent, or a hydrocarbon solvent, or toluene is used as a solvent with the following ratio of components, wt.%: solvent 80-85 and DRBA 15-20 , when the ratio of the volumes of the rims of the composition containing the solvent and DRBA, and the invert emulsion is 1:(2-3). When injectivity is higher than 250 m³/day, a rim of invert emulsion with wood flour is injected, with the following ratio of components, wt.%: invert emulsion 99.80-99.95 and wood flour 0.05-0.20. Next, the edging of the invert emulsion with wood flour is pressed through with mineralized water in a volume of 0.5-1 of the volume of the invert emulsion rim. Then, the rims of the composition containing the above solvent and DRBA are injected at the following ratio of components, wt.%: solvent 80-85 and DRBA 15-20, with the ratio of the volumes of rims of the composition containing the solvent and DRBA, and invert emulsion with wood flour 1:(3-4).

EFFECT: increasing the efficiency of isolating water inflow in the production well and increasing the productivity of the producing well for oil due to effective hydrophobization of the surface of the porous medium of the formation, effective blocking of highly permeable intervals of the formation and a high ability to change the filtration characteristics of the bottomhole formation zone for oil.

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