METHOD OF OIL FIELD DEVELOPMENT Russian patent published in 2018 - IPC E21B43/16 E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used in development of oil fields by water flooding pay beds. Method comprises determining a current oil recovery factor – ORF of the bed and an amount of highly-permeable channels of the bed. Required amount of chemical plugs is injected into the injection wells. If the current ORF is less than 0.25 of target ORF, the total injected amount of chemical plugs is accepted as no more than 0.1 of the amount of highly-permeable channels of the bed. As chemical plugs, emulsion system rims and alkaline chemical solution plugs, or surfactants, or polymers, or hydrocarbon solvents are injected into the injection well. If the current ORF is from 0.25 to 0.5 of the target ORF, the total injected amount of chemical plugs is accepted as 0.1–0.5 of the amount of highly-permeable channels of the bed. As chemical plugs, alkaline chemical solution plugs, or surfactants, or polymers, or precipitate-gelling compositions, or disperse systems, or dispersed filler polymers are injected into the injection well. If the current ORF is greater than 0.5 of the target ORF, total injected amount of chemical plugs is accepted as 0.5–1.5 of the amount of highly-permeable channels of the bed. As chemical plugs, alkaline chemical solution, surfactant solution and polymer solution, or viscous emulsion formulations with dispersed fillers, or hydrocarbon solvents with a surfactant additive are successively injected into the injection wells.

EFFECT: technical result is increased flooding efficiency due to regulation of permeability of highly-permeable channels, changes in directions of filtration flows by injecting the optimum amount of chemical plugs into the injection wells, alignment of the front of displacement and connection of residual oil.

5 cl, 1 tbl, 2 dwg