METHOD OF EXTRACTING OIL FROM AN OIL FORMATION USING NANOPARTICLES Russian patent published in 2024 - IPC E21B43/22 C09K8/588 B82Y99/00 

FIELD: oil industry.

SUBSTANCE: in the method of extracting oil from an oil formation directly at the well before pumping into the formation into a mixing tank by pumps, fresh or mineralized water with total mineralization of up to 300 g/l and Neominol detergent composition, which is a water-alcohol solution of a mixture of non-ionic surfactants, are dosed, and at the same time water-insoluble zinc oxide nanoparticles with size of 500 nm of oval or round shape are dosed into the mixing vessel using a screw feeder for loose reagents with continuous stirring for at least 30 minutes until their uniform distribution. Obtained suspension is pumped into the loading unit of the installation for the preparation of solutions from liquid and loose chemical reagents, then into the obtained suspension with a screw dosing unit, intended for dosing and supply of powdered reagents. With constant stirring, polyacrylamide is added to obtain a water-flooding composition at the following ratio of components, wt %: Neominol 0.1–0.5; said zinc oxide nanoparticles 0.01–0.07; polyacrylamide 0.3–0.7; said water is the rest. Composition for water-flooding is mixed for 10–15 minutes, then it is pumped into the oil formation through an injection well, oil is extracted from production wells.

EFFECT: higher efficiency of oil extraction by increasing displacement agent surface activity.

1 cl, 1 dwg, 5 tbl, 1 ex