METHOD OF EXTRACTING OIL FROM 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 are batched fresh or mineralized water and a detergent composition Neominol, which is a water-alcohol solution of a mixture of non-ionic surfactants, and simultaneously, water-insoluble magnesium oxide nanoparticles 5–100 nm in size and with specific surface area of 64.5 m²/g are dosed into the mixing tank using a screw feeder for loose reagents with continuous stirring for at least 30 minutes until they are uniformly distributed. Obtained suspension is pumped into the loading unit of the installation for preparation of solutions from liquid and loose chemical reagents. Then, polyacrylamide is added to the obtained suspension by means of a screw feeder intended for dosing and supply of powdered reagents to obtain a composition for waterflooding at the following ratio of components, wt.%: Neominol 0.1–0.5; said magnesium oxide nanoparticles 0.01–0.07; polyacrylamide 0.3–0.7; said water is the rest. Composition for waterflooding 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: increased efficiency of the method of oil extraction from oil formation due to increased surface activity of oil-displacing composition.

1 cl, 1 dwg, 5 tbl, 1 ex