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 and non-ionic high-molecular surfactant alkylphenol with carbon chain length C9-12—Neonol AF9-12 are dosed, and simultaneously water-insoluble magnesium oxide nanoparticles 5–100 nm in size, with a specific surface area of 64.5 m²/g, are dosed into a mixing tank 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 preparation of solutions from liquid and loose chemical reagents. Then, into produced suspension by means of screw feeder, 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 %: Neonol AF9-12 0.1–0.5; said magnesium 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: increased oil recovery from oil reservoir due to increased oil-displacing surface activity.

1 cl, 1 dwg, 5 tbl, 1 ex