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 injection into the formation, is dosed into a mixing tank by pumps fresh or mineralized water with total mineralization of up to 300 g/l and a non-ionic high-molecular surfactant alkylphenol with carbon chain length C9-12 – Neonol AF9-12 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 tank using an auger dosing unit 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, polyacrylamide is added to the obtained suspension by means of an auger dosing unit for dosing and feeding powdered reagents. to obtain a flooding composition with the following ratio of components, wt. %: Neonol AF9-12 0.1–0.5; said zinc 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: increasing the efficiency of oil extraction from an oil formation by increasing the surface activity of the oil-displacing composition.

1 cl, 1 dwg, 5 tbl, 1 ex