METHOD OF OIL FIELD DEVELOPMENT Russian patent published in 2025 - IPC E21B43/27 E21B33/138 C09K8/74 C09K8/42 B82B1/00 

FIELD: methods or apparatus for producing oil.

SUBSTANCE: in the oil deposit development method, preliminarily determining the injectivity in the injection wells on the site and the perforation interval, selecting the injection well, which intake capacity is reduced by more than 50%, stopping the selected injection well, samples are taken from a bottom-hole zone of a formation in an injection well and the reason for reduction of injectivity is identified. If the reason for the decrease in injection capacity of the injection well is colmatage formations containing asphaltene-paraffin deposits, an acid composition containing the following, wt.%, is injected into the injection well: 18% aqueous solution of hydrochloric acid 50; acetic acid 20; water repellent 10; diethylene glycol 10; process water 10, in amount of 1.5 m³ per 1 running m of the perforation interval, and performing the acid composition flushing with an aqueous solution of titanium coagulant nanoparticles with volume of 3 m³ per 1 running m of the perforation interval, with a ratio of water and titanium coagulant nanoparticles of 3:1, respectively . Further, mud-acid composition containing the following, wt.%, is injected: 18% aqueous solution of hydrochloric acid 25; hydrofluoric acid 25; boric acid 25; acetone 15; technical water 10, in amount of 1 m³ per 1 running m of the perforation interval. Mud-acid composition is flushed with said aqueous solution of titanium coagulant nanoparticles with volume of 3.5 m³ per 1 running m of perforation interval. Further, the composition is pumped in volume of 0.5 m³ per 1 running m of the perforation interval, consisting of a hydrocarbon solvent and said mud acid composition with ratio of 1:1. Composition is forced through with said aqueous solution of nanoparticles of titanium coagulant with volume of 4 m³ per 1 running m of perforation interval. Further, insulating composition is pumped, containing, wt. %: polymer reagent "Vitam", containing carboxyl groups, 27; sodium silicate 40; wood flour 3; 10 % aqueous solution of polyaluminium chloride 30, with volume of 2 m³ per 1 running m of perforation interval. Insulating compound is pressed with said aqueous solution of titanium coagulant nanoparticles with volume of 3 m³ per 1 running m of perforation interval. Then, process exposure is performed with duration of 8-12 hours; after that, injection well is started.

EFFECT: enlarging the coverage of the mine working of the deposit due to the integrated action on the bottom-hole zone of the formation, which provides increase of injection capacity of the injection well.

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