COMPOSITION FOR LEVELLING WELL INJECTIVITY PROFILE Russian patent published in 2025 - IPC C09K8/506 C09K8/584 

FIELD: mining.

SUBSTANCE: invention relates to oil industry. Composition for balancing the well injectivity profile contains the following, wt.%: zwitterionic surfactant – cocamidopropyl betaine 0.7-9.5; anionic surfactant – sodium lauryl sulphate or sodium alkylbenzosulphonate 0.25-2.5; nonionic surfactant – neonol AF_9-10 0.84-12; precipitate-forming agent based on an alkaline solution of sodium salts of carboxylic and polycarboxylic acids 10-50; water – balance. Precipitate-forming agent based on an alkaline solution of sodium salts of carboxylic and polycarboxylic acids contains the following, wt.%: nonionic surfactant 0.02-12; anionic surfactant 0.02-5; sodium salts of carboxylic and polycarboxylic acids in terms of disodium adipate 1-30; mineral salts – potassium, sodium, calcium, magnesium and ammonium chlorides 0.02-10.

EFFECT: aligning the injectivity profile and increasing the sweep of the formation by flooding by isolating the highly permeable sections of the formation formed upon contact of the composition with mineralized formation water by a viscous finely dispersed colloidal system, and more complete displacement of oil due to washing from oil of low-permeable oil-saturated sections of formation.

1 cl, 5 tbl, 1 ex