REAGENT FOR CONTROL OF INJECTION WELL INJECTIVITY PROFILE (VERSIONS) Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in increase of formation oil recovery, particularly, for nonuniform formations at late stage of deposit operation. SUBSTANCE: reagent for control of injection well injectivity profile contains (1st version), wt.p.p.: trisodium phosphate 1; mud powder 4. Reagent for control of injection well injectivity profile contains (2nd version), wt.p.p.: trisodium phosphate 1; mud powder 3.96-3.98; polymer 0.02-0.04. EFFECT: provided reagent based on mud powder with optimal content of alkali component whose presence improves main production process parameters such as degree of swelling, higher washing ability of filtrates of aqueous solutions of reagent due to reduction of interphase tension on boundary with hydrocarbons, increased coverage of formations. 2 cl, 2 tbl