METHOD OF DEVELOPMENT OF WATER-ENCROACHED OIL DEPOSIT Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry, particularly, changing of injectivity profile of injection wells, isolation of waterencroached intervals in producing wells, formation of insolating barriers between interlayers, and in repair operations. SUBSTANCE: method includes injection into well of isolating material which is injected simultaneously in form of aqueous solutions of polyacrylamide and chromium acetate. Isolating material in volume of 50-500 cu.m is injected by parallel flow of aqueous solution of polyacrylamide and aqueous solution of chromium acetate containing additionally stabilizer in form of ammonium chloride with content of components in amount ensuring formation of gel through entire volume with three-dimensional cross- linked structure. Said gel is formed with the following amounts of insulting materials components, wt. %: polyacrylamide solution 0.3-0.5; chromium acetate 0.03-0.1; ammonium chloride 0.2-0.5; the balance, water. EFFECT: provided regulation of oil deposit development with formation zones of any permeability, creation of isolating barriers with improved technological parameters and increased duration of effect. 3 tbl