METHOD OF DEVELOPMENT OF OIL POOL Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in development of oil formations by waterflooding. SUBSTANCE: method includes displacement of oil by fringe formed by successive injection into formation through injection wells of aqueous suspension based on mixture of bentonite clay and polyacrylamide and reagent, pushing it over formation by displacing fluid. Reagent is used in form of aqueous suspension based on mixture of wood flour, condensed spent sulfite-alcohol liquor and potassium bichromate. Added to aqueous suspension based on mixture of bentonite clay and polyacrylamide may be chromium acetate or bichromate of potassium or sodium. Pushing may be effected after injection of each suspension. In a variety of cases, operations of injection and pushing are repeated. EFFECT: increased coverage by waterflooding for long period of time, involving into active development of slightly drained or nondrained oil reserves, and increased oil mobility due to reduction of its viscosity. 4 cl, 1 tbl