METHOD OF OIL POOL DEVELOPMENT Russian patent published in 1997 - IPC

FIELD: oil producing industry. SUBSTANCE: method includes withdrawal of oil from producing wells and injection through injection wells into oil pool outline of water and acid fringes. Novelty in the offered method is injection of acid with thickening agent, in form of peat or coal. To increase efficiency of the method, it is practicable to additionally inject fringes of oxidizer or gas. In case of high degree of formation nonuniformity, it is recommended to additionally inject fringes of water thickened with peat. To reduce corrosion activity of acid, it is recommended to add alcohol or nonionic surfactant, and for removal of asphalt-resin and wax deposits, fringe of aqueous solution on nonionic surfactant or fringe of green oil is injected after injection of acid fringe with thickening agent. EFFECT: higher efficiency. 5 cl, 3 tbl