METHOD FOR DEVELOPMENT OF OIL DEPOSITS Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this relates to development of oil deposits with flooding. According to method, injected through injection wells is carbonated water. Oil is recovered through producing wells. This is performed at maintaining ratio of bottom-hole pressure in injection wells to pressure of water saturation with carbon dioxide within range of 1.1-2.2. Before injection of carbonated water, added to water is 0.01-1% of cationic surface-active substance. Application of aforesaid method increases oil recovery from bed due to enlarged embracing of bed by displacement. Also ensured is reduced corrosion of oil field equipment. EFFECT: higher efficiency. 1 tbl