METHOD OF DEVELOPING OIL DEPOSIT IN CARBONATE RESERVOIRS OF FISSURED TYPE Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this can be used in development of carbonate beds with subvertical fissures. According to method, drilled are producing and injection wells, product is recovered through producing wells at determined values of bed pressure, displacing agent is injected in cyclic mode, acid solution is injected between cycles of injecting displacing agent, and levelling of displacing front is effected by injection of polymeric solution. After starting watering of producing wells and after fringing of acid solution, injected is fringing of polymeric solution at pressures which exceed opening pressure of vertical fissures. Carbon dioxide created at injection of acid solution reduces viscosity and surface tension of oil. Thickening of solution by polymeric systems leads to levelling of displacement front and in result, range of acting upon bed widens. EFFECT: high efficiency. 1 cl, 3 dwg