METHOD FOR WORKING OIL FIELDS Russian patent published in 1995 - IPC

FIELD: oil wells. SUBSTANCE: method involves pumping in solvent and dry gas in turn into the layer. Ratio of solvent and dry gas steam volumes is determined from the ratio of solvent and dry gas volumes in the critical point of oil-solvent-gas mixture at layer temperature and pressure to be determined from an expression , where V_thr.s is the solvent threshold volume in m³; V_thr.dg is the dry gas threshold volume in m³; Ф_crit is the solvent share in the critical point at layer temperature and pressure, in m³; P_ls is the solvent layer pressure, in MPa; T_ls is the solvent layer temperature, in C ; P_lg is the dry gas layer pressure in MPa, T_lg is the dry layer temperature in C . EFFECT: enhanced effectiveness of working process. 1 dwg, 2 tbl