부산대학교 도서관

Model studies have demonstrated that the efficiency of the steam drive in a reservoir in which early communication between wells is established is relatively independent of thickness, except that the efficiency begins to fall for very thick reservoirs. Experiments have also shown that the effectiveness of the steam drive increases so rapidly as the viscosity of the heated oil decreases that it is probable that the residual oil in a number of water flooded reservoirs can be economically recovered by the steam drive. The substitution of a non-condensible gas for a fraction of the steam, either alternating with or simultaneously with steam injection, in a mature steam drive results in a significant increase in oil/steam ratio since the non-condensible gas is capable of displacing the heated oil. 12 refs.