Effect of Heterogeneity of Reservoir Properties on Sandstone Formations in Oil Recovery

Abstract

The case study for this research is an oil field with sandstone formations. The background of this problem is that many oil fields in Indonesia have been operating for a long time. The method used to analysis heterogeneity and its effect on oil recovery was carried out by using Dykstra Parson[1] analysis, analysis of porosity and permeability data distribution, analysis of the calculation of the mobility ratio[2][3]. Furthermore, it can be calculated the efficiency of oil sweeping[4][2]. Based on the Dykstra Parson analysis, the value obtained is 0.93 and the mobility ratio is more than 1. The next method is to determine the efficiency of mobility (sweep efficiency) which is associated with the average standard deviation of the values of porosity and permeability. The mobility efficiency value of this field is 47.12%. From the relationship between the value of mobility efficiency to the standard deviation of porosity and permeability, it shows that the greater the standard deviation value, the smaller the oil sweeping gain. Finally, this research aims to know the heterogeneity of the rocks to obtain predictions of oil recovery.