Abstract
Miscible flooding using an alternate solvent/water injection process (WAG) is currently being applied for enhanced oil recovery. The main reason of alternating solvent/water is to improve the mobility of the system which will yield better areal sweep efficiency and more reservoir oil contacted by the solvent.
Normally laboratory work is performed to assess or select the optimum WAG process of the miscible flooding system being investigated. The main objective of the laboratory work is to select the process (WAG 1:1, 1:2, or 2:1) which will result in an optimum displacement efficiency. The purpose of this study is to investigate the effect of various WAG ratios on the areal sweep efficiency. An experimental work was conducted using one-quarter five spot model.
The WAG ratio was varied for specified ratios of 1:1, 1:2, and 2:1. Three equations were obtained to predict the areal sweep as a function of mobility ratio for various WAGs. The results of this work could be utilized in performing numerical and analytical miscible models for candidate EOR reservoirs.