Analysis of the enhanced oil recovery process through a bilateral well using WAG-CO_2 based on reservoir simulation. Part II - real reservoir model

摘要

Based on the general conclusions in part I of the study, this part II presents the analysis of the selected EOR methods with particular attention paid to the WAG (Water-Alternating-Gas) method and its SWAG (Simultaneous Water-Alternating-Gas) version, involving the simultaneous and selective injecting of water and CO_2 (water through the upper section of the injection well, CO_2 through the lower section of the well) for a real reservoir model. Forecasts of oil production have been performed with the use of the primary method, waterflooding method as well as the WAG and SWAG methods. For each of the above production methods, additional options were considered to increase the number of injection wells from 6 to 8. In order to perform the above described forecasts, a number of general assumptions were made concerning the amount of injected and produced liquids as well as limitations associated with them. The paper presents a detailed analysis of the reservoir operation for each case. Results of total amounts of the injected and produced fluids are presented in detail. Qualitative assessment of the analyzed methods is presented based on the main simulation results including distribution of oil saturation in the reservoir model at the end of production forecasts.