Analysis of the enhanced oil recovery process through a bilateral well using WAG-CO2 based on reservoir simulation. Part II – real reservoir model

Abstract

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.

Reservoir Simulations of Hydrogen Generation from Natural Gas with CO2 EOR: A Case Study

“…The obtained CO 2 can be used together with water in various EOR schemes such as CO 2 WAG and CO 2 SWAG [24][25][26]. The efficiency of these schemes can be further improved by selectively injecting these fluids [26,27]. Under typical reservoir conditions of pressure and temperature, injected CO 2 becomes an oil-displacing fluid via the miscible displacement mechanism [28][29][30], causes a significant reduction in the final oil saturation and thus an increase in the final oil depletion factor [24].…”