| Abstract |
Implementing a Water Alternating Gas (WAG) project involves huge capital expenses; thus, pilot projects are crucial for assessing the performance and effectiveness of WAG injection, providing valuable insights into technical aspects, project economics, profitability, and operational risks. This study evaluated the performance of miscible WAG injection using time-lapse saturation measurements for a compartmentalized sandstone reservoir. Petrophysical and geological analyses were conducted for pilot project site selection. One injector and one observation well with 525 ft separation were proposed for this study. Modular Dynamic Tester (MDT) tests were performed for each well to evaluate connectivity within the reservoir layers, and build-up and fall-off tests were performed during each cycle to assess the skin value and identify potential issues with injectivity. The project spanned 40 months and consisted of four cycles, with WAG ration of 0.853. The collected data were extensively analyzed to closely monitor and gain a deeper understanding of (WAG) injection during the project. Integrating findings from various test analyses enabled more effective monitoring of the WAG injection process and provided a better understanding of sweep efficiency performance, accounting for multiple operational interferences. The results demonstrated a decrease in total hydrocarbon saturation to below 10% which can yield an incremental recovery of 14% of OOIP . |
, Ilyas Mellal 
, Oussama Larkem
