A Closed-Loop Optimization System for Evaluating the Development Effect and Potential of Producers with Water Alternating Gas Flooding

Water alternating gas (WAG) flooding is a relatively mature technology for enhanced oil recovery (EOR). It combines the advantages of water flooding and gas flooding to maintain reservoir pressure and effectively mitigate the issues of high mobility ratio and fingering, demonstrating preferable application prospects. However, the evaluation of its development effect faces the challenges of complexity and lack of adaptability attributed to the multiple interactions of various factors involved in WAG flooding. Moreover, there are few studies evaluating the development effect of producers. Therefore, the traditional hierarchical analysis process (AHP) is improved in this study to fill the gap in this technological field. This process is combined with the entropy weight method (EWM) to establish a coupled evaluation model. Subsequently, this study classifies the contribution weights of producers and proposes adjustment suggestions for the primary development contradictions. This study finds that the contribution weight of producers to the well group indicates that the development effect of producers is no longer influenced by a single factor, but is determined by the coupling effect of geological, engineering, and development factors. By constructing a coupled model and fully utilizing on-site data to objectively characterize the underground production situation, the development effect of producers can be more accurately reflected. Finally, a closed-loop optimization system for evaluating the development effect and potential of producers with WAG flooding is established, laying a theoretical foundation for dynamic analysis and development adjustment of on-site engineers.