The Application Effect of Polymer-Alternating-Gas in the Daqing X Block Reservoir

DOI: 10.14800/IOGR.1316

Abstract

As global demand for oil continues to rise, conventional reservoir extraction methods have proven insufficient to meet current production needs. To enhance oil recovery rates, researchers have investigated more economically viable extraction techniques. Among these, polymer flooding and CO₂ injection have gained recognition as cost-effective methods. However, despite extensive research, the effectiveness of Polymer-Alternating-Gas (PAG) injection in field-scale applications remains ambiguous.

This study employs the commercial reservoir simulation software CMG-GEM to construct a three-dimensional geological model of the Daqing X Block, based on detailed geological data. Using an orthogonal experimental design approach, the injection parameters for the PAG process are optimized through numerical simulation to determine the optimal injection scheme for the Daqing X Block. Furthermore, the study conducts a comprehensive comparison of the development performance and oil displacement efficiency of Water flooding, Polymer flooding, Water-Alternating-Gas (WAG), and PAG injection methods. The results indicate that PAG injection can significantly enhance the recovery factor and demonstrates favorable application potential in the Daqing X Block reservoir.

This research provides critical theoretical insights and practical guidance for the implementation of Polymer-Alternating-Gas injection in oil field development.