Numerical Evaluation of Multi-well Cyclic Gas Injection Technique for Enhanced Oil Recovery in Composite Tight Oil Reservoirs

Tight oil reservoirs are a crucial source for achieving energy security, but their economic development is hampered by rapid production rate declines and low initial recovery. This study utilizes numerical analysis to explore the viability of the multi-well cyclic technique (cyclic injection with cyclic production) in addressing these challenges, aiming to ensure sustained production rates and enhanced recovery. Using compositional modeling, the recovery performance of the multi-well cyclic technique is investigated and compared with other enhanced oil recovery (EOR) techniques including gas flooding and cyclic injection with varying production schemes, in a tight reservoir setting. The simulation results emphasize the efficacy of the multi-well cyclic technique in sustaining production rate and improving oil recovery over other techniques. Further sensitivity analysis explores the influence of key parameters such as gas injection rate, production bottomhole pressure, and matrix permeability on oil recovery. Findings reveal that optimal parameters for efficient oil recovery using the multi-well cyclic technique involve a gas injection rate of 4000 m³/d, a production bottomhole pressure of 8 MPa, and low matrix permeability. The evaluation of various EOR methods demonstrated that the Cyclic-Cyclic injection mode significantly outperforms both gas flooding and other cyclic injection techniques. This method not only sustains a higher production rate over time but also achieves superior overall oil recovery, highlighting its effectiveness in maximizing reservoir performance. The results suggest that the Cyclic-Cyclic approach offers a more efficient and reliable strategy for optimizing oil extraction compared to traditional methods. This study provides valuable insights into enhancing oil recovery in tight oil reservoirs, offering a foundation for future studies and field applications.