Review of Enhanced Gas Recovery Techniques Using CO2, N2, and Hydrocarbon Gas Injection

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Researchers gain a systematic framework for comparing EGR methods and their CCUS integration potential.

🏢実務担当者:Practitioners can use the multi-criteria screening approach to select appropriate injection gases for specific reservoir conditions.

🏛政策担当者:Policymakers note the dual benefits of EGR with CO2 storage, supporting policy frameworks for CCUS deployment.

The study reviews major enhanced oil recovery (EOR) methods and evaluates enhanced gas recovery (EGR) methods which use CO2, N2 and hydrocarbon gases to enhance gas production from tight, conventional and depleted gas reservoirs. It discusses displacement methods, reservoir compatibility, adsorption-desorption behavior and EGR system durability. The research examines laboratory experiments, numerical simulations and field tests of EGR systems with focus on conformance control, miscibility behavior and CO2–gas exchange for simultaneous EGR and storage operations. The paper combines displacement experiment results with adsorption–desorption study data and reservoir simulation modeling output. It evaluates gas injection performance by examining performance indicators. Research investigates how CO2 density affects gas displacement, how N2 pressure support works and how hydrocarbon gas miscibility improves with enrichment. The research analyzes EGR operational effects on deliverability rates and recovery factor improvements through field pilot data and synthetic reservoir models. The research discusses EGR–CCUS (carbon capture, utilization and storage) hybrid systems and monitoring systems as well. The findings demonstrate that CO2 injection produces favorable displacement results because of its density and viscosity benefits, yet it needs continuous monitoring to prevent premature breakthroughs. The injection of N2 gas helps preserve formation pressure in tight formations though it fails in cleaning the entire reservoir area. The injection of hydrocarbon gases improves gas miscibility and demonstrates strong potential for late-stage gas recovery. Research findings indicate major adsorption effects in tight reservoirs, impacting their gas exchange rates. EGR systems working with CCUS technology provide operators with advantages of improved recovery and safe carbon storage, but they must track potential geochemical and geomechanical risks. The review emphasizes the roles of proper injection methods and exact modeling of gas mixing processes for successful EGR operations in heterogeneous reservoirs. The review conducts an assessment of EGR methods that employ CO2, N2 and hydrocarbon gases by using standardized performance metrics. The research develops a novel multi-criteria screening approach by considering compositional behavior analysis with adsorption property evaluation and storage compatibility testing.

• semanticscholar https://doi.org/10.2118/232517-msfirst seen 2026-05-23 05:55:55 · last seen 2026-05-27 05:05:00