محمدپويا نيكوقديرلي

Abstract This research investigates the simulation of carbon dioxide (CO₂) injection in gas reservoirs with the dual objectives of carbon storage and Enhanced Gas Recovery (EGR). The study emphasizes the importance of managing greenhouse gas emissions and optimizing hydrocarbon extraction in the context of global energy demand and environmental concerns. Advanced numerical modeling and simulation techniques are employed to analyze CO₂ behavior in geological formations, focusing on interactions between CO₂, natural gas, and reservoir rock. Key findings reveal that CO₂ injection improves natural gas recovery rates and provides a viable method for long-term carbon storage, thereby mitigating climate change impacts. Reservoir modeling and simulation were conducted using Eclipse 300 (a compositional simulator) and the open-source Norne field model (for grid properties). Results demonstrate a significant increase in gas recovery efficiency and highlight the critical role of reservoir characteristics, such as permeability and porosity, in determining CO₂ storage success. The study primarily focuses on sensitivity analyses of CO₂ injection location, injection rate, and injection timing within the reservoir. Additionally, it compares production and injection outcomes, eva‎luates reservoir responses to these analyses, and assesses the economic viability of each analyzed parameter. Overall, initiating CO₂ injection closer to the late-life stage of the gas reservoir, yields better results in enhancing gas recovery factors. Conversely, if EGR is not prioritized and the goal is to maximize CO₂ storage, higher injection rates, and location optimization aligned with this objective are required. In the gas reservoir studied in this thesis, the rock-fluid expansion mechanism of the reservoir is under investigation. Consequently, the optimal scenario for injection occurs when production wells reach the late stages of their productive life. According to this strategy, initiating CO₂ injection after 12 years of primary production (without injection) can enhance the ultimate recovery factor of the reservoir from 69% to 89%, reflecting a 20% improvement in gas recovery efficiency. This research advances the understanding of CO₂-EGR processes. It offers practical insights for implementing Carbon Capture and Storage (CCS) technologies in gas reservoirs, ultimately supporting the transition to a low-carbon energy future. The findings underscore the necessity of integrated approaches that balance economic profitability with environmental sustainability, paving the way for developing reservoirs as dual-purpose energy-carbon infrastructure.

ذخيره سازي , دي اكسيد كربن , شبيه سازي , ازدياد برداشت گاز , تزريق گاز

Storage , Carbon Dioxide , Simulation , Enhanced Gas Recovery , Gas Injection

Mohammad Pouya Nikooghadirli

Dr. Rohaldin Miri & Dr. Hamid Reza Jahangiri