| Title | Assessment of enhanced geothermal system (EGS) methodology for harnessing geothermal energy potential in depleted gas fields |
|---|---|
| Authors | R. Duggal, J. Burnell, J. Hinkley, R. Rayudu |
| Year | 2023 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | Depleted gas fields, Enhanced geothermal system (EGS), Geothermal Energy, Integrated methodology, Reservoir simulation, Process model, Economic analysis. |
| Abstract | This study explores the potential of utilizing depleted gas fields for geothermal energy extraction, employing the Enhanced Geothermal System (EGS) methodology. Depleted gas fields, characterized by their permeablereservoir structures, offer promise for geothermal energy production. The prevailing approach involves injecting hot fluid from the surface, necessitating an assessment of energy consumption during pumping and energy extraction efficiency from the geothermal reservoir. The study introduces a comprehensive framework for assessing geothermal potential in depleted gas fields. A coupled wellbore-reservoir-surface network model is utilized to analyze factors influencing energy production, considering heat loss in low-enthalpy systems. A history-matched model of the depleted gas field predicts reservoir behavior during energy extraction and fluid reinjection using pumps. Economic feasibility is evaluated through a Levelized Cost-based model. Future research may consider evolving reservoir properties in mature oil and gas fields and their impact on energy extraction from mature gas fields. This research advances the understanding of geothermal energy extraction from depleted gas fields, informing policymakers, industry experts, and sustainable energy researchers. Findings are relevant to New Zealand's energy landscape, supporting carbon-neutral goals and sustainability. |