In response to escalating global energy demands and climate change threats, this paper explores the potential integration of CO2 injection in geothermal energy production (GEP). The global energy sector, a significant greenhouse gas emitter, necessitates a shift towards renewable energy, and GEP stands out as a promising clean energy source. This study focuses on CO2 as an injectant, leveraging its higher enthalpy change in the supercritical state and potential for carbon capture, utilization, and sequestration (CCUS). Despite CO2's advantageous properties, logistical challenges and higher costs have hindered its widespread adoption in GEP. Enthalpy, a key thermodynamic concept, plays a pivotal role in understanding CO2 thermal behavior. Investigating the change in enthalpy concerning pressure and temperature showcases CO2's rapid energy absorption and release capabilities, distinguishing it as a viable candidate for renewable energy production in GEP. The proposed closed-loop CO2 cycling system, though limited in carbon storage, demonstrates significant carbon utilization potential. By repurposing CO2 as an injectant, back-producing it for GEP, and continuously cycling it within the reservoir, the study explores a sustainable energy generation model. Using reservoir simulation, the research assesses the feasibility of the CO2 injection and thermosiphon process. The initial pilot simulation reveals challenges such as a limited CO2 cushion and logistical constraints, prompting modifications to the injection process. The modified injection method, involving both injector and producer perforations, shows promise in sustaining energy production and reducing water production. In conclusion, this study provides valuable insights into the feasibility and efficiency of utilizing CO2 as an injectant in GEP. While challenges exist, addressing logistical concerns and optimizing injection methods could unlock the full potential of this innovative approach, contributing to the transition to sustainable and clean energy sources.

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