Heat Recovery Mechanism for Non Condensable Geothermal Fractured Reservoirs by CO2 Injection and Well Heat Insulating
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In this thesis we analyzed the potential use of operating geothermal plants with water and CO2 as working fluids using a geothermal simulator TOUGH2 module EOS1 and EOS2, respectively. We also studied the sensitivities of different parameters on heat extraction. In addition, we also analyzed the heat preserving possibilities in the wellbore by varying both the thermal conductivity and thickness of the insulators. The results showed that CO2 was a far better working fluid than water, and could be used as an enhanced working together in non-condensable gas reservoir. We also observed that optimization of fracture porosity and flow rate had more positive impacts on heat extracted than fracture permeability and fracture spacing in such system. In addition parameters such as porosity and fracture, spacing had a direct impact on the time for which the system attained the steady state, which in turn contributed to the amount extracted. Concerning heat insulating in the well, the result showed that there was a need of using low thermal conductive cement when the production tube was not insulated. On the contrary when the tubing was insulated with an insulator of a specific thickness, for which thicker was better and thermal conductivity, for which lower conductivity was better, then the cement played a minor a role as an insulating material in this regard.
Master's thesis in Petroleum technology