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Geothermal electricity generated over the lifetime of the field Electric Duration (years) Start → End (year) Production rate (kg/s/well) CO2 injection (kg/s/well) Stage Conventional Natural Gas Recovery (CNGR) 26 0→26 2.5 - 1 26→27 6 18 EGR 1 27→28 27.5 27.5 CPG 32 28→60 27.5 27.5 CNGR EGR CPG Power generated from indirect Organic Rankine Cycle (ORC) using heat extracted from produced methane. Indirect system (for methane component) h =𝑓(𝑃 ,𝑇 ); 𝑖𝑛 𝑤𝑒𝑙𝑙h𝑒𝑎𝑑 𝑤𝑒𝑙𝑙h𝑒𝑎𝑑 = 𝑓(𝑃 , 𝑇 ); 𝑤𝑒𝑙𝑙h𝑒𝑎𝑑 𝑜𝑢𝑡 h 𝑜𝑢𝑡 𝑇 𝑜𝑢𝑡 = 332 K, calculated from the R245fa approximation plot (Adams et al. 2015). Heatextracted = 𝑚ሶ ∗ (h𝑖𝑛 − h𝑜𝑢𝑡); ŋ𝑡h ∗ Heatextracted Powerindirect = Peak Gross Power = 2.14 MWe Peak Net Power = 1.624 MWe Where ŋ𝑡h is the correlated thermal efficiency (kWe/kWth) of an R245fa cycle. Average of 0.05 is calculated using the prevailing inlet temperature. Direct system (for CO2 component) 𝑆 ,h =𝑓(𝑃 ,𝑇 );@theturbine 𝑖𝑛 𝑖𝑛 𝑤𝑒𝑙𝑙h𝑒𝑎𝑑 𝑤𝑒𝑙𝑙h𝑒𝑎𝑑 Power generated through direct CO2 expansion in a turbine. Power increases as fluid composition becomes mostly CO2. Power decreases over time as production wellhead enthalpy decreases. 26 28 h =𝑓(𝑃 ,𝑆); 𝑜𝑢𝑡,𝑠 𝑐𝑜𝑛𝑑 𝑖𝑛 h𝑜𝑢𝑡 = h𝑖𝑛 − ŋ𝑖 ∗ (h𝑖𝑛 − h𝑜𝑢𝑡,𝑠); accounted for isentropic expansion ŋ𝑖 is the turbine isentropic efficiency, 0.78 is used (Adams et al. 2015). Adams B.M., et al. (2015). A comparison of electric power output of CO2 Plume Geothermal (CPG) and brine geothermal systems for varying reservoir conditions. Appl. Energy, 140:365–77. Figure 11: Time series of total geothermal electricity generated from all 4 production wells over 60 years. Calculations are made based on the concept that power is generated from the heat extracted from the produced methane via a Rankine cycle (indirect system) and power is generated from the produced CO2 via a CO2 turbine expansion (direct) system. Powerturbine = 𝑚ሶ ∗ (h𝑖𝑛 − h𝑜𝑢𝑡); i.e. Gross power Powernet,direct = Powerturbine − Powerfan,cool − Powerpump; i.e. Net power Geothermal Energy and Geofluids group Total power generated [MWe]PDF Image | Combinging CO2 Capture and Geothermal Power Generation
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