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Energy­ Sector Fundamentals

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Energy­ Sector Fundamentals ( energy­-sector-fundamentals )

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Chapter 9 Energy­Sector Fundamentals: Economic Analysis, Projections, and Supply Curves Table 9.4 Parameter values for the base case EGS economic models. Parameter description Initial Values Midterm Values Commercially (today’s technology, (years 5­11) Mature Values years 1­5) (years 20+) Geofluid flow rate per producer 20 kg/s 40 kg/s 80 kg/s Thermal drawdown rate 3 %/yr 3 %/yr 3 %/yr Number of production wells per injection well Maximum allowable bottom hole temperature 2 2­3 3 Average surface temperature 15°C 15°C 15°C Impedance per well 0.15 MPa s/L 0.15 MPa s/L <0.15 MPa s/L Temperature loss in production well 15°C 15°C 15°C Water loss/total injected 2 % 2% 1% Drawdown parameter (Armstead and Tester, 1987) 0.000119 kg/s.m2 0.000119 kg/s.m2 0.000119 kg/s.m2 Well deviation from vertical 0° 0° 0° Well separation 500 m 500 m 500 m Geofluid pump efficiency 80 % 80 % 80 % 350°C 350°C 400°C Capacity factor 95 % 95 % 95 % 9­20 Injection temperature 40°C 40°C 40°C Well casing inner diameter 7” 7” 7” Inflation rate 3 % 3% 3% Debt rate of return 5.5 % 6.4 % 8.0 % Equity rate of return N/A 17 % 17 % Fraction of debt/equity 100/0 80/20 60/40 Plant lifetime 30 years 30 years 30 years Property tax rate 2 % 2% 2% Sales tax 6.5 % 6.5 % 6.5 % Drilling contingency factor 20 % 20 % 20 % Fluid thermal availability drawdown threshold before rework 20 % 20 % 20 %

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