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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 %PDF Image | Energy Sector Fundamentals
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