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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico even for widely spaced fractures (100m) and reservoir lifetimes (50% drawdown) are congruent for SRM and PFM as of the order of 20-50y. Thus, limiting rates of circulation (100 kg/s), reservoir volumes (one-eighth of a cubic kilometer) and fracture spacing (<100m) are defined as feasible for reservoir lifetimes of the order of 30 years. These estimates are consistent with observations scaled from other demonstration projects, most notably the drawdown rates observed at Fenton Hill (USA) and at Rosemanowes (UK) as illustrated in Figure 21. Figure 21: Scaled rates of drawdown for recovery at 1000 and 100 kg/s for the prototypical reservoirs considered here and for prior demonstration projects at Fenton Hill (USA) and at Rosemanowes (UK) (Elsworth, 1990). 3.6 CO2 Corrosion A review from oil and gas industries shows that carbon dioxide systems are one of the most common environments where corrosion occurs. Carbon dioxide forms a weak acid known as carbonic acid (H2CO3) in water, a relatively slow reaction. However, CO2 corrosion rates are greater than the effect of carbonic acid alone. Cathodic depolarization may occur, and other attack mechanisms may also be at work. The presence of salts is relatively unimportant. Corrosion rates in a CO2 system can reach very high levels (thousands of mils per year), but it can be effectively inhibited. Velocity effects are very important in the CO2 system; turbulence is often a critical factor in pushing a sweet system into a corrosive regime. This is because it either prevents formation or removes a protective iron carbonate (siderite) scale. Conditions favoring the formation of the protective iron carbonate scale are elevated temperature, increased pH (bicarbonate waters) and lack of turbulence. Magnetite scales are also formed in CO2 systems, and corrosion product scales often consist of layers or mixtures of siderite and magnetite. CO2 corrosion products include iron carbonate (siderite, FeCO3), Iron oxide, and magnetite. Corrosion product colors may be green, tan, or brown to black. Penn State University | 3.6 CO2 Corrosion 38PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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