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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico 3.0 Enhanced Geothermal System (EGS) 3.1 Introduction Reservoir simulation is the modeling of flow behavior, be it mass, energy or momentum, to predict the future performance of the system under consideration. Typically, this is done for the prediction of the flow of oil, gas and/or water through porous media. However, the basic principles used in these simulations and the ones required for geothermal reservoir simulations are the same. In 1980 the results of a Code Comparison Study for geothermal reservoir simulators, were published (O‘Sullivan, 1985). This study, sponsored by the U.S. Department of Energy, showed that all the codes tested produced very similar results for six carefully selected idealized geothermal reservoir problems. Therefore the study confirmed that the numerical techniques for simulating the movement of heat and mass through a geothermal reservoir were satisfactory, provided that the basic physical assumptions made in setting up the mathematical model, such as the validity of Darcy‘s law, were accepted. In the following text, an overview of Enhanced Geothermal System (EGS) is provided. Also, since the main theme of this project is the utilization of CO2 as a working fluid for EGS, certain important advantages of using the same are provided. A brief review about what are important aspects in geothermal reservoir engineering, differences in geothermal and petroleum reservoir simulation is given. Finally, the approach taken towards modeling the reservoir using CMG STARSTM simulator is provided. 3.1.1 What is Enhanced Geothermal System (EGS)? In a broad sense, geothermal energy can be defined as the natural heat content of the earth. The geothermal systems can be classified under four main types (Parlaktuna, 1995): 1. Vapor dominated reservoirs: Vapor phase is the continuous phase determining the pressure regime of the reservoir, although hot water and water vapor can co-exist in this reservoir. 2. Liquid dominated reservoirs: Liquid phase is the continuous, pressure determining phase in these reservoirs. The heat recovery from theses reservoirs is higher compared to vapor dominated ones because of the boiling of the reservoir fluids and reinjection of produced fluids. 3. Geo-pressured reservoirs: These systems contain fluids having pressures higher than hydrostatic. They generally occur in the zones covered with an impermeable layer. 4. EGS (or formerly known as Hot dry rock): These systems do not contain sufficient fluid to transfer the heat to the surface. The only way to utilize these systems is to Penn State University | 3.0 Enhanced Geothermal System (EGS) 21PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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