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3.3 Metrics that Influence the Recoverable Resource Recoverable EGS Resource Estimates 36 Chapter 3 3.3.1 Temperature The EGS resource base heatinplace estimates developed in Chapter 2 are made by assuming a volume of rock with an average rock density, heat capacity, and a minimum reference temperature. For this assessment, the average surface temperature was used to define the minimum reference temperature. To determine the amount of that heat that can be mined, it is also necessary to include several other important parameters. The initial temperature of the rock at depth determines not only how much thermal energy is in place, but also the rate at which it can be recovered. In addition, a final useful production temperature must be specified for that application. This temperature is referred to as the “abandonment temperature” and represents the average temperature of the active reservoir rock volume at the time heatextraction operations cease. The volume of rock that can be fractured and the average spacing between the fractures, along with their length and width, will control the effective heatexchange area of the reservoir. These, in turn, will determine the rate of energy output and the life of the reservoir. Reservoir volume and the effective surface area available for heat transfer will also affect the fraction of the thermal energy stored in the reservoir that can be extracted over time. The rate at which water – the heat transfer medium – is circulated through the system is a critical parameter. The flow pattern of water between injection and production wells controls how much of the fractured volume is actually swept by the circulating fluid. The permeability and porosity of the fractured volume determine the amount of water stored in the rock, as well as how fast it can move through the rock and with what amount of pressure drop. The circulating water exists at a representative temperature that is taken to be the average temperature of the rock. Also important, the actual flow pattern of fluid in the reservoir is influenced by the spatial distribution of permeability and porosity, as well as the relative positions of the production and injection wells. (31) The resource base figures in Chapter 2 represent the total stored thermal energy in place, relative to the ambient regional surface temperature, To. We can define the recoverable fraction of that thermal energy, Fr, as a function of several independent or specified variables, such that:PDF Image | Recoverable EGS
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