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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico producers split from a single surface hole). This configuration is peculiar to demonstration projects as it provides the most effective and lowest-cost access to a deep reservoir. However, for large-scale development, this configuration is likely to be supplanted by other well configurations [Figure 18]. Typical within the petroleum field is the repeating ―five-spot‖ pattern (Pruess, 2006). This regular grid is common in shallow regular reservoirs but is disadvantaged where the reservoir is deep as it requires multiple deep wells to access the reservoir zone. Alternative configurations are to examine vertically stacked reservoirs (Elsworth, 1989) or horizontally aligned reservoirs, now feasible with advances in horizontal drilling technology. It is not clear whether drilling technology in hard rock is sufficiently advanced to allow the latter. Figure 18: Five spot, and vertically and horizontally stacked reservoir configurations. 3.5.2 Thermal drawdown analysis Somewhat independent of the well configuration thermal drawdown within the reservoir may be evaluated with knowledge of the thermophysical properties of the reservoir rocks and circulated fluid and the geometry of the transport connections within the reservoir. For first order analysis spherical reservoir and parallel flow models are reasonable candidates to represent behavior [Figure 19]. The spherical reservoir model (SRM) assumes that both the reservoir and circulated fluids are at thermal equilibrium with temperatures augmented by heat supply from the far-field by conduction (Elsworth, 1989a&b). This model gives adequate estimates for heat supply where fracture spacing within the reservoir is small but overestimates thermal output where spacing is large. Where fracture spacing is large the parallel fracture model (PFM) provides better estimates of thermal output and of thermal drawdown although the boundary of the reservoir is assumed thermally isolated and no supplemental heat supply is possible (Gringarten and Witherspoon, 1973; Gringarten et al, 1975). In practice this latter constraint is of second-order importance and thermal drawdown may be evaluated from knowledge of the previous thermophysical properties supplemented by reservoir volume, fracture spacing and fluid throughput (Elsworth, 1990). Penn State University | 3.5 Simplified Thermal Drawdown Calculations 35PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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