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Subsurface System Design Issues and Approaches 5.3 RockFluid Interactions 23 One of the big risk areas in the longterm operation of an EGS system is the potential change in the permeability and connectivity of the stimulated reservoir with time. The fluid injected may be a combination of water from surface or shallow ground water and water naturally occurring in the geothermal reservoir. It will be cooled by the energy conversion system. As a result, the circulated water will not be in equilibrium with the minerals in the rock. With time, these minerals may dissolve or minerals dissolved in the water may precipitate, changing the permeability of the rock over time. In enhanced oilrecovery projects, rockfluid interactions have been of great importance over the life RH12Chapter 5 Figure 5.1 Vertical section viewed from the southwest showing downward growth of fractures (microseismic events) at Rosemanowes (Pine and Batchelor, 1983). 0° RH11 a 180° 55 While permeability of a fractured reservoir can be improved by increasing the injection pressure, there are two negative effects of increasing the throughput in this way: (i) fractures at higher pressures may be “jacked” open, allowing a few paths to dominate and short circuits to occur, and (ii) the critical pressure beyond which fracture growth occurs may be exceeded, extending the reservoir, allowing water to be lost to noncirculating parts of the reservoir and reducing the proportion of effective heattransfer area. At Fenton Hill, highinjection pressures were used to maintain open fractures and improve permeability (Brown, 1988) However, the fractured volume continued to grow, water was lost from the circulating system, and new fractured volume was created that was not accessed by the wells. At Rosemanowes, trying to improve fracture permeability by increasing injection pressures resulted in growth of the fracture system but away from the interwell region, exacerbating the water loss without improving the connectivity (see Figure 5.1). Depth (km) N 270° 90° 232°PDF Image | Subsurface System Design Issues EGS vs. Hydrothermal Pool
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