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Hot Dry Rock Geothermal Energy Development in the USA

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Hot Dry Rock Geothermal Energy Development in the USA ( hot-dry-rock-geothermal-energy-development-the-usa )

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INSERT FIGURE 2-SPE PAPER Figure 2. ThePhase II HDR reservoir at Fenton Hill, NM. The reservoir is ellipsoidal with its major axis tilted about 30° from the vertical. It is centered at a depth of about 3660 m, and has an effective volume of appproximately 16 million m3. The experience of five years of drilling, fracturing, and redrilling led to a complete change of thinking in regard to the nature of the fractures produced in HDR reservoirs. Extensive microseismic analyses and geologic evidence had indicated that the original concept of vertical flow passages created by actually forming new fractures in the basement rock was incorrect. Instead, all the evidence pointed to the opening of existing, but previously sealed, joints. As might be expected, the initial joint openings were found to occur in a direction approximately orthogonal to the least principle earth stress. Simple geometric evidence indicates that the Phase II reservoir has a flow-connected volume of about 16 million m3, and is ellipsoidal in shape, with axes ratios of approximately 3, 2, 1, respectively (Winchester 1992). The longest axis tends north-south, the shortest axis lies in an approximately east-west direction, and the intermediate axis is tilted approximately 30° from the vertical. The reservoir is penetrated by two wellbores, each of which terminates in an open-hole zone approximately 300 m in length. The distance between the two wellbores at the open-hole depth averages 110 m. The Fenton Hill Surface Plant. Between 1987 and 1991, a surface plant, designed to meet power-industry standards and capable of extended operation, was constructed and mated to the large HDR reservoir. Figure 3 shows the principle components of the surface plant. 5

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