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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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Figure 1. An HDR heat mining system. Water is circulated around a closed loop to extract thermal energy from an engineered geothermal reservoir and deliver it to a power plant on the surface. A high-pressure injection pump provides the sole motive force. The injection pump provides the sole motive force for moving the water continuously around the loop to mine energy from the reservoir and deliver it to a power plant on the surface. The hydraulic pressure applied via the injection pump also serves to keep the joints within the reservoir propped open (Brown 1991). The operating parameters applied to the injection pump thus greatly affect both the flow rate through the reservoir and its instantaneous fluid capacity. By using a combination of injection and production control measures, an almost limitless variety of operating scenarios may be employed to mine the heat from an HDR reservoir HDR RESERVOIR DEVELOPMENT AND INITIAL TESTING AT FENTON HILL Numerous hot springs and other geothermal features provide evidence of the high heat flow in the Jemez Mountains of northern New Mexico, an area dominated by the Valles Caldera, a dormant volcano. Field work to demonstrate the HDR concept began in 1971 with reconnaissance heat flow measurements in various parts of the Jemez Mountains, followed in 1973 by a series of hydraulic fracturing experiments in a 730-m-deep exploratory borehole on the western flank of the caldera. In 1974, a permanent test facility was established at Fenton Hill, about 60 km by road west of Los Alamos. The Fenton Hill site lies about 2.8 km west of, and outside, the ring fault structure of the Valles Caldera that defines the boundary of recent (60 000 years ago) resurgent volcanic activity. The basement rock at a depth of 2400 to 4200 m beneath the surface of Fenton Hill is composed of 2

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