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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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Conversely, when the production well backpressure is suddenly decreased from an elevated level of 15.2 MPa, this steep pressure gradient-region rapidly extends radially further into the body of the reservoir, effectively depressurizing and draining a significant zone of fractured rock surrounding the production wellbore. After 4 hours of continuous low-backpressure operation (following upon a longer period of high-backpressure operation), this zone of depressurized joints probably extends radially outward several tens of meters from the production wellbore. July 1995 Load Following Experiment. Starting on July 3, 1995, the Fenton Hill HDR reservoir was again tested in a cyclic production mode, but now in a much more controlled fashion than the preliminary testing done in May 1993. This series of cyclic tests was begun from a well- established steady-state, high-backpressure operating condition that had been maintained for the previous 18 days (Brown, 1996). The operating data for the precursor steady-state reservoir flow test are given in Table 2. Figure 5 shows expanded-scale profiles for the last two cycles of the LFE In flow control, the production well backpressure was continually and automatically adjusted by the control system to alternately maintain two essentially constant, but significantly different, production flow rates for these two 24-hour periods. Figure 5 Last Two Cycles of the Load-Following Experiment. 12

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