Hot Dry Rock Geothermal Energy Development in the USA

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Table 3 presents the reservoir performance data for the sixth cycle of the LFE. As shown in Table II, the actual mean flow rates for the sixth cycle were 9.25 l/s for 4 hours at a production temperature of 189°C, followed by 5.83 l/s for the subsequent 20 hours at a production temperature of 183°C. The peaking flow rate for the sixth cycle indicates a production flow enhancement of 59% over the baseload level of 5.83 l/s. When the higher temperature of the produced fluid is factored in, the corresponding increase in thermal power during the 4-hour enhanced production period was 65% over the baseload level of 3.72 MW The time required to increase the reservoir power output from the baseload to the peaking rate was about 2 minutes. The average production flow rate of 6.42 l/s for the last 24-hour cycle was 3.9% greater that the steady-state level of 6.13 l/s existing on the morning of July 3, just prior to beginning the 6-day LFE. Similarly, the mean production temperature was 183.9°C, up slightly from the 182.7°C level existing on July 3. These average flow and temperature levels during cyclic operation show that there was also a meaningful overall enhancement in reservoir performance, due to the cyclic operation of the reservoir per se, when compared to preexisting steady-state levels at a constant backpressure of 15.2 l/s During the 1995 testing, this enhancement due to cyclic operation was almost enough to compensate for the previously measured steady-state flow decrease resulting from an increase in backpressure from 9.65 to 15.2 MPa, and the accompanying decrease in reservoir driving pressure (see Figure 6). Figure 6 The Variation of Production Flow Rate with Backpressure for an Injection Pressure Level of 27.3 MPa, as Measured During the LTFT. 13

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