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The Future of Geothermal Energy

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The Future of Geothermal Energy ( the-future-geothermal-energy )

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8500 8600 8700 8800 2600 Chapter4 ReviewofEGSandRelatedTechnology–StatusandAchievements EE-1 FIRST FLUID POINT MAIN CONNECTIONS FRACTURE REGION FIRST FLUID POINT TARGET PLANE GT-2B GT-2 ORIGINAL GT-2A FRACTURE ORIGIN 50 m 2700 8900 4-9 9000 9100 9200 2800 0 100 200 HORIZONTAL SEPARATION (ft) Figure 4.3 Elevation view of wells EE-1, GT-2, GT-2A, and GT-2B at the Fenton Hill site during Phase I testing. Between June 1977 and December 1980, five circulation experiments were conducted in the Phase I system, lasting for 417 days. The water run through the system produced between 3 and 5 MWt, and powered a 60 kW binary fluid turbine generator. In April 1979, drilling began on a new set of wells, EE-2 and EE-3, to be drilled deeper than the other wells. The wells were directionally drilled at about 35° to a vertical plane, and separated by 380 m vertically. The deeper of the two, EE-2 reached a depth of 4,390 m and BHT of 327°C. From 1982- 1984, the wells were then hydraulically fractured at multiple depths. In all these (and subsequent) experiments, the progress of fracture growth was followed by microseismic event monitoring. The reservoir created by these experiments did not grow in the direction predicted, and an inadequate connection was established between the two wells. It was determined that this was caused by an unanticipated shift in the stress field in the deeper part of the formation – a major finding from this phase of the project. DEPTH (ft) DEPTH (m)

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