Review of EGS and Related Technology

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4­12 3300 3700 4100 Looking North Looking West Chapter 4 Review of EGS and Related Technology – Status and Achievements 400 0 EE-2 400 400 800 3100 Experiment 2066 East (m) 800 400 0 EE-3A Looking Down EE-3A EE-2 EE-2 800 400 0 400 800 400 0 400 4.3.2 Lessons learned at Fenton Hill Horizontal Distance (m) Horizontal Distance (m) Figure 4.4B Fenton Hill microseismic event locations during stimulation of EE­3A, on January 30, 1986 (Los Alamos National Laboratory). Depth (m) North (m) • Deep (15,000 ft, ≈5 km), high­temperature wells can be completed in hard, abrasive rock. • Low­permeability (microdarcy or lower) crystalline rock can be stimulated to create hydraulically conductive fractures. • Conventional drilling methods can be adapted for the harsh environments encountered in reaching zones of rock at about 200°C to 300°C, which are hot enough to be suitable for commercial power production. • Hydraulic­pressurization methods can create permanently open networks of fractures in large enough volumes of rock (>1 km3) to sustain energy extraction over a long time period. • The EGS reservoir can be circulated for extended time periods and used to generate electricity. • Creating the connection between wells was a crucial step in developing the EGS reservoir. • Connection was easier to establish by drilling into the fractured volume, once it was stimulated and mapped. • Directional drilling control was possible in hard crystalline rock, and the fractures mapped by microseismic monitoring could be intersected using directional drilling. • The Phase I reservoir, although too small by design for commercial operation, provided a test­bed for creating the larger volumes needed to achieve commercial rates of production.

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