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1500 1600 1700 1800 HDR-2 F3-3 (1756 m) East West SKG-2 F2a-4 (1800 m) Review of EGS and Related Technology – Status and Achievements 1900 2000 HDR-1 Horizontal displacement (m) F2a-9 (2165 m) 2300 HDR-2a HDR-3 421 2100 Chapter 4 F3-9 (2252 m) 200 300 400 2200 2400-400 -300 -200 -100 0 100 After HDR1 was deepened to 2,205 m in 1991, the well was hydraulically fractured in 1992 to stimulate the deep fractures. Then, 2,115 m3 were injected in three stages at rates of 1, 2, and 4 m3/min. Following stimulation, HDR2a and HDR3 were deepened to 2,302 m, and a 25day circulation test was conducted in 1995. Injection was into HDR1 at 12 m3/min, while steam and hot water were produced from HDR2 and HDR3. A total of 51,500 m3 of water was injected, while 26,000 m3 of water was produced, i.e., about 50% recovery. The stress state at Hijiori prior to stimulation was found using data from compression tests of core, differential strain curve analysis, and analysis of acoustic emissions data. The maximum and intermediate principal stresses were found at a 45° angle and trending northeast/southwest, while the minimum principal stress was approximately horizontal and northsouth. Fracture apertures were measured from core in HDR3 and are shown in Table 4.1. A borehole televiewer was used to identify fracture dip and direction from HDR2a and HDR3. Figure 4.10 Hijiori wells. Red circles show intersections with major fractures. Depth (m)PDF Image | Review of EGS and Related Technology
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