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422 Pressure Bulk testing modulus, K 0.2 2 Chapter 4 Review of EGS and Related Technology – Status and Achievements Table 4.1 Determination of reservoir volume at Hijiori and Ogachi using different methods (Kruger, 2000). Method Condition Upper Lower Upper Lower Tracer Modal Vol./ testing Porosity 0.2 35 Prior heat For whole extraction reservoir 0.7 6.3 0.14 1.8 modeling Estimated Volume, 10 m Hijiori Ogachi Reservoir Reservoir Reservoir Reservoir Swept Low Est. 6.3 0.75 geometric flow volume High Est. 20 6 3 8 Microseismic Events >1.5 0.012 0.651 events volume 1 envelop 1 3.7 10 During 1996, further stimulation and shortterm testing was conducted to prepare for a longterm test. In an attempt to better connect the HDR3 to the injection well HDR1 in the deep reservoir and reduce the amount of fluid loss, HDR1 was used as injector while HDR3 was produced and back pressure was held on HDR2a. While there was no marked improvement in the connectivity, this experiment held out the hope that modifying the pressure in the reservoir could have an effect on the results of stimulation. This is an area where more work is needed (Hori et al., 1999). Following additional circulation tests in 1996, a longterm test of the deep and shallow reservoirs was initiated in 2000 with testing continuing into 2002 (Schroeder et al., 1998; Tenma et al. 2000, 2001). A oneyear circulation test of the deep reservoir was conducted with injection of 36°C water into HDR 1 at 1520 kg/s. For the second phase of testing, injection into SKG2 allowed testing of both the deep and shallow reservoir. Production of steam and water was from HDR2a at 5 kg/s at about 163°C, and from HDR3 at 4 kg/sec at 172°C. Total thermal power production was about 8 MWt. At the end of the test, the flow was used to run a 130 kW binary power plant. Test analysis showed that production was from both the deep and shallow reservoir (Matsunaga et al., 2000). During the test, scale problems in boreholes necessitated cleanout of the production wells. One interesting result of the test is that, while the injection flow rate remained constant at about 16 kg/s, the pressure required to inject that flow decreased during the course of the test from 84 to 70 bar. Total production from HDR2a and HDR3 was 8.7 kg/s with a loss rate of 45% (Okabe et al., 2000). Well HDR2a cooled dramatically from an initial temperature of 163°C to about 100°C during the longterm flow test. The test was finally halted, due to the drop in temperature. The measured change in temperature was larger than that predicted from numerical modeling (Yamaguchi et al., 2000).PDF Image | Review of EGS and Related Technology
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