400kW Geothermal Power Plant at Chena Hot Springs

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400kW Geothermal Power Plant at Chena Hot Springs ( 400kw-geothermal-power-plant-at-chena-hot-springs )

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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 Figure 4: Natural Heat Loss versus electric power generation for geothermal systems A flow test of Well 5, located adjacent to the main hot springs area, was conducted on August 6th, 2005. Production rates as high as 1185 gpm were measured, which is slightly higher than the 1000 gpm production rate required for the power plant. During this test, the flowing temperature of Well 5 increased by 5 oF during the first hour of high flow and then stabilized at 167 oF. Kuster temperature and pressure gauges installed in three nearby shallow holes (TG-1, TG-3, and TG-4) showed responses varying from no appreciable response to the flowing of Well 5 (TG-3), to a decline of 30 oF in TG-1, to a temperature increase of 4 oF in TG-4. This test demonstrated the serious risk of rapid cooling in shallow production wells at Chena without proper pressure support, and that there is no barrier or separation between cooler and hotter waters in the shallow wells. To mitigate these potential problems, both production and injection wells were cased and cemented to well below the local ground water table. Additionally, production and injection zones were spaced at opposite ends of the field, 3000 ft apart. Wells throughout 10

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