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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 Development as part of the current power generation project has focused on the shallow geothermal system, and extensive testing of the resource has determined the upflow zones lies approximately 1500ft to the west of the natural hot springs area. Test wells with the highest artesian pressures and temperatures (168.9oF) were drilled in this area during 2006. Prior to 2006, drilling had focused on the area immediately surrounding the hot springs, and to the east of the springs. It has now been established from clear rollovers in the temperature depths curves that this is part of the outflow plume, and not the source of the upflow. Figure 15. Shallow Geothermal Map of the Chena Hot Springs System 7.2 Geothermal Production Well Completion and Testing The first production well for the power plant, Well #6, was drilled adjacent to the hot springs area at a depth of 130ft. However, this well was abandoned once a clearer model of the shallow reservoir (see Figure 12 above) was established. A second production well was drilled in May and June 2006, to a depth of 713ft. After completion, Well 7 was flowed on July 8th, 2006 for 7 hours and 55 minutes at rates of 240, 186, and 87 gpm. The total production was 91,000 gallons. A detailed static log Kuster log was run with stops every 2 meters in Well 7 before flow commenced. After the well was flowing, the downhole pressure changes associated with start of flow, flow rate changes, and shut in were monitored with the Kuster tool. Additionally, two traversing logs were run in the lower part of the well during flow to document in detail the locations of the fluid-entry points with differing temperatures. This was useful in 23PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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