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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 planning final cementing of the casing to exclude shallow (and cooler) fluid entry zones and isolate the producing geothermal fractures. Because the well was flowed at three different rates during the July 8th test (Table 1), three productivity values can be calculated. The downhole productivity data are linear, and the overall productivity of the well between zero flow and 240 gpm is 15.6gpm/psi. Date Flow Rate(gpm) Downhole Pressure (psi) 321.3 316.8 309.6 305.9 Change in Pressure (psi) 16.2 0 4.5 11.7 15.4 Productivity Index (gpm/psi) 13.58 0 19.33 15.90 15.58 July 5, 2006 220 July 8, 2006 0 July 8, 2006 87 July 8, 2006 186 July 8, 2006 240 Table 2: Well 7 July 2006 Productivity Data From this test, we rate of 1000gpm, which is required for power plant operation. This allowed us to select a pump and determine what depth the pump should be set at to prevent cavitation. A 40hp submersible Franklin Electric motor with a Flowserve Model 10EHL single stage submersible turbine pump was selected, with a VFD controller. A backup pump, capable of supplying 400gpm, will also be installed in nearby TG-8 in case of primary pump failure. Actual drawdown in the production well was measured to be 90ft after the pump was installed. 7.3 Geothermal Supply Pipeline Installation of 3000ft of 8in insulated HDPE was completed at the end of July. The line was laid in a shallow ditch along 90% of the route, and will eventually be buried. The pipeline follows an existing unimproved road along the south boundary of the Chena Hot Springs Resort Property. 1.8oF is lost in the pipeline between the production well and the power plant. were able to estimate a drawdown of 148ft in the well at the production 24PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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