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The main geothermal production well was drilled to a depth of 713 ft in May and June, 2006 based on data from the test wells. Three productivity values for the well were calculated during separate flow tests, and the overall productivity of the well is approximately 15.6 gpm/psi. From this value, we were able to estimate a drawdown of 148 ft in the well at the production rate of 1060 gpm, which is required for power plant operation. This allowed us to select a pump and determine at what depth the pump should be set (220 ft) to prevent cavitation. A 100 hp submersible Centrilift pump was selected, with a VSD controller. A backup pump, capable of supplying 500 gpm, will be installed in 2007 in a nearby well in case of primary pump failure. The hot water is delivered to the power plant via a 3000 ft length of 8 in insulated HDPE. 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. A maximum of 1.8 oF is lost in the pipeline between the production well and the power plant during the winter months. Developing a successful injection strategy is integral to the success of any large scale geothermal project. Chena has been working on characterizing its wells for nearly 2-1/2 years, largely in anticipation of minimizing the stresses placed on the reservoir due to increased production necessitated by the power generation project. Initial injection well candidates were chosen primarily due to their distance from the proposed production area and the natural hot springs. However, additional testing showed that while these wells are unequivocally linked to the geothermal system/reservoir, they have low injectivity indexes which make them poor candidates for injection of any substantial volume of fluid under the low wellhead pressures planned. Currently, Chena is using a single injection well located near the power plant building. This well has a total depth of 702ft, and injection testing conducted in December 2005 indicated a very high injectivity index which has subsequently been verified through actual injection of spent fluid. The well was cemented in July, 2006 and has been used successfully for injection ever since the first unit began operating. The geothermal field is still being monitored, and changes to the injection strategy over the long term is expected in order to minimize cooling of the resource. No cooling has been observed to date in produced fluid, and temperature increases of up to 8 oF have been observed in holes near the production well. Unfortunately, the injection well is located only 500 ft upstream of the shallow district heating supply well, and temperature declines have been observed in this hole. As a result, the district heating well will be abandoned in 2007 and the heating system subsequently supplied directly by the discharged fluid from the power plant in combination with low volumes of hotter waters from the main hot water supply line for the power plant. INSTALLATION OF UNITS The first power plant module was delivered to Chena Hot Springs on July 8th, 2006, and officially began operation on August 20th when the official ribbon cutting ceremony was conducted. 1400 people were on hand to celebrate the grand opening. The second ORC power plant module was delivered in mid-November, 2006 as scheduled. It was brought online December 16th, 2006. The installation of the second unit was completed almost entirely by the crew of Chena Power, with UTRC and UTC Power representatives onsite 5PDF Image | Chena Hot Springs 400kW Geothermal Power Plant
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