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III. NATIONAL ACTIVITIES EUROPEAN COMMUNITY Drilling of the second production well, GPK-4, started in September 2003 and was completed in April 2004. The trajectory of GPK-4 was defined after the stimulation of GPK-3 using the microseismic data to target GPK-4. This was the most difficult trajectory to hold as the well was 5,000 m deep with the bottom being 1,200 m to the south of the wellhead. Basic parameters of the in-situ rock mass were investigated by injection tests in GPK-3 and GPK-4. After these tests, hydraulic stimulation of the well GPK-4 was carried out. A completely new hydraulic infrastructure required for the stimulation of GPK-4 had to be designed, manufactured and installed. This included high-pressure injection and low-pressure production pipelines. The pipelines were configured in such a way to allow either the injection or the production from any of the three wells. This was done to facilitate the manipulation of the pressure in the reservoir if the necessity arose to either inflate or deflate the reservoir rapidly to control seismic activity. The stimulation was halted by an incident in the wellhead. All the three deep wells were killed and pack-off assemblies and risers were modified to alleviate the casing wellhead problems. Stimulation of GPK-4 will be restarted in early 2005. The aim is to bring a 1.5 MWe power plant on line by the second half of 2005, and to increase this to some 6 MWe in 2006. 9.2 Website for Further Information Soultz project: www.soultz.net Author: Jeroen Schuppers, European Community, Brussels, Belgium. Contact: Jeroen Schuppers; Jeroen.Schuppers@cec.eu.int IEA Geothermal R&T Annual Report 2004.doc 57PDF Image | Geothermal Energy Annual Report 2004
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