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4.7 Soultz Chapter 4 Review of EGS and Related Technology – Status and Achievements 4.6.2 Lessons learned at Ogachi 426 • While efforts to stimulate the two wells resulted in reservoir growth, they did not result in better connectivity between the wellbores. The experience gained at Ogachi – in attempts to fracture between two wells – reinforced observations at Fenton Hill, Rosemanowes, and Hijiori. These projects showed that drilling, stimulating with acoustic emissions, mapping, and then drilling into the fracture cloud yielded the best connection between injector and producers. 4.7.1 Project history • The complex geologic history at Ogachi made it difficult to predict the direction of fracture growth. • The stress state in the original boreholes was not well understood until borehole televiewer data was collected and analyzed after the wells had been stimulated. • Drilling OGC3 into the mapped fractures from acoustic emissions analysis resulted in a significant improvement in connectivity between the wells. • Efforts to connect the original two wells at Ogachi by stimulating the production well were unsuccessful, after the initial attempts to connect by stimulating the injection well failed. • Fluid losses to the reservoir were high during injection testing, because the wells were not well connected. Once OGC3 was drilled into the stimulated area, connection was improved and fluid loss was reduced. • Stress changes with depth in the boreholes (found with borehole televiewers and from improved analysis of the acoustic emissions data) allowed the change in stress direction with depth in the reservoir to be determined. As a result of the interest generated by the Fenton Hill project, several European countries began experiments along similar lines. Besides the U.K. project at Rosemanowes, Germany supported two projects – a shallow experiment at Falkenberg, and a deep (4,500 m) single borehole project at Bad Urach. France ran an experiment in 800 m boreholes at Le Mayet in the Massif Central and, together with Germany, began a paper study in the mid1980s of the potential of a site at SoultzsousForêts in the Upper Rhine Valley (Figure 4.5). As the latter is the site of the former Pechelbron oilfield, the geology was very well characterized, down to about 1,500 m (the top of the granitic basement), and temperature gradients in the upper 1,000 m were known to exceed 110°C/km. Because HDR technology (as it was then known) was expected to be fairly generic – and the cost of such largescale experiments is generally quite high – there was general agreement that it would make more sense to pool both financial and manpower resources on a single site. The goal was to develop a European project that eventually would lead to a commercial demonstration. Under the coordination of the European Commission, a detailed comparison was made of the suitability of the three major European sites (Rosemanowes, Bad Urach, and Soultz); and, in 1987, the decision was made to locate the project at Soultz. Funded initially by the European Commission and relevant energy ministries of France, Germany, and the United Kingdom, a permanent base wasPDF Image | Review of EGS and Related Technology
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