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434 Chapter 4 Review of EGS and Related Technology – Status and Achievements 4.8.2 Lessons learned at Cooper Basin • Buried radiogenic granite heat sources are ideal in this environment. • Identifying an extensive body of granite with relatively uniform properties can yield a huge potential heat resource. • Because the granite was hydrothermally altered, it was relatively easy to drill. • Waterbased overpressure is a surprise, but it assists with stimulation and convective inflow. • It is difficult to drill multiply fractured zones without underbalanced drilling. • Subhorizontal fracture zones are present in the granitic basement (either thrust faults or opened unloading features). • Overthrust stress environments are ideal for stimulation, leading to development of horizontal reservoirs • Scaleup to multiwell systems on a large scale seems feasible, because of the horizontal reservoir development. • Scaleup should reduce cost to levels that will compete with other baseload technologies. • The utility has committed to construction of a transmission line, if economic feasibility can be demonstrated. long axis extending in the northeast direction. Habenero2 was targeted to intersect the fractured reservoir at a depth of 4,310 m, and it did hit the fractures at 4,325 m. During drilling, pressure changes corresponding to wellhead pressure changes in Habanero2 were observed in Habanero1. Some problems encountered during drilling made sidetracking necessary, and a sidetrack to 4,358 m was completed in December 2004. In mid2005, flow from Habanero2 was tested, based on the 5,000 psi artesian pressure. Flows of up to 25 kg/sec were measured, and a surface temperature of 210°C achieved. However, testing of the circulation system between the two wells has been delayed, due to lost equipment downhole progressively blocking the flow in Habanero2. During September 2005, Habanero1 again was stimulated with 20,000 cubic meters of water injected and, based on acoustic emissions data, the old reservoir was extended by another 50% to cover an area of 4 km2. From April to June 2006, a second sidetrack was attempted using a snubbing unit rather than a drilling rig. The drilling was performed with water instead of a mud system, and encountered problems with slow tripping times, continuous borehole breakout, and downhole equipment failures. The drilling was curtailed with the intention of bringing in a conventional drilling rig by late 2006 to reestablish connection of a production well to the Habanero EGS reservoir.PDF Image | Review of EGS and Related Technology
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