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success. GPK4 had been subject to three different types of acidization treatments with some success. Circulation began at the beginning of July 2008 and lasted until mid-August 2008. During this period, the pump-assisted production from GPK2 was around 25 l/s with a backpressure of 2 MPa. The production fluid temperature at the surface reached 163 °C. The heat was extracted using a heat exchanger before being re-injected in GPK3. The wellhead injection pressure in GPK3 started at 6 MPa and increased faster initially but then slowed down and settled at 7 MPa during the last week of the test. The reinjection temperature varied from 40 °C to 110 °C, depending on the cooling capacities. Approximately 190 microseismic events were located during this test and the event rate was comparable to that observed in the 2005 circulation test. They also occurred in much the same locations as the earlier events, just below the GPK3 and GPK4 bottom of well, but the magnitudes did not exceed ML 1.4, compared to those generated in 2005, which included events in excess of ML 2.0. This may reflect differences between the two tests. In 2005, using the buoyancy effect in the production well the circulation test lasted for 6 months compared to 2008 where circulation was assisted by the use of a line shaft pump in the production well during a period of only 2 months. 3.2.2 November-December 2008 Circulation Test The circulation test of November-December 2008 was performed after the installation of the second production pump (ESP - Electro-Submersible Pump) into GPK4 and the re-installation of the LSP into GPK2. The ESP (GPK4) was started on 17 November first, followed by the LSP (GPK2) one week later. Unfortunately, the LSP encountered problems and had to be stopped. It was restarted on 1 December 2008, and the circulation test (which involved all three deep wells) continued until 17 December, when the test had to be stopped due to technical problems. The production flow in GPK2 was around 17 l/s with a surface temperature of 163 °C at the end of the test. Production from GPK4 started at around 17 l/s and quickly deceased to a steady value of around 12 l/s with a final production temperature of about 155 °C. Wellhead pressure in both wells was maintained at 2 MPa in order to prevent scaling. At the beginning of the test, that is when only GPK4 was producing, the re-injection into GPK3 was at around 17 l/s, then declined to about 12 l/s as the wellhead pressure increased to 2.8 MPa. When the second well (GPK2) was put in production, the reinjection flow rate rose to 27 l/s and the wellhead pressure was increased up to 8.6 MPa. Work is continuing on the analysis of the data and the interpretation of the results. 3.3 Work Performed in 2010 Many of the Task activities were revised during 2010. As a consequence of reduced funding from various participating organizations, efforts on Task related projects were much reduced. It is expected that this will pick up in the future as more funding becomes available. 3.3.1 Task A- Geothermal Energy Resource, Reserve & Depletion (Production Profile) Estimates The major effort in this Task involved its re-establishment with new objectives (see Section 3.1.1 above). The work on redefining economic related parameters has started and is continuing. It is recognised that assessment of geothermal resources has to be comparable in an international scenario in order to encourage investment. A new task leader is being sought with enough experience to lead this important task. 55PDF Image | Geothermal Research and Tech IEA
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