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Review of EGS and Related Technology – Status and Achievements Chapter 4 411 During venting in the first flow test on the system, the casing and liner in well EE2 at 3,200 m suffered a partial collapse. It was decided that the best way to fix the leakage caused by the collapse was to seal off the well just above the collapse, and redrill the well from that point. The redrilling took only 30 days to drill 800 m, progressing at a rate 2.5 times faster than the rate drilled in 1978 and 1979. The redrilled wellbore was renamed EE2A to distinguish it from the earlier well. Following recompletion of EE2A, flow testing was conducted in 19891990 to obtain data for planning the longterm flow test. Tests conducted at equilibrium pressures did not have the high loss of fluid that had been experienced at pressures above the fracture breakdown pressure, which had been found to be less than 19 MPa. Also at pressures below the critical pressure, the reservoir did not continue to grow. While temperature in the produced fluids changed over time, the downhole temperature did not change measurably during the testing. Other testing maintained pressurization of the reservoir by cyclically injecting fluid while sustaining wellhead pressure on the production well (Duchane, 1993). The facility for the longterm flow test was constructed, starting in 1990, while shorter flow tests continued. Several pieces of equipment were installed for this phase of testing, including a heat exchanger to dump waste heat from the produced fluid, larger makeup water storage ponds, and larger capacity makeup water pumps and injection pumps. The first stage of the longterm flow test of the Phase II system started on April 8, 1992. The test continued for 112 days, until failure of the injection pumps necessitated shutdown on July 31. Cold water was injected at 12.515 kg/s (90110 gpm) and produced at temperatures of more than 180°C (Duchane, 1993). During the first stage of testing, the pumps were of the reciprocating type driven by diesel engines; but, for the second stage of testing, the pumps were centrifugal and driven by electric motors. This test lasted 55 days with constant downhole temperatures. However, surface temperatures dropped, possibly because low flow rates resulted in heat loss to a shallow, cooler subsurface region. During the latter phases of work at Fenton Hill, support for the work had declined to the point where it was not possible to maintain sufficient technical staff to perform continuous flow testing of the reservoir – nor was it possible to perform the necessary redrilling and wellbore repairs to upgrade the downhole connections to the large fractured system that had been created (see Figures 4.4A and 4.4B). With prospects for continued funding very low, all field experiments were terminated at the Fenton Hill site by 2000, after which the site was decommissioned.PDF Image | Review of EGS and Related Technology
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