Review of EGS and Related Technology

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Review of EGS and Related Technology ( review-egs-and-related-technology )

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4­10 EE-3A (New Well) EE-3 (Old Well) Chapter 4 Review of EGS and Related Technology – Status and Achievements 3000 3200 3400 3600 3800 4000 EE-2 (VIEW DIRECTION FROM SOUTH TO NORTH) 10,000 11,000 It appeared unlikely that additional conventional hydraulic fracturing would stimulate the necessary fracture growth, and so the team again chose to directionally redrill one of the existing wells. In September 1985, the upper well, EE­3, was sidetracked at 2,830 m and drilled to a depth of 4,018 m with BHT of 265°C, and renamed EE­3A (see Figure 4.4A). The newly drilled well intersected several of the fractures created by the hydraulic stimulation, and the connection created was acceptable for large­scale testing. -900 -700 -500 -300 -100 0 100 HORIZONTAL DISTANCE (m) PACKER 12,000 13,000 Figure 4.4A Elevation view of wells at Fenton Hill site. The data points represent microseismic events observed during stimulation. The initial closed­loop flow test of the Phase II system began in May 1986 and ran for 30 days. During the test, 37,000 m3 of water was pumped through the system, with 66% of that being recovered; another 20% was recovered during venting after the test. Flow rates were between 10.6 and 18.5 kg/s, with between 26.9 and 30.3 MPa (pascals) of pressure on the injection wellhead. The fluid extracted from the reservoir reached 192°C, with the temperature still increasing at the end of the test. Results of the flow test were encouraging and further testing was planned. TRUE VERTICAL DEPTH (m) DEPTH, FEET

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