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Recoverable EGS Resource Estimates 312 Our ability to create large stimulated rock volumes has certainly improved dramatically. We can now stimulate volumes of 1 km3 or more. Figure 3.2 shows the stimulated volume for past EGS experimental sites. By developing technology to control flow short circuits and methods to reduce impedances to flow when needed, the fraction of recoverable thermal energy will certainly increase as well. Chapter 3 2.5 Deep Deep Deep Phase I - Phase II - Projected 3 Soultz Shallow Soultz Soultz The recovery factor should improve with time as EGS extraction and energy conversion technology matures. The study by Sanyal and Butler (2005) suggests that recoverable energy fractions as high as 45% can be expected with economic flow rates and energy outputs. The analysis assumed an abandonment temperature that corresponds to only a 10°C temperature drop in the rock. There is evidence from 30 years of field testing that strongly suggests that hydrothermal systems achieve recovery amounts for total heat as high as or higher than 45%. 2 Phase I 2000 2005 2010 1980 1.5 0.5 Rosemanowes Phase II 1 Regarding these estimated recovery factors, it is important to note that they depend strongly on how one defines accessible reservoir volume and characterizes flow through it. 0 Fenton Hill Fenton Hill Ogachi Hijiori Pumped Soultz Basin - Cooper Projected Phase I 1980 1985 1990 1995 Year of Project Testing Figure 3.2 Total fractured or stimulated reservoir volume, as determined from microseismic data for representative EGS/hot dry rock (HDR) projects. Total Fractured Volume (from microseismicity), km3PDF Image | Recoverable EGS
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