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The normalized voltage contours in the upper <br />image are interpreted from the posted <br />measurements made with boiler brush probes. <br />Their shape leads to the interpretation that the <br />graphite good juice injected in OB9 fingered to the <br />left instead of spreading out evenly. It is also <br />known that the graphite injected in OB4 fingered <br />to the left, because it was observed at OB6. <br />The observed temperature rise in the lower image <br />appears consistent with the interpretation of <br />graphite fingering. The area displaying significant <br />heating is outside the interpreted graphite finger <br />with its increased conductivity. This area is <br />substantial, about 60 feet by 25 feet. It is worth <br />noting that in a commercial scale fracture, <br />irregularities at the connections of the magnitude <br />seen here will be unimportant. <br />Normalized Voltage - Surveyed on 9/19/09 <br />x.xxx Normalized Voltage 0.80.7 0.0 <br />- Voltage Contour 0. .664 -0.4 Suspected "finger" <br />- Idealized Graphite .Oslo _ •O-, -0.8 of injected graphite <br />•15a •083 16• <br />015b 016b •16c 01 • • <br />015d - - 17e <br />T 150 893 0071 ` <br />•081 • •o?t\ I6a •17a Qq <br />?I <br />O 5 IBa O87 N- <br />•o8io <br />b62 17c <br />Known "finger" of OBI 0 <br />injected graphite . 95 0.325 Operating Resistance = 21-46 0 <br />Fracture Plane Temperature Rise - 9/21/09 <br />xx.x Temperature Rise After 8 Weeks Operation at 8.5 kW (average) <br />- Temperature Contour <br />10 •oB1s <br />- Idealized Graphite 2-•° <br />• 63 .6 <br />• 03176 •15. 2.70 <br />3.2 17s <br />24.5 26. 6.6.17 <br />Oe5 .OBI .. .' • ?[F3 009 916d •17a. <br />OB15 •? • <br />•IN J %69 •081 <br />7.9 •°o • <br />0617• 3 <br />Total Energy Input = 11.4 MW-hrs <br />Figure 18. Electrofrac EF3 voltage and temperature rise after 8 weeks of operation. <br />12. SUMMARY • An Electrofrac, or electrically continuous <br />hydraulic fracture, can be created by pumping <br />ExxonMobil's Electrofrac field testing at Colony a calcined coke and cement slurry at pressure <br />has followed phased approach, with opportunities sufficient to break the rock. <br />for learning in each phase. These field tests have <br />firmly established that: . Electrofrac power connections can be created <br />by pumping mixtures of graphite and cement <br />29th Oil Shale Symposium Page 12 of 13 October 19-23, 2009 <br />Figure 17. Three-dimensional display of temperatures at <br />Electrofrac EF3 after 8 weeks of operation.