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Since the fracture job at EF1 did not deliver slurry <br />to the mine rib, EF3 was pumped at a higher rate, <br />pressure, and treatment volume. Photographs of <br />the fracture job at EF3 are shown in Figure 9. The <br />job utilized two HT400 pump trucks and a boost <br />pump. Solids were mixed off site, arrived by <br />truck, and were mixed with water in the batch <br />mixer. Just over 100 barrels of slurry were <br />preceded by 150 barrels of gelled water. The job <br />was pumped at 18 bbls/minute, and, as indicated <br />above, the job did deliver coke-cement slurry to <br />the crosscut mine rib. <br />EN -0137 Camera/Core EN -0132 Core/Electrical EF3 Coke at Crosscut Rib <br />s <br />M <br />f" <br />Continuity Probe (7/18/08) <br />• 14:34:48 Resistivity of coke recovered <br />from core is 1-4 Q-cm (similar <br />to lab values) <br />rtgure tU. Electrotracs observed in core, on a borehole camera, electrically, and on the mine rib. <br />Figure 10 shows observations of the two coke- <br />filled Electrofracs. The photos on the left show the <br />EF 1 fracture observed in core and with a borehole <br />camera in the same hole (arrows indicate the coke- <br />filled fracture). The middle photos show that coke <br />recovered from core is electrically conductive. <br />Resistivity measurements on samples of recovered <br />coke yield values similar to laboratory <br />measurements. The upper right photo shows coke <br />slurry flowing from the crosscut rib after the EF3 <br />fracture job. Finally, the lower right photo shows <br />an electrical probe used in the initial verification <br />of electrical continuity at EF1. The probe is <br />actually a copper scouring pad with a wire <br />attached to it. The probe is conveyed into the hole <br />on PVC pipe. When it contacts coke in the <br />fracture, electrical continuity is demonstrated by <br />an analog ohmmeter whose needle moves <br />dramatically. More recently, brass boiler tube <br />brushes have been used as probes. They're equally <br />effective and somewhat more rugged. These <br />electrical probes have clearly demonstrated that <br />EF 1 and EF3 are electrically continuous. In all <br />twenty-eight observation holes, every time a probe <br />has been placed in contact with one of the <br />Electrofracs, it's been shown to be electrically <br />continuous, both with the casing through which <br />the fracture was pumped and with other <br />observation-hole penetrations. <br />29th Oil Shale Symposium Page 7 of 13 October 19-23, 2009