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ExxonMobil has advanced its research and development of the ElectrofracTM process by <br />conducting certain small scale experiments in the field at the Colon Shale Oil Project in <br />Garfield County, Colorado. Under Technical Revision No. TR-11, ExxonMobil constructed <br />two electrically conductive fractures in the Mahogany zone and heated one of them at low <br />temperature for three months (the "ElectrofracTM Construction Test"). This experiment <br />successfully demonstrated that a continuous electrical heating circuit (an "Electrofrac heater") <br />could be constructed and sustained. During the test, temperatures were maintained well below <br />those necessary to produce oil and gas. The Electrofrac Construction Test is summarized <br />below. <br />ExxonMobil seeks approval of this Technical Revision to continue its research and development <br />of the ElectrofracTM process at the Colony site. As part of the work to be performed under this <br />Technical Revision, the company plans to conduct additional field tests to assess the robustness <br />of the ElectrofracTM process. <br />4 TR-11 was approved by the Division of Reclamation, Mining and Safety (DRMS) on <br />October 15, 2007. <br />#1445022 vl den <br />Figure 1. Electrofrac process schematic.