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• <br />7. INJECTION PROCEDURES <br />The surface processing facilities contain a series of tanks and valves that can direct <br />produced oil and fuel oil to the heater-producer well. The rate and pressure of the heater- <br />producer well fluids will be varied during the Pilot Test to determine optimal working <br />conditions. <br />8. CONSTRUCTION DETAILS <br />The heater-producer well design includes an 113/4-inch casing centered and cemented <br />inside anl8-inch well bore from surface to the roof of the mining interval (top of the R1). <br />This cased and cemented portion includes all of the overhead groundwater bearing zones. <br />Double walled, vacuum-insulated-tubing (VIT) will be placed, and centered, inside the <br />113/4-inch cemented casing. All gases and liquids will be transported through concentric <br />tubing inside the VIT. <br />Oil shale begins retorting (generating oil and gas from kerogen) above 200°C. The <br />hottest planned operating temperature inside the heater-producer well is below that 200°C <br />minimum retorting temperature. Heat transfer calculations using vendor-supplied <br />insulation values indicate that the maximum temperature of shale surrounding the heater- <br />producer well is only about 80°C after six months of conducting 200°C fluids. After one <br />year of continued heating, the maximum temperature is calculated to be less than 100 T. <br />If it becomes advantageous to produce or reflux fluids in the heater-producer well at a <br />temperature greater than 200°C, temperature monitoring will confirm that the heater- <br />producer well is not capable of retorting the well bore oil shale. Heat transfer <br />calculations using vendor-supplied VIT insulation values indicate that the shale <br />surrounding the well is heated to less than 140°C after a full year of conducting 350°C <br />fluids. <br />Consequently, AMSO feels that the insulation provided by the VIT, the space between <br />the VIT and the 113/4-inch cemented casing, and the three inches of cement outside of the <br />casing will provide thermal containment of hot fluids transported through the tubing <br />within the VIT. <br />Also, the redundancy provided by dual-wall of the VIT, the casing, and the cemented <br />annulus is considered adequate to contain any liquids (potential contaminants) within the <br />heater-producer well. <br />Please see Figure 6-2 for a detailed depiction of the heater and well completion within the <br />retort. Please see Figure 8-1, and accompanying description, for the heater-producer well <br />drilling plan. <br />0