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6.4.2. Casing Cement Processes <br />Surface (conductor) casing will be set in cement by placement of cement directly in the annulus <br />of the conductor or by a tremmie pipe. Conductor casing cement will be Type I /II premium <br />plus cement. <br />Casing in all other wells will be cemented by displacement. With the displacement method, the <br />intermediate casing is installed to "I'll then lifted a few feet off bottom to create a fluid pathway <br />between the interior and exterior of the casing. Cement is next applied inside the casing and <br />capped with a wiper plug. Water is then added to the column above the plug, providing weight <br />that drives the cement down the casing and up the annulus until cement returns are observed at <br />the surface. <br />All wells — heater (leaching) and observers — will be cemented with Premium Plus + 60% SSA -1 <br />(with an 11.5 lbs /gallon (ppg) lead, and a 13.5 ppg tail). Once cement returns are observed at the <br />surface, the cement will be allowed to set for the prescribed setting time (usually 8 hours). <br />A cement bond log will be run in all wells after cementing. The cement bond log is an acoustic <br />geophysical measurement that indicates the presence of cement as a measure of the degree of <br />bonding in the annulus between casing and the drilled hole. <br />6.4.3. Conductor Casings <br />Conductor casing will be installed at all wells. Conductors for heater (and leach) holes are 14 in., <br />drilled to 40 -60 ft depth (more or less depending on depth to bedrock) and penetrating 3 ft <br />minimum into bedrock. <br />Conductor casings for the heater (leaching) wells will be 10 in. O.D. (40.5 lbs /ft, H -40 Grade <br />steel, STC). Casing will be cemented from T.D. to surface with type I /II neat cement, placed in <br />the annulus via tremmie pipe. <br />Conductor casings for the observer wells will be 7% in. O.D. (26.4 #, J -55, STC steel casing). <br />These also will be drilled to 40 -60 ft depth (more or less depending on depth to bedrock) and will <br />penetrate a minimum of 3 ft into bedrock. Casing will be cemented from TD to surface with <br />type I /II premium plus cement, placed in the annulus via a tremmie pipe. <br />Conductor casing at the SAW -1 well is installed already under separate permit and separate NOI <br />with the MLRB. <br />6.4.4. Leach Well <br />The nahcolite dissolution hole (Figure 31) will be drilled through the TI bed with additional <br />depth to accommodate a sump up to —50 ft deep. The leach well will later be converted to a <br />heater well and upon conversion will become the center of a hexagon of heater wells. Nahcolite <br />leaching will be accomplished by hot water injection via a single tubular and recovery via an <br />adjacent tubular. Depths of the injector and producer tubular will be adjusted periodically to <br />Notice of Intent 37 Shell Frontier Oil & Gas Inc. <br />December 2010 <br />