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History Well 29-28 • • • Well 29-26 History Location •. Southeast corner of Section 29, T1 S, R97W, 6~'' PM Coordinates Northing 11,789.08, Easting 12,872.95 Collar Elevation 6219.7 ft amsl Duration of Drilling May 22, 1998 through June 9, 1998 Total Drilled Depth 2133 ft Summary Report by Agapito Associates, Inc. December 1998 ~Conipletion.Details_.__ ~::_ --. :~_v ~ _ .'~. - z Portland Cement 1385 - 2133 ft (TD) Well Screen 1352 -1362 ft 2 in. PVC Well Cemented from 0 to approximately 1332 ft; bentonite 1332 Casing -1342 ft; sand pack 1342 1362 ft ~Stratigraphic Intejvals and Ma~ceis'=s~'~; ` °^~` '; Uinta Formation .. , .. 1 - Surface 609 ft R-8 Zone 609 - 832 ft A -Groove 832 - 853 ft Mahogany Zone 853 - 1023 ft (Mahogany Marker 886 ft) B -Groove 1023 -1040 ft R-6 Zone 1040 -1232 ft L-5 Zone 1232-1355 ft R-5 Zone 1355 -1675 ft Dissolution Surface 1365 ft • Total Depth (TD) 2133 ft Drilling and Well Completion • Drilled from surface to 154-ft bgs with a 5.125-inch-diameter tri-cone rock bit. Steel, flush-threaded, 4.5-inch outside diameter x 4-inch inside diameter, 0.25-inch wall thickness, core hole surface casing in nominal 20-ft lengths, was run into 154-ft bgs. The top of the casing was approximately 3-ft bgs in the bottom of the drill cellar. The surface casing was permanently cemented in place. A blow-out preventer (BOP) stack was connected to the top of the cemented casing string, and a gas bypass pipe (bluey line) plumbed to the BOP was run downwind and vented approximately 80 ft from the rig. After the casing cement set, the core hole was advanced from 154-ft bgs with 3.75-inch~iameter HX drilling tools to a depth of 1393-ft bgs. At about 1393-ft bgs, a small volume of gas was encountered. The hole was allowed to vent for approximately 30 minutes and drilling resumed at a normal pace. Gas was not encountered in notable quantities during the remainder of the drilling process. The HX coring tools were tripped out of the hole, and the HX drill rods were reset as temporary casing. • . Three-inch-diameter NX drilling tools were used to advance the core hole from 1393-ft bgs to TD at 2133-ft bgs. • Rock core was recovered using a 10-ft-long Christensen double-tube core barrel from 154- to 2133- ft bgs.