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History Well 29.4 <br />• ~ Well 29~ History <br />(Includes Uinta, A Groove, and Dissolution Surface only) <br />`.. <br />Location Section 29, T1S, R97W, 6"' PM <br />Coordinates Northing 11020.09, Easting 13125.09 <br />Collar Elevation 6159.44 ft amsl <br />Duration of Drilling July 10, 1999 through July 15, 1999 <br />Total Drilled Depth 1350 ft <br />Summary Report by~ Agapito Associates Inc December 1998 <br />Stra'tigraphia,lntervals and Martcers,=' ~~ < ~m.~ ~ ~ +_ _ ;~~,~~ ~~ { °~m ~.;~ ~ <br />Uinta Surface - 614 ft <br />A -Groove 748 - 772 ft <br />Mahogany Zone 772 - 955 ft <br />B -Groove 955 - 975 ft <br />Dissolution Surface 1334 ft_ _ <br />.. _ - - <br />Drilling and Well Completion ~ . <br /> Drilling began on well 29-4 on July 10, 1999. Drilling to a TD of 1350 ft <br /> was completed by July 15, 1999. Drilling was done using Laye Western <br /> Explorer-Challenger drill rig set up for reverse-circulation drilling. <br /> Well 29~ was drilled from surface to 80 ft with a 19-inch-diameter tri-cone <br /> rock bit. <br /> A 14-inch-outside diameter (OD) surface conductor casing was run to 80 ft <br />• and cemented in place. The top of the casing was set at ground surface. <br /> After the conductor casing cement hardened, a typical 12.25-inch- <br /> diameter tri-cone long tooth button bit was used to advance the well to a <br /> TD of 1350 ft. <br /> Rock chip samples were separated from drilling fluids in a cyclone <br /> separator and passed over a Shaker table for recovery at 5-ft intervals. <br /> Drilling fluid consisted of clear wa 'r, with a light bentonite and polymer <br /> mud additive. <br /> To prepare the borehole for the first and deepest monitor well installation, <br /> the hole was sealed from 1350 ft (TD) up to 1326 ft with 25 sacks of <br /> bentonite hole plug. The bentonite was place in one vertical lift via a string <br /> of 2.75-inch-OD tremie line composed of nominal 20-ft pipe joints. <br />Dissolution Zone <br /> The Dissolution Zone well (29~D) was completed with a 10-ft fiberglass, <br /> #20 slot screen at 1309 to 1319 ft near the Dissolution Surface (1334 ft). <br /> The silica sand filter pack was placed from 1301 to 1326 ft. <br /> Bentonite hole plug was placed immediately above the sand filter pack at <br /> 1281 to 1301 ft. <br /> The annular interval above the Dissolution Zone well and below the A <br /> Groove installation, from 810 ft to 1281 ft, was sealed with 325 sacks of <br /> Class A Type II cement with ~2% calcium chloride. The cement was <br />. placed via tremie pipe in four separate vertical lifts. <br />