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History Well 21-0DX <br />• <br />r1 <br />LJ <br />~J <br />Well 21a4DX History <br />(Includes Dissolution Surface only) <br />Location Section 21, T1S, R97W, 6ei PM <br />Coordinates 111.3' East and 580.5' North of SW corner of Section 21 <br />Collar Elevation <br />Duration of Drilling <br />Total Drilled Depth <br />Stratigraphic Interv~ <br />Uinta Formation <br />Green River Formation <br />Parachute Creek Member <br />R-8 Zone <br />A -Groove <br />Mahogany Zone <br />B -Groove <br />6283.5 ft amsl <br />February 19, to February 25, 2000 <br />1453 ft <br />ils and Markers - <br />Surface 692 ft <br />692 - 1502 ft <br />692 -1502 ft <br />692 - 861 ft <br />861 - 884 ft <br />884 - 1068 ft <br />1068 - 1092 ft <br />R-6 Zone 1092 - 1290 ft <br />L-5 Zone 1290-1389 ft <br />R-5 Zone 1389 ft <br />Dissolution Surface 1446 ft <br />Total Depth (TD) 1453 ft <br />Drilling and Well Completion <br />Drilling began on well 21-4DX on February 19, 2000. Drilling to a TD of <br />1453 was completed by February 27, 2000. <br />Well 21~DX was drilled from surtace to 40 ft with a 24-inch-diameter tri- <br />cone rock bit. <br />A 16-inch-outside diameter (OD) surface conductor casing was run to 40 ft <br />and cemented in place. The top of the casing was set at ground surface. <br />Drilled a 7 718' hole from 1110 ft to TD of 1453 ft. Run in hole with <br />logg - s. Couldn't get CBL to work, due to all the gas in the well fluid <br />(acoustic signals don't work in a lot of gas). Called Brad Laney (BLM) <br />about the need of a CBL based on the amount of cement used, the top of <br />cement tags each time, and the method of cementing (i.e. tremie line, <br />which has given excellent cement bonds in the past). He gave a variance <br />on not running the CBL. Attached is an actual cement lift schedule. We <br />ended up only running a Gamma Ray log. <br />After the conductor casing cement hardened, a typigl 14.34-inch- <br />diameter tri-cone long tooth button bit was used to advance the well to <br />1110 ft. Installed 1110 ft of 8 5/8' casing and cemented in place via <br />tremie method. <br />Installed 1432' of 2 718" FG casing, with 10' of .020' screen below (1432'- <br />1442'), and 10' blank on bottom (1442'-1452'). Used the tremie line <br />method to install 10/20 sand from 1,453'-1,419', holeplug from 1,419'- <br />1,403'; and Type II cement from 1,403'- surface. <br />During the entire drilling, the well fluid was sampled every 10' for <br />conductivity, pH, temperature, and rate. Offset monitor wells 21-4 and 21- <br />4U were monitored for fluid level changes. Recovery from 21-4DX was <br />adjusted to maintain fluid levels in the mentioned offset wells. <br />