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Cow Camp CCU -023 UB Completion Notes <br />November 6 <br />• Drill 6-1/4" pilot hole to 60'. <br />• Ream 0' -40' to 11 ". <br />• Set 40' of 8 -5/8" OD, .188 wall, steel casing. <br />• Cement down annulus with tremie pipe and 100 gallons (8 sx) of <br />grout. <br />November 7 -10 <br />• Drill ahead from surface casing with 6-1/4" bit. <br />• TD in Wadge underburden zone at 1290' (driller) . <br />• Run logs to TD - 1290.7' (logger). <br />NOTE: Artesian water flow encountered at about 300'. -1 gpm, <br />from sandstones above the Twentymile SS. Flow volume did not increase <br />until drilling through the Wadge overburden sandstones. Flow then <br />came up to -3 gpm. Flow increased again below the Wadge, in a broken <br />zone at 1227' - 1229'. There was no visible increase in flow below that <br />point. Dennis Jones measured the total flow at -9 gpm. <br />Two broken zones were encountered. The first was below the Lennox <br />coal. There, the bit jumped and dropped 3 -4 times. The caliper log <br />shows a small washout. The second zone, below the Wadge stopped the <br />bit rotation, causing the rotary table to torque up the drill string. When <br />the table was disengaged, it spun back 10 -20 times. The driller was able <br />to work cautiously through the zone and then did not have any more <br />problems with it. The caliper log shows substantial size variation <br />through the zone. <br />November 11 <br />• Plan to land screen at TD. Screen the interval 1230' - 1290'. <br />• Make up the screen assembly from three sections of Johnson Muni- <br />Pak well screen (2" 1D x 4" OD, 4-1/2" nominal, 0.025 slots, SS 304), <br />20' each. <br />• Fit with stainless bottom cap (2" NPT threaded) and a 2" NPT to 2- <br />3/8" NUE thread crossover and a stainless steel centralizer set to 6- <br />1/8" at the top of the screen section. <br />• Tally a string of solid steel casing /tubing, variable lengths of 2 -3/8" <br />OD, .190 wall, J -55 4.6 ppf, NUE, 10 Rnd thread, galvanized. <br />• Lower screen into well and land. Lift 2" to tension. Hang string from <br />a surface plate. Landing mark (1230') is 11" high. Attribute to slough <br />knocked into hole during installation and to unburied threads at each <br />connection (tallied threads -off). <br />