2010-08-20_PERMIT FILE - C2009087 (4)

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• Run logs to TD (1195.6' logger) . Review log; no apparent cement damage to overburden zone. Decision made not to ream well out to 7- 7/8 ". October 24 • Plan to land screen at TD. Screen the interval 1160' to 1195'. • Make up the screen assembly from three sections of Johnson Muni - Pak well screen (21D x 4" OD, 4-1/2" nominal, 0.025 slots, SS 304), 1@ 5', 1@10', and 1@20'. • Fit with stainless bottom cap (2" NPT threaded) and a 2" NPT to 2- 3/8" NUE thread crossover and a stainless steel centralizer set to 6" at the top of the screen section. • Tally a string of solid steel casing /tubing, variable lengths of 2 -3/8" OD, .190 wall, J -55 4.6 ppf, NUE, 10 Rnd thread, galvanized. • Lower screen into well and land. Lift 2" to tension. Hang string from a surface plate. Landing mark (1195) is 6" high. Attribute to slough knocked into hole during installation and to unburied threads at each connection (tallied threads -oft). • Run in the hole with a string of I" tremie pipe and tag the top of the screen at 1160'. • Lift tremie 4', hang, and prepare to pour sand pack. • Sand pack plan: From TD to 5' above top of screen (1155'). Calculate 8.7 sacks (50 lbs each, 1012/1020 mix) of Colorado Silica Sand. Poured through the tremie with a water flow. • Pour 9 sks sand, wait 15 min. and tag at 115 1' - Thigh. Uncertain of reason for high tag - water entrained in the sand? • Pull back 5 stands of tremie (210') and pour 1 pail (50 lbs) of Cetco 3/8" coated bentonite tablets. NOTE: water began flowing up and out of tubing, but stopped. October 25 • Water flowing out of tubing, - 1 gpm. About 3 gpm flowing up annulus. • Pour 1 pail bentonite pellets to better seal overburden zone. Wait 30 minutes, pour 1 sack of sand to protect seal. • Trip in hole with tremie and tag top of sand at 1147'. NOTE: Calculations for 2 pails of pellets and 1 sack of sand show a fill length of approximately 9' of 6-1/4" hole. This would put top of sand at 1142' if the high tag on 10/24 was correct. If the original calculations for the sand pack were correct and the top of sand was actually approx. 1155', the top of the sand - bentonite would be 1146', which is more in line with the tag today. Will go with today's tag of 1147'.