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first stage approximately 1000 gallons of Portland Type 1/II cement was pumped <br />downhole by ECWS and displaced with 350 gallons of water. After tripping out 310 feet <br />of pipe, 1% calcium chloride was added to the mixer and an additional approximately <br />1100 gallons of Portland Type 1/II cement was pumped downhole and displaced by 350 <br />gallons of water. The pipe was then tripped out another 310 feet. At 10:50 hrs, after <br />pulling the pipe up 372 feet, an additional 500 gallons of water was pumped through the <br />2.875 inch tubing downhole to fully displace the cement from the pipe. After waiting for <br />the cement to harden for 5.5 hours, ECWS tripped in and tagged the top of cement at a <br />depth of 1343 feet at 16:30 hrs. At 16:50 hrs WR Aggregates was on site with a second <br />load of 220 sacks of Portland Type UII cement slurry (1.29 lb/sk, 15.0 lb/gal). ECWS <br />pumped approximately 1000 gallons of Portland Type UII cement downhole, displaced <br />by 300 gallons of water. After tripping out 310 feet of pipe, 1% calcium chloride was <br />added to the mixer and 750 gallons of very thick Portland Type UII cement was pumped <br />downhole. The pipe was tripped out 372 feet and water was added to the cement in order <br />to thin it out enough to pump downhole. At 18:00 hrs, an additional 250 gallons of <br />Portland Type 1/II cement with 1% calcium chloride was pumped downhole, displaced by <br />250 gallons of water. The 2.875 inch pipe was tripped out of the hole, and the hole was <br />shut in for the night at this time. A total of 4200 gallons of cement (approximately 440 <br />sacks) were pumped down the hole on September 8, 2010. <br />On September 9, 2010 at 08:05 hrs, ECWS tripped in and tagged the top of cement at a <br />depth of 612 feet. WR Aggregates arrived onsite at 09:30 hrs with a load of 220 sacks of <br />Portland Type 1/II cement slurry (1.29 lb/sk, 15.0 lb/gal). ECWS initially pumped <br />approximately 1000 gallons of Portland Type 1/II cement downhole, displaced by 250 <br />gallons of water. After tripping out 310 feet of pipe and adding I% calcium chloride to <br />the mixer, an additional approximately 1100 gallons of Portland Type UII cement slurry <br />was pumped downhole, displaced by 350 gallons of water. Cement returns to the surface <br />were noted at this time. All tubing was tripped out of the hole by 10:40 hrs on September <br />9, 2010. After the rig moved off location, the cement was seen to have fallen back to <br />approximately 12 feet from the surface. ECWS rigged down and moved off location by <br />12:00 hrs on September 9, 2010. <br />Conclusion <br />The Natural Soda, Inc. horizontal pregnant sodium bicarbonate fluid recovery well IA- <br />5HR was successfully plugged and abandoned on September 9, 2010. A total of 1816 <br />feet of 7.625 inch production casing was recovered from the well. The production casing <br />below the CIBP, approximately 1787 feet was left in the well from a measured depth of <br />1816 to 3603 feet. The 9.625 inch intermediate casing was perforated between the depths <br />of 295-297 feet, 1495-1497 feet, 1530-1532 feet, and 1580-1582 feet prior to plugging in <br />order to ensure a good annular seal between the Perched, A-Groove and B-Groove <br />Aquifers. In addition, the 7.625 inch production casing was perforated prior to plugging <br />between the depths of 1882 and 1885 feet and 1902 to 1905 feet in order to ensure a good <br />annular seal between the production casing and intermediate casing. A total of <br />approximately 682 sacks of Portland Type UII cement with an average of 0.5% calcium <br />chloride additive were pumped downhole to plug the well from a depth of 1912 feet (top <br />Daub & Associates, Inc. Page 5 of 7 Printed: 9/21/2010 <br />IA-5HR Plug and Abandonment Report