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Unformatted text preview: Deepwater Horizon crew began work toward conducting the critical negative test to evaluate well integrity. Before starting the test, the crew displaced mud from the wellbore with seawater, which would simulate well conditions after the well had been temporarily abandoned. The first step of the negative test was to displace the riser boost line, the choke line, and the kill line with seawater. 225 These efforts began at approximately 4:00 p.m. on April 20. Over the next 30 minutes, the crew pumped the 454 bbls of spacer (consisting, as discussed above, of mixed lost circulation materials). Around 4:30 p.m., the crew then pumped approximately 352 barrels of seawater into the wellbore, which took approximately 25 minutes. After pumping the spacer and seawater, seawater should have been located down the workstring and in the wellbore from 8,367 feet to 5,117 feet total depth and the spacer should have been located just above the seawater ‐ from 5,117 feet to 3,707 feet. 226 After the displacement, the rig crew should have seen a drill p...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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