Contaminationofthefoamedcementintheannulusbythemudbase

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Unformatted text preview: sea movement, and other factors. The rig crew observed that cement displacement occurred at a rate of approximately 4 bpm, and they believed that full returns were achieved while circulating. 139 Dr. John Smith, an expert retained by the Panel, calculated that both the main pit volume record and the calculated cumulative flow‐out versus flow‐in indicated that about 2.3 bbls of mud was lost during the cement job. John Gisclair of Sperry‐Sun performed a post‐job review of the flow‐in and flow‐out data and agreed with Dr. Smith’s report that if the sensors and paddles had been properly calibrated, the accuracy of the flow‐out volumes should have been within 5 to 10 percent of the recorded data. 140 In testimony, however, Gisclair cautioned that “flow‐out is never intended to be an actual measurement of volume. If you want to see the volume, the actual amounts of a gain or a loss, Pit volume refers to the amount of mud in any of the rig’s mud pits at a given time. Transocean...
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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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