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Unformatted text preview: string had been set yet) the pore pressure decreased from 14.5 ppg to 12.6 ppg between the sand interval at 17,233 feet measured depth and the M56 target formation at 18,083 feet through 18,206 feet. Because of the decreasing pore pressure at this depth of the well, there was no drilling margin in the open‐hole section of the well, which meant that the mud weight necessary to prevent the formation from flowing at the upper portion of the open hole could result in the formation fracturing in the lower section. 76 BP explained to its partners, MOEX and BP‐HZN‐MBI00304121. BP‐HZN‐MBI00126338. 76 Id. 74
75 34 Anadarko, that it chose to terminate the well at 18,360 feet MD, based on concerns about well integrity and safety related to this loss of drilling margin. 77 By terminating the well where it did, BP set the total depth of the well in a laminated sand‐shale interface. 78 BP internal guidelines for total well depth specify that drilling should not be stopped in a hydrocarbon interval, unless necessary due to operational, pressure and safety issues. 79 Typically, total depth is no...
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