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Unformatted text preview: ight of the drill pipe and upward forces of the well. Under either scenario, the BSR failed to shear the drill pipe and seal the wellbore because the pipe was placed in compression outside of the cutting surface of the BSR blades. The Panel concluded that failure of the BOP to shear the drill pipe and seal the wellbore was caused by the physical location of the drill pipe near the inside wall of the wellbore, which was outside the BSR cutting surface during activation on April 20 or April 22. B.
BOP Stack Failure Contributing Causes The BSR could not fully close and seal because a portion of the drill pipe became trapped between the BSR block faces. The elastic buckling of the drill pipe forced the drill pipe to the side of the wellbore and outside of the BSR cutting surface, and was a contributing cause of the BOP failure. C.
BOP Stack Failure Possible Contributing Causes Approximately 28 feet of drill pipe between the upper annular and the upper variable bore ram elastically buckled within the wellbore, causing that portion of the drill pipe to be off‐center. Either of the following scenarios or s...
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