This preview shows page 1. Sign up to view the full content.
Unformatted text preview: psi was applied, which indicated that there may have been a blockage in the float collar; The check valves on the float collar may not have properly sealed as a result of damage to the flapper valve pins, or related components, or may have only partially sealed as a result of debris across the seal areas; Lost circulation material or other debris in the mud system could have led to the need to use increased pressure to convert the float collar. If debris was present, there would be no assurance that conversion could be achieved even with the use of higher pressures; The shoe track cement may have been contaminated by mud in the rat hole swapping out with the cement, due to a density differences between the cement and the mud; and Except for a couple of surges or spikes, the flow rate used by the crew was too low to convert the float collar. The failure of BP’s well site leaders and the Transocean Deepwater Horizon rig crew to recognize the risks associated with these multiple problems that 72 occurred between April 19 and April 20 was a possible contributing cause of the blowout. D.
Flow Path Cause 1....
View Full Document