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XVII. Summary of Panel Conclusions

A. Well Design and Cementing

The Panel concluded that a combination of contamination, over‐
displacement, and possibly nitrogen breakout of the shoe cement were causes of
the blowout.

The decision to set the production casing in a laminated sand‐shale zone
in the vicinity of a hydrocarbon interval was a contributing cause of the blowout.

With the known losses experienced in the well, BP’s failure to take
additional precautions, such as establishing additional barriers during
cementing, was a contributing cause of the blowout.

BP and Halliburton’s failure to perform the production casing cement job
in accordance with industry‐accepted recommendations as defined in API RP 65
was a contributing cause of the blowout.

BP’s decision to set the float collar across the hydrocarbon‐bearing zones
of interest, instead of at the bottom of the shoe, was a contributing cause of the
blowout.

BP’s failure to inform the parties operating on its behalf of all known risks
associated with Macondo well operations was a contributing cause of the
blowout.

BP’s failure to appropriately analyze and evaluate risks associated with
the Macondo well in connection with its decision‐making during the days
leading up to the blowout was a contributing cause of the blowout.

BP’s failure to place cement on top of the wiper plug was a contributing
cause of the blowout.

BP’s decision to use a float collar that was not sufficiently debris‐tolerant
was a possible contributing cause of the blowout.

BP’s decision to set casing in the production interval with known drilling
margin limits at total depth was a possible contributing cause of the blowout.

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