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2. Production Casing and Related Components from above the Top

Wiper Plug at 18,115 Feet

The 9‐7/8 x 7 inch production casing and related components (including
the 9‐7/8 x 7 inch cross‐over sub and centralizer subs) were successfully pressure
tested (250 psi low/2,500 psi high) from above the top wiper plug at 18,115 feet.
On September 10, BP conducted a 30‐minute pressure test of the 9‐7/8 inch
production casing annulus that confirmed the lack of flow from the annulus. On
October 7, 2010, BP perforated the 9‐7/8 inch casing between 9,176 feet and 9,186
feet and determined no u‐tube flow occurred from the casing to annulus. Based
on this evidence, the Panel concluded that the well flow did not occur from
inside the 9‐7/8 x 7 inch production casing or its related components (including
the 9‐7/8 x 7 inch cross‐over sub and centralizer subs) from above the top wiper
plug at 18,115 feet.

3. 9‐7/8 Inch Production Casing Shoe Track

Based on the elimination of the potential flow paths from the previous
scenarios, the examination of the blind shear rams that showed interior erosion,
presumably from the high‐pressure flow of hydrocarbons past the rams in the
period after the well event, and the findings contained in the Keystone
Engineering Report, the Panel concluded that the most likely path of
hydrocarbons during the blowout was through the shoe track. The Panel
concluded that hydrocarbon flow during the blowout occurred through the 9‐
7/8 x 7 inch production casing from the shoe track as a result of float collar and
shoe track failure.

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