I want to suggest to you that the primary purpose of PCCs is actually to perform an anticorrosive function, particularly in relation to MLS systems that are subsurface of the sea – Tom Howe, Counsel for the Inquiry
-Mr. Howe made it clear that these caps are primarily for corrosion prevention, particularly in the case of mud line suspensions such as the Montara wells. Regardless of their pressure containing capabilities, PCCs are difficult to test in situ and must be removed with the BOPE in place to avoid operating without a barrier. Other highlights of the Day 3 testimony:
-Seadrill/Atlas engaged in a bit of damage control after implying yesterday that their OIM had lead responsibility for all operations at the facility. In a response to a question from the Seadrill attorney, Mr. Gouldin (Seadrill) rephrased his position as follows:
In various parts of my evidence yesterday, there were issues that came up about the OIM having full responsibility, but he can only undertake that responsibility if he is given clear and full information and facts from the other parties involved in the operation. He cannot operate in isolation. When I answered that the responsibility is there – yes, the responsibility is there to be transparent to him at all times in order to allow him to fully enact his duties. That’s what I meant in my response.
-In questioning Mr. Gouldin and Mr. Millar (Seadrill/Atlas), Mr. Howe clearly established that there was fluid influx following the cementing of the 9 5/8″ casing and that the response to this influx (injecting cement and fluid volumes greater than the influx) likely exacerbated the problem.
-Mr. Howe presented evidence that the the inhibited sea water that was left in the suspended well may not have been sufficiently weighted to over-balance the formation pressure in the reservoir
-Insufficient cement volumes may have facilitated gas migration during cementing.
-Senior PTTEP personnel were aware that the 13 3/8″ corrosion cap had not been installed. Mr. Howe suggested that the cap may not have been installed because it was in poor condition.
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