We have commented frequently about the similarities between the Montara and Macondo blowouts, particularly the root cause casing shoe issues. In this post, Colin Leach draws attention to the float shoe and collar issues that permitted oil and gas to enter both wells. Click here to view the full post.
The Bly report (page 70) noted some significant “inconsistencies” in the operation of the float shoe/float collar (see full post). This is so similar in nature to the “inconsistencies” in the 9 5/8″ cement job on the Montara well to be scary. The bottom line is that both disasters could have been prevented if these “inconsistencies” had been recognized and additional barriers placed above the float collar. In fact even if there are no “inconsistencies”, the placing of an additional barrier or so seems like an exceptionally prudent step, which would not take that much time or effort.
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