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Unformatted text preview: ctors could have caused the shoe track cement to fail. First, mud in the wellbore could have contaminated the shoe track cement and caused the cement not to set properly. Second, the shoe track cement might have swapped out with the lighter drilling fluid in the rat hole. Third, some of the shoe track cement could have been lost into the formation. Finally, the failure of the shoe track could have resulted from a combination of these factors. This scenario is represented in Figure 8 below. Figure 8 – Flow up the Production Casing Shoe Track The approximately 189 foot bottom section of the casing in the well, called the shoe track, consisted of sections of casing with a reamer‐guide shoe at the bottom and a dual flapper float collar on top. These sections of casing that make up the shoe track are meant to contain the top, or tail cement, which in the Macondo well was unfoamed cement. 66 The shoe track was designed to prevent u‐tubing in two ways: (1) the presence of 189 feet of cement as a barrier and (2) the float collar’s flow dual flapper valves were designed to allow only one‐way...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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