Figure drawn from information in a diagram provided by BP to the Dept of Energy.
http://www.energy.gov/open/documents/3.1_Item_2_Macondo_Well_07_Jun_1900.pdf. There are inconsistencies in the original drawing which should be checked before we consider this figure final. Of the three cement barriers listed in tags overlaid on the original drawing, the bottom one is missing from the drawing, and the top two appear to be placed where there is drill pipe in the well bore.
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