[QUOTE=scotty50;38029]The geology shows a high pressure zone blow the resevoir.
The caing was designed to (almost) to handle the production zone. Somebody (help) can calculate what it would take to float a 9 5/8 * 7" string of casing with 16# mud on the outside and a decresing weight on the inside. (while they were displacing).[/QUOTE]
http://www.drillscience.com/bp/Force%20To%20Lift%20Macando%20Casing%20Hanger%20When%20Seated%20and%20Unseated.xlsx
and/or
http://www.drillscience.com/bp/macondo-well-layout-neat.xls
Enable macros to use the sliders on the second. Hope this is what you were looking for.