1 overburden stress gradientpsift copyrightc 2005 by

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Unformatted text preview: re at 3522ft =14.2 ppg ×0.052 ×3522ft=2601 psi So the effective fracture gradient form the mud flow line at the drill ship deck to the casing seat =(2601psi ×19.23)/(200ft+1000ft+3000ft)=11.9ppg Fig.1 Overburden Stress Gradient(psi/ft) Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 68 Well Planning 137 Section 1 “Maximum Load” Casing Design Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 69 Design procedure The starting point in “ Maximum Load” casing design is an evaluation of maximum loads pertinent to a geographical region or geological section. It would be difficult to list the considerations for all the possible combinations of regions. With that in mind, a general application to the Gulf Coast Area will be used. 139 Surface Casing Design Burst Design The maximum burst load or surface casing is considered the result of a kick in which the lightest possible influx fluid blows out and replaces the drilling fluid within the casing. The blowout is contained and the m...
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