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= 18.7 ppg
Since the strength is greater than the load, this is a good
casing point. 258 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 129 Determination of Casing Type
Determination must now be made regarding what type of
casing point this is. Since it is deeper than 65oo ft, and into
abnormally high pressures it cannot be s a surface casing
point. So it is either for intermediate casing, or it is a shallow
liner setting depth.
The determination will be made on a subjective evaluation of
the probability of running the casing string, as intermediate
casing, w/o sticking it short of the 14000 foot projected depth.
Referring to Fig.4, it is noted that normal formation pressure
exists to 11,100 feet. The maximum differential pressure to be
consider ed is provided by the mud weight in the hole when
the casing is run to 14000 feet (16.5 ppg), acting against the
normal formation pressure(9.0 ppg) at 11,100 ft.
The actual ΔP is calculated:
ΔP(4329psi)>allowable ΔP(2400 psi), therefore concluded that the 14000
foot casing point is the shallowest liner setting d...
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- Fall '14