So it is either for intermediate casing or it is a

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Unformatted text preview: 0 = 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: ΔP11,100=(16.5-9.0)(0.052)(11,100)=4329 psi ΔP(4329psi)>allowable ΔP(2400 psi), therefore concluded that the 14000 foot casing point is the shallowest liner setting d...
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