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Unformatted text preview: epth. Intermediate Casing Point Determination
2400 = (MW-9.0)(0.052)(11,100)
MW = (2400+9.0*0.052*11,100)/(0.052*11100)
MW = 13.1 ppg
If the swab consideration is subtracted from this mud weight, the formation
pressure into which intermediated casing can be set w/o exceeding the
2400 psi allowable differential pressure can be determined.
Swab Consideration = 0.3 ppg
Formation Pressure = 12.8 ppg
A formation pressure of 12.8 ppg exists at 12550 ft. See (Fig.5). Therefore
12550 ft is the intermediated casing point. Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 130 Fig.5 261 Drilling Liner Interval
Knowing the depth to which intermediate casing is
to be set, and the formation pressure an fracture
gradient associated with that setting depth allows
determination of the tentative deepest point to
which the liner can be set.
Design fracture gradient = 18.0 ppg
= 0.2 ppg
Minimum fracture gradient = 17.8 ppg
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This document was uploaded on 03/28/2014.
- Fall '14