Page 127 - Practical Well Planning and Drilling Manual

Section 1 revised 11/00/bc 1/17/01 2:56 PM Page 103

1.4.24
Casing Design [ ]

Table 1-4 Casing Design Criteria—Production Casing continued

Drilling Criteria Production Criteria

4. Axial loads due to buoyant
weight plus test pressure plus
bending stress if deviated.
Safety factor 1.5.

5. Triaxial analysis incorporating
temperature correction for yield
strengths.
Safety factor 1.25.

Buckling If deep string is in vertical hole
and temperature and/or internal
pressure will significantly
increase during production, cal-
s
b
culate revised F and F and take
necessary action to prevent
buckling.
Other If cementing against massive
salts, cement sheath competence
is as important as the casing
strength properties

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