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Unformatted text preview: ced along a horizontal
hole could exist if: F> Fcr*
209 Nomenclature: E= Modulus of Elasticity(psi)
( D − d )( in )
I= Area Moment of Inertia=
W= Weight/Length Tube lbm/in.
Dh − Dp
R= Radial Clearance Pipe To Hole=
Fcr= Critical Buckling Force ( Simusoldal) lbf.
Fcr*= Critical Buckling Force ( Helical) lbf.
4 4 4 )( in ) 210 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 105 Shock Loading
When casing is decelerated and the slips set,
a compressional shock wave is generated
and travels the length of the casing string, if
reflected and returns as a tensile wave to the
slips. This tensile wave experts a force which,
under certain circumstances can be
significant, and which might result in casing
or coupling damage of failure.
211 Rabia provides the equation describing this
force as approximated by:
Where: Fs = Shock Force (lbf)
WN = Nominal Casing Weight/Length (lbm/ft)
V = Average Velocity of Casing (ft/sec)
The peak force is assumed as twice the average force and
the average r...
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This document was uploaded on 03/28/2014.
- Fall '14