As long as the cemented axial tension load is greater

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Unformatted text preview: axial or triaxial corrections to the burst and collapse strengths. 204 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 102 The stabilizing force can be calculated at the bottom and top of each section of a casing string and graphically displayed with the cemented tension load. As long as the cemented axial tension load is greater than the stabilizing force, no buckling occurs. Fs=PiAi-PeAe (Eq.23) 205 Fig.39 Axial Force And stabilizing Forces After Cementing Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 206 103 Fig.40 Fig.41 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 207 208 104 Buckling in Horizontal Wells The compressive force necessary to buckle casing or tubing in a sinusoldal form in a horizontal well has been investigated by Chen, Lin and Ahentha: Fcr=2(EIW/r)1/2 (Eq.24) The same study shows helical buckling an occur if a compressive force exceeds the critical force in the equation: Fcr*=2.828(EIW/r)1/2 (Eq.25) It was also noted that a lockup condition, where buckled pipe could not be for...
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This document was uploaded on 03/28/2014.

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