An Analysis of the Collapse Strength of Down-Hole Tubings Loaded by Axial Compressive Forces and Bending Moment

Abstract:

Due to collapses of tubings during well testing and completing in HPHT wells, it is required by Petrochina officially to calculate and analysis the collapse strength of down hole tubings with axial forces and corresponding bending moment being taken into considerations. Based on the 4th strength theorem, formulas were derived and method was present to analyze the collapse strength of down hole tubings loaded by compressive axial forces and bending moment to fulfill the official requirements, which could not be accomplished according to published standards and references. And, influences of axial tensile forces, compressive forces and bending loads on the collapse strengths of down hole tubings were studied. It is found that the collapse strength of down hole tubing loaded by compressive axial force is smaller with compressive axial force and buckling bending moment taking into considerations. The bigger the compressive axial forces, the smaller the collapse strengths.

• Periodical: Applied Mechanics and Materials (Volumes 268-270)
• Pages: 733-736
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.268-270.733
• Online since: December 2012
• Authors: Jiang Wen Xu, Hao Zhang, Yi Hua Dou, Xiao Zeng Wang
• Keywords: Analysis, Collapse Strength, Compressive Axial Force, Down-Hole Tubing

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