There are aspects of pipe behavior and limits that can be confusing and counter intuitive. These include understanding the conditions under which a pipe will "buckle" and when the stresses in the pipe will reach a point where the pipe material "yields". The combination of forces, pressures, torque and bending moments that are being applied to the pipe may make it difficult to understand how the pipe will responding. The objective of this paper is to clarify some of these issues and demonstrate a simplified calculation tool for field engineers to use when critical decisions need to be made quickly.
Number of Pages
Lubinski, A.: "Influence of Neutral Axial Stress on Yield and Collapse of Pipe," Trans., ASME, (May 1975) 97.
Newman, K., "Coiled Tubing Pressure and Tension Limits," SPE paper 23131, Proceedings from Offshore Europe 91, Aberdeen, September 1991
Newman, K.N., "Collapse Pressure of Coiled Tubing," SPE 24988, 1992 European Petroleum Conference, Cannes, France, Nov. 16-18, 1992.
Newman, K., Aasen, Jan, "Catastrophic Buckling of Coiled Tubing in the Injector" SPE 46007, 3rd Annual SPE/ICoTA North American Coiled Tubing Roundtable, April 15-16, 1998
McSpadden, A., Newman, K., "Modified CT Limits Analysis for Practical Well Intervention Design", SPE paper 74828, 2002 SPE/ICoTA Coiled Tubing Roundtable, April 2002
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