The Stability of a Pipe Stand Racked in a Derrick, Part 2—A General Pipe-Stand Model
- Steven J. Sawaryn (BP) | Phillip D. Pattillo (Clover Global Solutions)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- June 2014
- Document Type
- Journal Paper
- 476 - 486
- 2014.Society of Petroleum Engineers
- 1.10 Drilling Equipment
- Guidance , Derrick, Stability, Pipe-stand, Buckling
- 2 in the last 30 days
- 185 since 2007
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This paper builds on the information contained in Part 1 (the body of the paper preceding the appendices) and presents a general pipe-stand model. The model is based on the Fourier-series solution of the energy equation for calculating the deflection and buckling condition of an inclined, nonuniform pipe stand with an arbitrary number of intermediate loads and stick-up above the top racking board. Full details of the derivation and algorithms are included in the paper. This flexible approach is used to examine more-complex, practical situations that include the buckling sensitivity to the position of the upper support and added loads such as tool joints or running tools racked with the stand. Using a Fourier-sine-series solution avoids dealing with the less familiar higher-order functions encountered in Part 1, so the algorithms can be coded with standard spreadsheet functions. This approach also increases the model’s capability and practical worth, providing a tool suitable for field use. The results for loaded, uniform stands compare within 0.01% with the limiting cases represented by the analytical solutions presented in Part 1. Nonuniformity of the stand can add significantly to the number of series terms required. Several practical examples are used to illustrate the model’s application, including the analysis of stand with a heavy intermediate load where buckling occurred. The model successfully distinguishes between the buckled and nonbuckled conditions.
|File Size||1 MB||Number of Pages||11|
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