The Stability of a Pipe Stand Racked in a Derrick, Part 1—Foundation
- Steven J. Sawaryn (BP)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- June 2014
- Document Type
- Journal Paper
- 463 - 475
- 2014.Society of Petroleum Engineers
- 1.10 Drilling Equipment
- Pipe-stand, Buckling, Stability, Derrick
- 0 in the last 30 days
- 220 since 2007
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The paper presents an exact analytical solution using higher-order functions for the deflection and buckling of a simple pipe stand in a derrick, modeled as an inclined slender column, with self-weight and pinned at both ends. The results are consistent with industry practice where an intermediate finger board is used to support 93-ft stands of both 2 3/8- and 2 7/8-in. steel pipe but is not required for 3 1/2-in. pipe. These observations suggest a suitable safety factor for application in other cases. The results are an important limiting case for the general pipe-stand model presented in Part 2. Buckling lengths are presented for a range of pipe sizes and types. Sensitivities, such as the presence of tool joints, differences in material, wear, and the effect of pipe stick-up above the top racking board are also introduced. Although there is good agreement between the theory and operational practice for triples, further investigation is needed for quads. Construction columns are normally designed to support significant loads, and in most cases, self-weight plays only a minor role. This is not the case for a simple pipe stand in a derrick, for which stability is solely dependent on self-weight. More-formal analysis of these conditions is warranted because of the trend of increased mechanization and the need to preserve safety and improve operational efficiency. To the author’s knowledge, there is no existing industry guidance for the flexing and stability of pipe stands in a derrick.
|File Size||920 KB||Number of Pages||13|
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