An Experimental and Numerical Approach to the Prediction of Expandability and Collapse Resistance for Solid Expandable Tubulars
- Jun Agata (Nippon Steel & Sumitomo Metal Corporation) | Eiji Tsuru (Nippon Steel & Sumitomo Metal Corporation) | Mitsuru Sawamura (Nippon Steel & Sumitomo Metal Corporation) | Hitoshi Asahi (Nippon Steel & Sumitomo Metal Corporation) | Hidefumi Tsugihara (Nippon Steel & Sumitomo Metal Corporation)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- April 2013
- Document Type
- Journal Paper
- 406 - 415
- 2013. Society of Petroleum Engineers
- 1.14.1 Casing Design, 4.3.4 Scale
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- 250 since 2007
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This paper describes the material and form factors that control pipeexpandability, the influence of axial restraint during expansion on pipeexpandability, and the post-expansion collapse resistance of solid expandabletubulars. Of the various properties required for the pipe used in anexpandable-tubular system, the most important are pipe expandability andcollapse resistance. Therefore, clarification of the factors that control pipeexpandability and development of a reliable technique to predict pipe-collapseresistance should be useful for the design of casings that use expandabletubulars.
These tasks were tackled as follows. First, two types of pipe were evaluatedby use of a pipe expander that is capable of imposing an axial restraint on thepipe. Next, to prepare a design diagram for pipe expandability, a numericalanalysis was carried out by use of the finite-element method (FEM). Inaddition, a full-scale collapse test was carried out to compare the collapseresistance of the two types of pipe. Then, the validity of two techniques forpredicting the collapse resistance of expanded pipe--FEM model and conventionalformula--was determined.
The results of the research revealed the appropriate combination of pipeform and mechanical properties that can prevent pipe from breaking because ofexpansion. In addition, the expandability of the pipe decreases markedly underan axial restraint imposed on the pipe during expansion. In addition, it ispossible to accurately predict the collapse resistance of pipe after expansionby use of an FEM simulation. Furthermore, by modifying the definitions for pipemechanical properties, it was also discovered that the collapse-predictionformula can be used to accurately predict the collapse resistance of pipe afterexpansion.
The study results will deepen the understanding of the expandability andcollapse of expandable tubular pipes and provide basic data for improving thereliability of casing designs that call for expandable tubulars.
|File Size||1 MB||Number of Pages||10|
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