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Research Papers: Design and Analysis

A New High Collapse OCTG Collapse Strength Model Based on Twin Shear Unified Strength Theory

[+] Author and Article Information
Hua Tong, Daqiang Guo

College of Mechatronic Engineering,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China

Xiaohua Zhu

College of Mechatronic Engineering,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
e-mail: zxhth113@163.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 3, 2015; final manuscript received February 15, 2016; published online April 29, 2016. Assoc. Editor: Albert E. Segall.

J. Pressure Vessel Technol 138(5), 051203 (Apr 29, 2016) (5 pages) Paper No: PVT-15-1084; doi: 10.1115/1.4032987 History: Received May 03, 2015; Revised February 15, 2016

Drilling through and completing wells through deep and acid environment regions are technically challenging and costly. Based on twin shear unified strength theory (TSUST), a new high collapse (HC) oil country tubular goods (OCTG) collapse strength model, involving the manufacturing imperfections and significant anisotropy of the material, was developed in this paper. Comparisons of numerical calculations with full-scale test collapse data show that the new HC OCTG collapse strength model gets higher calculation accuracy for predicating HC OCTG collapse strength than both American Petroleum Institute (API) Bulletin 5C3 and ISO/TR 10400. Thus, the new HC OCTG collapse strength model will provide a more scientific method and exciting possibility for deep and acid environment wells design and construction.

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Figures

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Fig. 1

Mechanical model of thick-walled cylinder subjected to external pressure

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Fig. 4

Ratio of test collapse strength to predicted collapse strength

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Fig. 3

Typical collapsed samples [19]

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Fig. 2

Collapse test setup

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