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Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory

The internal pressure strength of tubing and casing often cannot satisfy the design requirements in high pressure, high temperature and high H(2)S gas wells. Also, the practical safety coefficient of some wells is lower than the design standard according to the current API 5C3 standard, which brings...

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Autores principales: Lin, Yuanhua, Deng, Kuanhai, Sun, Yongxing, Zeng, Dezhi, Liu, Wanying, Kong, Xiangwei, Singh, Ambrish
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4232241/
https://www.ncbi.nlm.nih.gov/pubmed/25397886
http://dx.doi.org/10.1371/journal.pone.0111426
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author Lin, Yuanhua
Deng, Kuanhai
Sun, Yongxing
Zeng, Dezhi
Liu, Wanying
Kong, Xiangwei
Singh, Ambrish
author_facet Lin, Yuanhua
Deng, Kuanhai
Sun, Yongxing
Zeng, Dezhi
Liu, Wanying
Kong, Xiangwei
Singh, Ambrish
author_sort Lin, Yuanhua
collection PubMed
description The internal pressure strength of tubing and casing often cannot satisfy the design requirements in high pressure, high temperature and high H(2)S gas wells. Also, the practical safety coefficient of some wells is lower than the design standard according to the current API 5C3 standard, which brings some perplexity to the design. The ISO 10400: 2007 provides the model which can calculate the burst strength of tubing and casing better than API 5C3 standard, but the calculation accuracy is not desirable because about 50 percent predictive values are remarkably higher than real burst values. So, for the sake of improving strength design of tubing and casing, this paper deduces the plastic limit pressure of tubing and casing under internal pressure by applying the twin shear unified strength theory. According to the research of the influence rule of yield-to-tensile strength ratio and mechanical properties on the burst strength of tubing and casing, the more precise calculation model of tubing-casing's burst strength has been established with material hardening and intermediate principal stress. Numerical and experimental comparisons show that the new burst strength model is much closer to the real burst values than that of other models. The research results provide an important reference to optimize the tubing and casing design of deep and ultra-deep wells.
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spelling pubmed-42322412014-11-26 Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory Lin, Yuanhua Deng, Kuanhai Sun, Yongxing Zeng, Dezhi Liu, Wanying Kong, Xiangwei Singh, Ambrish PLoS One Research Article The internal pressure strength of tubing and casing often cannot satisfy the design requirements in high pressure, high temperature and high H(2)S gas wells. Also, the practical safety coefficient of some wells is lower than the design standard according to the current API 5C3 standard, which brings some perplexity to the design. The ISO 10400: 2007 provides the model which can calculate the burst strength of tubing and casing better than API 5C3 standard, but the calculation accuracy is not desirable because about 50 percent predictive values are remarkably higher than real burst values. So, for the sake of improving strength design of tubing and casing, this paper deduces the plastic limit pressure of tubing and casing under internal pressure by applying the twin shear unified strength theory. According to the research of the influence rule of yield-to-tensile strength ratio and mechanical properties on the burst strength of tubing and casing, the more precise calculation model of tubing-casing's burst strength has been established with material hardening and intermediate principal stress. Numerical and experimental comparisons show that the new burst strength model is much closer to the real burst values than that of other models. The research results provide an important reference to optimize the tubing and casing design of deep and ultra-deep wells. Public Library of Science 2014-11-14 /pmc/articles/PMC4232241/ /pubmed/25397886 http://dx.doi.org/10.1371/journal.pone.0111426 Text en © 2014 Lin et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Lin, Yuanhua
Deng, Kuanhai
Sun, Yongxing
Zeng, Dezhi
Liu, Wanying
Kong, Xiangwei
Singh, Ambrish
Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory
title Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory
title_full Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory
title_fullStr Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory
title_full_unstemmed Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory
title_short Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory
title_sort burst strength of tubing and casing based on twin shear unified strength theory
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4232241/
https://www.ncbi.nlm.nih.gov/pubmed/25397886
http://dx.doi.org/10.1371/journal.pone.0111426
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