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Casing strength degradation due to torsion residual stress in casing drilling / Zhao Zengxin in Journal of natural gas science and engineering, Vol. 1 N° 4-5 (Novembre 2009) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 1 N° 4-5 (Novembre 2009) . - pp. 154-157 Titre : Casing strength degradation due to torsion residual stress in casing drilling Type de document : texte imprimé Auteurs : Zhao Zengxin, Auteur ; Gao Deli, Auteur Article en page(s) : pp. 154-157 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Casing  drilling  Torque  Torsion  status  Residual  stress  Collapse  strength Index. décimale : 665.7 Résumé : Casing string is rotated by torque from wellhead during casing drilling. The method to determine casing torsion status under various torques in casing drilling was discussed. There are three different torsion statuses under different torques, including elastic torsion, elastoplastic torsion and plastic torsion. The residual stress distribution was also discussed under different torques. The average residual stress under elastoplastic and plastic torsion status was calculated respectively; The modified casing collapse strength formula was derived considering the effect of residual stress. The analysis of calculation results indicates that the residual stress caused the collapse strength to decrease 0.033% under elastoplastic torsion, and effects of residual stress on casing strength can be neglected when there is no geometry shape changes in the casing. DEWEY : 665.7 ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2356453%2 [...] [article] Casing strength degradation due to torsion residual stress in casing drilling [texte imprimé] / Zhao Zengxin, Auteur ; Gao Deli, Auteur . - pp. 154-157. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 1 N° 4-5 (Novembre 2009) . - pp. 154-157 Mots-clés : Casing  drilling  Torque  Torsion  status  Residual  stress  Collapse  strength Index. décimale : 665.7 Résumé : Casing string is rotated by torque from wellhead during casing drilling. The method to determine casing torsion status under various torques in casing drilling was discussed. There are three different torsion statuses under different torques, including elastic torsion, elastoplastic torsion and plastic torsion. The residual stress distribution was also discussed under different torques. The average residual stress under elastoplastic and plastic torsion status was calculated respectively; The modified casing collapse strength formula was derived considering the effect of residual stress. The analysis of calculation results indicates that the residual stress caused the collapse strength to decrease 0.033% under elastoplastic torsion, and effects of residual stress on casing strength can be neglected when there is no geometry shape changes in the casing. DEWEY : 665.7 ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2356453%2 [...]

Landing string design and strength check in ultra-deepwater condition / Zhang Hui in Journal of natural gas science and engineering, Vol. 2 N° 4 (Septembre 2010) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 2 N° 4 (Septembre 2010) . - pp.178–182 Titre : Landing string design and strength check in ultra-deepwater condition Type de document : texte imprimé Auteurs : Zhang Hui, Auteur ; Gao Deli, Auteur ; Tang Haixiong, Auteur Année de publication : 2012 Article en page(s) : pp.178–182 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Ultra-deepwater  drilling  Landing  string  design  Strength  check  Bending  stress  Dynamic  load Résumé : Landing string used in ultra-deepwater casing running operations sustains complicated loads, including axial load, slip crushing load, bending load and dynamic load. Landing string design methods based on tension load are presented in detail. In these methods, sufficient margin of over pull is taken into account for the extreme axial load during surface casing running operations and environment loads caused by wave, current and vessel offset and heave. Landing string strength check is discussed to evaluate the safety of landing string in harsh environment. According to the analysis, slip crushing capacity is one of the critical limitations for landing string; bending stress caused by currents is great at the top of landing string at the beginning of operations while it will decrease by adjusting the vessel position after setting the casing below mud line. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000375 [article] Landing string design and strength check in ultra-deepwater condition [texte imprimé] / Zhang Hui, Auteur ; Gao Deli, Auteur ; Tang Haixiong, Auteur . - 2012 . - pp.178–182. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 2 N° 4 (Septembre 2010) . - pp.178–182 Mots-clés : Ultra-deepwater  drilling  Landing  string  design  Strength  check  Bending  stress  Dynamic  load Résumé : Landing string used in ultra-deepwater casing running operations sustains complicated loads, including axial load, slip crushing load, bending load and dynamic load. Landing string design methods based on tension load are presented in detail. In these methods, sufficient margin of over pull is taken into account for the extreme axial load during surface casing running operations and environment loads caused by wave, current and vessel offset and heave. Landing string strength check is discussed to evaluate the safety of landing string in harsh environment. According to the analysis, slip crushing capacity is one of the critical limitations for landing string; bending stress caused by currents is great at the top of landing string at the beginning of operations while it will decrease by adjusting the vessel position after setting the casing below mud line. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000375