Mechanical behaviors of short-round thread of the API casing  under combined load of stretching and bending moment

doi:10.7623/syxb201301020

Editorial office of ACTA PETROLEI SINICA ›› 2013, Vol. 34 ›› Issue (1): 157-163.DOI: 10.7623/syxb201301020

• Petroleum Engineering • Previous Articles Next Articles

Mechanical behaviors of short-round thread of the API casing under combined load of stretching and bending moment

ZHU Xiaohua 1　 DONG Liangliang 1 　TONG Hua 1 　GAO Yuan 1 　PANG Ran 2

Received:2012-05-19 Revised:2012-08-14 Online:2013-01-25 Published:2013-04-09

拉弯复合载荷作用下的API短圆套管螺纹力学行为

祝效华 1　董亮亮 1 　童　华 1 　高　原 1 　庞　然 2

1. 西南石油大学机电工程学院四川成都 610500; 2. 中国石油川庆钻探工程有限公司川东钻探公司重庆 400021

通讯作者: 祝效华
作者简介:祝效华，男，1978年7月生，2005年获西南石油大学博士学位，现为西南石油大学教授，主要从事管柱力学与井下工具设计方面的研究与教学工作
基金资助:
国家自然科学基金项目(No.51004082，No.51222406)、四川省杰出青年学术技术带头人项目(2011JQ0020)和四川省高等学校科技创新团队项目“油气井管柱力学与井下工具”(12TD007)资助。

Abstract

Abstract:

While casing goes down into the curved section of a horizontal well, whether casing threads have been yielded has a great influence on following drilling and oil-gas production. However, there have been very few researches on mechanical behaviors of casing threads while casing goes down through the curved portion of a horizontal well, such as connection strength and sealing ability of the casing. Based on the principle of virtual work, nonlinear contact theory and von Mises yield criterion, we established a 3-D calculation model for the API short-round casing thread connection, examined the stress distribution of short-round casing threads under combined load of stretching and bending moment, and figured out that hole curvature (bending moment) would significantly influence the connection strength and sealing ability of casing. In addition, a maximum allowance hanging load for various given hole curvature was worked out through a large number of calculations. Based on synthetic considerations of thread connection performance and sealing ability,we recommended the optimized parameters of the API short-round casing thread criteria, including thread taper, thread pitch, thread length and thread ridge thickness. This research has an important engineering reference value for reducing casing thread failure and selecting the casing thread type for the curved section of a horizontal well.

Key words: casing, round thread, hole curvature, combined load, connection strength, sealing ability

摘要：

套管下入水平井弯曲段时，套管螺纹是否已发生屈服对于随后的钻进和油气井生产有至关重要的影响，而目前国内外对于井眼曲率（弯矩）对套管螺纹连接强度和密封性能影响的研究极少。笔者基于虚功原理、接触非线性理论及vonMises屈服准则，建立了API短圆套管螺纹连接的三维计算模型，研究了拉弯复合载荷下连接螺纹的应力分布规律，指出井眼曲率（弯矩）对套管的连接强度和密封性能影响极大，并通过大量计算绘制了给定井眼曲率时的最大许用套管悬重图，综合考虑连接强度和密封能力推荐了API短圆套管螺纹标准所列锥度、螺距、螺纹长度、牙高参数系列中的最优值。

关键词: 套管, 圆螺纹, 井眼曲率, 复合载荷, 连接强度, 密封能力

ZHU Xiaohua　DONG Liangliang　TONG Hua　GAO Yuan　PANG Ran . Mechanical behaviors of short-round thread of the API casing under combined load of stretching and bending moment[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(1): 157-163.

祝效华　董亮亮　童　华　高　原　庞　然 . 拉弯复合载荷作用下的API短圆套管螺纹力学行为[J]. 石油学报, 2013, 34(1): 157-163.

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Mechanical behaviors of short-round thread of the API casing under combined load of stretching and bending moment

拉弯复合载荷作用下的API短圆套管螺纹力学行为

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