油套管特殊螺纹球面对锥面密封性能理论分析

doi:10.11885/j.issn.16745086.2014.07.28.01

西南石油大学学报(自然科学版) ›› 2016, Vol. 38 ›› Issue (5): 179-184.DOI: 10.11885/j.issn.16745086.2014.07.28.01

• 石油机械工程 • 上一篇

油套管特殊螺纹球面对锥面密封性能理论分析

许红林¹, 李天雷^3,4, 杨斌¹, 施太和², 张智²

1. 重庆科技学院石油与天然气工程学院, 重庆沙坪坝 401331;
2. "油气藏地质及开发工程"国家重点实验室·西南石油大学, 四川成都 610500;
3. 中国石油工程设计有限责任公司西南分公司, 四川成都 610041;
4. 中国石油集团公司石油管工程重点实验室酸性油气田管材腐蚀与防护研究室, 四川成都 610017

收稿日期:2014-07-28 出版日期:2016-10-01 发布日期:2016-10-01
通讯作者: 许红林,E-mail:xuhlaca1986_jy@163.com
作者简介:许红林,1986年生,男,汉族,四川仪陇人,讲师,博士,主要从事石油工程和海洋油气工程专业方面的教学与研究工作。E-mail:xuhlaca1986_jy@163.com;李天雷,1980年生,男,汉族,河南周口人,工程师,主要从事油气田材料选择与腐蚀控制工程设计和研究工作。E-mail:litianlei_sw@cnpc.com.cn;杨斌,1979年生,男,汉族,河南南阳人,副教授,博士,主要从事油气井管柱力学、钻井新技术及油气井工程数值仿真等方面的研究工作。E-mail:xjyangbin1998@163.com;施太和,1938年生,男,汉族,贵州安顺人,教授,博士生导师,主要从事油气井工程方向应用基础和工程技术研究工作。E-mail:taiheshi@126.com;张智,1976年生,男,汉族,四川南充人,教授,博士生导师,主要从事油气井建井工程与安全方面的应用基础和工程技术研究工作。E-mail:wisezh@126.com
基金资助:
国家自然科学基金（51404048，51244007）；重庆市科委基础与前沿研究计划项目（CSTC2014JCYJA90007）；重庆科技学院校内科研基金项目（CK2016B16）。

Theoretical Analysis of Sphere to Cone Sealing Performance for Tubing and Casing Premium Connection

XU Honglin¹, LI Tianlei^3,4, YANG Bin¹, SHI Taihe², ZHANG Zhi²

1. School of Petroleum and Natural Gas Engineering, Chongqing University of Science & Technology, Shapingba, Chongqing 401331, China;
2. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. China Petroleum Engineering Co. Ltd., Southwest Company, Chengdu, Sichuan 610041, China;
4. Sichuan Research Division of the CNPC Key Laboratory for Mechanical and Environmental Behavior of Tubular Goods, Chengdu, Sichuan 610017, China

Received:2014-07-28 Online:2016-10-01 Published:2016-10-01

摘要/Abstract

摘要： 针对油套管特殊螺纹球面对锥面密封结构，基于Hertz接触理论建立了考虑密封面作用扭矩的球面密封接触应力理论模型，研究了球面半径、管体球面弹性模量和密封面作用扭矩对密封面接触宽度和接触应力的影响规律并提出改善球面密封性能的措施，结果表明：随球面半径增加，密封面接触宽度呈抛物线增大，接触应力呈指数减小，且密封面应力分布趋于均匀；随球面弹性模量降低，密封面接触宽度增大，接触应力减小；随密封面作用扭矩增加，密封面接触宽度和接触应力均呈抛物线增大。为提高球面密封性能，建议适当增大球面半径、对球面熔覆合金以降低其弹性模量，同时合理控制密封面作用扭矩，从而增大密封面接触宽度并适当降低密封面接触应力水平。研究结果对优化密封结构、控制上扣扭矩以及提高螺纹密封完整性具有重要理论指导意义。

关键词: 油套管, 特殊螺纹, 球面密封, 接触宽度, 接触应力, 理论分析

Abstract: To study the sphere to cone surfaces sealing structure in tubing and casing premium connection,on the basis of Hertz contact mechanics and considering the sealing surface makeup torque, the sealing contact stress model has been established in this paper. The effects of the spherical radius, elastic modulus of sphere and the sealing surface makeup torque on the sealing width and stress were analyzed. And the measures for improving the sealing performance of spherical sealing were proposed. The results show that the contact width increases parabolically,contact stress decreases exponentially and the contact stress tends to be distributed evenly with the increase of spherical radius,the contact width increases and the contact stress decreases with the decrease of the elastic modulus of sphere,both of the contact width and stress increase parabolically with the increase of sealing surface makeup torque. To enhance the sealing performance of spherical sealing structure,we suggest the following measures: a proper larger spherical radius, a lower elastic modulus of cladding alloy sphere and a properly controlled sealing surface makeup torque for sealing width increase and a proper lower sealing contact stress. The obtained results can be of theoretical significance for sealing parameters optimization, makeup torque control and connection sealing integrity improvement.

Key words: tubing and casing, premium connection, sphere sealing, contact width, contact stress, theoretical analysis

中图分类号:

TE931

许红林, 李天雷, 杨斌, 施太和, 张智. 油套管特殊螺纹球面对锥面密封性能理论分析[J]. 西南石油大学学报(自然科学版), 2016, 38(5): 179-184.

XU Honglin, LI Tianlei, YANG Bin, SHI Taihe, ZHANG Zhi. Theoretical Analysis of Sphere to Cone Sealing Performance for Tubing and Casing Premium Connection[J]. 西南石油大学学报(自然科学版), 2016, 38(5): 179-184.

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油套管特殊螺纹球面对锥面密封性能理论分析

Theoretical Analysis of Sphere to Cone Sealing Performance for Tubing and Casing Premium Connection

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