Aplication of micro-leakage mechanism for evaluating the sealing performance of non-API casing connections

doi:10.7623/syxb201405018

ACTA PETROLEI SINICA ›› 2014, Vol. 35 ›› Issue (5): 963-971.DOI: 10.7623/syxb201405018

• Petroleum Engineering • Previous Articles Next Articles

Aplication of micro-leakage mechanism for evaluating the sealing performance of non-API casing connections

Xu Zhiqian^1,3, Yan Xiangzhen^2,3, Yang Xiujuan^2,3, Yin Xiaokang¹, Wang Mingda¹, Zheng Xiaoyun¹

1. College of Mechanical and Electronic Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
2. College of Pipeline and Civil Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
3. Oil and Gas CAE Technology Research Center in China University of Petroleum, Shandong Qingdao 266580, China

Received:2014-03-03 Revised:2014-06-29 Online:2014-09-25 Published:2014-08-05

微观泄漏机理在非API套管接头密封性能评估中的应用

许志倩^1,3, 闫相祯^2,3, 杨秀娟^2,3, 殷晓康¹, 王明达¹, 郑晓云¹

1. 中国石油大学机电工程学院山东青岛 266580;
2. 中国石油大学储运与建筑工程院山东青岛 266580;
3. 中国石油大学油气CAE技术研究中心山东青岛 266580

通讯作者: 许志倩，女，1982年10月生，2005年获中国石油大学（华东）机械设计制造及自动化专业学士学位，2010年获中国石油大学（华东）机械设计及理论专业博士学位，现为中国石油大学（华东）机电工程学院副教授，主要从事石油天然气设备机械设计及理论研究工作。Email：xuzhiqian1013@163.com
作者简介:许志倩，女，1982年10月生，2005年获中国石油大学（华东）机械设计制造及自动化专业学士学位，2010年获中国石油大学（华东）机械设计及理论专业博士学位，现为中国石油大学（华东）机电工程学院副教授，主要从事石油天然气设备机械设计及理论研究工作。Email：xuzhiqian1013@163.com
基金资助:
国家自然科学基金青年科学基金项目（No.51105381，No.51205412，No.51204203）、山东省优秀中青年科学家科研奖励基金项目（BS2012ZZ012）、中国石油天然气集团公司重点实验室基础研究课题（2011A-4208）和中央高校基本科研业务费专项资金项目（l4CX02075A）资助。

Abstract

Abstract:

The micro-leakage mechanism was introduced into an evaluation for sealing performance of non-API casing connections, in order to establish the function mapping relationship of surface roughness, sealing structure processing parameters, and gas leakage rate. Rough surface contour curves with normal distribution and preset surface roughness were simulated using the Monte Carlo normal distribution random sampling formula combined with surface roughness processing parameters of the sealing surface. Micro-geometric common feature of the simulated contour curves were analyzed according to their morphological statistical data including average peak angle, average peak height, and the ratio of peak number to sample size associated with different sample sizes and surface roughness. Second, a simplified leakage model of high-hardness tube cone pressed into low-hardness soft metal coating surface with micro-geometric common feature was built, using a combination of rough surface micro-geometric parameters and the elastic-plastic contact mechanic theory. A calculation formula of gas leakage rate containing micro-geometric common feature parameters (e.g., average peak angle and height) was deduced by assuming gas leakage as an incompressible steady laminar flow. Finally, a quantitative evaluation method for sealing performance of non-API casing connections was obtained by substituting total sealing preloaded pressure (which is relevant to important processing parameters of the sealing structure of casing connections) into the calculation formula of gas leakage rate. The calculation results show that the gas leak rates corresponding to varying surface roughness differ by one order of magnitude. The higher the machining accuracy is, the greater the difference is. Thus, surface roughness of metal machining is an important factor that needs to be considered in the design and performance evaluation for sealing structure of non-API casing connections.

Key words: casing connection, sealing performance, leakage rate, surface roughness, non-API, sealing structure, machining precision

摘要：

将微观泄漏机理引入非API套管接头密封性能研究，旨在建立表面粗糙度和密封结构加工参数与微观气体泄漏率之间的函数映射关系。通过Monte Carlo随机正态分布抽样公式结合密封表面粗糙度加工参数，模拟得到服从正态分布和预设表面粗糙度值的粗糙表面轮廓曲线，依据不同样本容量和表面粗糙度下平均峰角、平均峰高和三角峰数目/样本容量等轮廓曲线形貌特征统计数据，分析得到模拟曲线几何共性特征。结合弹塑性力学接触理论和计算得到的粗糙表面几何形貌参数，建立具有几何共性特征的高硬度管体层锥体压入低硬度软金属镀层平面简化泄漏模型，将气体泄漏看作不可压缩稳定层流，推导出含有密封面微观几何形貌特征（平均峰角和平均峰高）的气泄漏率计算公式。将与套管接头主密封结构重要加工参数相关的总密封预紧压力代入微观气体泄漏率计算公式，得到适用于非API套管接头密封性能定量评估计算方法。泄漏率实例计算结果表明，不同表面粗糙度对应气体泄漏率相差一个数量级，且加工精度等级越高相差越明显。非API套管接头密封设计和性能评估必须考虑金属机加工表面粗糙度。

关键词: 套管接头, 密封性能, 泄漏率, 表面粗糙度, 非API, 密封结构, 加工精度

CLC Number:

TE931.2

Xu Zhiqian, Yan Xiangzhen, Yang Xiujuan, Yin Xiaokang, Wang Mingda, Zheng Xiaoyun. Aplication of micro-leakage mechanism for evaluating the sealing performance of non-API casing connections[J]. ACTA PETROLEI SINICA, 2014, 35(5): 963-971.

许志倩, 闫相祯, 杨秀娟, 殷晓康, 王明达, 郑晓云. 微观泄漏机理在非API套管接头密封性能评估中的应用[J]. 石油学报, 2014, 35(5): 963-971.

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Aplication of micro-leakage mechanism for evaluating the sealing performance of non-API casing connections

微观泄漏机理在非API套管接头密封性能评估中的应用

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