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油套管特殊螺纹密封面微观泄漏机制研究
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国家自然科学基金项目(51574198);国家教育部博士点基金项目(20135121110005).


Research on MicroLeakage Mechanism of Premium Connection Sealing Surface of Tubing and Casing
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    摘要:

    特殊螺纹金属对金属密封的可靠性不仅与主密封面的结构和油套管材料性能有关,而且与螺纹接头密封面表面粗糙度、泄漏介质特性等因素有关,其密封性能的研究是一项复杂而又难以解决的问题。在微观尺度下,分析特殊螺纹金属对金属气密封泄漏机制,并建立微观尺度下气体通过金属密封间隙泄漏速率的理论模型;在考虑密封表面粗糙度的情况下,建立特殊螺纹气体泄漏率的数学模型。以锥面对锥面密封为例,研究密封表面接触应力、表面粗糙度和密封面接触长度对特殊螺纹气体密封性能的影响。计算结果表明:随密封面接触应力的增大和密封面有效接触长度的增加,气体泄漏率均呈幂率指数规律降低;随密封面粗糙度的增加,气体泄漏率随之增大。

    Abstract:

    The sealability of premium connection is not only related to the sealing structure and materials of connections,but also related to the roughness of sealing surface,and the properties of leakage.The sealing performance analysis of tubing and casing’s premium connections is a complex and difficult problem.The sealing leakage mechanism of premium connections was analyzed on the microscale,and the theoretical model of gasleakage rate through metal seal clearance was established on the microscale.Considering the effect of roughness of the premium connection sealing surface,the mathematical model of gasleakage rate of premium connection was established.The influences of the contact pressure of the sealing surface,the surface roughness and length of the sealing surface on the sealing performance were investigated.The results show that the gas leakage of the premium connection is decreased exponentially with the increase of contact stress and sealing surface length,and increased with the increase of sealing surface roughness.

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张颖,练章华,周谧,林铁军.油套管特殊螺纹密封面微观泄漏机制研究[J].润滑与密封,2019,44(8):93-98.
. Research on MicroLeakage Mechanism of Premium Connection Sealing Surface of Tubing and Casing[J]. Lubrication Engineering,2019,44(8):93-98.

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  • 在线发布日期: 2020-03-12
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