钻压与推靠力对推靠式旋转导向轴承应力变化规律研究  

Investigation of Stress Variation in Push-the-Bit Rotary Steering Bearings UnderWeight on Bit and Push Forces

作　　者：沈彬 杨皓 薛哲婧 李伟[1] 程峰 逯璐 吴杰 SHEN Bin;YANG Hao;XUE Zhejing;LIWei;CHENG Feng;LU Lu;WU Jie(Manufacture Company,China National Logging Corporation,Xi'an,Shaanxi 710077,China;Changqing Branch,China National Logging Corporation,Xi'an,Shaanxi 710201,China)

机构地区：[1]中国石油集团测井有限公司制造公司,陕西西安710077 [2]中国石油集团测井有限公司长庆分公司,陕西西安710201

出　　处：《测井技术》2024年第5期653-660,共8页Well Logging Technology

摘　　要：轴承系统作为推靠式旋转导向的关键零部件,其精确性、可靠性直接影响钻具对井眼轨迹的控制精度和钻井效率。针对由轴承摩擦块脱落而引起的推靠式旋转导向轴承系统失效这一主要问题,基于井下钻具组合的结构特点,考虑导向工具在井筒内的运动约束形式,建立了有限元分析模型并进行了轴承系统力学分析,得到轴承系统各零部件最大等效应力及其出现的位置随钻压与推靠力变化的规律。研究表明:对于径向轴承和止推轴承,最大等效应力出现位置与推靠力加载方向基本重合,对于轴承摩擦副,最大等效应力出现位置由推靠力加载方向与摩擦副间接触面积共同决定;钻压变化对径向公轴承影响要大于径向母轴承,且对止推轴承摩擦副应力改变更为明显;推靠力变化对近钻头端的径向轴承和止推轴承的影响要大于远钻头端,且对径向轴承摩擦副应力改变更为明显;随钻压或推靠力的减小,轴承摩擦副应力分布更均匀。研究结果可为推靠式旋转导向轴承系统的使用、维修和结构优化提供理论支持。As the key component of the push-the-bit rotary steerable system,the accuracy and reliability of the bearing system directly affect the control accuracy and drilling efficiency of the drilling tool on the borehole trajectory.Based on the structural characteristics of the downhole drilling assembly and the motion constraints in the wellbore,the finite element analysis model is established and the bearing system mechanics is analyzed.The maximum equivalent stress of each component of the bearing system and the change rule of its position with the drilling pressure and the thrust force are obtained.The research shows that for the radial bearing and thrust bearing,the maximum equivalent stress position coincides with the loading direction of the thrust force basically.For the bearing friction pair,the maximum equivalent stress position is determined by the loading direction of the thrust force and the contact area between the friction pairs;the change of drilling pressure has more influence on the radial male bearing than on the radial female bearing,and the change of stress on the friction pair of the thrust bearing is more obvious;the change of the thrust force has more influence on the radial bearing and thrust bearing near the bit end than that at the far bit end,and the change of the friction pair stress of the radial bearing is more obvious;with the decrease of drilling pressure or thrust force,the stress distribution of bearing friction pair is more uniform.The research results can provide theoretical support for the maintenance and structure optimization of the push-the-bit rotary steerable system.

关 键 词：推靠式 旋转导向 轴承系统 摩擦副 应力分布 有限元 

分 类 号：P631.84[天文地球—地质矿产勘探]