基于实验的旋转控制头胶芯密封面寿命优化  

THE LIFE OPTIMIZATION OF THE SEALING SURFACE OF THE ROTATING CONTROL HEAD RUBBER CORE BASED ON THE EXPERIMENT

作　　者：何宇航 侯作富[1] 赵靖影 夏成宇[1] 吴霁薇[1] 黄剑 方永 HE YuHang;HOU ZuoFu;ZHAO JingYing;XIA ChengYu;WU JiWei;HUANG Jian;FANG Yong(School of Mechanical Engineering,Yangtze University,Jingzhou 434023,China;Shale Gas Research Institude of Petro China Soutwest Oil and Gasfield Company,Chengdu 610017,China)

机构地区：[1]长江大学机械工程学院,荆州434023 [2]西南油气田分公司开发事业部,成都610017

出　　处：《机械强度》2020年第5期1198-1206,共9页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51405032);石油天然气装备教育部重点实验室项目(OGE201702-02);长江大学青年人才基金项目(2016cqn29)资助。

摘　　要：欠平衡钻井起下钻过程中,旋转控制头胶芯受到交替循环载荷易发生疲劳失效。首先对旋转控制头的密封原理进行分析,得出了动态密封过程中胶芯的受力情况。然后对胶芯材料进行拉伸试验,确立了变形过程中Yeoh本构模型。再应用Abaqus软件建立了胶芯动态密封有限元模型,进行了起下钻过程中胶芯密封过程的模拟以及影响胶芯密封面疲劳寿命的因素进行了优化分析。对胶芯内径进行了优化,对不同外径钻杆应搭配的胶芯内径尺寸进行优化,得到了常用钻杆最优的钻杆胶芯组合。还对不同井口压力作用下钻杆下放和上提速度进行了优化,井压越大越容易造成胶芯疲劳失效,得出了不同压力条件下钻杆的安全下放和上提速度。最后按照中国标准在中国国家石油工业井控设备质量监督检验中心进行了室内密封试验以及现场应用试验证实了有限元优化的可靠性,对提高胶芯使用寿命和油田作业安全具有重要现实意义。In the process of underbalance drilling,the rubber core of rotating control head is subject to the alternating cycle load,which is prone to fatigue failure.Firstly,the sealing principle of rotating control head is analyzed and the stress of rubber core in dynamic sealing process is obtained.Then,the Yeoh constitutive model in the deformation process was established by the tensile test of the rubber core material.Then ABAQUS software was used to establish the finite element model of the dynamic sealing of the rubber core,and the simulation of the sealing process of the rubber core during the drilling and the optimization analysis of the factors affecting the fatigue life of the sealing surface of the rubber core were carried out.In this paper,the inner diameter of rubber core is optimized,and the inner diameter size of rubber core should be matched with different outer diameter drill pipes is optimized.The paper also optimizes the lowering and lifting speed of drill pipe under different wellhead pressures.The higher the well pressure,the more likely the rubber core fatigue failure will be.The safe lowering and lifting speed of drill pipe under different pressures is obtained.At last,according to the Chinese standard,indoor seal test and field application test were carried out in the well control equipment quality supervision and inspection center of China national petroleum industry to confirm the reliability of finite element optimization,which is of great practical significance to improve the service life of rubber core and oilfield operation safety.

关 键 词：欠平衡钻井 旋转防喷器 有限元仿真 实验及现场应用 

分 类 号：TE931[石油与天然气工程—石油机械设备]