气控环形防喷器密封胶芯大变形分析  

Analysis of Large Deformation of Sealing Rubber Core of Air-controlled Annular Blowout Preventer

作　　者：姚尧 毛正义 綦耀光[1] 潘隆 张晧 张健[2] 杨勇[1] YAO Yao;MAO Zhengyi;QI Yaoguang;PAN Long;ZHANG Hao;ZHANG Jian;YANG Yong(College of Mechanical and Electronic Engineering,China University of Petroleum,Qingdao Shandong 266580,China;China United CBM Co.,Ltd.,Beijing 100011,China)

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]中联煤层气有限责任公司,北京100011

出　　处：《润滑与密封》2019年第2期39-44,50,共7页Lubrication Engineering

基　　金：国家科技重大专项(2016ZX05066004-002;2017ZX05042003-001);中央高校基本科研业务费专项资金资助项目(16CX02004A)

摘　　要：针对气控环形防喷器胶芯在密封过程中的大变形以及与油管存在密封压力难以计算的问题,建立胶芯物理模型,结合厚壁筒理论与橡胶本构方程,同时考虑胶芯的材料非线性和几何非线性,探讨防喷器密封过程中胶芯变形与接触压力的变化。根据胶芯变形过程中无变形阶段、自由变形阶段和接触变形阶段的不同受力状况,利用迭代的方法对每个离散微段施加控制压力,得到不同控制压力下胶芯变形量与接触压力,并与仿真结果进行比较。结果表明:在自由变形阶段,随控制压力增加,胶芯变形量逐渐增大且由中间向两侧逐渐减小;在接触变形阶段,胶芯内径保持不变,且与油管间接触压力不断增加。采用胶芯变形理论方法计算的接触压力变化规律与仿真结果基本相同,验证了胶芯变形理论计算方法的正确性。Aimed at the large deformation of air-controlled annular blowout preventer(BOP)rubber core in sealing process,and the difficulty in calculating the sealing pressure with the tubing,the physical model of the rubber core was set up.Combining the thick-walled cylinder theory with rubber constitutive equation,and by considering the material nonlinearity and geometric nonlinearity of the rubber core at the same time,the rubber core deformation and the contact pressure during the sealing process of the BOP were investigated.According to the different stress conditions during the no-deformation stage,free deformation stage and contact deformation stage of rubber core deformation process,the control pressure to each discrete micro segment was applied by using iterative methods,and the deformation and the contact pressure of the rubber core under different control pressures were obtained.The theoretical analysis results were compared with the simulation results.The results show that,in the stage of free deformation,with the increasing of control pressure,the deformation of the plastic core is gradually increased,and it is gradually decreased from the middle to both sides.In the stage of contact deformation stage,the inner diameter of the rubber core remains unchanged and the contact pressure between the rubber core and the tubing is increased continuously.The change rule of contact pressure calculated by the theory method of rubber core deformation is basically the same as simulation result,which verifies the correctness of the theoretical calculation method of rubber core deformation.

关 键 词：防喷器 胶芯 变形 接触压力 受力分析 

分 类 号：TB42[一般工业技术]