自膨胀封隔器密封性能影响因素分析  

Analysis of the Factors Influencing the Sealing Performance of Swellpacker

作　　者：罗伟[1] 付建红[1] 杨兰田 周伟 许超 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]中石化西北油田分公司 [3]中石油长城钻探工程公司

出　　处：《石油机械》2013年第9期72-75,共4页China Petroleum Machinery

基　　金：国家科技重大专项"超深开窗侧钻井钻完井技术配套"(2011ZX05049-002-002)

摘　　要：封隔器胶筒密封性能的研究关键就是胶筒与井壁之间的最大接触压力。以YZF51/2″×203×3000型遇油膨胀封隔器为研究对象,利用有限元软件分析了胶筒橡胶硬度、井壁摩擦因数以及工作压力对胶筒与井壁的接触压力以及胶筒应力的影响。分析结果表明,随着橡胶硬度的增加,胶筒与井壁间最大接触压力增加,密封性能增加;井壁摩擦因数较小时,胶筒与井壁间最大接触压力随着摩擦因数增加显著,但当摩擦因数大于0.15后,其对接触压力影响较小;工作压力应该控制在90 MPa以内,即工作压差在30 MPa以内,封隔器能够实现安全密封。研究结果可指导自膨胀封隔器胶筒的优化设计以及自膨胀封隔器的现场应用。The maximum contact pressure between packer rubber and well wall is the key to research on the sealing performance of downhole packer rubber. The finite element software was used to analyze packer rubber hardness, well wall friction coefficient as well as the effects of working pressure on the contact pressure between the YZF51/2＂X 203×3000 swellpacker and well wall and on rubber stress. The analysis shows that with the increase of rubber hardness, the maximum contact pressure between packer rubber and well wall increases, and the sealing performance increases. When the well wall friction coefficient is relatively small, the maximum contact pressure be- tween packer rubber and well wall increases remarkably with the increase of friction coefficient. However, when the friction coefficient is greater than 0. 15, its effect on contact pressure is relatively small. The working pressure should be controlled within 90 MPa. In other words, the working pressure difference is within 30 MPa. Then, the safe sealing of the packer can be achieved. The research findings can serve as a guide to the optimal design and field application of swellpacker.

关 键 词：自膨胀封隔器 胶筒应力 接触压力 密封性能 有限元分析 

分 类 号：TE935[石油与天然气工程—石油机械设备]