带金属护肩封隔器的密封特性研究  

A Study on Sealing Properties of a Packer with Metal Shoulder Pad

作　　者：刘祖林[1] 张向宁[2] 陈波[1] 唐海兵[1] 梁开峰 祝效华[2] 

机构地区：[1]中原油田井下特种作业公司 [2]西南石油大学机电工程学院

出　　处：《石油机械》2015年第5期96-100,共5页China Petroleum Machinery

基　　金：中石化中原油田井下特种作业公司科研项目"139.7mm套管‘滑套-封隔器’多级分段压裂工具研究应用"(2013-01)

摘　　要：针对胶筒肩部突出引起封隔器失效的问题,基于封隔器坐封过程,并考虑高温高压对封隔器密封性能的影响,建立了密封组件非线性接触模型,研究了带金属护肩封隔器的密封特性。研究结果表明,常用封隔器坐封过程中,封隔器胶筒表现出较强的肩部突出特性;胶筒肩部突出随坐封力增大而愈加严重,高温高压加剧肩部突出;阶梯坐封力从初始15 MPa增到38 MPa而最终坐封,随温度上升,左端与中间胶筒的接触压力都随坐封载荷的增大而增加,胶筒的密封性能在井温150℃时达到最优;井下温度30℃时压缩距离最大,随着温度升高,压缩距离逐渐变小但差别较小。For the problem of packer failure as a result of rubber shoulder protrusion, a seal assembly nonlinear contact model is built, and the properties of the seal assembly of packer with metal shoulder pad is studied taking into consideration the impact of high temperature and high pressure on the packer＇s sealing performance. The study result indicates that： when a common packer is being set, the packer rubber exhibits significant shoulder protrusion characteristics ; the protrusion of rubber shoulder becomes more severe as the setting force increases, while high temperature and high pressure can aggravate should protrusion; the stepwise setting force increases with temperature to rise from 15 MPa initially to 38 MPa when setting is ultimately completed. The contact pressure of both left and middle rubber increases as the setting load increases, while the rubber sleeve＇ s sealing performance is op- timal at the well temperature of 150 ℃. The compressing distance reaches its maximum when downhole temperature is 30℃ and gradually decreases as temperature rises, but the difference is small.

关 键 词：金属护肩 封隔器 密封组件 接触压力 压缩距离 

分 类 号：TE931[石油与天然气工程—石油机械设备]