密闭扩张式封隔器的研制及应用

针对扩张式封隔器在应用中存在压力波动及停注时自动解封,易造成各层之间窜通的问题,研制了K344(1)-112密闭扩张式封隔器。该封隔器在注水压力波动及关井停注时依然保持密封状态,解决了层间窜通问题。设计了2种解封方法:一是反洗井解封法,二是上提管柱解封法,方便实用。注水时封隔件轴向压缩,有效缓解胶筒端部应力集中,提高密封效果,延长封隔器使用寿命。该封隔器在胜利油田的53口分层注水井中进行试验应用,施工成功率100%。封隔器封隔可靠,可防止层间窜通。2种解封方式解封可靠,能满足反洗井和起管柱作业的要求。

The Development and Application of the K344(1)-112 Airtight Expansion Packer

As far as the expansion packer is concerned,there exist pressure fluctuation and automatic unsetting during the injection suspension,which will cause interlayer channeling.Considering this problem,the K344(1)-112 airtight expansion packer was developed.The packer is kept in sealing state in pressure fluctuation of water injection and shut-in injection suspension,so the problem of interlayer channeling has been solved.Two unsetting methods were designed.One method is reverse well flushing unsetting method;the other is string-lift unsetting method.The packer is subject to axial compression in water injection,thus stress concentration on the packer rubber end is effectively relieved and the service life of the packer is lengthened.The packer was applied to 53 separate-layer injection wells in Shengli Oilfield in the experiment with a 100% success rate of operation.The packing of the packer is reliable and interlayer channeling can be prevented.The two unsetting methods are reliable in unsetting and they can satisfy the requirement of backwashing and string tripping.