针对注水时间长，层间或层内压差大，常规封隔器可洗井通道自动打开，导致封隔器不密封，上层地层水窜入下层问题，研制了一种大压差可洗井压缩式封隔器。该封隔器增加了洗井承压装置，使洗井时能承受大压差的层间压差，避免由于层间压差波动导致洗井通道开启，导致该封隔器密封失效，提高了封隔器洗井作业的可靠性。现场应用13口井，最大层间压差3．5 MPa，封隔器验封合格率100％，解决了层间压差大，洗井通道自动打开导致封隔器失效的问题。%For longer-time water injection,large pressure difference of layer or between layers,con-ventional packers flushing channel can be opened automatically,causing the packer not sealed, fleeing into the lower upper formation water problems,a newly developed large pressure differ-ence can be washed well packer.The large pressure washable wells compression packer increased pressure flushing device,making wash well to be able to withstand large pressure difference be-tween the layers,to avoid the inter-layer pressure fluctuations cause flushing channel open,cau-sing the packer seal failure,improve packers flushing operation reliability.In Changqing oilfield applications on 13 wells were carried out,the largest inter-layer pressure was 3.5 MPa,packer seal inspection passed rate of 100%,thus to solve the large pressure difference between layers and failure of the packer problem caused by flushing channel automatic open.
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