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国内外以往研制的套管外封隔器都不具备平衡套管内外静液柱压差的功能 ,无法满足固井清水顶替作业的要求。据此研制了可用清水或任何密度的钻井液进行顶替的PYF— 140型套管外封隔器 ,其关键技术在于施工阀始终处于动态平衡状态 ,具备平衡套管内外静液柱压差的功能 ;锁紧阀采用新型锁紧方式 ,可确保在胶筒或限压阀失效的情况下 ,自动关闭进入胶筒的通道 ,从而确保套管试压合格 ,而刚性辅助密封性能大大加强的密封部件 ,又加强了管外环空封隔的可靠性。 4口复杂疑难井的应用情况表明 ,采用PYF— 140型套管外封隔器 ,可实现固井清水顶替作业 ,坐封成功率、套管柱试压合格率和固井优质率均为 10 0 %。
The outer casing packer developed at home and abroad does not have the function of balancing the differential pressure of the hydrostatic column inside and outside the casing and can not meet the requirements of cementing water replacement operation. According to this, the PYF-140 external casing packer, which can be replaced by clear water or drilling fluid of any density, has been developed. The key technology of the PYF-140 external casing packer is that the construction valve is always in a state of dynamic equilibrium and has the function of balancing the differential pressure of the hydrostatic column inside and outside the casing ; Locking valve with a new locking method to ensure that in the case of plastic or pressure limiting valve fails to automatically close the access to the plastic tube in order to ensure that the casing pressure test qualified and rigid sealing performance greatly enhanced sealing components , But also strengthens the reliability of the outer ring seal. The application of 4 complicated and difficult wells shows that the PYF-140 type casing external packer can realize the cementing water replacement operation, the setting success rate, the casing pressure test pass rate and cementing quality rate are 10 0%.