Since the gas bag is added, the pressure increase within the hydraulic chamber is very slight when the string collar passes through the packing element.
由于增加了气囊，管柱接箍通过胶筒时，液压腔内的压力升高很少。
In order to solve the problem concerning the contact-sealing theory for the common packing element, the design theory of "complete anti-extrusion" is put forward.
针对普通胶筒密封遵循接触式密封理论所存在的问题，提出了封隔器胶筒“完全防突”的设计理论。
Packing element shoulder protection and large locking structure improves the properties of the packer.
封隔元件肩部保护结构和定位大锁块的采用，提高了封隔器的密封、坐封和解封性能。
Packing element shoulder protection and large locking structure improves the properties of the packer.
封隔元件肩部保护结构和定位大锁块的采用，提高了封隔器的密封、坐封和解封性能。
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