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Y221封隔器广泛地应用在隔抽管柱上,但常规Y221封隔器坐封后,在压重作用下,封隔器以上的油管、泵筒会在轴向上弯曲变形,加剧管杆偏磨,增加抽油机负荷,针对此现象,研制了一种自锁式Y221封隔器。阐述了该种封隔器的工作原理,并且针对封隔器胶筒的合理压重,对封隔器卡瓦的锚定力进行了校验,对解封负荷进行了计算。此外,还设计了配套的自锁式Y221封隔器的坐封工具,使得卸载压重后,封隔器既不解封,油管挂还能顺利坐入井口,实现管柱的入井回接。由于在封隔器内部增加了自锁机构及双级解封机构,封隔器坐封后,当释放掉压重时,封隔器依然能够保持坐封状态,封隔器上部管柱处于自由状态,从而减少了抽油杆的上下行摩阻及抽油机负荷。但该管柱在自锁方面有其局限性,即虽然可多次坐封,但只能第1次坐封后可以自锁,再次坐封后不能自锁。
Y221 packer is widely used in every pumping column, but the conventional Y221 packer after setting, under the pressure of the packer above the tubing, pump cylinder will be bent in the axial deformation, exacerbating the tube Partial wear, increase the pumping load, in view of this phenomenon, developed a self-locking Y221 packer. The working principle of this kind of packer is expounded, and in view of the reasonable pressure of packer rubber, the anchoring force of packer slips is verified and the unloading pressure is calculated. In addition, a set of self-locking Y221 packer setting tool is also designed so that the packer can be unlocked without unloading and the tubing hook can smoothly enter the wellhead to achieve the connection of the tubing string into the well. Due to the self-locking mechanism and the double-stage unwinding mechanism added inside the packer, the packer can still remain in the setting state when the packer is set and the pressure is released. The packer upper column is free State, thus reducing the sucker and rod friction and pumping load. But the column in the self-locking has its limitations, that is, although the seat can be set more than once, but only the first time after sitting can be self-locking, after sitting again can not be self-locking.