Y441B型双向锚定封隔器是一种单卡瓦及锥体锚定式封隔器，它利用液压坐封、提放管柱解封。由于设计有坐封平衡机构，解决了因下接头与和心管分开、受力不平衡而造成在坐封的同时自动解封的问题。此外，设计有承压平衡室，改善了工作时的受力状态；采用单面螺纹步进锁紧机构，提高了封隔器坐封和密封的可靠性。因采用单卡瓦双锥体锚定方式，解决了下锥体用主动机械力脱卡的技术难题。 The Y441B Bidirectional Anchored Packer is a single slip and cone anchored packer that uses a hydraulic setting to lift and release a column. As a result of the design has a balance mechanism, to solve the problem due to the next joint and the heart tube separately, caused by imbalance in force while setting the seal automatically closed. In addition, the pressure balance chamber is designed to improve the stress state during operation. The single-threaded step locking mechanism improves the reliability of the packer setting and sealing. Due to the single-slip double-cone anchoring method, the technical problem of decoupling the lower cone by the active mechanical force is solved.