packoff shoe 封隔套管鞋
annular packoff 环形封隔
cable packoff 电缆头密封
packoff sub 密封短管
split packoff 拼合式封隔装置
packoff adapter 密封接头
packoff bushing 密封补心
packoff element 封隔元件
wireline packoff 电缆操作的封隔器
packoff preventers 封隔防护设备
The key factors which affect the dynamic packoff of the cable with big diameter are analysed and calculated in theory.
对影响大直径电缆动密封的各种因素进行了分析和理论计算，提出了推广应用此项技术应注意的关键因素。
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