还有上下文吧？
annular packoff 环形封隔
bottom casing packoff 底部套管封隔器
cable packoff 电缆头密封
packoff adapter 密封接头
packoff bushing 封隔衬套
packoff element 封隔元件
packoff sealing area 封隔密封区
packoff nipple 密封短节
packoff preventers 封隔防护设备
packoff shoe 封隔套管鞋
packoff 密封装置
split packoff 拼合式封隔装置
wireline packoff 电缆操作的封隔器
