expanded packer

• 膨胀式封隔器

expanded packer的用法和样例：

例句

1. The contraction force will be produced in unsetting of hydraulic packer by lifting tubing string because of effect pressure and pumping and so on.
   采用上提管柱解封的液压式封隔器管柱，由于压力效应及泵抽等因素影响，将产生一定的收缩力。