Terrestrial stress is a main control on hydrostatic head of reservoir, and its gradient powers oil, gas and water migration.
地应力是影响储层沉积水水头的主要因素，地应力梯度是油气水运移的主要驱动力。
The water inlet of spiral axle and axle head adopt pig iron cover for wear proofing and long life operation. The lifting equipment has two types, manual control and electric control.
螺旋轴的入水头、轴头、采用生铁套，耐磨耐用，提升装置分电动和手动两种。
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