压力和力气不一样，压力是指单位面积内所承受的力。
Pressure is different from force — pressure takes into account the area over which a force is exerted.
压力就是电单位面积上的力。
当采油树或防喷器组关闭时，施加在井口单位面积上的力称之为为关井压力。
The surface force per unit area exerted at the top of a wellbore when it is closed at either the Christmas tree or the BOP stack.
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