...欠压值 压井 强行完井 [gap=1695] Carbonate reservoir, Underbalance pressure drilling, Displacement mud loss, Negative pressure value, Well killing, Forced completion ..
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The ball screw can be pre pressed, because the pre pressure can make the axial gap reach negative value, and then get higher rigidity.
滚珠丝杠可以加预压，由于预压力可使轴向间隙达到负值，进而得到较高的刚性。
Furthermore, the effect from the negative pore water pressure on the uplift bearing capacity is investigated in the light of the result of the prototype test, of which the value is determined as well.
同时根据原型试验结果，研究了负孔隙水压力对抗拔承载力的影响，确定了其值的大小。
Recommends the proper value of pressure difference between negative pressure wards and adjacent clean zones.
给出了负压病房和相邻洁净区域压差的推荐值。
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