波动压力是影响井眼稳定的主要因素。
Surge pressure is a major factor which affects borehole stability.
利用多元参数回归的方法，建立了求解偏心环空波动压力的经验模式。
The experience model of eccentric annular has been established by using multiple regression analy8is.
模拟结果表明，在高于功产生的临界温度梯度时，波动压力振幅被显著放大。
The simulation result shows that the dynamic pressure amplitude was amplified obviously when the temperature gradient was above the critical value.
本文根据波动压力计算方法推导出了最大许用起钻速度和下钻速度的计算公式。
By using the surge pressure calculating method, in this paper the formulas have been derived which are used to calculate the maximum allowable velocity in pulling and running pipe in borehole.
在小井眼中，由于水力学系统各流道组合发生了改变，预测和控制小井眼波动压力就显得尤为重要。
Owing to the fact that various flow path assemblages in hydraulic system have been changed in a slim hole, it is even more important to predict and control the surge pressure in the slim hole.
本文用混合隐式特征线法求解了井内流道中的瞬态波动压力问题，给出了弹性管和可压缩流体在井内各流道组合的压力波波动方程和定解条件。
By using the combined implicit characteristic line method, the calculation of the transient surge pressure in the flow conduit of a drilling well has been resolved in this paper.
液压振动系统的主要特点是在桩机液压系统中的压桩油路产生流体压力变化和波动，从而使沉桩力出现高频的周期变化，产生振动压桩的效果。
The main character of the HVS is that, by means of fluctuating oil pressure, the pile-driving force can be changed in a higher frequency, and therefore better vibrating effect can be gained.
液压振动系统的主要特点是在桩机液压系统中的压桩油路产生流体压力变化和波动，从而使沉桩力出现高频的周期变化，产生振动压桩的效果。
The main character of the HVS is that, by means of fluctuating oil pressure, the pile-driving force can be changed in a higher frequency, and therefore better vibrating effect can be gained.
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