The effects of reservoir fluid property in high and low pressure and the starting pressure gradient on the percolation laws were taken into account in this model.

给出了极限井底流压和产量拐点的求解方法，分析了启动压力梯度、流体性质等因素对低渗透油藏油井产能的影响。

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By comparing, analyzing and classifying for early pressure curve shape property in deep layer and low percolation gas field of Daqing oilfield, producing potential is predicted.

对大庆深层低渗透气井的早期压力曲线形态特征进行对比分析和归类，预测储层产能。

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Its explosion proof property, over speed and over reel control, prevention of high and low hydraulic pressure, and coordination of braking and hoisting are the key and core points for safety design.

液压提升机的防爆、提升过程中的超速、过卷保护、液压系统的高、低压保护及升降与制动工作协同性是其安全性设计的核心与关键。

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With yields that low, property prices will probably be under pressure in coming years, as more and more couples like the Wollacks figure they are better off renting.

FORBES: Let Your Landlord Sweat Instead