The method is presented to determine formation average pressure and boundary pressure with threshold pressure gradient and injection-production ratio.

给出了考虑注采比和启动压力梯度的平均地层压力和边界压力的确定方法。

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The flow parameters such as discharge, free surface profile and boundary pressure distribution are simulated by numerical calculating the boundary integral equations.

通过数值求解边界积分方程组，对流量、水面线和边壁压力等水力参数进行了数值模拟。

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Moving radius and moving boundary pressure are derived based on its star-tup pressure gradient. Productivity of vertical wells is derived on the above three parameters.

基于其启动压力梯度，推导出了宾汉流体的运动半径和运动边界压力求取公式在此基础上推导出了垂直井在稳态状态下的产能预测公式。

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Metropolitan Portland's 1.5 million population is already putting pressure on housing needs within the urban growth boundary, and another 700, 000 people are expected to move to the area during the next 20 years.

CNN: Polluted rivers stain Portland's image