This type of completion suffers the major disadvantage that the sandface is unsupported and may collapse.

这种完井方法的主要缺点在于生产层表面没有被支承并可能坍塌。

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Then a differential model, which discribes the changes of sandface flow rate under pressure drawdown and buildup is derived. The rate model is used to solve the question …

通过非结构网络，把井眼看作一个网格块，推导出了能反映开、关井后地层渗流量变化的用于求解单相流试井问题的差分模型。

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