新场须家河组气藏气水两相渗流启动压力梯度实验研究

Experimental study of gas/water two-phase flow threshold pressure of Xinchang Xujiahe gas reservoir

运用岩心流动实验装置,测定了新场须家河组气藏不同渗透率岩心在不同含水饱和度下的气水两相渗流最小启动压力梯度,实验结果表明,低渗透砂岩最小启动压力与流量呈幂函数关系,并以此计算出该须二气藏原始含水饱和度下的最小启动压力梯度为0.03279MPa/cm,须四气藏其启动压力梯度值更低,表现出与含水饱和度关系密切,气体渗流表现具有复合型渗流规律。

By using core flow experimental apparatus, the two-phase fluid flow threshold pressure of four samples in Xujiahe gas reservoir has been tested. The laboratory findings indicate that the minimum threshold pressure of tight sandstone and flow rate are of power function. The minimum threshold pressure of second part of Xujiahe reservoir is 0.03279MPa/cm, the threshold pressure in fourth part of Xujiahe reservoir is lower than in second part of Xujiahe reservoir, which demonstrates a close relation with water saturation and mixed seepage regularity.