摘要
针对油气两相流动试井的规律无法用解析方法得到准确认识的事实 ,提出用数值解法来求解的思路 .用数值方法对在均质油藏不存在初始饱和度梯度情况下 ,油气两相流压恢试井的一般规律进行了研究 ,分析了初始饱和度分布、油气两相黏度比及相对渗透率关系的影响 ;进而又研究了初始饱和度梯度对试井规律的影响 .研究首次发现 ,由于高压缩性气体参与渗流 ,会使压力导数曲线表现出了类似于单相流双重介质的“凹子”
It is impossible to realize accurately the pressure build up characteristics by analytic method. The authors present the idea of solving the problem by numerical method. Firstly, the universal law of the pressure build up in homogeneous reservoir is studied without considering saturation gradient, and it is found that there is a depression in pressure derivative curve, which is similar to that of single phase in dual porous media. And then the effects of initial oil saturation, the ratio of oil viscosity to gas viscosity and the relative permeability of oil and gas on pressure build up curves (pressure and its derivative) are analyzed. Lastly, the effects of initial oil saturation gradient on them are discussed. It is shown that, however the factors influence the pressure build up curves, the depression of pressure derivative curve always exists. It is held that the depression appears because of the presence of gas phase.
出处
《西安石油学院学报（自然科学版）》
2002年第5期40-43,共4页
Journal of Xi'an Petroleum Institute（Natural Science Edition)
