低渗透变形介质砂岩油藏水平井产能研究

The Study on the Horizontal Well Deliverability in Low Permeability Deformed Medium Sandstone Reservoir

基于椭圆流模型获得了考虑启动压力梯度和介质变形条件下的水平井产能方程,并对水平井产能进行了参数敏感性分析。介质变形系数、启动压力梯度以及生产压差等因素对水平井产能有重大影响。实例计算结果表明:介质变形系数或启动压力梯度越大,水平井产能越低;由于介质变形效应的存在,随着生产压差的增加,水平井产能不再直线上升而呈现非线性变化,介质变形系数越大,非线性变化越强。

On the base of elliptic flow model, horizontal well deliverability equation was derived with taking the threshold pressure gradient and the medium deformation condition into consideration, and the parameter sensitivity of the deliverability equation was analyzed. The media deformation factor, threshold pressure gradient and produ- cing pressure drop have a significant impact on the horizontal well deliverability in low permeability reservoirs. The results show that ： the media deformation factor or the threshold pressure gradient is bigger, the deliverability of hor- izontal well is lower. Due to the effect of the deformed media, with the increase of the producing pressure drop, the deliverability of the horizontal well will no longer straight up but has a nonlinear change. The media deformation factor is greater, the nonlinear variation is stronger.