储层伤害下的低速非达西斜井产能分析

在考虑启动压力梯度和储层损害因素的基础上，对斜井井眼周围的单相流体在储层的渗流规律分析，通过空间坐标变换，建立了适用于具有供给边界的稳定渗流条件下的斜井产能公式，并以海拉尔盆地某低渗透油田的一口斜井为例，进行了斜井的流入动态和产能分析，为斜井的合理配产提供了科学依据。分析研究认为，当启动压力梯度（小于0.001MPa）、井斜角（小于20oC）较小时，对斜井的流入动态影响较小，当启动压力梯度、井斜角较大时，对斜井的流入动态影响较大；当井斜角较小时，斜井非达西无阻流量变化不大，井斜角大于200时，曲线开始出现明显上翘，并且随着井斜角的增大，斜井的非达西无阻流量急剧增加；随着油层厚度的增大，斜井非达西无阻流量越大，并且斜井非达西无阻流量与地层厚度成线性关系。

Low Velocity Non-darcy Productivity Analysis under Reservoir Damage

Through space coordinate transformation, capacity formula of inclined well was established under a stable flow conditions while considering start-up pressure gradient and reservoir damage and analysing the law of the single-phase fluid flow in reservoir around the inclined wellbore. Take an inclined well in Hailar Basin which is a low-permeability oil fields for example, dynamics and capacity were analysed, which provide a reasonable scientific basis for proration plan. Studies show that when the pressure gradient less than 0.001MPa, and deviation angle less than 20? inclination has little effect on inflow performance while the pressure gradient and deviation angle is larger, impact on the well inflow performance is greater. When the well angle is small, inclined unimpeded flow of non-Darcy has little change with inclination, but if deviation angle greater than 20? the curve began to upward significantly with the increase of inclination. Slope of the sharp increase in non-Darcy flow unimpeded with inclination increases. The thicker of the reservoir, the greater the slope of non-Darcy flow unimpeded,. And there is a linear relationship between non-Darcy open flow capacity of inclined well and formation thickness.