摘要
低渗透油藏普遍存在非达西渗流特征,表现为渗流速度与压力梯度关系曲线不为直线且不过原点,即存在启动压力梯度。为了解决基于达西定律的常规产水规律理论在低渗透油藏中难以适用的问题,在考虑了非达西渗流规律的基础上,结合油水两相流管法理论,推导出适用于低渗透油藏的产水规律计算方法,并通过MATLAB软件编程计算出油藏五点井网下的含水上升变化规律。MATLAB软件的计算结果清楚展示了不同注采压差、注采井距下的产水规律,由此可确定出适合油藏的注采压差、注采井距参数,对实际油藏开发有一定的指导意义。
Non-Darcy percolation characteristics commonly exist in low permeability reservoir, the relation curve of flow velocity and pressure gradient is not a straight line and does not pass through the original point, namely there occurs threshold pressure gra- dient. The conventional water production calculation method based on Darcy＇s law is difficult to apply in low permeability reser- voir, accordingly, in order to resolve this problem, this paper deduces calculation methods of water production rule suited for low permeability reservoir, which are based on non-Darcy percolation rule and combined with oil-water two phase flow tube method. By using MATLAB software program, the water cut rising rule has been received under five spot patterns. The results clearly show the water production law under different injection-production pressure and different injection-production well spacing, therefore, the parameters of injection-production pressure and injection-production well spacing are determined, which can provide guidance for actual reservoir development.
出处
《油气藏评价与开发》
CSCD
2016年第6期21-26,共6页
Petroleum Reservoir Evaluation and Development
关键词
低渗油藏
非达西渗流
流管法
产水规律
五点井网
low permeability reservoir, non-Darcy percolation, flow tube method, water production rule, five spot patterns
