摘要
采用增维精细积分法对低渗透油藏油、水两相耦合渗流进行了模拟分析。首先,根据有限差分原理建立了以网格节点孔隙流体压力表示的状态方程,然后根据增维精细积分法建立了求解网格节点孔隙流体压力的递推公式以及显式求解饱和度的计算公式。最后,以典型五点面积注水开发为例,分别采用增维精细积分法和常规的IMPES法进行数值模拟,由两种方法所得的计算结果吻合很好。同时,研究了启动压力梯度对含水率和采油量的影响规律。结果表明,启动压力梯度对含水率和采油量的影响显著,启动压力梯度的存在增加了石油开采的难度。
The simulating analysis of two-phase oil-water flows in a low permeability reservoir was carried out by an increment-dimensional precise integration method.First of all,the state equation denoted with the pore fluid pressures at mesh nodes were established based on finite difference principle.Secondly,the recurrence formulae of pore fluid pressures and moisture saturations at mesh nodes were built up according to the increment-dimensional precise integration method.Finally,the simulation of two-phase oil-water coupled flows for a typical five point area water injection as an example was carried out by means of the increment-dimensional precise integration method and IMPES,respectively.Results show that the data required by the increment-dimensional precise integration method are in good accordance with those by IMPES,and the increment-dimensional precise integration method is reliable.At the same time,the effective law of startup pressure gradients on water cut and oil production has been investigated.Results show that the startup pressure gradients have an outstanding effect on water cut and oil production,and the existence of the startup pressure gradients will enhance the difficulty of oil development.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2010年第6期993-997,共5页
Acta Petrolei Sinica
基金
浙江省自然科学基金项目(No.Y1090250)
浙江省科技计划项目(2009C31124)联合资助
关键词
低渗透油藏
启动压力梯度
两相流
增维精细积分法
状态方程
low permeability reservoir
startup pressure gradient
two-phase flow
increment-dimensional precise integration method
state equation
