特殊非牛顿原油水驱开发渗流规律数值模拟方法  

A Numerical Simutation Method for the Flow Law of Water-drived Non-Newtonian Oil Reservoir

作　　者：杨金辉[1,2,3] 鞠斌山 

机构地区：[1]中国地质大学(北京)能源学院 [2]海相储层演化与油气富集机理教育部重点实验室 [3]国土资源部页岩气资源战略评价重点实验室 [4]非常规天然气能源地质评价与开发工程北京市重点实验室,北京100083

出　　处：《科学技术与工程》2018年第6期99-106,共8页Science Technology and Engineering

基　　金：国家重大科技专项课题(2016ZX05011-002)和中央高校基本科研业务费专项(2652015142)资助

摘　　要：在水驱油过程中非牛顿原油的视黏度受压力梯度影响,不同压力梯度区间内其变化规律不同。为了理清非牛顿型原油黏度变化及其对渗流特征和水驱规律的影响,以胜利油区孤岛油田水驱稠油为例,结合该油田流变性实验数据,针对流动规律不同于幂律流体及宾汉流体的特殊非牛顿原油,建立了三段式原油视黏度数学表征模型。运用非线性渗流理论和计算机计算技术,在考虑其黏度随压力梯度的特殊变化关系的基础上,建立了二维油水两相渗流数学模型,并采用有限差分方法进行了求解,且研制了相应的油藏数值模拟软件。构建并模拟了水驱不同性质原油的算例,对4种类型原油的模拟结果表明:生产1 000 d时,水驱牛顿原油采油井含水率为93.7%,其他3种非牛顿原油油井含水率分别为91.2%、88.1%和89.8%。水驱牛顿和非牛顿型原油的油井含水率、压力、黏度分布和水驱前缘均有明显的差异。本方法为更准确模拟和预测非牛顿型稠油油藏水驱开发提供了手段。In process of oil displacement by water flooding,the apparent viscosity of non-Newtonian oil is influenced by pressure gradient,and the changing laws of viscosity differ in different pressure gradientranges. To figure out the changes in non-Newtonian oil and its influences on the seepage characteristics and water flooding law,a three-step mathematical model of oil viscosity based on the rheological properties experiment of Sheng Li Gudao's water drive heavy oil field is set up. Considering the relationship of oil viscosity changes depending on pressure gradient,a two dimensional two phase percolation mathematical model was built by using Non-linear flow theory.Based on the mathematical model and finite difference method,numerical simulation software,which takes the oil viscosity variation into consideration,is developed. Four cases of different viscosity models are set up and simulated on the simulator,the results indicate that water cut reaches 93. 7% in the case of water-drive Newtonian oil when the production come to the 1 000 d,which is higher than other three non-Newtonian models whose water cut reach 91. 2%,88. 1%,89. 8% respectively. There are obvious different in water cut of production well,pressure and viscosity distributions and displacement front for Newtonian and non-Newtonian oil displaced by water. An effective simulation method was provided to accurately predict the development of non-Newtonian heavy oil by water flooding.

关 键 词：非牛顿流体 非线性渗流 数值模拟 粘度变化 稠油开采 

分 类 号：TE312[石油与天然气工程—油气田开发工程]