摘要
由于受沉积环境、成岩作用和构造作用的影响,砂体的几何形态表现出非均质性,影响不同注采方式的水驱开发效果。依据陆相沉积油藏砂体展布特点,得到描述砂体几何形态特征的理想模型,建立定注入端和出口端压力的二维两相渗流数学模型,通过数值方法进行差分离散求解,得出砂体宽部注入单位厚度累产油量高于砂体窄部注入;应用油藏数值模拟方法,研究砂体几何形态对注采井网的水驱开发效果,得出注水井位于砂体展布较宽部位而油井位于较窄部位时,水驱前缘推进速度快,油井见水时间短,含水上升速度快,产水量高,定注采压差条件下注水井周围地层压力偏高,日注入量降低,地层泄油效果差,累积产油量少,水驱开发效果差。
Because of sedimentary environment,diagenesis effect,and tectogenesis effect,the geometric shapes of sandstone show anisotropy,which affect the water flooding efficiency.Firstly,According to distribution characters of sandstone of continental sedimentary reservoir,idealized mode to describe shapes of sandstone can be got.The 2-D and two-phase mathematical mode at certain inlet and outlet pressure is established.By applying discrete and differential numerical method,the cumulative oil production per unit thickness at wider part of the sandstone is higher than that at narrow part.By adopting reservoir numerical simulation method,geometric shapes of sandstone effecting the water flooding development is studied and it is obtained that when injector is deployed in narrow part of sandstone and oil well in wide part,the speed of water flood front is fast,and water breakthrough times is shorten,which led to water cut rises rapidly.Under the fixed bottom hole flowing pressure,formation pressure surrounding injector was a little higher,water injection rate dropped and cumulative oil production decreased,which makes the developed results are poor.
出处
《油气井测试》
2011年第3期4-6,75,共3页
Well Testing
基金
国家科技重大专项大型油气田及煤层气开发项目"复杂油气田地质与提高采收率技术"(2009ZX05009)研究内容
关键词
几何形态
水驱
数值模拟
地层压力
剩余油饱和度
geometry shape,water flooding,numerical simulation,formation pressure,residual oil saturation
作者简介
屈亚光，男，1984年出生，中国石油大学（北京）在读博士研究生，主要从事油气田开发、油藏数值模拟研究。
