摘要
受长期注入水的冲刷作用,注水开发油田的储集层物性及渗流特征参数发生较大变化,从而引起岩石相对渗透率变化范围加大,变化后的相对渗透率曲线形态更为复杂。常规数值模拟软件未能考虑储集层物性和相对渗透率参数的变化,导致模拟结果与实际情况不完全符合。通过建立苏北盆地东部低渗透油藏沙20断块的渗流机理模型,评价了长期注水开发过程中油藏典型特征参数的变化规律,实现对储集层物性和相对渗透率参数时变数值模拟方法的表征。结果表明,针对中低渗透油藏,长期注水冲刷作用导致储集层物性变差,平均剩余油饱和度计算值有所增大,尤其是在注水井附近,但考虑时变效应前后剩余油分布模式基本一致。
Due to the influence of long-term scouring of injected-water, the physical properties and characteristic percolation parameters of reservoirs tend to change greatly in water-injection oilfields, which will result in large variations of relative permeability of rocks and morecomplexity of relative permeability curves after the changes. Conventional numerical modeling software never considers the variations ofphysical properties and relative permeabilities of reservoirs, so that the modeling results can＇t match with the actual situation completely.A percolation mechanism model has been established for low-permeability Sha-20 fault block in eastern Subei basin to evaluate the chang-es of typical characteristic reservoir parameters during long-term water injection, by which the characterization of time-dependent numeri-cal simulation method can be realized for physical properties and relative permeability of reservoirs. The result shows that long-term scour-ing of injected water will result in poorer physical properties and enlargement of the calculated average remaining oil saturation regardingmedium and low permeability reservoirs, especially in the surroundings of injectors. But the remaining oil distribution patterns are basicallythe same before and after considering the time-depending effect.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2016年第3期342-345,共4页
Xinjiang Petroleum Geology
关键词
注水开发
储集层
时变效应
数值模拟
剩余油分布
water flooding development
reservoir
time-dependent effect
numerical simulation
remaining oil distribution
