第37卷第3期 2016年6月
文章编号：1001-3873(2016)03-0342-04
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI: 10.7657/XJPG20160319
Vol.37,No.3 Jun.2016
考虑储集层参数时变效应的数值模拟方法与应用
金忠康”，方全堂”，王磊，赵龙”
（1.中国石化江苏油田分公司勘探开发研究院，江苏扬州225009；2.西南石油大学石油与天然气工程学院，成都610500
3.中国石油新疆油田分公司勘探开发研究院，新疆克拉玛依834000）
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，从面引起石相对渗透率变化范图加大，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，长期注水冲剧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市模式基本一致。关键调：注水开发：储集层；时变效应；数值模拟；剩余油分布
中图分类号：TE311
文献标识码：A
Numerical Simulation Method and Its Application when Considering Time-Dependent Effect of
ReservoirParameters
JINZhongkang,FANG Quantang,WANGLei',ZHAOLong
(1.Researeh Institute of Exploration and Development, Jiangsu Oilfield Company, Sinopec,Yangzhou, Zhejiang 225009, China;
2.School of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3.Research Institute of Exploration and Development, Xinjiang Oilfield Company, Petrochina, Karamay, Xinjiang 834000, China) Abstract: 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 more complexity of relative permeability curves after the changes. Conventional numerical modeling software never considers the variations of physical 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 regarding medium and low permeability reservoirs, especially in the surroundings of injectors, But the remaining oil distribution patterns are basically the same before and after considering the time-depending effect.
Keywords: water flooding development; reservoir; time-dependent effect; numerical simulation; remaining oil distribution
经过长期注入水的冲刷作用，高含水期油藏储集层物性会发生变化-,但通常的油藏数值模拟研究是从油藏投人开发开始，储集层物性参数均被视为定值，从而导致模拟结果与实际情形有一定出人。目前，储集层物性参数的时变数值模拟研究主要是通过修改传统黑油模型，编制相应程序，实现物性参数时变模拟7-12,这种方法能够灵活地考虑参数时变效应，但商用化难度大，难以满足现场快速应用的要求。笔者采用相应的数学处理手段，将前人建立的渗透率变化倍数与注水冲刷倍数的关系进行了修改，推导出渗透率变化倍数与网格节点含水饱和度的变化关系，以等效实现注水开发过程中储集层渗透率的时变数值模拟，
收稿日期：2015-12-02
修订日期：201602-25
并将这一成果应用于苏北盆地东部低渗透油藏沙20 断块，分析对比考虑储集层渗透率时变效应前后的井底流压、剩余油分布以及时变效应对储集层的影响，结果表明，这一方法可用于评价长期注水开发过程中
油藏储集层物性及渗流特征参数。相对渗透率时变规律
文献[13]根据大量矿场不同开发阶段的取岩心井物性分析资料与室内水冲刷实验成果，研究油田注水开发过程中渗透率变化规律，得出了胜利油区主力砂岩油藏相关数学关系。
(1)渗透率变化倍数与注水冲刷倍数的关系
作者简介：金忠康（1970-），男，江苏吴江人，高级T.程师，油藏T.程，（Tel)15895708695（E-mail)jinzk.jsyt@sinopec.com 万方数据