摘要
油田经过长期注水开发进入高含水阶段,产量下降较快以至停采,对停采的高含水油藏开展剩余油分布规律的再认识可以有效提高老油田采收率。为此开展了平板物理模拟实验,利用含油饱和度场分布对剩余油二次富集机理进行研究;同时结合数值模拟研究,验证了高部位区域剩余油分布规律,并对其主控影响因素进行分析。结果表明,剩余油受到残余阻力压差以及渗吸的作用,二次富集主要分布在注采连线的周边以及渗透率较低的高部位地区。确定了影响剩余油二次聚集的影响因素及技术界限值,即油藏满足停采时间超过36个月,地层倾角大于20°,平面渗透率级差大于2,渗透率大于50×10^(-3)μm^(2)等条件可开展油田高含水停采油藏二次挖潜。
After a long period of water injection and development,the oilfield enters the high water-cut stage,and the production decreases rapidly and even stops.Re-understanding the distribution law of remaining oil in the stopped production reservoirs with the high water-cut can effectively improve the recovery efficiency of old oilfields.For this reason,a plate physical simulation experiment was carried out to study the mechanism of secondary enrichment of residual oil by using the distribution of the oil saturation field.At the same time,combined with a numerical simulation study,the distribution law of remaining oil in the high position area was verified,and the main controlling factors were analyzed.The results show that the residual oil is affected by the residual resistance pressure difference and imbibition,and the secondary enrichment is mainly distributed in the peripheral areas of the injection-production line and the high areas with low permeability.The influencing factors and technical limits affecting the secondary accumulation of remaining oil are determined,i.e.,the secondary exploitation can be carried out in a stopped production reservoir with the high water cut if the reservoir meets the conditions such as the stoppage time exceeds 36 months,the formation dip angle is more than 20°,the plane permeability difference is greater than 2,and the permeability is more than 50×10^(-3)μm^(2).
作者
徐伟
王智林
张建宁
黄耀
XUWei;WANG Zhilin;ZHANG Jianning;HUANG Yao(Exploration and development Research Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China;No.1 oil Plant of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225265,China)
出处
《复杂油气藏》
2024年第1期86-91,共6页
Complex Hydrocarbon Reservoirs
基金
中国石化科技攻关项目“百万吨CO_(2)驱油封存示范应用技术研究”(P22180-2)
中国石化江苏油田科技攻关项目“中高含水油藏CO_(2)驱提高采收率关键技术政策研究”(JS22010)。
关键词
剩余油分布
二次聚集
平板模型
影响因素
residual oil distribution
secondary aggregation
plate model
influencing factor
作者简介
第一作者:徐伟(1995-),硕士,主要从事油藏工程相关研究。E-mail:m15190413669@163.com。
