长期水驱储层时变规律表征及对开发动态的影响  

Time-Varying Behaviors of Long-Term Waterflooding Reservoirs:Characterization and Implications for Production Performance

作　　者：李伯英 廖新维[1] 高旺来 李仲豪 陈志明 Li Boying;Liao Xinwei;Gao Wanglai;Li Zhonghao;Chen Zhiming(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing);Oil Production Technology Research Institute,PetroChina Dagang Oilfield Company)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京市102249 [2]中国石油大港油田采油工艺研究院

出　　处：《石油机械》2025年第3期77-85,共9页China Petroleum Machinery

基　　金：国家科技重大专项“低渗-致密储层不同提高采收率方法下油藏工程评价”(2017ZX05009004-005);国家自然科学基金项目“超低渗透油藏渗流规律与高效开发的关键科学问题”(52074322,U1762210)。

摘　　要：具有强非均质性及渗流优势通道的长期水驱开发油藏,由于长时间、高强度的水驱冲刷作用,需考虑实际开发过程中存在的储层物性及油水运移特征的时变表征问题。通过长期水驱物理模拟试验明确了不同渗透率级别下渗透率、相渗时变规律,建立了考虑渗透率、残余油饱和度随驱替倍数变化的时变表征模型。通过耦合商业黑油数值模拟器,建立了考虑不同连续时变特征的数值模拟方法。研究结果表明:随驱替倍数增加,相对高渗储层渗透率呈对数增加,相对中渗储层先下降后呈对数增加,相对低渗储层呈对数下降。残余油饱和度均呈对数下降,且初始渗透率越大,下降幅度越大;考虑渗透率时变,井组综合含水体积分数平均提高0.80%,综合换油率平均降低8.04%,采出程度降低1.48%;考虑相渗时变,波及范围内残余油饱和度最高下降至0.1,井组综合含水体积分数平均降低0.71%,综合换油率平均提高7.68%,采出程度提高1.35%。A-25井组考虑综合时变后,A-25井吸水剖面、H-26井含水体积分数拟合精度分别提高了19.39%、8.92%。研究结果对高含水期油藏的优势通道识别治理及剩余油挖潜具有指导意义。For long-term waterflooding reservoirs with strong heterogeneity and dominant flow pathways,which are exposed to long-lasting and high-intensity scouring,it is necessary to consider the time-varying characterization of reservoir physical properties and oil/water migration behaviors in the actual development process.In this paper,the time-varying behaviors of(relative)permeability at different levels were clarified by physical simulation experiments on long-term waterflooding,and a time-varying characterization model considering the variation of permeability and residual oil saturation with displacement multiplier was established.By coupling the time-varying characterization model with the black oil numerical simulator,a numerical simulation method considering different continuous time-varying features was developed.It is found that with the increase of displacement multiplier,the permeability decreases logarithmically in low-permeability reservoirs,decreases and then increases logarithmically in moderatepermeability reservoirs,and decreases logarithmically in low-permeability reservoirs.The residual oil saturation decreases logarithmically in all types of reservoirs,and more greatly when the initial permeability is higher.When the permeability varies with time,the well cluster exhibits the water cut volume fraction increased by 0.80%averagely,the oil draining ratio decreased by 8.04%averagely,and the recovery efficiency decreased by 1.48%.When the relative permeability varies with time,the residual oil saturation drops to 0.1 at most within the sweep range,and the well cluster reveals the water cut volume fraction decreased by 0.71%averagely,the oil draining ratio increased by 7.68%averagely,and the recovery efficiency increased by 1.35%.When the time-varying effect is considered for the A-25 well cluster,the fitting accuracy increases by 19.39%and 8.92%for water injection profile of Well A-25 and water cut of Well H-26,respectively.The research results are of practical and theoretical significance for identifica

关 键 词：长期水驱 物性时变 渗透率 残余油饱和度 换油率 含水体积分数 

分 类 号：TE312[石油与天然气工程—油气田开发工程]