多层合采油藏层间非均质性表征研究  

Study on characterization of interlayer heterogeneity in commingling production reservoirs

作　　者：王祚琛 刘慧卿[1] 孙治国[2] 王月杰 骆晨 潘越 WANG Zuochen;LIU Huiqing;SUN Zhiguo;WANG Yuejie;LUO Chen;PAN Yue(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing City,102249,China;Chunliang Oil Production Plant,Shengli Oilfield Company,SINOPEC,Binzhou City,Shandong Province,256504,China;Pengbo Operating Company,CNOOC(China)Co.,Ltd.,Tianjin City,300459,China)

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,北京102249 [2]中国石化胜利油田分公司纯梁采油厂,山东滨州256504 [3]中海石油(中国)有限公司蓬勃作业公司,天津300459

出　　处：《油气地质与采收率》2024年第3期42-53,共12页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目“难采稠油多元热复合开发机理与关键技术基础研究”(U20B6003);中国石油大学(北京)科研基金项目“泡沫强化咸水层CO_(2)封存机理研究”(2462022BJRC003)。

摘　　要：大井段多层合采开发往往面临严重的层间干扰问题,准确描述层间非均质性是解决层间干扰问题的关键。洛伦兹方法是描述层间非均质性最常用的手段,但其在开发领域适用性尚不明确。针对这一问题,运用数值模拟方法及油藏工程理论开展洛伦兹方法开发适用性研究。研究发现:洛伦兹方法表征非均质性与开发效果相关性不强,仅在局部敏感区间内对开发效果产生剧烈影响;同时,当洛伦兹系数相等时,曲线形状对开发效果也有影响,但传统方法无法有效表征。因此,对洛伦兹方法进行了修正,并对修正方法开展了物理模拟实验及油田数据验证。实验结果表明:修正后大大扩展了洛伦兹系数的敏感区间,使得水驱开发效果与洛伦兹系数之间的相关性显著增强。实例应用表明:修正前后,KL-A区洛伦兹系数与采收率相关系数从0.48增至0.87,KL-B区相关系数从0.74增至0.87,可见层间非均质性与开发指标的相关性显著增强。Accurate characterization of interlayer heterogeneity is the key to solving the problem of severe interlayer disturbances caused by large well sections in commingling production reservoir.The numerical applicability of the Lorenz method in development field is investigated by experiments and reservoir engineering theories because it is the most commonly employed method for describing interlayer heterogeneity,but its applicability remains uncertain.The study reveals that the Lorenz method’s characterization of the heterogeneity has a weak correlation with development effects,exerting significant influence on development effects only within a localized sensitive range.Additionally,curve shape also affects development effects when Lorenz coefficients are equal,but traditional methods are ineffective in capturing this phenomenon.Consequently,a modification to the Lorenz method is introduced,followed by physical simulation experiments and validation with oilfield data.Experimental results demonstrate that the modification significantly broadens the sensitive ranges of Lorenz coefficients,leading to a substantial enhancement in the correlation between waterflooding development effects and Lorenz coefficients.Example applications show that the correlation coefficient between the Lorenz coefficients after the modification and recovery factors increases from 0.48 to 0.87 in the KL-A area and from 0.74 to 0.87 in the KL-B area.This highlights a significant enhancement in the correlation between interlayer heterogeneity and development indicators.

关 键 词：多层合采 层间非均质性 洛伦兹方法 渤海KL油田 开发指标 

分 类 号：TE32[石油与天然气工程—油气田开发工程]