摘要
传统方式的化学驱项目一般采取“2+3”的协同方式,也就是先通过水驱井网调整一次到位,再实施化学驱,受剩余油认识和预测精度的影响,会出现部分低产低效井,化学驱含水谷底平台期短,提高采收率幅度有限。为此,胜利油田通过基础攻关和探索实践,创新提出了化学驱与动态优化调整加合增效的“3+2”大幅度提高采收率技术,该技术是指在化学驱过程中,充分发挥和利用驱油体系扩大波及体积、提高驱油效率、调整动态非均质性的特点,主动培育、壮大动态剩余油富集区(“油墙”),适时井网调整、重构流场、均衡注采,高效动用、采出“油墙”,最大程度延长化学驱含水谷底平台期,实现三次采油和二次采油(“3+2”)适配优化、大幅度提高采收率的目的。通过大量物理模拟和数值模拟研究,明确了“井网-驱油剂-剩余油”适配优化提高采收率的机理。该技术在胜坨油田二区东三段5砂组进行了应用,通过优化“3+2”井网调整方式、驱油体系和注入参数等,预计区块含水谷底平台期从3 a延长至8 a,最终采收率为60.5%,比原方案采收率再提高7.5百分点。该技术是老油田大幅度提高采收率的关键技术,可以为中外同类型油藏延长化学驱见效高峰期提供指导和借鉴。
Traditional chemical flooding projects typically adopt the“2+3”combination,which involves adjusting the water flood-ing well pattern before implementing chemical flooding.Due to the limitation in understanding and predicting residual oil,this method often leads to some low-yield and inefficient wells,and the low water cut period of chemical flooding is short,resulting in limited improvement in oil recovery.To address this,Shengli Oilfield innovatively proposed the“3+2”technology for signifi-cantly improving oil recovery through fundamental research and exploratory practice.This technique involves using the oil displace-ment system more effectively during chemical flooding to expand the swept volume,increase the displacement efficiency,and ad-just the dynamic heterogeneity.It actively cultivates and enlarges the dynamic remaining oil enrichment area(“oil wall”),adjusts well pattern on time,reconstructs flow fields,balances injection and production,and efficiently produces the“oil wall”.This maxi-mizes the extension of the low water cut period of the chemical flooding,achieving synergistic efficiency in tertiary and secondary oil recovery(“3+2”)and significantly enhancing oil recovery.Through extensive physical and numerical simulation studies,the suitability optimization mechanism of“well pattern-oil displacement agent-remaining oil”to enhance oil recovery was clarified.The technology was applied in Ed35 of District 2 in Shengtuo Oilfield.It is predicted that the low water cut period will extend from three years to eight years,and the final oil recovery will reach 60.5%,which is 7.5 percent higher than the original plan by optimizing the“3+2”well pattern adjustment,oil displacement system,injection parameters,etc.This technology is critical to significantly im-proving oil recovery in mature oilfields and can provide guidance and reference for similar reservoirs in China and abroad to extend the peak oil production rate period during chemical flooding.
作者
杨勇
曹绪龙
张世明
曹小朋
吕琦
元福卿
李绪明
季岩峰
赵方剑
孟薇
YANG Yong;CAO Xulong;ZHANG Shiming;CAO Xiaopeng;LÜQi;YUAN Fuqing;LI Xuming;JI Yanfeng;ZHAO Fangjian;MENG Wei(Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Dongsheng Jinggong Petroleum Development Group Co.,Ltd.,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2024年第1期54-62,共9页
Petroleum Geology and Recovery Efficiency
基金
中国石化科技攻关项目“陆相老油田‘3+2’大幅度提高采收率技术”。
关键词
化学驱
动态优化调整
见效高峰期
加合增效
大幅度提高采收率
chemical flooding
dynamic optimization adjustment
peak oil production rate period
collaborative efficiency en-hancement
significantly enhanced oil recovery
