摘要
非均质、黏性指进是决定CO_(2)驱开发效果的关键因素,而调整注采方式是控抑气窜、扩大波及的有效手段。目前该方向的研究以数值模拟为主,亟需开展CO_(2)驱不同注采方式的物理模拟研究,以进一步明确CO_(2)驱连续气驱、轮换开采和注采耦合等模式的动用机制、开发特征和油藏适应性。通过CO_(2)驱相似物理模拟实验,对比CO_(2)连续气驱、轮换开采和注采耦合模式的开发特征差异,并分析CO_(2)驱不同注采模式的适用性。实验结果表明:连续气驱模式下不同渗透率区域开发效果差异大,低渗透率区域见气后的增油潜力较低,适合相对均质油藏开发;轮换开采模式通过采油井交替开启,改变注采井间主流线方向,有效改善非均质储层中低渗透率区域的开发效果,适合强非均质油藏或气窜后的开发调整阶段;注采耦合模式利用注采交替引起的压力场交替变化,可以较均衡的提高全区波及范围,提高难动用边角区储量动用率,适合弱非均质油藏或前期开发阶段。
The heterogeneity and viscous fingering are the key factors to determine the development effect of CO_(2) flooding.The adjustment of injection-production modes is an effective means to control gas channeling and expand the swept area.At present,research on the above directions mainly focuses on the numerical simulation.Therefore,it is urgent to carry out physical simulation research on different injection-production modes of CO_(2) flooding,so as to further clarify the production mechanism,development characteristics,and reservoir adaptability of modes of CO_(2) flooding such as continuous gas injection,rotation production,and injection-production coupling.In this paper,the development characteristics of these modes were compared through similar physical simulation experiments of CO_(2) flooding,and the applicability of different injectionproduction modes of CO_(2) flooding was analyzed.The results show that the development effect in areas with different permeability is different under the continuous gas injection,and the potential for enhanced oil recovery after gas breakthrough is very low in low-permeability areas,so CO_(2) continuous gas flooding is suitable for developing relatively homogeneous reservoirs.For the rotation production mode,the directions of the mainstream line between injection-production wells can be changed by opening production wells alternately,so as to effectively improve the development effect of low-permeability areas in heterogeneous reservoirs.Therefore,this mode is suitable for strongly heterogeneous reservoirs or the development adjustment stage after gas channeling.The injection-production coupling mode can expand the swept area of the whole reservoir in a more balanced way by alternating injection-production to cause alternating changes in the pressure field,so as to improve the reserves producing ratio in the corner area of the reservoir.Therefore,it is suitable for weak heterogeneous reservoirs or the initial development stage.
作者
郑文宽
张世明
李宗阳
张东
张传宝
刘国
ZHENG Wenkuan;ZHANG Shiming;LI Zongyang;ZHANG Dong;ZHANG Chuanbao;LIU Guo(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Key Laboratory of Carbon Capture,Utilization and Storage,Dongying City,Shandong Province,257015,China;Dongying Tongbang Petroleum Technology Co.,Ltd.,Dongying City,Shandong Province,257000,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第2期86-93,共8页
Petroleum Geology and Recovery Efficiency
基金
中国石化重点实验室课题“咸水层封存CO_(2)作用机理与运移赋存模式研究”(KL22006)
胜利油田博士后工作站项目“CO_(2)驱相似物理模拟方法研究”(YKB2008)。
关键词
CO_(2)驱
相似物理模拟
非均质性
注采耦合
适用性分析
CO_(2)flooding
similar physical simulation
heterogeneity
injection-production coupling
applicability analysis
