文章摘要
低渗透油藏CO2混相条件及近混相驱研究
Research of Low Permeability Reservoirs CO2 Miscible Conditions and Near Miscible Flooding
投稿时间:2017-12-01  修订日期:2018-02-01
DOI:
中文关键词: 低渗透油藏  CO2近混相驱  混相压力  岩心驱替实验
英文关键词: Low Permeability Reservoir  Carbon Dioxide Near Miscible Flooding  Miscible Pressure  Core Displacement Experiment
基金项目:十三五国家科技科技重大专项课题,“低渗-致密油藏高效提高采收率技术”,项目编号2017ZX05009-004
作者单位E-mail
赵凤兰 北京市昌平区府学18号中国石油大学(北京) zhfl@cup.edu.cn 
张蒙 北京市昌平区府学18号中国石油大学(北京)提高采收率研究中心 m18811636929@163.com 
侯吉瑞 北京市昌平区府学18号中国石油大学(北京)提高采收率研究中心  
侯利斌 北京市昌平区府学18号中国石油大学(北京)提高采收率研究中心  
郝宏达 北京市昌平区府学18号中国石油大学(北京)提高采收率研究中心  
王鹏 北京市昌平区府学18号中国石油大学(北京)提高采收率研究中心  
鲁国用 北京市昌平区府学18号中国石油大学(北京)提高采收率研究中心  
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中文摘要:
      摘要:CO2驱油过程中能否在油藏条件下与原油达到混相直接影响驱油效果,因此对CO2在低渗透油藏中与原油的混相条件及近混相驱进行了研究。采用室内物理模拟方法,通过均质、非均质长方形岩心实验,在评价影响CO2驱油效果的渗透率、岩心长度、渗透率级差和压力因素的基础上,借助采收率与各影响因素参数指标,分析非混相、近混相和混相不同阶段的曲线特征,建立了近混相驱区域的确定方法;采用该岩心实验方法,在模拟油藏条件下,CO2与原油的最小混相压力为18.5MPa左右,比传统细管实验确定的17.8MPa高出0.7MPa,同时根据驱油曲线特征,划分了CO2非混相、近混相和混相区域,并根据驱油效率确定出近混相驱的压力区域为16.5-18.5MPa。建立的最小混相压力岩心测定方法和近混相驱区域划定的方法,为进一步深化CO2近混相驱油机理的认识及YC油田CO2矿场驱油方案的设计提供了参考。
英文摘要:
      ABSTRACT:Whether in the process of carbon dioxide flooding under the condition of the reservoir and oil miscible directly affect oil displacement effect, for carbon dioxide miscible with crude oil in low permeability reservoirs condition and near miscible flooding system research. The indoor physical simulation method, through the homogeneous and heterogeneous rectangular core experiment, the evaluation of effect of carbon dioxide flooding effect, permeability, the core length, Permeability differential and pressure, on the basis of factors such as using recovery rate and above factors, analysis of immiscible, mixed phase and near miscible curve characteristics of different stages, set up the method for determining near miscible flooding area; By the core experiment method, under the condition of simulating reservoir , carbon dioxide with crude oil, the minimum miscible pressure of 18.5 Mpa is higher than traditional tubule experiment of 17.8 Mpa were 0.7 Mpa, and according to the characters of displacement curve, division of immiscible carbon dioxide, nearly mix and mixed phase area, and according to the oil displacement efficiency determine near miscible flooding stress area is 16.5-18.5 Mpa. To establish the minimum miscible pressure core test methods and near miscible flooding zoning method in order to further deepen understood the mechanism of carbon dioxide miscible flooding near mines and YC carbon dioxide flooding scheme for design reference.
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