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Alkaline-surfactant-polymer flooding of active oil under reservoir conditions

机译：储层条件下活性油的碱性表面活性剂 - 聚合物泛滥

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摘要

In this study, we conducted an alkaline/surfactant/polymer (ASP) coreflood at real reservoir temperature and pressure using reservoir core plugs and active live oil. The live oil was prepared by dissolving gases (CH4 and CO2) into dead crude with acid number of 1 mg KOH/g oil and their miscibility under reservoir conditions (62 degrees C and 1700 psig) was tested in a sapphire PVT cell. The results verified the oil and gases were able to reach one single phase after contact time close to 9 hours, which meant no phase separation would occur during live oil coreflood as long as pore pressure was maintained above 1700 psig. After the miscibility test, live oil coreflood was carried out in porous media made of a 1-ft long reservoir core stack. This stack was first restored to the natural reduced reservoir environment following a thorough cleaning. Surfactant formulation screened based on phase behavior tests with dead crude showed remarkable aqueous solubility and interfacial tension reduction capability (solubilization ratio around 60 cc/cc). As low as 0.3% surfactant concentration was used in this coreflood. The injection of 0.3 PV ASP and 3.15 PV polymer recovered 44.5% original oil in place over waterflooding, which accounted for over 90% waterflooding residual oil. The analysis indicated ASP slug was injected at overoptimum salinity (live oil supposed to have a decreased optimum salinity compared to dead crude), which partially fitted the concept of negative salinity gradient that played a positive influence on oil displacement.
机译：在这项研究中，我们在真正的储层温度和压力下进行碱/表面活性剂/聚合物（ASP）CoreFlood，使用储层芯塞和活性活油压。通过将气体（CH 4和CO 2）溶解在酸性1mg KOH / G油中，通过将气体（CH 4和CO 2）溶解成酸性，在蓝宝石PVT细胞中测试其在储层条件下的混溶性（62℃和1700psig）。结果验证了油气和气体能够在接近9小时后达到一个单相，这意味着在Live Oil CoreFlood期间没有发生相分离，只要孔隙压力保持在1700psig以上。在混溶性测试之后，在由1英尺长的储库芯堆叠制成的多孔介质中进行活油芯。在彻底清洁后，该堆栈首先恢复到自然减少的储层环境。基于具有死原油的相行为试验筛选的表面活性剂制剂显示出显着的含水溶解度和界面张力降低能力（溶解比约60cc / cc）。在该核心氟化物中使用低至0.3％的表面活性剂浓度。注射0.3pVAsP和3.15光伏聚合物的原始油状物，在水上造成的水上，占水上剩余油的90％以上。分析所示的ASP块被注入过度最低盐度（与死原油相比具有降低的最佳盐度的活油），这部分安装了对油位移产生积极影响的负盐度梯度的概念。

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  • 来源
    《Fuel》 |2020年第15期|116647.1-116647.9|共9页
  • 作者

    Sui Xin; Chen Zhao; Kurnia Ivan; Han Xu; Yu Jianjia; Zhang Guoyin;

  • 作者单位

    Northeast Petr Univ Sch Chem & Chem Engn Daqing Heilongjiang Peoples R China|New Mexico Inst Min & Technol Socorro NM 87801 USA;

    New Mexico Inst Min & Technol Socorro NM 87801 USA|Jiangnan Univ Sch Chem & Mat Engn Wuxi Jiangsu Peoples R China;

    New Mexico Inst Min & Technol Socorro NM 87801 USA;

    New Mexico Inst Min & Technol Socorro NM 87801 USA;

    New Mexico Inst Min & Technol Socorro NM 87801 USA;

    New Mexico Inst Min & Technol Socorro NM 87801 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Alkaline-surfactant-polymer flooding; Live oil; Miscibility; Phase behavior test; Optimum salinity; Negative salinity gradient;

    机译：碱性表面活性剂 - 聚合物洪水;活油;混溶;相行为试验;最佳盐度;负盐度梯度;

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