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首页> 外文学位 >Mechanistic studies for improved understanding of low salinity waterflooding based enhanced oil recovery and potential application to the Alaskan North Slope reservoirs.
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Mechanistic studies for improved understanding of low salinity waterflooding based enhanced oil recovery and potential application to the Alaskan North Slope reservoirs.

机译：为提高对低盐度注水的认识而进行的机理研究，以提高采收率和在阿拉斯加北坡油藏中的潜在应用。

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摘要

Improvement in the recovery of oil by low or reduced salinity water has been reported by many researchers. However, a consistent mechanistic explanation behind low salinity waterflood has not yet emerged. A thorough literature review was conducted that pertains to low salinity water based enhanced oil recovery and preliminary screening criteria were proposed which may help in narrowing down the responsible mechanisms and identifying suitable candidates for low salinity waterflood. Altogether nine different variables, such as clays, oil characteristics, salinity ranges etc. were considered in developing the screening criteria.;With the exception of some tests on standard Berea sandstone cores, all other experimental studies were carried out on representative Alaska North Slope (ANS) reservoir core samples and oil and brine samples. Experimental studies involved a direct visualization of the release of crude oil from the clay surface with low salinity waterflood as observed through a simple substrate type test. Amott type spontaneous displacement tests were performed to quantitatively determine the effect of low salinity water using core materials containing different types of clays. Two sets of low salinity water coreflooding experiments were conducted in the tertiary recovery mode; first using dead oil and the second using recombined oil at pseudo reservoir conditions to examine the potential in improving oil recovery. Oil recoveries were also compared with continuous injection vs slug-wise injection of low salinity water. Finally, surface level investigation was performed using an optical microscope to visually analyze the impact of low salinity water on core samples. All the experiments performed with low salinity water on Alaska North Slope (ANS) reservoir core samples consistently showed anywhere between a 3--30 % increase in oil production with the use of low salinity brine. The literature review identified wettability alteration, cation exchange capacity, clay type and clay content as some of the dominant mechanisms influencing low salinity waterflooding.
机译：许多研究人员已经报道了通过低盐度水或降低盐度水来改善油的采收率。但是，关于低盐度注水背后的一致机理解释尚未出现。进行了有关低盐度水基油采收率提高的文献综述，并提出了初步筛选标准，这可能有助于缩小责任机制并确定低盐度水驱的合适候选对象。在制定筛选标准时，总共考虑了9个不同的变量，例如粘土，石油特性，盐度范围等;;除了在标准Berea砂岩岩心上进行的一些测试之外，所有其他实验研究都是在代表性的阿拉斯加北坡上进行的（ ANS）储层岩心样品以及油和盐水样品。实验研究涉及通过简单的基质类型测试观察到的低盐度注水法从粘土表面释放的原油的直接可视化。使用含有不同类型粘土的岩心材料进行了Amott型自发位移试验，以定量确定低盐度水的影响。在三次采收模式下进行了两组低盐度岩心驱油实验。首先使用死油，其次在伪储层条件下使用混合油来检查提高采油率的潜力。还对低盐度水的连续注入与塞状注入的采油量进行了比较。最后，使用光学显微镜进行表面液位调查，以目视分析低盐度水对岩心样品的影响。在阿拉斯加北坡（ANS）储层岩心样品上用低盐度水进行的所有实验一致表明，使用低盐度盐水可使石油产量增加3--30％。文献综述确定了润湿性改变，阳离子交换能力，粘土类型和粘土含量是影响低盐度注水的一些主要机理。

著录项

  • 作者

    Chavan, Mukul N.;

  • 作者单位

    University of Alaska Fairbanks.;

  • 授予单位 University of Alaska Fairbanks.;
  • 学科 Petroleum engineering.
  • 学位 M.S.
  • 年度 2015
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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