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首页> 外文学位 >Pore-scale Analysis of Residual Oil in Sandstones and its Dependence on Waterflood Salinity, Analysed by Tomography and Microscopy
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Pore-scale Analysis of Residual Oil in Sandstones and its Dependence on Waterflood Salinity, Analysed by Tomography and Microscopy

机译：层析成像和显微技术分析砂岩中残留油的孔隙度分析及其对注水盐度的依赖性

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摘要

Understanding of the pore scale phenomena in porous media is a crucial step towards designing a more efficient enhanced oil recovery techniques in large scale oil reservoirs. Three dimensional (3D) x-ray micro CT imaging and recent advanced in 3D image analysis are primary tools that provide unprecedented level of detailed pore scale information of complex rock structures. Combining this technology with laboratory EOR experiments provides valuable insights into the mechanisms behind the oil recovery process. Low salinity water flooding is a relatively convenient and efficient tertiary recovery method which is applicable to the most of the reservoir types. However, its performance prediction is uncertain because this technique is not fully understood. Fundamental understanding of underlying mechanisms of low salinity water flooding, at the pore-scale, by direct visualization and image analysis is the aim of this thesis. In this thesis a technique to quantify fluids and rocks using series of images is developed and applied to 3D images of mini-plugs that underwent Spontaneous imbibition of high and low salinity brine or flooded by high or low salinity brine. Further, oil/rock and oil//brine interfacial areas, oil/brine interfacial mean curvature and oil saturation configuration in each pore was determined for each mini-plug. The image analysis and data interpretation demonstrate that small incremental oil recovery by low salinity brine corresponded to a slight shift towards water-wet in clay-rich outcrop sandstones. Further, the influence of oil composition in the low salinity brine flooding of reservoir sandstones was investigated. Two crude oil which are mainly distinctive in their total acid number (TAN) were used in spontaneous imbibition experiments. All mini-plugs shows strongly oil wet state after spontaneous imbibition of high and low salinity brine. The low salinity effect was observed in mini plug with high TAN oil while the mini-plugs with low TAN oil exhibited much less tertiary recovery. The analysis of mini-plug with high TAN oil shows that the salinity-induced wettability shift was sufficient to displace oil from locations that were already more water-wet in the state after spontaneous imbibition of high salinity brine, but was insufficient to cause oil movement from more oil-wet locations. Pore scale study of core flooded mini-plug shows that the low salinity brine redistributed oil blobs by displacing them from smaller to the larger pores and disconnecting oil. Microscopy studies of mini-plugs after spontaneous imbibition or core flooding provided further insight to the low salinity oil recovery mechanism at local minerals or wettability of pore walls.
机译：了解多孔介质中的孔垢现象是在大型油藏中设计更有效的强化采油技术的关键步骤。三维（3D）X射线微CT成像技术和3D图像分析技术的最新发展是为复杂岩石结构提供前所未有的详细孔隙尺度信息的主要工具。将该技术与实验室的EOR实验相结合，可提供对石油采收过程背后机制的宝贵见解。低盐度水驱是一种相对方便，有效的三次采油方法，适用于大多数储层类型。但是，由于尚未完全了解该技术，因此其性能预测不确定。通过直接可视化和图像分析，对孔隙度范围内的低盐度水驱的基本机理有了基本认识。在本文中，开发了一种使用一系列图像量化流体和岩石的技术，并将其应用于微型塞的3D图像，这些微型塞自发吸收了高盐度和低盐度盐水或被高盐度或低盐度盐水淹没。此外，对于每个微型塞，确定每个孔中的油/岩石和油//盐水界面面积，油/盐水界面平均曲率和油饱和度构型。图像分析和数据解释表明，通过低盐度盐水进行少量的采油量增加，对应于富含粘土的露头砂岩向水润湿的轻微转变。此外，研究了油组成对储层砂岩低盐度盐水驱的影响。在自吸实验中使用了两种主要具有总酸值（TAN）的原油。自发吸收高盐度和低盐度盐水后，所有微型塞都显示出强烈的油湿状态。在含高TAN油的微型塞中观察到低盐度效应，而含低TAN油的微型塞显示出低得多的三次采收率。高TAN油微型塞的分析表明，盐度引起的润湿性变化足以将油从高盐度盐水自发吸收后已经变水的位置驱替，但不足以引起油运动从更多油湿的地方。岩心驱油微型塞的孔隙度研究表明，低盐度盐水通过将油团从较小的孔隙转移到较大的孔隙并断开油的作用来重新分配油团。自吸或岩心驱替后微型塞的显微镜研究提供了对局部矿物质或孔隙壁润湿性低盐度采油机理的进一步认识。

著录项

  • 作者

    Shabaninejad, Mehdi.;

  • 作者单位

    The Australian National University (Australia).;

  • 授予单位 The Australian National University (Australia).;
  • 学科 Applied mathematics.;Petroleum engineering.;Energy.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生理学;
  • 关键词

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