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Further investigation into the mechanisms of asphaltene deposition and permeability impairment in porous media using a modified analytical model

机译：使用改进的解析模型进一步研究沥青质在多孔介质中的沉积和渗透性损害的机理

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摘要

Asphaltene deposition in porous media and subsequent in situ permeability impairment is one of the main issues during oil production which damages the reservoir rock by clogging pore throats and pore bodies as well as by changing wettability of the formation. The major mechanism(s) under which asphaltene particles deposit and impair permeability are still under investigation as an active research topic in the literature. Recently, several dynamic and static asphaltene deposition tests were conducted by Kord et al. in which live oil and core samples from target reservoirs were used. According to the experimental results associated with the coreflood tests, "surface deposition" was found to be the main mechanism of permeability reduction in porous media. In addition, all the experiments confirmed that "pore throat plugging" caused linear reduction of core permeability versus time up until the "pore throat opening" mechanism comes into effect in restoring core permeability and/or flattening out the decline rate associated with permeability versus time due to flow dynamics effects. Using a novel definition of "critical velocity in pore throats", this new mechanism was mathematically modeled. In order for precise demonstration and quantification of the "surface deposition" mechanism, a novel experimental apparatus was designed and constructed by Soulgani et al.to measure mass of deposited asphaltene versus time. The results were used to present a new term describing the "surface deposition" mechanism. A three-phase, four-component black-oil simulator was then developed and coupled with the deposition model including two mechanisms of "surface deposition" and "pore throat opening". Subsequently, the simulator was verified using two sets of experimental results. A very good match between the values predicted by the model and those originated from the experiments were observed.
机译：沥青质在多孔介质中的沉积以及随之而来的原位渗透性损害是采油过程中的主要问题之一，其通过堵塞孔喉和孔体以及改变地层的润湿性来破坏储层岩石。沥青质颗粒沉积和损害渗透性的主要机理仍是文献中活跃的研究课题。最近，Kord等人进行了一些动态和静态沥青质沉积测试。其中使用了来自目标油藏的活油和岩心样本。根据与岩心驱替测试相关的实验结果，发现“表面沉积”是多孔介质中渗透率降低的主要机理。此外，所有实验均证实，“孔喉堵塞”导致岩心渗透率随时间线性下降，直到“孔喉开口”机制在恢复岩心渗透率和/或拉平与渗透率随时间相关的下降速率方面起作用为止由于流动动力学效应。使用“孔喉中的临界速度”的新定义，可以对这一新机制进行数学建模。为了精确地证明和量化“表面沉积”机理，Soulgani等人设计和构造了一种新型的实验装置，以测量沉积沥青质随时间的变化。结果用于表示“表面沉积”机理的新术语。然后开发了一个三相，四组分的黑油模拟器，并与包括“表面沉积”和“孔喉开口”两种机理的沉积模型相结合。随后，使用两组实验结果对模拟器进行了验证。观察到模型预测的值与实验得出的值非常匹配。

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  • 来源
    《Fuel》 |2014年第ptaa期|259-268|共10页
  • 作者

    S. Kord; O. Mohammadzadeh; R. Miri; B.S. Soulgani;

  • 作者单位

    Enhanced Oil Recovery Research Center, School of Chemical and Petroleum Engineering, Shiraz University, Iran;

    DBR Technology Center, Schlumberger, Edmonton, AB, Canada;

    Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway;

    Department of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran;

  • 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

    Asphaltene; Experiment; Coreflood; Deposition; Permeability impairment;

    机译：沥青质实验;Coreflood;沉积渗透性减损;

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