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Modelling of bypassed oil recovery in EOS compositional simulation.

机译：EOS组成模拟中的旁路采油建模。

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摘要

The local equilibrium assumption in the conventional composition simulation allows for no bypassing of oil at the sub-grid scale. Oil bypassing by gas, however, always occurs due to micro and macroscopic heterogeneities, gravity, and front instability.;This research presents an efficient two-step method to model bypassed oil recovery in multiphase compositional flow simulation of gas floods. The oil bypassing is first quantified by use of the dual-porosity flow with three dimensionless groups: the bypassed fraction, throughput ratio, and longitudinal Peclet number. To represent bypassed oil recovery in single-porosity flow, a new flow-based fluid characterization is applied to part of the heavy fractions of the fluid model used. Properties for pseudo components are determined based on the throughput ratio estimated in the dual-porosity flow. Case studies for various reservoir/fluid properties show that single-porosity flow with the new method successfully represents bypassed oil recovery observed in core-flooding experiments and fine-scale heterogeneous simulations.
机译：传统组成模拟中的局部平衡假设不允许子网格规模上的油旁路。然而，由于微观和宏观的非均质性，重力和锋面的不稳定性，总是会发生气体绕过石油的情况。该研究提出了一种有效的两步方法，用于在天然气驱的多相组成流模拟中模拟绕过的石油采收率。首先通过使用具有三个无因次组的双孔隙流来定量油的旁路：旁路馏分，通过量比和纵向佩克雷特数。为了表示单孔隙流中绕过的采油量，将新的基于流的流体特征应用于所用流体模型的重质部分。基于双孔隙流中估计的吞吐率来确定伪组分的属性。对各种储层/流体性质的案例研究表明，采用新方法的单孔渗流成功地代表了在岩心驱油实验和精细非均质模拟中观察到的绕过采油。

著录项

  • 作者

    Zhang, Bo.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Civil engineering.
  • 学位 M.S.
  • 年度 2014
  • 页码 235 p.
  • 总页数 235
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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