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Optimized solvent-aided steam-flooding strategy for recovery of thin heavy oil reservoirs

机译：优化的溶剂辅助蒸汽驱策略，用于稀薄稠油油藏的采收

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摘要

Stochastic optimization based on a simulated annealing method was carried out to determine the optimum steam and steam-solvent flooding strategies in a thin (4 m) heavy oil reservoir both in the absence and presence of a bottom water zone. The steam injection pressure optimization case determined a technically feasible operating strategy. However, the cumulative energy to produced oil ratio (cEOR) realized from the optimized process is high. In comparison, the solvent-aided steam optimization case achieved an operating strategy with a much lower cEOR and cumulative water-to-oil ratio (cWOR) than those in the optimized injection pressure-only strategy. We observed that a solvent-rich channel forms at the top of the reservoir after solvent breakthrough occurs at the production well. The formation of the solvent-rich channel led to oil-solvent mixing at the periphery of the channel as well as heat transfer to oil beyond the channel, which in turn resulted in better recovery performance. In the presence of a bottom water zone, the optimized steam injection pressure optimization strategy was found to perform poorly. However, the optimized solvent-aided strategy achieved superior performance. With solvent injection, the presence of the bottom water zone enhanced mixing of solvent and oil yielding improved oil recovery performance.
机译：进行了基于模拟退火方法的随机优化，以确定在不存在和存在底部水域的情况下，稀薄（4 m）重油油藏中的最佳蒸汽和蒸汽溶剂驱策略。蒸汽喷射压力优化的情况决定了技术上可行的运行策略。然而，通过优化工艺实现的累积能量与成品油之比（cEOR）高。相比之下，溶剂辅助蒸汽优化案例实现的操作策略的cEOR和累积水油比（cWOR）远低于仅优化注射压力策略的情况。我们观察到在生产井中发生溶剂突破后，在储层顶部形成了富溶剂通道。富溶剂通道的形成导致油-溶剂在通道外围混合，以及热量传递到通道外的油中，从而提高了采收率。在存在底部水区的情况下，发现优化的蒸汽注入压力优化策略效果不佳。但是，优化的溶剂辅助策略实现了卓越的性能。通过注入溶剂，底部水区的存在增强了溶剂和油的混合，从而提高了采油性能。

著录项

  • 来源
    《Fuel》 |2013年第10期|50-59|共10页
  • 作者

    David W. Zhao; Jacky Wang; Ian D. Gates;

  • 作者单位

    Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Canada;

    Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Canada;

    Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Canada;

  • 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

    Thin heavy oil reservoirs; Steam-assisted recovery; Solvent-assisted recovery; Energy to oil ratio; Optimization;

    机译：稀薄的重油藏;蒸汽辅助回收;溶剂辅助回收;能量油比;优化;

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