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Lean gas Huff and Puff process for Eagle Ford Shale: Methane adsorption and gas trapping effects on EOR

机译：Eagle Ford Shale的瘦气体和吹水过程：甲烷吸附和燃气捕获效果对EOR

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摘要

In order to improve the current recovery factor of unconventional reservoirs and take it to the next level (10-20%), gas Huff and Puff is a very promising enhanced oil recovery technology used currently. Many laboratory works and field pilot tests have been conducted recently. However, most of the research work is based on CO2 as an injected gas. Few of them were built upon the more realistic lean gas Huff and Puff process. From the feedback of lean gas Huff and Puff pilot in Eagle Ford, the field response is always beyond analysis and reservoir simulation forecast. Methane, the main component of lean gas, and its adsorption and desorption effects on the unconventional resources are pronounced due to nanopore confinement effects and a much larger surface area than conventional reservoirs. On the other hand, the minimum miscibility pressure of lean gas in Eagle Ford is high ( 4000 psi), which makes gas phase and liquid phase still separate in a long period of Huff and Puff process before reservoir pressure is elevated high enough to developing the supercritical state. Therefore, relative permeability hysteresis - gas trapping effect in nature, should be also very significant on gas EOR performance for unconventional resources. To our best knowledge, there are no such studies about the lean gas adsorption and gas trapping for Huff and Puff process of unconventional reservoir reported so far. In this study, these two mechanisms are systematically analyzed and quantified in a compositional reservoir simulation study. The gas EOR dependence on permeability is also studied and the resulting gas injectivity problem is answered, trying to explore the real problem encountered in the pilot practice.
机译：为了改善非传统水库的当前恢复因子，将其带到下一级（10-20％），气体Huff和Puff是目前使用的非常有前途的增强型石油回收技术。最近进行了许多实验室工作和现场试验试验。然而，大多数研究工作基于CO2作为注入的气体。其中很少有人建造在更现实的瘦气体和泡芙过程中。从Eagle Ford中的瘦气沟和Puff飞行员的反馈中，野外响应总是超越分析和储层模拟预测。由于纳米Ober监禁效应和比传统储层更大的表面积，甲烷，瘦气体的主要成分及其对非传统资源的吸附和解吸效应的吸附和解吸效应都是明显的。另一方面，Eagle Ford中贫气体的最小混溶性压力高（> 4000psi），使气相和液相仍然在长时间的河流和泡芙过程中分离，并且在储层压力升高到足够高以发展超临界状态。因此，相对渗透性滞后 - 气体捕获效果本质上，对燃气EOR性能对非传统资源的性能也非常显着。为了我们的最佳知识，目前迄今为止报告的非传统水库的呼吸气体吸附和气体诱捕的研究没有这样的研究。在该研究中，在组成储层模拟研究中系统地分析和量化这两种机制。还研究了气体EOR对渗透性的依赖性，并回答了所得的气体注射率问题，试图探讨试点实践中遇到的真正问题。

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  • 来源
    《Fuel》 |2019年第jul15期|143-151|共9页
  • 作者

    Wang Mingwei; Wang Leizheng; Zhou Wen; Yu Wei;

  • 作者单位

    Chengdu Univ Technol Geol Resources & Geol Engn Chengdu 610059 Sichuan Peoples R China;

    Univ Texas Austin Hildebrand Dept Petr & Geosyst Engn Austin TX 78712 USA;

    Chengdu Univ Technol Geol Resources & Geol Engn Chengdu 610059 Sichuan Peoples R China;

    Univ Texas Austin Hildebrand Dept Petr & Geosyst Engn Austin TX 78712 USA;

  • 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

    Lean gas; Huff and Puff; Eagle Ford; Methane adsorption; Gas trapping;

    机译：瘦气体;Huff和Puff;Eagle Ford;甲烷吸附;气体捕获;

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