磁流体动力学效应对粘土质多孔介质中流体流动的经验研究

Q1 Earth and Planetary Sciences
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引用次数: 0

摘要

由于流体与岩石表面之间复杂的相互作用,尤其是粘土膨胀,提高粘土油藏的石油采收率是石油工业面临的一项重大挑战。本研究首次对磁场对粘土多孔介质中流体流动的影响进行了实证分析。我们的核心研究结果表明,在粘土质介质中,对水进行磁处理可将石油采收率平均提高 15-30%,而在纯石英介质中效果有限。详细的实验揭示了磁处理提高采收率的原因在于减轻了粘土表面的膨胀并改变了其磁性能;与纯石英砂相比,在多孔介质中引入 30% 的粘土会使采收率降低 32%。将粘土加热到约 1000 °C,以降低其膨胀特性,回收率仅提高了 16%,这表明磁处理并不完全归因于粘土膨胀的缓解。用盐酸处理粘土表面的铁磁性薄膜,生成非磁性的 FeCl3,可获得与无粘土介质类似的高回收率。此外,还确定了 43760-51740 A/m 的磁场强度是粘土介质中流体置换的最佳磁场强度。值得注意的是,磁场强度为 47760 A/m 时,30% 粘土介质的回收率提高到 84.5%,而未经处理的回收率仅为 49.7%。有趣的是,观察发现最大流速与介质间的零电位差有关,这为确定最佳磁场强度提供了一种更快的方法。最后,我们还研究了 "磁记忆 "的概念,即磁场消除后的持续影响。我们的研究结果表明,压力累积时间的稳定性在处理后持续 10 天,之后水的行为会恢复,粘土膨胀会重新开始。通过对磁场应用的时间动态的了解,我们可以更深入地理解磁场对粘土储层流体流动的长期影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Empirical study of magnetohydrodynamic effect on fluid flow in clayey porous media

Enhancing oil recovery from clayey reservoirs is a significant challenge in petroleum industry due to complex interactions between fluids and rock surfaces, particularly clay swelling. This study presents the first empirical analysis of magnetic fields' impact on fluid flow in clayey porous media. Our core findings indicate that magnetic treatment of water increases oil recovery by an average of 15–30% in clayey media, with limited effectiveness in pure quartz media. Detailed experiments unraveled that improved recovery factor by magnetic treatment stem from both mitigated swelling and altered magnetic properties at clay surface; introducing 30% clay to porous medium decreased the recovery by 32% compared to pure quartz sand. Heating the clay to around 1000 °C to reduce its swelling property improved the recovery by only 16%, suggesting magnetic treatment is not solely attributed to clay swelling mitigation. Treating ferromagnetic films at clay surface with HCl to produce non-magnetic FeCl3 resulted in a high recovery factor, similar to the clay-free medium. Moreover, it was determined that a magnetic field intensity of 43760–51740 A/m is optimal for fluid displacement in clayey media. Notably, the intensity of 47760 A/m increased recovery to 84.5% in a 30% clay medium, compared to 49.7% without treatment. Interestingly, it was observed that the maximum flow rate was associated with zero potential difference across the medium, providing a faster method to determine the optimum magnetic field intensity. Lastly, the concept of ‘Magnetic memory’ was investigated, referring to the persistence of magnetic field's influence after its removal. Our findings indicated that pressure build-up time stability lasted 10 days post-treatment, after which water behavior reverts, and clay swelling resumes. This insight into the temporal dynamics of magnetic field application provides a deeper understanding of its long-term impacts on fluid flow in clayey reservoirs.

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来源期刊
Petroleum Research
Petroleum Research Earth and Planetary Sciences-Geology
CiteScore
7.10
自引率
0.00%
发文量
90
审稿时长
35 weeks
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