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Relative Permeability of Coal: A Review

机译：煤的相对渗透率：综述

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Coalbed methane (CBM), once a hazard to the undermining safety, is becoming an important addition to the global energy Supply. Injecting carbon dioxide (CO_2) into coal seams not only aids to enhance CBM production but also offers an option of CO_2 sequestration helpful for the reduction of greenhouse gas release. Multiphase flow occurs in those cases as most coalbeds are initially saturated with water. Accurate determination of relative permeability of coal plays an important role in the prediction and evaluation of those operations because it is in effect the effective permeability (absolute permeability multiplied by relative permeability) to gas/water rather than absolute permeability that controls the flow in coal seams. To date, varying methods have been reported of obtaining relative permeability curves of coals through either laboratory tests or field data analysis, which are reviewed in this paper. Also, this paper includes a summary of the characteristics of relative permeability curves of coals, relative permeability models, effects of varying factors on curves and effects of the curves on CBM production. This paper concludes that despite the importance of relative permeability in CBM-related operation process, limited research efforts have been paid on improvements concerning this subject in the past two decades: the advance in the research of relative permeability-related subjects can barely keep up with the rate at which the developments of CBM and CO_2-ECBM projects are booming worldwide. More efforts are needed to conduct related investigations such that a reliable standard or workflow can be established that can as accurately determine coal relative permeability with repeatability.
机译：曾经危害安全的煤层气（CBM）现已成为全球能源供应的重要补充。向煤层中注入二氧化碳（CO_2）不仅有助于提高煤层气的产量，而且还提供了固存CO_2的选项，有助于减少温室气体的释放。在这些情况下会发生多相流，因为大多数煤层最初都被水饱和。准确确定煤的相对渗透率在预测和评估这些操作中起着重要作用，因为它实际上是控制气体/水的有效渗透率（绝对渗透率乘以相对渗透率），而不是控制煤层流动的绝对渗透率。 。迄今为止，已经报道了通过实验室测试或现场数据分析获得煤的相对渗透率曲线的各种方法，本文对此进行了综述。此外，本文还概述了煤的相对渗透率曲线的特征，相对渗透率模型，各种因素对曲线的影响以及曲线对煤层气产量的影响。本文的结论是，尽管相对渗透率在与煤层气有关的作业过程中很重要，但在过去的二十年中，人们对该方面的改进研究投入有限：相对渗透率相关研究的进展几乎跟不上全球范围内煤层气和CO_2-ECBM项目的发展速度很高。需要做更多的工作来进行相关的调查，以便可以建立一个可靠的标准或工作流程，该标准或流程可以准确地确定具有重复性的煤相对渗透率。

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