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Geomechanical and flow implications with continued bioconversion of coal to methane: Experiments and modeling

机译：煤矿持续生物转化与甲烷的地磁和流动影响：实验和建模

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Microbial conversion of coal to methane is a promising technology during transition of coal-based energy from conventional coal mining to natural gas recovery from coal. Significant research advances have been made towards engineering ideal microbial communities and nutrients for bio-stimulation of coal. However, actual field applications require geomechanical and flow behavior characterization of coal during the bioconversion process as well as gas production over the life of the created ?biogenic gas reservoirs?. This study presents the results of an experimental investigation to estimate gas/methane production using bioconversion of coal and analyses of variations in bulk modulus, strain and permeability. Bulk modulus of coal demonstrated time-dependent behavior with continued bioconversion of solid coal. The phenomenon was modeled using mass balancing in a closed environment and the logistic equation based biogenic gas production with time. The modeled gas production and changes in modulus of coal showed excellent agreement with the corresponding experimental results. Next, numerical simulation of biogenic conversion of coal in a constant stress in-situ condition, replicating the Huff ?n Puff method under field conditions, was carried out. The results showed that bioconversion can lead to decrease in effective stress, increase in permeability and decrease in the modulus of coal with time. Repeated recharge of coal with nutrients and recovering the produced gas, that is, sequential cycles of Huff n? Puff, showed further increase in permeability and decrease in coal strength, potentially leading to coal failure in-situ, further increasing the permeability, thus enhancing the prospect of field application of the technology.
机译：煤的微生物转化为甲烷是一种有前途的技术，在煤基能量从常规煤矿到煤中的天然气回收自然气体。对工程理想的微生物社区和煤炭生物刺激的营养素进行了重大研究进展。然而，实际的现场应用需要在生物转化过程中的煤的地质力学和流动性表征，以及产生的生物储层的生物寿命的天然气生产？本研究介绍了使用煤的生物转化估计天然气/甲烷产量的实验研究的结果，并分析了大量模量，菌株和渗透性的变化。大量煤模量明确时间依赖于持续的固体煤的生物转化。在闭合环境中的质量平衡和基于基于Logistic Aquiation的生物天然气生产的时间模拟了该现象。煤模量的模型天然气生产和变化与相应的实验结果表明很好。接下来，进行煤中煤生物转化在恒定应力的数值模拟，在现场条件下复制Huff？N PUFF方法。结果表明，生物转化会导致有效应力下降，渗透性增加，煤模量随时间的增加。用营养成分重复充电，恢复产生的气体，即呼吸的顺序循环n？粉扑，渗透性进一步增加，煤强度降低，可能导致原位煤衰竭，进一步提高渗透性，从而提高了该技术的现场应用前景。

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