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Laboratory measurement and modeling of coal permeability with continued methane production: Part 1 - Laboratory results

机译:连续生产甲烷的煤渗透率的实验室测量和建模:第1部分-实验室结果

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This paper, first of a two-part series, discusses the results of a laboratory-scale study completed to establish the permeability variation trend with continued production of methane from coal-gas reservoirs. The field condition of uniaxial strain, assumed in the analytical models developed for permeability prediction, was replicated in the study. The results showed that the permeability of coal increases continuously, the rate of increase accelerating at low pressures. The primary reason for the increase appears to be the decrease in horizontal stress resulting from the sorption-induced volumetric strain, the so called "matrix shrinkage" effect. In the second part, experimental data is used to validate the commonly used permeability prediction analytical models and present a modification for one to improve its ability to predict permeability changes.
机译:本文是一个分为两部分的系列文章中的第一部分,讨论了完成实验室规模研究的结果,以确立随着煤层气藏不断产生甲烷而产生的渗透率变化趋势。在研究中复制了在为渗透率预测开发的分析模型中假设的单轴应变的场条件。结果表明,煤的渗透率持续增加,在低压下增加速率加快。增大的主要原因似乎是由吸附引起的体积应变引起的水平应力减小,即所谓的“基体收缩”效应。在第二部分中,实验数据用于验证常用的渗透率预测分析模型,并对模型进行修改以提高其预测渗透率变化的能力。

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