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Effects of effective stress changes on permeability of latrobe valley brown coal

机译：有效应力变化对拉特罗布河谷褐煤渗透性的影响

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摘要

One of the key issues with geological sequestration of carbon dioxide in coal seams is change of permeability caused by carbon dioxide (CO_2) injection, and especially any resulting reduction in injectivity. Injection causes changes in pressure and effective stress, with further changes caused by coal matrix swelling associated with adsorption of CO_2. In this paper we aim to study how the change in effective stress and coal swelling may influence the gas permeability in brown coal using natural coal and reconstituted coal specimens. Tests were conducted at different confining pressures to represent conditions at different depths. Different gas injection pressures were also employed at each confining stress stage. The test results clearly depicted an exponential reduction of coal permeability to CO_2 gas when effective stress increases. Based on the experimental results, an empirical correlation to represent the effect of stress on permeability was developed. The results also showed that increase in pore pressure can induce further swelling of the coal specimens, and this can lead to further decrease in permeability which can have important impact on field injectivity. Test results for natural brown coal specimens were compared with results of tests on reconstituted coal specimens made from compaction of coal particles obtained from crushing of blocks of natural coal. Observed permeability behaviour of gas in reconstituted coal was similar to the natural coal specimen permeability trend, when effective stress increases.
机译：煤层中二氧化碳的地质隔离的关键问题之一是由于注入二氧化碳（CO_2）引起的渗透率变化，尤其是导致注入性降低的原因。注入会引起压力和有效应力的变化，而煤基质膨胀会伴随着CO_2的吸附而引起进一步的变化。在本文中，我们旨在研究使用天然煤和再生煤样本，有效应力和煤溶胀的变化如何影响褐煤的透气性。在不同的围压下进行测试以代表不同深度的条件。在每个限制应力阶段还采用了不同的气体注入压力。测试结果清楚地表明，当有效应力增加时，煤对CO_2气体的渗透率呈指数下降。根据实验结果，建立了一种表示应力对渗透率影响的经验相关性。结果还表明，孔隙压力的增加可引起煤样品的进一步溶胀，这可导致渗透率的进一步降低，这可能对油田注入性产生重要影响。将天然褐煤样品的测试结果与通过压缩天然煤块获得的煤颗粒压实制成的再生煤样品的测试结果进行了比较。当有效应力增加时，观察到的重构煤中气体的渗透性行为类似于天然煤样品的渗透性趋势。

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