液氮冷浸煤岩孔隙损伤和渗透率演化特性研究

doi:10.13722/j.cnki.jrme.2017.0905

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摘要

为研究冷冲击对煤岩的损伤和增透作用，在液氮冷浸前后对煤岩试样进行核磁共振和渗透率测试，通过T₂分布、T₂谱面积和渗透率的变化来反映煤岩孔隙损伤和渗透率变化情况，并利用传热学理论，研究煤岩温度降与煤岩损伤以及渗透率演化之间的关系。研究结果表明，液氮冷浸能够提高煤岩孔隙数量、孔隙体积和渗透率；煤岩渗透率随冷浸时间的演化表现出先增大后逐渐稳定的趋势；温度降主导着煤岩损伤和渗透率的演化，温度降越大，煤岩损伤越严重、渗透率增幅越大，且温度冲击得到的渗透率与温度降的大小成正比关系，当煤岩温度降达到最大，损伤终止、渗透率不再增加；利用液氮对常温煤岩进行冷浸，最终得到煤岩渗透率增幅为50%～150%。

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	张路路1
	李波1
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	张强1
	任永婕1

关键词 ：岩石力学, 液氮冷浸, 孔隙损伤, 渗透率, 温度降

Abstract：

In order to study the damage and permeability enhancement of coal rock due to cold shock，NMR (nuclear magnetic resonance) and permeability test were conducted firstly before and after liquid nitrogen soaking，by analyzing the changes of T₂ distribution，T₂ spectral area and permeability，pore damage and permeability evolution properties were studied. Then，the relationship between temperature drop and the evolution of pore damage and permeability were discussed. The results showed that the number of pores，the porosity and the permeability of coal rock are increased after liquid nitrogen soaking. Coal rock permeability is improved after first cold soaking circle，but almost has no change in next few circles. The permeability of coal rock increases at first and then tends to be stable with the increase of freezing time. The evolution of coal rock damage and permeability are dominated by temperature drop，the bigger the temperature drop，the more severe the damage and lager permeability increment to coal rock. Coal rock permeability change caused by cold shock is almost linear to temperature drop，when the temperature drop of coal rock reaches the maximum，the damage is terminated and the permeability cannot be increased even though the freezing time is increased. By freezing coal rock at room temperature with liquid nitrogen，the permeability increment of coal rock is between 50%–150%.

Key words： rock mechanics liquid nitrogen soaking pore damage permeability temperature drop

引用本文:

张路路1，李波1，2，张强1，任永婕1. 液氮冷浸煤岩孔隙损伤和渗透率演化特性研究[J]. 岩石力学与工程学报, 2018, 37(S2): 3938-3946.
ZHANG Lulu1，LI Bo1，2，ZHANG Qiang1，REN Yongjie1. Study on pore damage and permeability evolution properties of coal rock caused by liquid nitrogen soaking. , 2018, 37(S2): 3938-3946.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0905 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS2/3938

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