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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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

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	Articles by authors
	ZHANG Lulu1
	LI Bo1
	2
	ZHANG Qiang1
	REN Yongjie1

Cite this article:

ZHANG Lulu1,LI Bo1,2, et al. Study on pore damage and permeability evolution properties of coal rock caused by liquid nitrogen soaking[J]. , 2018, 37(S2): 3938-3946.

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

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