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

Abstract
Figure/Table
References (24)
Related Citation (15)

Download: PDF (479 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

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

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	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.

URL:

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

[1] FINNIE I，COOPER G A，BERLIE J. Fracture propagation in rock by transient cooling[J]. International Journal of Rock Mechanics and Mining Sciences，1979，16(1)：11–21.

[2] NICHOLOSON D T，NICHOLOSON F H. Physical deterioration of sedimentary rocks subjected to experimental freeze-thaw weathering[J]. Earth Surface Processes and Landforms，2000，25(12)：1 295–1 307.

[3] YAMABE T，NEAUPANE K M. Determination of some thermo- mechanical properties of Sirahama sandstone under subzero temperature conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(7)：1 029–1 034.

[4] KIM K，KEMENY J，NICKERSON M. Effect of rapid thermal cooling on mechanical rock properties[J]. Rock Mechanics and Rock Engineering，2014，47(6)：2 005–2 019.

[5] CAI C Z，LI G S，HUANG Z W，et al. Experiment of coal damage due to super-cooling with liquid nitrogen[J]. Journal of Natural Gas Science and Engineering，2015，22：42–48.

[6] KENJI A，KEISUKE H，TAKEHISA Y. Storage of refrigerated liquefied gases in rock caverns：characteristics of rock under very low temperatures[J]. Tunnelling and Underground Space Technology，1990，5(4)：319–325.

[7] 蒋立浩，陈有亮，刘明亮. 高低温冻融循环条件下花岗岩力学性能试验研究[J]. 岩土力学，2011，32(增2)：319–323.(JIANG Lihao，CHEN Youliang，LIU Mingliang. Experimental study of mechanical properties of granite under high/low temperature freeze-thaw cycles[J]. Rock and Soil Mechanics，2011，32(Supp.2)：319–323.(in Chinese))

[8] 张继周，缪林昌，杨振峰. 冻融条件下岩石损伤劣化机制和力学特性研究[J]. 岩石力学与工程学报，2008，27(8)：1 688–1 694. (ZHANG Jizhou，MIAO Linchang，YANG Zhenfeng. Research on rock degradation and deterioration mechanisms and mechanical characteristics under cyclic freezing-thawing[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(8)：1 688–1 694.(in Chinese))

[9] 何国梁，张磊，吴刚. 循环冻融条件下岩石物理特性的试验研究[J]. 岩土力学，2004，25(增2)：52–56.(HE Guoliang，ZHANG Lei，WU Gang. Test study on physical characteristics of rock under freezing-thawing cycles[J]. Rock and Soil Mechanics，2004，25(Supp.2)：52–56.(in Chinese))

[10] KIM M，KEMENY J. Effect of thermal shock and rapid unloading on mechanical rock properties[J]. Rock Mechanics and Rock Engineering，2009，47(6)：2 005–2 019.

[11] 蔡承政，李根生，黄中伟，等. 液氮冻结条件下岩石孔隙结构损伤试验研究[J]. 岩土力学，2014，35(4)：965–971.(CAI Chengzheng，LI Gensheng，HUANG Zhongwei，et al. Experiment study of rock porous structure damage under cryogenic nitrogen freezing[J]. Rock and Soil Mechanics，2014，35(4)：965–971.(in Chinese))

[12] 张春会，李伟龙，王锡朝，等.液氮溶浸煤致裂的机理研究[J]. 河北科技大学学报，2015，36(4)：425–430.(ZHANG Chunhui，LI Weilong，WANG Xichao，et al. Fracturing mechanism of coal subjected to liquid nitrogen cooling[J]. Journal of Hebei University of science and technology，2015，36(4)：425–430.(in Chinese))

[13] CAI C Z，LI G S，HUANG Z W，et al. Experimental study of the effect of liquid nitrogen cooling on rock pore structure[J]. Journal of Natural Gas Science and Engineering，2014，21：507–517.

[14] 蔡承政，李根生，黄中伟，等. 液氮压裂中液氮对岩石破坏的影响试验[J]. 中国石油大学学报：自然科学版，2014，38(4)：507–517. (CAI Chengzheng，LI Gensheng，HUANG Zhongwei，et al. Experimental study on effect of liquid nitrogen on rock failure during cryogenic nitrogen fracturing[J]. Journal of China University of Petroleum：Natural Science，2014，38(4)：507–517.(in Chinese))

[15] 任韶然，范志坤，张亮，等. 液氮对煤岩的冷冲击作用机制及试验研究[J]. 岩石力学与工程学报，2013，32(增2)：3 790–3 794. (REN Shaoran，FAN Zhikun，ZHANG Liang，et al. Mechanisms and experimental study of thermal-shock effect on coal-rock using liquid nitrogen[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(Supp.2)：3 790–3 794.(in Chinese))

[16] PARK C，CHEON D S，SYNN J H，et al. Experimental study on thermal and mechanical characteristics of rock at low temperature[C]// Impact of Human Activity on the Geological Environment EUROCK 2005：Proceedings of the International Symposium EUROCK 2005. Brno，Czech Republic：CRC Press，2005：447–453.

[17] FREIRE-LISTA D M，FORT R，VARAS-MURIEL M J. Freeze–thaw fracturing in building granites[J]. Cold Regions Science and Technology，2015，113：40–51.

[18] 吴刚，何国梁，张磊，等. 大理岩循环冻融试验研究[J]. 岩石力学与工程学报，2006，25(增1)：2 930–2 938.(WU Gang，HE Guoling，ZHANG Lei，et al. Experimental study on cycles of freeze-thaw of marble[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)：2 930–2 938.(in Chinese))

[19] 运华云，赵文杰，刘兵开，等. 利用T₂分布进行岩石孔隙结构研究[J]. 测井技术，2002，26(1)：18–21.(YUN Huayun，ZHAO Wenjie，LIU Bingkai，et al. Researching rock pore structure with T₂ distribution[J]. Well Logging Technology，2002，26(1)：18–21.(in Chinese))

[20] 肖立志. 岩石核磁共振研究进展及其应用[J]. 测井技术，1996，20(1)：27–31.(XIAO Lizhi. Development on nuclear magnetic resonance in rock samples and its applications[J]. Well Logging Technology，1996，20(1)：27–31.(in Chinese))

[21] TRAN D，SETTARI A，NGHIEM L. Initiation and propagation of secondary cracks in thermo-poroelastic media[C]// The 46th US Rock Mechanics/Geomechanics Symposium. Chicago，Illinois：American Rock Mechanics Association，2012：1 932–1 942.

[22] 张春会，王来贵，赵全胜，等. 液氮冷却煤变形–破坏–渗透率演化模型及数值分析[J]. 河北科技大学学报，2015，36(1)：90–98. (ZHANG Chunhui，WANG Laigui，ZHAO Quansheng，et al. Permeability evolution model numerical analysis of coupled coal deformation，failure and liquid nitrogen cooling[J]. Journal of Hebei University of Science and Technology，2015，36(1)：90–98.(in Chinese))

[23] 程靳，赵树山. 断裂力学[M]. 北京：科学出版社，2006：57–67.(CHENG Jin，ZHAO Shushan. Fracture mechanics[M]. Beijing：Science Press，2006：57–67.(in Chinese))

[24] WEN H，LU J H，XIAO Y，et al. Temperature dependence of thermal conductivity，diffusion and specific heat capacity for coal and rocks from coalfield[J]. Thermochimica Acta，2015，619：41–47.