基于核磁共振技术和压汞法的液氮冻融煤体孔隙结构损伤演化规律试验研究

doi:10.13722/j.cnki.jrme.2021.1072

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (61974 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为了研究液氮冻融循环作用下煤体的孔隙结构损伤演化规律，采用图像分析法、核磁共振和压汞法对液氮冻融作用下煤样的表面裂隙扩展、孔隙度、束缚水体积、自由水体积、孔容、比表面积和孔径分布的演化规律进行研究。研究结果表明：(1) 随着液氮冻融循环次数的增加，煤样的原生裂隙逐渐扩展、连通并产生次生裂隙，冻融次数达到一定程度后，各孤立的裂隙相互连接形成具有主裂隙和次生裂隙的裂隙网络；(2) 液氮冻融能够促进煤体孔隙发育，煤样的微孔和小孔逐渐扩展、发育连通从而形成中孔和大孔，造成煤样的孔隙连通性增强，束缚水体积比例减小，自由水体积比例增大，总孔隙度、残余孔隙度和有效孔隙度增大；(3) 液氮冻融后煤样的孔隙数量增多，孔径增大，在部分区域形成孔隙密集区并连接形成微裂隙；(4) 液氮冻融后煤样的总孔容和比表面积增加，孔容的变化主要集中在中孔和大孔，煤样的微小孔逐渐向中孔和大孔转化，导致煤样中孔和大孔的比例上升。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	楚亚培1
	2
	3
	4
	张东明2
	3
	王满4
	刘恒1
	吴旭阳1
	翟攀攀1
	申通1

关键词 ：岩石力学, 液氮冻融, 孔隙结构, 核磁共振, 核磁共振成像, 压汞法

Abstract：To study the damage characteristics of the pore structure of coal samples under the action of liquid nitrogen (LN2) freeze-thaw，image analysis，nuclear magnetic resonance(NMR) technique and mercury intrusion were used to analyze the evolution law of fracture expansion，porosity，bound fluid volume，free fluid volume，pore volume，specific surface area and pore size distribution of coal samples under LN2 freeze-thaw. The experimental results show that：(1) The primary fracture gradually expands and connects to form secondary fracture with increasing the number of LN2 freeze-thaw cycles，and the isolated fractures are connected to form fracture network with primary and secondary fractures after the number of freeze-thaw cycles reaches a certain level. (2) LN2 freeze-thaw can promote the development of pores，and the micropores and minipores of coal samples gradually expand，develop and connect to form mesopores and macropores after LN2 freeze-thaw，resulting in enhanced pore connectivity of coal samples，a decrease in the proportion of the bound fluid and increase in the proportion of the free fluid，and the increase of the total porosity，the residual porosity and the effective porosity. (3) The number of pores and the pore size increases after LN2 freeze-thaw，and the pore density in some areas continues to increase and expand to form microfractures. (4) The total pore volume and the specific surface area of coal samples increases after LN2 freeze-thaw，and the change of the pore volume is mainly concentrated in the mespores and macropores. The micropres of coal sample gradually transform to the mesopores and macropores，which leads to the increase of proportion of mesopores and macropores.

Key words： rock mechanics liquid nitrogen freeze-thaw pore structure nuclear magnetic resonance(NMR) nuclear magnetic resonance imaging(MRI) mercury intrusion method

引用本文:

楚亚培1，2，3，4，张东明2，3，王满4，刘恒1，吴旭阳1，翟攀攀1，申通1. 基于核磁共振技术和压汞法的液氮冻融煤体孔隙结构损伤演化规律试验研究[J]. 岩石力学与工程学报, 2022, 41(9): 1820-1831.
CHU Yapei1，2，3，4，ZHANG Dongming2，3，WANG Man4，LIU Heng1，WU Xuyang1，ZHAI Panpan1，SHEN Tong1. Experiment study on influence of liquid nitrogen freeze-thaw on pore structure of coal based on nuclear magnetic resonance technology and mercury intrusion methods. , 2022, 41(9): 1820-1831.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1072 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I9/1820

[8]	袁亮，林柏泉，杨威. 我国煤矿水力化技术瓦斯治理研究进展及发展方向[J]. 煤炭科学技术，2015，43(1)：45–49.(YUAN Liang，LIN Baiquan，YANG Wei. Research progress and development direction of gas control with mine hydraulic technology in China coal mine[J]. Coal Science and Technology，2015，43(1)：45–49.(in Chinese))
[18]	张春会，刘泮森，王锡朝，等. 焦煤和无烟煤的液氮冷冻致裂效果对比试验[J]. 煤炭科学技术，2017，45(6)：30–34.(ZHANG Chunhui，LIU Pansen，WANG Xichao，et al. Contrast test study on fracturing anthracite and coking coal by liquid nitrogen cooling[J]. Coal Science and Technology，2017，45(6)：30–34.(in Chinese))
[25]	QIN L，ZHAI C，XU J，et al. Evolution of the pore structure in coal subjected to freeze-thaw using liquid nitrogen to enhance coalbed methane extraction[J]. Journal of Petroleum Science and Engineering，2019，175：129–139.
[28]	张先伟，孔令伟. 利用扫描电镜，压汞法，氮气吸附法评价近海黏土孔隙特征[J]. 岩土力学，2013，34(增2)：134–142.(ZHANG Xianwei，KONG Liuwei. Study of pore characteristics of offshore clay by SEM and MIP and NA methods[J]. Rock and Soil Mechanics，2013，34(Supp.2)：134–142.(in Chinese))
[30]	黄诗冰，刘泉声，程爱平，等. 低温岩体裂隙冻胀力与冻胀扩展试验初探[J]. 岩土力学，2018，39(1)：78–84.(HUANG Shibing，LIU Quansheng，CHENG Aiping，et al. Preliminary experimental study of frost heaving pressure in crack and frost heaving propagation in rock mass under low temperature[J]. Rock and Soil Mechanics，2018，39(1)：78–84.(in Chinese))
[6]	刘生龙，朱传杰，林柏泉，等. 水力割缝空间分布模式对煤层卸压增透的作用规律[J]. 采矿与安全工程学报，2020，37(5)：983–990.(LIU Shenglong，ZHU Chuanjie，LIN Baiquan，et al. The effect of spatial distribution mode of hydraulic slotting on pressure relief and permeability enhancement of the coal seam[J]. Journal of Mining and Safety Engineering，2020，37(5)：983–990.(in Chinese))
[16]	张春会，郭晓康，李和万，等. 液氮溶浸对饱水煤裂隙扩展的影响研究[J]. 煤炭科学技术，2016，44(6)：99–105.(ZHANG Chunhui，GUO Xiaokang，LI Hewan，et al. Study on influence of liquid nitrogen infiltration to saturated water coal fracture expanded[J]. Coal Science and Technology，2016，44(6)：99–105.(in Chinese))
[26]	ZHAI C，QIN L，LIU S，et al. Pore structure in coal：pore evolution after cryogenic freezing with cyclic liquid nitrogen injection and its implication on coalbed methane extraction[J]. Energy and Fuels，2016，30(7)：6 009–6 020.
[1]	秦勇，袁亮，胡千庭，等. 我国煤层气勘探与开发技术现状及发展方向[J]. 煤炭科学技术，2012，40(10)：1–6.(QIN Yong，YUAN Liang，HU Qianting，et al. Status and development orientation of coal bed methane exploration and development technology in China[J]. Coal Science and Technology，2012，40(10)：1–6.(in Chinese))
[2]	吴拥政，康红普. 煤柱留巷定向水力压裂卸压机制及试验[J]. 煤炭学报，2017，42(5)：1 130–1 137.(WU Yongzheng，KANG Hongpu. Pressure relief mechanism and experiment of directional hydraulic fracturing in reused coal pillar roadway[J]. Journal of China Coal Society，2017，42(5)：1 130–1 137.(in Chinese))
[4]	蔡峰，刘泽功. 深部低透气性煤层上向穿层水力压裂强化增透技术[J]. 煤炭学报，2016，41(1)：113–119.(CAI Feng，LIU Zegong . Simulation and experimental research on upward cross-seams hydraulic fracturing in deep and low-permeability coal seam[J]. Journal of China Coal Society，2016，41(1)：113–119.(in Chinese))
[11]	薛斐. 水力冲孔煤层增透机制及应用研究[博士学位论文][D]. 北京：中国矿业大学，2018.(XUE Fei. Study on pressure relief mechanism of hydraulic flushing in coal seams and its application[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2018.(in Chinese))
[12]	胡杰，孙臣. 穿层水力冲孔措施在低透煤层中有效影响半径效果考察[J]. 中国安全生产科学技术，2017，13(10)：48–52.(HU Jie，SUN Chen. Effect inspection on effective impact radius of hydraulic flushing measures by perforated drilling holes in low permeability coal seam[J]. Journal of Safety Science and Technology，2017，13(10)：48–52.(in Chinese))
[14]	GRUNDMANN S，RODVELT G，DIALS G，et al. Cryogenic nitrogen as a hydraulic fracturing fluid in the devonian shale[C]// SPE Eastern Regional Meeting. [S. l.]：[s. n.]，1998：1–6.
[21]	王登科，孙刘涛，魏建平. 温度冲击下煤的微观结构变化与断裂机制[J]. 岩土力学，2019，40(2)：529–538.(WANG Dengke，SUN Liutao，WEI Jianping. Microstructure evolution and fracturing mechanism of coal under thermal shock[J]. Rock and Soil Mechanics，2019，40(2)：529–538.(in Chinese))
[22]	王登科，张平，浦海，等. 温度冲击下煤体裂隙结构演化的显微CT实验研究[J]. 岩石力学与工程学报，2018，37(10)：2 243–2 252.(WANG Dengke，ZHANG Ping，PU Hai，et al. Microstructure evolution and fracturing mechanism of coal under thermal shock[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(10)：2 243–2 252.(in Chinese))
[24]	卢硕，张磊，薛俊华，等. 液氮溶浸作用对不同煤阶煤样渗流特性的影响[J]. 煤炭学报，2020，45(5)：1 835–1 844.(LU Shuo，ZHANG Lei，XUE Junhua，et al. Influence of liquid nitrogen immersion on seepage characteristics of different rank coal samples[J]. Journal of China Coal Society，2020，45(5)：1 835–1 844.(in Chinese))
[9]	张荣. 复合煤层水力冲孔卸压增透机制及高效瓦斯抽采方法研究[博士学位论文][D]. 徐州：中国矿业大学，2019.(ZHANG Rong. Research on the stress relief and permeability increase mechanism and high-efficiency gas drainage method on a composite coal seam[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2019.(in Chinese))
[19]	李和万，左建平，王来贵，等. 液氮冷加载对围压煤体结构损伤的影响规律研究[J]. 采矿与安全工程学报，2020，37(4)：804–811.(LI Hewan，ZUO Jianping，WANG Laigui，et al. Effect of cold loading by liquid nitrogen on structural damage of coal[J]. Journal of Mining and Safety Engineering，2020，37(4)：804–811.(in Chinese))
[29]	楚亚培. 液氮冻融煤体孔隙裂隙结构损伤演化规律及增渗机制研究[博士学位论文][D]. 重庆：重庆大学，2020.(CHU Yapei. Study on the damage evolution law of pore and fracture structure of coal under liquid nitrogen freeze-thaw and the mechanism of permeability enhancing[Ph. D. Thesis][D]. Chongqing：Chongqing University，2020. (in Chinese))
[3]	康向涛，江明泉，黄滚，等. 多煤层联合水压裂缝扩展规律应用研究[J]. 采矿与安全工程学报，2021，38(3)：602–608.(KANG Xiangtao，JIANG Mingquan，HUANG Gun，et al. Application research on fracture propagation law of combined hydraulic pressure in multiple coal seams[J]. Journal of Mining and Safety Engineering，2021，38(3)：602–608.(in Chinese))
[5]	王耀锋，何学秋，王恩元，等. 水力化煤层增透技术研究进展及发展趋势[J]. 煤炭学报，2014，39(10)：945–955.(WANG Yaofeng，HE Xueqiu，WANG Enyuan，et al. Research progress and development tendency of the hydraulic technology for increasing the permeability of coal seams[J]. Journal of China Coal Society，2014，39(10)：945–955.(in Chinese))
[7]	林柏泉，刘厅，邹全乐，等. 割缝扰动区裂纹扩展模式及能量演化规律[J]. 煤炭学报，2015，40(4)：719–727.(LIN Baiquan，LIU Ting，ZOU Quanle，et al. Crack propagation modes and energy evolution within slotting disturbed zone[J]. Journal of China Coal Society，2015，40(4)：719–727.(in Chinese))
[10]	刘东，刘文. 水力冲孔压裂卸压增透抽采瓦斯技术研究[J]. 煤炭科学技术，2019，47(3)：136–141.(LIU Dong，LIU Wen. Research on gas extraction technology：hydraulic stamping and hydro fracture to pressure relief and permeability improvement[J]. Coal Science and Technology，2019，47(3)：136–141.(in Chinese))
[13]	MCDANIEL B，GRUNDMANN S，KENDRICK W，et al. Field applications of cryogenic nitrogen as a hydraulic-fracturing fluid[J]. Journal of Petroleum Technology，1998，50(3)：38–39.
[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))
[17]	张春会，张海霞，于永江，等. 饱水度和再溶浸对液氮冷冻煤致裂的影响[J]. 煤炭学报，2016，41(增2)：400–406.(ZHANG Chunhui，ZHANG Haixia，YU Yongjiang，et al. Effects of saturation and resubmersion on coal fracturing subjected to liquid nitrogen shock[J]. Journal of China Coal Society，2016，41(Supp.2)：400–406.(in Chinese))
[20]	李和万，刘戬，王来贵，等. 液氮冷加载对不同节理煤样结构损伤的影响[J]. 煤炭学报，2020，45(11)：3 833–3 840.(LI Hewan，LIU Jian，WANG Laigui，et al. Effect of liquid nitrogen on structural damage of coal samples with different joints[J]. Journal of China Coal Society，2020，45(11)：3 833–3 840.(in Chinese))
[23]	魏建平，孙刘涛，王登科，等. 温度冲击作用下煤的渗透率变化规律与增透机制[J]. 煤炭学报，2017，42(8)：1 919–1 925.(WEI Jianping，SUN Liutao，WANG Dengke，et al. Change law of permeability of coal under temperature impact and the mechanism of increasing permeability[J]. Journal of China Coal Society，2017，42(8)：1 919–1 925.(in Chinese))
[27]	QIN L，ZHAI C，LIU S，et al. Changes in the petrophysical properties of coal subjected to liquid nitrogen freeze-thaw-A nuclear magnetic resonance investigation[J]. Fuel，2017，194：102–114.