CO2相变致裂煤的纳米孔隙尺度改造效应

doi:10.13722/j.cnki.jrme.2022.0408

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (23702 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract To investigate the transformed effect of nano-pores structure and its control on gas transport in coal under different pressures of CO2 phase transition fracturing(CO2-PTF)，the experiments of coal induced with CO2-PTF were carried out under the fracturing pressures of 120，150 and 185 MPa. The structure evolution characteristics of macro-pores(＞50 nm)，meso-pores(2–50 nm) and micro-pores(＜2 nm) were analyzed by the comprehensive measurements of high-pressure mercury injection，low-temperature liquid nitrogen adsorption and low-temperature CO2 adsorption. The results show that CO2-PTF has pore-enlarging effect for macro-pores and meso-pores. The average pore size and pore volume of macro-pores increase significantly，while the pore surface area decreases. The average pore size of meso-pores increases，while the pore surface area decreases obviously. The pore connectivity improves greatly. It is hard to transform the micro-pores with chemical properties by the declined fracturing pressure of CO2-PTF due to the fracturing pressure expanding preferentially from fractures and large-scale pores in the short duration. The pore enlarging effect of CO2-PTF for macro-pores and meso-pores enhanced with the fracturing pressure. The distribution of macro-pores，meso-pores and micro-pores is obvious differences in coals with different metamorphic and deformation degrees. Therefore，the research of “high fracturing pressure-long action duration - high energy” CO2-PTF device will contribute to further enhance the pore enlarging effect，improve the gas transport channel with nano-scale and promote the gas drainage efficiency. The research results provide a scientific basis for the optimization and improvement of CO2-PTF technology.

Key words： coalmine gas CO2 phase transition fracturing pore structure fracturing pressure scale effect

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Zhen1
	LIU Gaofeng1
	2
	3
	LI Baolin1
	LIU Huan1
	SI Nian1
	GUAN Wenbo1

Cite this article:

ZHANG Zhen1,LIU Gaofeng1,2, et al. Transformed effect of nano-pores in coal by CO2 phase transition fracturing[J]. , 2023, 42(3): 672-684.

URL:

http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0408 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I3/672

[62]	TIM A M. Coalbed methane：A review[J]. International Journal of Coal Geology，2012，101：36-81.
[56]	LIU S Q，SANG S X，MA，J S，et al. Effects of supercritical CO2 on micropores in bituminous and anthracite coal[J]. Fuel，2019，242：96-108.
[9]	CHEN H D，WANG Z F，CHEN X E，et al. Increasing permeability of coal seams using the phase energy of liquid carbon dioxide[J]. Journal of CO2 Utilization，2017，19：112-119.
[11]	LU T K，WANG Z F，YANG H M，et al. Improvement of coal seam gas drainage by under-panel cross-strata stimulation using highly pressurized gas[J]. International Journal of Rock Mechanics and Mining Sciences，2015，77：300-312.
[14]	FU X H，QIN Y，ZHANG W H，et al. Fractal classification and natural classification of coal pore structure based on migration of coal bed methane[J]. Chinese Science Bulletin，2005，50：66-71.
[16]	李志强，刘勇，许彦鹏，等. 煤粒多尺度孔隙中瓦斯扩散机制及动扩散系数新模型[J]. 煤炭学报，2016，41(3)：633-643.(LI Zhiqiang，LIU Yong，XU Yanpeng，et al. Gas diffusion mechanism in multi-scale pores of coal particles and new diffusion model of dynamic diffusion coefficient[J]. Journal of China Coal Society，2016，41(3)：633-643.(in Chinese))
[23]	LIU X F，NIE B S，GUO K Y，et al. Permeability enhancement and porosity change of coal by liquid carbon dioxide phase change fracturing[J]. Engineering Geology，2021，287：106106.
[26]	刘长江，桑树勋，张琨，等. 压汞法研究煤孔隙的适用性与局限性探讨[J]. 实验室研究与探索，2019，38(3)：11-15.(LIU Changjiang，SANG Shuxun，ZHANG Kun，et al. Discussion on reliability and limitation of applying mercury porosimetry on coal structure[J]. Research and Exploration in Laboratory，2019，38(3)：11-15.(in Chinese))
[28]	DEBELAK K A，SCHRODT J T. Comparison of pore structure in Kentucky coals by mercury penetration and carbon dioxide adsorption[J]. Fuel，1979，58(10)：732-736.
[31]	刘彦伟，张帅，左伟芹，等. 典型软硬煤全孔径孔隙结构差异性研究[J]. 煤炭科学技术，2021，49(10)：98-106.(LIU Yanwei，ZAHNG Shuai，ZUO Weiqin，et al. Study on differences of pore structure of typical soft and hard coal[J]. Coal Science and Technology，2021，49(10)：98-106.(in Chinese))
[33]	聂百胜，马延崑，何学秋，等. 煤与瓦斯突出微观机制探索研究[J]. 中国矿业大学学报，2022，51(2)：207-220.(NIE Baisheng，MA Yankun，HE Xueqiu，et al. Micro-scale mechanism of coal and gas outburst：A preliminary study[J]. Journal of China University of Mining and Technology，2022，51(2)：207-220.(in Chinese))
[35]	SHANG Z，WANG H F，LI B，et al. Experimental investigation of BLEVE in liquid CO2 phase-transition blasting for enhanced coalbed methane recovery[J]. Fuel，2021，292(7)：120283.
[2]	ZHOU F B，XIA T Q，WANG X X，et al. Recent developments in coal mine methane extraction and utilization in China：A review[J]. Journal of Natural Gas Science and Engineering，2016，31：437-458.
[4]	付江伟，傅雪海，刘琦，等. 低渗高突煤层体系化瓦斯治理关键技术研究[J]. 中国安全科学学报，2018，28(7)：109-115.(FU Jiangwei，FU Xuehai，LIU Qi，et al. Research on key technologies for systematic control of gas in coal seam having low permeability and high outburst risk[J]. China Safety Science Journal，2018，28(7)：109-115.(in Chinese))
[6]	曹运兴，张军胜，田林，等. 低渗煤层定向多簇气相压裂瓦斯治理技术研究与实践[J]. 煤炭学报，2017，42(10)：2 631-2 641.(CAO Yunxing，ZHANG Junsheng，TIAN Lin，et al. Research and application of CO2 gas fracturing for gas control in low permeability coal seams[J]. Journal of China Coal Society，2017，42(10)：2 631-2 641.(in Chinese))
[7]	张东明，白鑫，尹光志，等. 低渗煤层液态CO2相变定向射孔致裂增透技术及应用[J]. 煤炭学报，2018，43(7)：1 938-1 950. (ZHANG Dongming，BAI Xin，YIN Guangzhi，et al. Research and application on technology of increased permeability by liquid CO2 phase change directional jet fracturing in low-permeability coal seam[J]. Journal of China Coal Society，2018，43(7)：1 938-1 950.(in Chinese))
[19]	CAO Y X，ZHANG J S，ZHAI H，et al. CO2 gas fracturing：A novel reservoir stimulation technology in low permeability gassy coal seams[J]. Fuel，2017，203：197-207.
[55]	YAO S P，JIAO K，ZHANG K，et al. An atomic force microscopy study of coal nanopore structure[J]. Chinese Science Bulletin，2011，56：2 706-2 712.
[67]	LIU S Q，MA J S，SANG S X，et al. The effects of supercritical CO2 on mesopore and macropore structure in bituminous and anthracite coal[J]. Fuel，2018，223：32-43.
[5]	王兆丰，孙小明，陆庭侃，等. 液态CO2相变致裂强化瓦斯预抽实验研究[J]. 河南理工大学学报：自然科学版，2015，34(1)：1-5.(WANG Zhaofeng，SUN Xiaoming，LU Tingkan，et al. Experiment research on strengthening gas drainage effect with fracturing technique by liquid CO2 phase transition[J]. Journal of Henan Polytechnic University：Natural Science，2015，34(1)：1-5.(in Chinese))
[17]	王刚，王世斌，李怀兴，等. 考虑煤体孔-裂隙介尺度特征的水相渗流演化模型研究[J]. 岩石力学与工程学报，2021，40(8)：1 547-1 558.(WANG Gang，WANG Shibin，LI Huaixing，et al Study on water phase seepage evolution model considering mesoscale characteristics of pore and fissure in coal[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(8)：1 547-1 558.(in Chinese))
[29]	LI Y B，SONG D Y，LIU S M，et al. Evaluation of pore properties in coal through compressibility correction based on mercury intrusion porosimetry：A practical approach[J]. Fuel，2021，291：120130.
[38]	BARDESTANI R，PATIENCE G S，KALIAGUINE S. Experimental methods in chemical engineering：specific surface area and pore size distribution measurements-BET，BJH，and DFT[J]. The Canadian Journal of Chemical Engineering，2019，97(11)：2 781-2 791.
[40]	许浩，张尚虎，冷雪，等. 沁水盆地煤储层孔隙系统模型与物性分析[J]. 科学通报，2005，(增1)：45-50.(XU Hao，ZHANG Shanghu，LENG Xue，et al. Pore system model and physical property analysis of coal reservoir in Qinshui Basin[J]. Chinese Science Bulletin，2005，(Supp.1)：45-50.(in Chinese))
[41]	陈萍，唐修义. 低温氮吸附法与煤中微孔隙特征的研究[J]. 煤炭学报，2001，26(5)：552-556.(CHEN Ping，TANG Xiuyi. The research on the adsorption of nitrogen in low temperature and micro-pore properties incoal[J]. Journal of China Coal Society，2001，26(5)：552-556.(in Chinese))
[43]	HOU X W，LIU S M，ZHU Y M，et al. Experimental and theoretical investigation on sorption kinetics and hysteresis of nitrogen，methane，and carbon dioxide in coals[J]. Fuel，2020，268：117349.
[45]	SHANG Z，WANG H F，LI B，et al. The effect of leakage characteristics of liquid CO2 phase transition on fracturing coal seam：Applications for enhancing coalbed methane recovery[J]. Fuel，2022，308：122044.
[47]	ZHANG Y N，DENG H W，KE B，et al. Research on the explosion effects and fracturing mechanism of liquid carbon dioxide blasting[J]. Mining，Metallurgy and Exploration，2022，39：521-530.
[21]	BAI X，ZHANG，D M，ZENG S，et al. An enhanced coalbed methane recovery technique based on CO2 phase transition jet coal-breaking behavior[J]. Fuel，2020，265：116912.
[71]	REN J G，SONG Z M，LI B，et al. Structure feature and evolution mechanism of pores in different metamorphism and deformation coals[J]. Fuel，2021，283：119292.
[3]	郭晓阳，邓存宝，凡永鹏，等. 煤层多分支水平井叶脉仿生瓦斯抽采实验研究[J]. 岩石力学与工程学报，2019，38(12)：2 418-2 427. (GUO Xiaoyang，DENG Cunbao，FAN Yongpeng，et al. Experimental study on leaf vein bionic gas drainage of multi-branch horizontal wells in coal seams[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(12)：2 418-2 427.(in Chinese))
[10]	CAO Y X，ZHANG J S，ZHANG X S，et al. Micro-fractures in coal induced by high pressure CO2 gas fracturing[J]. Fuel，2022，2022：12 148.
[12]	王海东. 突出煤层掘进工作面CO2可控相变致裂防突技术[J]. 煤炭科学技术，2016，44(3)：70-74.(WANG Haidong. CO2 controllable phase transition fracturing and outburst prevention technology of gateway driving face in outburst seam[J]. Coal Science and Technology，2016，44(3)：70-74.(in Chinese))
[22]	XIA B W，LIU X F，SONG D Z，et al. Evaluation of liquid CO2 phase change fracturing effect on coal using fractal theory[J]. Fuel，2021，287：119569.
[24]	LIAO Z W，LIU X F，SONG D Z，et al. Micro-structural damage to coal induced by liquid CO2 phase change fracturing[J]. Natural Resources Research，2020，30(2)：1 613-1 627.
[34]	蒋静宇，程远平，张硕. 低阶煤孔隙结构定量表征及瓦斯吸附放散特性[J]. 煤炭学报，2021，46(10)：3 221-3 233.(JIANG Jingyu，CHENG Yuanping，ZHANG Shuo. Quantitative characterization of pore structure and gas adsorption and diffusion properties of low-rank coal[J]. Journal of China Coal Society，2021，46(10)：3 221-3 233.(in Chinese))
[36]	ROOTARE H. M. A review of mercury porosimetry[M]. [S. l.]：Springer US，1970：225-252.
[46]	SHANG Z，WANG H F，LI B，et al. Fracture processes in coal measures strata under liquid CO2 phase transition blasting[J]. Engineering Fracture Mechanics，2021，254：107902.
[48]	陶明，赵华涛，李夕兵，等. 液态CO2相变致裂破岩与炸药破岩综合对比分析[J]. 爆破，2018，35(2)：41-49.(TAO Ming，ZHAO Huatao，LI Xibing，et al. Comprehensive comparative analysis of liquid CO2 Phase change fracturing and explosive rock fracturing[J]. Blasting，2018，35(2)：41-49.(in Chinese))
[72]	PAN J M，ZHAO Y Q，HOU Q L，et al. Nanoscale pores in coal related to coal rank and deformation structures[J]. Transport in Porous Media，2015，107：543-554.
[15]	马东民，马薇，蔺亚兵. 煤层气解吸滞后特征分析[J]. 煤炭学报，2012，37(11)：1 885-1 889.(MA Dongmin，MA Wei，LIN Yabing. Desorption hysteresis characteristics of CBM[J]. Journal of China Coal Society，2012，37(11)：1 885-1 889.(in Chinese))
[1]	袁亮. 瓦斯治理理念和煤与瓦斯共采技术[J]. 中国煤炭，2010，36(6)：5-12.(YUAN Liang. Concept of gas control and simultaneous extraction of coal and gas[J]. China Coal，2010，36(6)：5-12.(in Chinese))
[13]	CAI Y D，LIU D M，PAN Z J，et al. Investigating the effects of seepage-pores and fractures on coal permeability by fractal analysis[J]. Transport in Porous Media，2016，111(2)：479-497.
[25]	THOMME S M，KANEK O K，NEIMARK A V，et al. Physisorption of gases，with special reference to the evaluation of surface area and pore size distribution(IUPAC Technical Report)[J]. Pure and Applied Chemistry，2015，87(9/10)：1 051-1 069.
[37]	YANG Q L，XUE J H，LI W，et al. Comprehensive evaluation and interpretation of mercury intrusion porosimetry data of coals based on fractal theory，Tait equation and matrix compressibility[J]. Fuel，2021，298，120823.
[49]	黄楷，吴基文，翟晓荣，等. 不同煤体结构煤岩抗拉强度测试[J]. 工矿自动化，2021，47(7)：115-119.(HUANG Kai，WU Jiwen，ZHAI Xiaorong，et al. Tesnsile strength test of coal and rock with different coal structure[J]. Industry and Mine Automation，2021，47(7)：115-119.(in Chinese))
[58]	LU G W，WANG J L，WEI C T，et al. Pore fractal model applicability and fractal characteristics of seepage and adsorption pores in middle rank tectonic deformed coals from the Huaibei coal field[J]. Journal of Petroleum Science and Engineering，2018，171：808-817.
[60]	JI H J，LI Z H，YANG Y L，et al. Effects of Organic Micromolecules in coal on its Pore Structure and Gas Diffusion Characteristics[J]. Transport in Porous Media，2015，107：419-433.
[61]	AN F H，CHENG Y P，WU D W，et al. The effect of small micropores on methane adsorption of coals from Northern China[J]. Adsorption，2013，19：83-90.
[70]	SONG Y，JIANG B，LIU J G. Nanopore structural characteristics and their impact on methane adsorption and diffusion in low to medium tectonically deformed coals：case study in the Huaibei coal field[J]. Energy and Fuel，2017，31：6 711-6 723.
[8]	张东明，白鑫，尹光志，等. 低渗煤层液态CO2相变射孔破岩及裂隙扩展力学机制[J]. 煤炭学报，2018，43(11)：3 154-3 168. (ZHANG Dongming，BAI Xin，YIN Guangzhi，et al. Mechanism of breaking and fracture expansion of liquid CO2 phase change jet fracturing in low-permeability coal seam[J]. Journal of China Coal Society，2018，43(11)：3 154-3 168.(in Chinese))
[50]	孙可明，王金彧，辛利伟. 不同应力差条件下超临界CO2气爆煤岩体气楔作用次生裂纹扩展规律研究[J]. 应用力学学报，2019，36(2)：466-472.(SUN Keming，WANG Jinyu，XIN Liwei. Research on the law of secondary cracks propagation in coal and rock caused by gas wedging during supercritical CO2 explosion under different stress differences[J]. Chinese Journal of Applied Mechanics，2019，36(2)：466-472.(in Chinese))
[53]	李美芬，曾凡桂，齐福辉，等. 不同煤级煤的Raman谱特征及与XRD结构参数的关系[J]. 光谱学与光谱分析，2009，29(9)：2 446-2 449.(LI Meifen，ZENG Fangui，QI Fuhui，et al. Raman spectroscopic characteristics of different rank coals and the relation with XRD structural parameters[J]. Spectroscopy and Spectral Analysis，2009，29(9)：2 446-2 449.(in Chinese))
[57]	SONG D Y，JI X F，LI Y B，et al. Heterogeneous development of micropores in medium-high rank coal and its relationship with adsorption capacity[J]. International Journal of Coal Geology，2020，226：103497.
[59]	LIU H H，MOU J H，CHENG Y P. Impact of pore structure on gas adsorption and diffusion dynamics for long-flame coal[J]. Journal of Natural Gas Science and Engineering，2015，22：203-213.
[65]	WANG L，ZHANG G X，LIU J，et al. Effect of the pore structure on adsorption and diffusion migration of different rank coal samples[J]. Energy & Fuel，2020，34：12 486-12 504.
[69]	SONG Y，JIANG B，LI F L，et al. Structure and fractal characteristic of micro- and meso-pores in low，middle-rank tectonic deformed coals by CO2 and N2 adsorption[J]. Microporous and Mesoporous Materials，2017，253：191-202.
[18]	安丰华，贾宏福，刘军. 基于煤孔隙构成的瓦斯扩散模型研究[J]. 岩石力学与工程学报，2021，40(5)：987-996.(AN Fenghua，JIA Hongfu，LIU Jun. A gas diffusion model based on the pore structure in coal[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(5)：987-996.(in Chinese))
[27]	TODA Y，TOYODA S. Application of mercury porosimetry to coal[J]. Fuel，1972，51(3)：199-201.
[39]	MASTALERZ M，DROBNIAK A，RUPP J. Meso-and micropore characteristics of coal lithotypes：implications for CO2 adsorption[J]. Energy and Fuels，2008，22(6)：4 049-4 061.
[51]	周科平，柯波，李杰林，等. 液态CO2爆破系统压力动态响应及爆炸能量分析[J]. 爆破，2017，34(3)：7-13.(ZHOU Keping，KE Bo，LI Jielin，et al. Pressure dynamic response and explosion energy of liquid carbon dioxide blasting system[J]. Blasting，2017，34(3)：7-13.(in Chinese))
[63]	NIE B S，LIU X F，YUAN S F，et al. Sorption charateristics of methane among various rank coals：impact of moisture[J]. Adsorption，2016，22：315-325.
[20]	白鑫，张东明，王艳，等. 液态CO2相变射流压力变化及其煤岩致裂规律[J]. 中国矿业大学学报，2020，(4)：661-670.(BAI Xin，ZHANG Dongming，WANG Yan，et al. Pressure variation and coal fracturing law of liquid CO2 phase transition jet[J]. Journal of China University of Mining and Technology，2020，(4)：661-670.(in Chinese))
[32]	李阳，张玉贵，张浪，等. 基于压汞、低温N2吸附和CO2吸附的构造煤孔隙结构表征[J]. 煤炭学报，2019，44(4)：220-228.(LI Yang，ZHANG Yugui，ZHANG Lang，et al. Characterization on pore structure of tectonic coals based on m[J]. Journal of China Coal Society，2019，44(4)：220-228.(in Chinese))
[44]	ZHU J，ZHANG B，ZHANG Y，et al. Coal pore characterristics in different coal mine dynmic disasters[J]. Arabian Journal of Geosciences，2018，11(17)：1-10.
[68]	CHEN K，LIU X F，WANG L K，et al. Influence of sequestered supercritical CO2 treatment on the pore size distribution of coal across the rank range[J]. Fuel，2021，306：121708.
[30]	宋晓夏，王绍清，唐跃刚，等. 中梁山南矿构造煤吸附孔分形特征[J]. 煤炭学报，2013，38(1)：134-139.(SONG Xiaoxia，WANG Shaoqing，TANG Yuegang，et al. Fractal characteristics of adsorption pores of tectonic coal from Zhongliangshan southern coalmine[J]. Journal of China Coal Society，2013，38(1)：134-139.(in Chinese))
[42]	降文萍，宋孝忠，钟玲文. 基于低温液氮实验的不同煤体结构煤的孔隙特征及其对瓦斯突出影响[J]. 煤炭学报，2011，36(4)：609-614.(JAING Wenping，SONG Xiaozhong，ZHONG Lingwen. Research on the pore properties of different coal body structure coals and the effects on gas outburst based on the low-temperature nitrogen adsorption method[J]. Journal of China Coal Society，2011，36(4)：609-614.(in Chinese))
[54]	李霞，曾凡桂，王威，等. 低中煤级煤结构演化的XRD表征[J]. 燃料化学学报，2016，44(7)：777-783.(LI Xia，ZENG Fangui，WANG Wei，et al. XRD charadterization of structural evolution in low-middle rank coals[J]. Journal of Fuel Chemistry and Technology，2016，44(7)：777-783.(in Chinese))
[66]	NIE B S，LIU X F，YANG L L，et al. Pore structure characterization of different rank coals using gas adsorption and scanning electron microscopy[J]. Fuel，2015，158：908-917.
[52]	李小明，曹代勇，张守仁，等. 不同变质类型煤的XRD结构演化特征[J]. 煤田地质与勘探，2003，(3)：5-7.(LI Xiaoming CAO Daiyong，ZHANG Shouren，et al. Study of the XRD parameter evolution of coal of different metamorphism types[J]. Coal Geology and Exploration，2003，(3)：5-7.(in Chinese))
[64]	CROSDALE P J，BEAMISH B B，VALIX M. Coalbed methane sorption related to coal composition[J]. International Journal of Coal Geology，1998，35：147-158.