非常规天然气

杨柳煤矿割缝预抽后煤体孔隙结构变化特征

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  • 中国矿业大学安全工程学院,煤炭资源与安全开采国家重点实验室,江苏 徐州 221116
刘厅(1990-),男,江苏连云港人,博士研究生,主要从事矿井瓦斯防治研究. E-mail:mtkcliuting2013@163.com.

收稿日期: 2014-12-09

  修回日期: 2015-01-20

  网络出版日期: 2015-10-10

基金资助

国家重点基础研究发展计划(编号:2011CB20120);国家自然科学基金项目(编号:51474211);“十二五”国家科技支撑计划(编号:2012BAK04B07)联合资助.

Pore Characteristics of Coal with the Treatment of Hydraulic Slotting and Gas Pre-drainage in Yangliu Coal Mine

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  • School of Safety Engineering,State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology,Xuzhou 221116,China

Received date: 2014-12-09

  Revised date: 2015-01-20

  Online published: 2015-10-10

摘要

为了系统分析割缝预抽后钻孔周围煤体孔隙结构变化特征,基于孔隙结构测试方法的敏感性和精确性及液氮吸附法和压汞法测定原理,提出将液氮吸附法和压汞法有机结合来表征煤体孔隙结构。结果表明:①二者的有机结合应满足填充临界孔径所需的实验介质体积相等且结合点平滑过渡;②随取样点与割缝孔距离的减小,小孔(10~100nm)所占比例显著降低,大孔(>1 000nm)所占比例逐渐提高,中孔(100~1 000nm)和微孔(<10nm)所占比例变化较小;③割缝预抽后煤体瓦斯放散初速度ΔP受取样点与割缝孔距离的影响。水力割缝与瓦斯抽采协同作用能够弱化煤体对瓦斯的吸附能力并显著提高瓦斯在煤体中的渗流能力。研究结果对于指导高压水射流割缝瓦斯预抽具有重要意义。

本文引用格式

刘厅,林柏泉,邹全乐,朱传杰,孔佳,郭畅 . 杨柳煤矿割缝预抽后煤体孔隙结构变化特征[J]. 天然气地球科学, 2015 , 26(10) : 1999 -2008 . DOI: 10.11764/j.issn.1672-1926.2015.10.1999

Abstract

To analyze the change of pore characteristics of coal around the borehole after hydraulic slotting and gas pre-drainage systematically,considering the sensitivity,precision and the test principles of Nitrogen Gas Adsorption(N2GA) and Mercury Intrusion Porosimetry(MIP),a method,combining the two means organically,was put forward to characterize the pore structure.The results show that the combination condition is that the volume of the testing mediums filling the critical pore should be equal and the bonding point transits smoothly.With the decrease of the distance between sampling point and the slotted borehole,the proportion of the minipore(10-100nm) decreases remarkably,the macropore(>1 000nm) increases gradually,the mesopore(100-1 000nm) and micropore(<10nm) show little changes.The initial gas emission characteristic of the coal sample varies with the distance.The combined action of hydraulic slotting and gas pre-drainage can weaken the adsorptivity and strengthen the seepage capacity of the coal mass remarkably.The research results are of great significance to the gas pre-drainage after hydraulic slotting.

参考文献

[1]Lin Baiquan,Zou Quanle,Shen Chunming,et al.Investigation on highly effective depressurization property of dual-power drilling and its application[J].Journal of China Coal Society,2013,38(6):911-917.[林柏泉,邹全乐,沈春明,等.双动力协同钻进高效卸压特性研究及应用[J].煤炭学报,2013,38(6):911-917.]
[2]Lin Baiquan,Liu Ting,Zou Quanle,et al.Crack propagation patterns and energy evolution rules of coal within slotting disturbed zone under various lateral pressure coefficients[J].Arabian Journal of Geosciences,2015,8(9):6643-6654.
[3]Lu Yiyu,Liu Yong,Li Xiaohong,et al.A new method of drilling long boreholes in low permeability coal by improving its permeability[J].International Journal of Coal Geology,2010,84(2):94-102.
[4]Tang Jupeng,Yang Senlin,Li Liping.Numerical simulation of effects of different hydraulic cutting arrangement on pressure relief and gas outburst prevention[J].The Chinese Journal of Geological Hazard and Control,2012,23(1):61-66.[唐巨鹏,杨森林,李利萍.不同水力割缝布置方式对卸压防突效果影响数值模拟[J].中国地质灾害与防治学报,2012,23(1):61-66.]
[5]Lin Baiquan,Meng Fanwei,Zhang Haibin.Regional gas control based on drilling-slotting-extracting integration technology[J].Journal of China Coal Society,2011,36(1):75-79.[林柏泉,孟凡伟,张海宾.基于区域瓦斯治理的钻割抽一体化技术及应用[J].煤炭学报,2011,36(1):75-79.]
[6]Lu Yiyu,Liu Yong,Xia Binwei,et al.The novel technology of drilling arrangement of rock cross-cut coal uncovering basing on theoretical analysis[J].Journal of China Coal Society,2011,36(2):283-287.[卢义玉,刘勇,夏彬伟,等.石门揭煤钻孔布置优化分析及应用[J].煤炭学报,2011,36(2):283-287.]
[7]Lu Yiyu,Jia Yajie,Ge Zhaolong,et al.Coupled fluid-solid model of coal bed methane and its application after slotting by high-pressure water-jet[J].Journal of China University of Mining & Technology,2014,43(1):23-29.[卢义玉,贾亚杰,葛兆龙,等.割缝后煤层瓦斯的流—固耦合模型及应用[J].中国矿业大学学报,2014,43(1):23-29.]
[8]Li Xiaohong,Lu Yiyu,Zhao Yu,et al.Study on improving the permeability of soft coal seam with high pressure pulsed water jet[J].Journal of China Coal Society,2008,33(12):1386-1390.[李晓红,卢义玉,赵瑜,等.高压脉冲水射流提高松软煤层透气性的研究[J].煤炭学报,2008,33(12):1386-1390.]
[9]Duan Kanglian,Feng Zengchao,Zhao Yangsheng,et al.Testing study of methane drainage by bore and hydraulic-cutting seam from low permeability coal seam[J].Journal of China Coal Society,2002,27(1):50-53.[段康廉,冯增朝,赵阳升,等.低渗透煤层钻孔与水力割缝瓦斯排放的试验研究[J].煤炭学报,2002,27(1):50-53.]
[10]Feng Zengchao,Zhao Yangsheng,Yang Dong,et al.Testing study of outsized coal samples cutting and drilling to discharge coal- bed gas[J].Natural Gas Industry,2005,25(3):127-129.[冯增朝,赵阳升,杨栋,等.割缝与钻孔排放煤层气的大试样试验研究[J].天然气工业,2005,25(3):127-129.]
[11]Jiang 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.[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的影响[J].煤炭学报,2011,36(4):609-614.]
[12]Xue Guangwu,Liu Hongfu,Li Wei.Deformed coal types and pore characteristics in Hancheng coalmines in Eastern Weibei coalfields[J].International Journal of Mining Science and Technology,2012,22(5):681-686.
[13]Zhang Rui,Ning Zhengfu,Yang Feng,et al.Experimental study on microscopic pore structure controls on shales permeability under compaction process[J].Natural Gas Geoscience,2014,25(8):1284-1289.[张睿,宁正福,杨峰,等.微观孔隙结构对页岩应力敏感影响的实验研究[J].天然气地球科学,2014,25(8):1284-1289.]
[14]Chen Xiangjun,Liu Jun,Wang Lin,et al.Influence of pore size distribution of different metamorphic grade of coal on adsorption constant[J].Journal of China Coal Society,2013,38(2):294-300.[陈向军,刘军,王林,等.不同变质程度煤的孔径分布及其对吸附常数的影响[J].煤炭学报,2013,38(2):294-300.]
[15]Bi He,Jiang Zhenxue,Li Peng,et al.Adsorption characteristic and influence factors of Longmaxi shale in southeastern Chongqing[J].Natural Gas Geoscience,2014,25(2):302-310.[毕赫,姜振学,李鹏,等.渝东南地区龙马溪组页岩吸附特征及其影响因素[J].天然气地球科学,2014,25(2):302-310.]
[16]Yao Yanbin,Liu Dameng,Tang Dazhen,et al.Fractal characterization of seepage-pore of coals from China:An investigation on permeability of coals[J].Computers & Geosciences,2009,35(6):1159-1166.
[17]Yang Song,Chi Shengping,Qin Yong,et al.Experimental study on acidization alteration of coal reservoir in the southern Yanchuan,Ordos Basin[J].Natural Gas Geosciences,2014,25(5):761-766.[杨松,池圣平,秦勇,等.鄂尔多斯盆地延川南区块煤储层酸化改造试验研究[J].天然气地球科学,2014,25(5):761-766.]
[18]Cai Yidong,Liu Dameng,Pan Zhejun,et al.Pore structure and its impact on CH4 adsorption capacity and flow capability of bituminous and subbituminous coals from Northeast China[J].Fuel,2013,103:258-268.
[19]Mayka Schmitt,Celso P Fernandes,Jose A B daCunha Neto,et al.Characterization of pore system in seal rocks using nitrogen gas adsorption combined with mercury injection capillary pressure techniques[J].Marine and Petroleum Geology,2013,39(1):138-149.
[20]Josef Kaufmann.Pore space analysis of cement-based materials by combined Nitrogen sorption-Wood′s metal impregnation and multi-cycle mercury intrusion[J].Cement & Concrete Composites,2010,32(7):514-522.
[21]Iain Hitchcock,Marie Lunel,Serafim Bakalis,et al.Improving sensitivity and accuracy of pore structural characterization using scanning curves in integrated gas sorption and mercury porosimetry experiments[J].Journal of Colloid and Interface Science,2014,417:88-99.
[22]Kaufmann Josef.Pore space analysis of cement-based materials by combined Nitrogen sorption-Wood′s metal impregnation and multi-cycle mercury intrusion[J].Cement and Concrete Composites,2010,32(7):514-522.
[23]Yao Yanbin,Liu Dameng.Comparison of low-field NMR and mercury intrusion porosimetry in characterizing pore size distributions of coals[J].Fuel,2012,95:152-158.
[24][JP2]Sidney Diamond.Mercury porosimetry:An inappropriate methodfor the measurement of pore size distributions in cement-based materials[J].Cement and Concrete Research,2000,10(30):1517-1525.
[25]Kate J M,Gokhale C S.A simple method to estimate complete pore size distribution of rock[J].Engineering Geology,2006,84(1/2):48-69.
[26]Rouquerol J,Avnir D,Fairbridge C W,et al.Physical chemistry division commission on colloid and surface chemistry,subcommittee on characterization of porous solids:Recommendations for the characterization of porous solids[J].Pure and Applied Chemistry,1994,66(8):1739-1758.
[27]Ross D J K,Bustin R M.The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J].Marine and Petroleum Geology,2009,26(6):916-927.
[28]Tian Hua,Zhang Shuichang,Liu Shaobo,et al.Determination of organic-rich shale pore features by mercury injection and gas adsorption methods[J].Acta Petrolel Sinica,2012,33(3):419-427.[田华,张水昌,柳少波,等.压汞法和气体吸附法研究富有机质页岩孔隙特征[J].石油学报,2012,33(3):419-427.]
[29]Zhou Longgang,Wu Caifang.Pore characteristics of the main coal seams in Bide-Santang Basin in Western Guizhou province[J].Journal of China Coal Society,2012,37(11):1878-1884.[周龙刚,吴财芳.黔西比德—三塘盆地主采煤层孔隙特征[J].煤炭学报,2012,37(11):1878-1884.]
[30]Chen Xiangjun,Cheng Yuanping,Wang Lin.Moisture content affected to initial gas emission velocity of different ranking coal[J].Coal Science and Technology,2012,40(12):62-65.[陈向军,程远平,王林.水分对不同煤阶煤瓦斯放散初速度的影响[J].煤炭科学技术,2012,40(12):62-65.]
[31]Li Chengwu,Lei Dongji.Experimental research of the influence of static electric field on the characteristics of coal gas emission[J].Journal of China Coal Society,2012,37(6):962-966.[李成武,雷东记.静电场对放散瓦斯特性影响的试验研究[J].煤炭学报,2012,37(6):962-966.]
[32]Lu Yiyu,You Yi,Liu Yong.Indexes optimization of outburst forecast while a rock cross-cut coal is uncovered by pulsed water jet[J].Journal of Chongqing University,2013,36(6):65-69.[卢义玉,尤祎,刘勇.脉冲水射流割缝后石门揭煤突出预测指标优选[J].重庆大学学报,2013,36(6):65-69.]
[33]Xia Tongqiang,Zhou Fubao,Liu Jishan,et al.Evaluation of the pre-drained coal seam gas quality[J].Fuel,2014,130:296-305.
[34]Chen Qiang,Kang Yili,You Lijun,et al.Micro-pore structure of gas shale and its effect on gas mass transfer[J].Natural Gas Geoscience,2013,24(6):1298-1304.[陈强,康毅力,游利军,等.页岩微孔结构及其对气体传质方式影响[J].天然气地球科学,2013,24(6):1298-1304.]

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