构造煤煤层气分压合排产气效果及影响因素分析
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摘要
针对平顶山矿区构造煤发育、瓦斯危害严重的现状,为探讨分压合排技术在平顶山矿区瓦斯地面抽采中的适用性,通过分析平顶山矿区首山一矿四2、二1煤层分压合排的产气效果和影响因素,探讨了四2、二1煤层分压合排产气效果不佳的原因。结果表明:首山一矿四2、二1煤层的储层压力及压力梯度、渗透率、煤层顶底板岩石特征和水文地质条件差别不大,对分压合排的效果影响不大;而较大的煤层间距、二1煤层相对较小的临界解吸压力和四2煤层松软的煤体结构,严重影响了分压合排的效果,造成产气效果不佳。因此,在现有技术条件下不适合对首山一矿四2、二1煤层采用分压合排技术。
According to the status of structural coal development and serious gas hazard in Pingdingshan Mining Area,in order to study the applicability of separate-layer pressure control and multi-layer drainage technology in the Shoushan No.1 Coal Mine of Pingdingshan Mining Area,the effect of gas production and influence factors of separate-layer pressure control and multi-layer drainage for No.4-2 and No.2-1 coal seam have been analyzed,and the reason of poor gas production of separate-layer pressure control and multi-layer drainage for No.4-2 and No.2-1 coal seams is discussed. The result indicates that the pressure,pressure gradient,permeability,properties of the roof with backplane and hydrogeological conditions are similar,and this has not influenced the multi-layer draining effect; the larger coal seam spacing,the smaller critical desorption pressure of No.2-1 coal seams and the soft structure of No.4-2 coal seams have seriously influenced on the multi-layer draining effect and cause poor gas production. So the technology of separate-layer pressure control and multi-layer drainage is not suitable for No.4-2 and No.2-1 coal seams of Shoushan No.1 Coal Mine.
According to the status of structural coal development and serious gas hazard in Pingdingshan Mining Area,in order to study the applicability of separate-layer pressure control and multi-layer drainage technology in the Shoushan No.1 Coal Mine of Pingdingshan Mining Area,the effect of gas production and influence factors of separate-layer pressure control and multi-layer drainage for No.4-2 and No.2-1 coal seam have been analyzed,and the reason of poor gas production of separate-layer pressure control and multi-layer drainage for No.4-2 and No.2-1 coal seams is discussed. The result indicates that the pressure,pressure gradient,permeability,properties of the roof with backplane and hydrogeological conditions are similar,and this has not influenced the multi-layer draining effect; the larger coal seam spacing,the smaller critical desorption pressure of No.2-1 coal seams and the soft structure of No.4-2 coal seams have seriously influenced on the multi-layer draining effect and cause poor gas production. So the technology of separate-layer pressure control and multi-layer drainage is not suitable for No.4-2 and No.2-1 coal seams of Shoushan No.1 Coal Mine.
引文
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[18]邵长金,邢立坤,李相方,等.煤层气藏多层合采的影响因素分析[J].中国煤层气,2012,9(3):8-12.SHAO Changjin,XING Likun,LI Xiangfang,et al.Analysis of factors influencing gas production of multi-seam drainage in CBM reservoir[J].Journal of China Coalbed Methane,2012,9(3):8-12.
[2]乔伟.软、硬煤结构特征与吸附特性研究[J].煤炭科学技术,2017,45(11):133-137.QIAO Wei. Study on structure characteristics and adsorption features of soft and hard coal[J]. Journal of Coal Science and Technology,2017,45(11):133-137.
[3]闫江伟,张玉柱,王蔚.平顶山矿区瓦斯赋存的构造逐级控制特征[J].煤田地质与勘探,2015,43(2):18-23.YAN Jiangwei,ZHANG Yuzhu,WANG Wei.Characteristics of gas occurrence under stepwise tectonic control in Pingdingshan mining area[J]. Journal of Coal Geology&Exploration,2015,43(2):18-23.
[4]姚艳斌,刘大锰,汤达祯,等.平顶山煤田煤储层物性特征与煤层气有利区预测[J].地球科学-中国地质大学学报,2007,32(2):285-290.YAO Yanbin,LIU Dameng,TANG Dazhen,et al. Coal reservoir physical characteristics and prospective areas for CBM exploitation in Pingdingshan coalfield[J]. Earth Science-Journal of China University of Geosciences,2007,32(2):285-290.
[5]倪小明,苏现波,李广生.樊庄地区3#和15#煤层合层排采的可行性研究[J].天然气地球科学,2010,21(1):144-149.NI Xiaoming,SU Xianbo,LI Guangsheng. Feasibility of multilayer drainage for No.3 and No.15 coal seams in the Fanzhuang Area[J].Journal of Natural Gas Geoscience,2010,21(1):144-149.
[6]谢学恒,李小龙,陈贞龙,等.延川南地区2号和10号煤层分压合采的可行性研究[J].油气藏评价与开发,2011,1(3):65-69.XIE Xueheng,LI Xiaolong,CHEN Zhenlong,et al.Research on the feasibility of layered fracture and commingled water drainage&gas production for No. 2 and No. 10 coal seams in Yanchuannan Area[J]. Journal of Reservoir Evaluation and Development,2011,1(3):65-69.
[7]熊涛,孙国忠,池斌,等.鄂尔多斯盆地东缘桑峨区煤层气分压合采可行性分析[J].中国煤炭地质,2013,25(12):52-54.XIONG Tao,SUN Guozhong,CHI Bin,et al. Feasibility study of separate layer fracturing and multi-layer drainage for CBM in sange area,eastern margin of ordos basin[J].Journal of Coal Geology of China,2013,25(12):52-54.
[8]王振云,唐书恒,孙鹏杰,等.沁水盆地寿阳区块3号和9号煤层合层排采的可行性研究[J].中国煤炭地质,2013,25(11):21-26.WANG Zhenyun,TANG Shuheng,SUN Pengjie,et al. Feasibility study of multi-layer drainage for No. 3 and No. 9 coal seams in Shouyang Block,Qinshui Basin[J]. Coal Geology of China,2013,25(11):21-26.
[9]孟艳军,汤达祯,许浩,等.煤层气开发中的层间矛盾问题:以柳林地区为例[J].煤田地质与勘探,2013,41(3):29-33.MENG Yanjun,TANG Dazhen,XU Hao,et al.Interlayer contradiction problem in coalbed methane development:a case study in Liulin Area[J]. Journal of Coal Geology and Exploration,2013,41(3):29-33.
[10]吕玉民,汤达祯,许浩,等.韩城煤层气田气井合采产能特征及其影响因素探析[M].北京:地质出版社,2013:169-177.
[11]黄华州,桑树勋,苗耀,等.煤层气井合层排采控制方法[J].煤炭学报,2014,39(S2):422-431.HUANG Huazhou,SANG Shuxun,MIAO Yao,et al. Drainage control of single vertical well with multi-hydraulic fracturing layers for coalbed methane development[J].Journal of China Coal Society,2014,39(S2):422-431.
[12]黄华州,桑树勋,宋化发,等.多压裂层煤层气井合层排采工艺控制指标体系研究[M].北京:地质出版社,2013:411-419.
[13]张振平,张明杰,杨坤,等.平顶山矿区首山一矿戊组煤高瓦斯压力成因[J].中国煤炭地质,2017,29(3):15-20.ZHANG Zhenping,ZHANG Mingjie,YANG Kun,et al. High gas pressure genesis in coal group wu,Shoushan No. 1 coal mine,Pingdingshan Mining Area[J]. Journal of China Coal Geology,2017,29(3):15-20.
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[15]汪万红.松软煤层含气量研究:以平顶山矿区首山一矿为例[J].中国煤层气,2013,10(5):17-19.WANG Wanhong.Research on the gas content of soft coal bed:a case study of the Shoushan No. 1 coal mine in the Pingdingshan Area[J]. Journal of China Coalbed Methane,2013,10(5):17-19.
[16]王占磊,吴财芳,李勃.平顶山矿区影响煤层气含气量的地质因素研究[J].地质学报,2010,30(2):191-193.WANG Zhanlei,WU Caifang,LI Bo.Geological factor effective on gas content of coal bed gas in the Pingdingshan Coal Mine[J].Journal of Geology,2010,30(2):191-193.
[17]汪万红,郑玉柱.煤层气分压合排技术适应条件分析:以陕西吴堡矿区为例[J].煤田地质与勘探,2014,42(4):36-38.WANG Wanhong, ZHENG Yuzhu. Analysis of adaptation conditions for CBM separate layer fracturing and multi-layer drainage technologies:a case study of Wubu mining area[J].Journal of Coal Geology&Exploration,2014,42(4):36-38.
[18]邵长金,邢立坤,李相方,等.煤层气藏多层合采的影响因素分析[J].中国煤层气,2012,9(3):8-12.SHAO Changjin,XING Likun,LI Xiangfang,et al.Analysis of factors influencing gas production of multi-seam drainage in CBM reservoir[J].Journal of China Coalbed Methane,2012,9(3):8-12.