摘要
为研究H2S水溶液对低阶煤渗透性的影响,选取准东煤田五彩湾煤矿(WCW)和吐哈煤田沙尔湖煤矿(SEH)的低阶煤样品,开展了H2S水溶液酸化前后平行层理方向和垂直层理方向煤样的孔隙度和渗透率测试、核磁共振测试及扫描电镜观测等对比实验。研究结果表明:H2S水溶液能够与孔、裂隙中的矿物发生溶蚀反应,导致酸化后煤的孔隙度增加、孔径分布变化及孔、裂隙连通性增强,且孔、裂隙中的煤粉和黏土矿物等物质能够通过裂隙随酸液运移出去,从而导致煤的渗透性得到改善;初始孔隙度越大,裂隙越发育,孔、裂隙连通性越好,渗透性越强的煤样H2S水溶液酸化后的扩容、增渗效果越明显。
In order to study the effect of H2S solution to the permeability of low-rank coal, we select low-rank coal sample from Wucaiwan Coal Mine(WCW) of eastern Junggar Basin coalfield and Shaerhu Coal Mine(SEH) of Tuha coalfield. The porosity and permeability at the parallel and vertical stratifications were compared before and after the acidizing experiments using various methods including the tests of porosity and permeability, Nuclear magnetic resonance(NMR) and scanning electron microscopy(SEM). The results show that H2S solution can react with the minerals in pores and fractures, lead to the increase of porosity, the change of pore size distribution, the enhancement of connectivity between pores and fractures. At the same time, some materials such as coal powder and clay minerals transport out through fractures with H2S solution, resulting in improving the permeability of coal. The larger initial porosity, the more fractures developed, the better connectivity between pore and fracture, and the better permeability, the effective of H2S solution to expansion and permeability is more obvious after acidification.
作者
曹玉召
郝慧丽
王海超
加那提·叶尔肯
吾木尔江·达吾列提
CAO Yuzhao;HAO Huili;WANG Haichao;Jianati Yeerken;Wumuerjiang Dawulieti(Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of Centred Asian Orogenic Belt,Xinjiang University,Urumqi 830047,China;School of Geological and Mining Engineering,Xinjiang University,Urumqi 830047,China;College of Mathematics and System Science,Xinjiang University,Uruniqi 830047,China)
出处
《煤矿安全》
CAS
北大核心
2021年第9期29-35,共7页
Safety in Coal Mines
基金
国家自然科学基金资助项目(41902171)
新疆维吾尔自治区高校科研计划资助项目(XJEDU2018Y014)
国家大学生创新训练资助项目(201910755001)。
关键词
煤层气
低阶煤
渗透性
核磁共振
H2S水溶液
coal bed methane(CBM)
low-rank coal
permeability
nuclear magnetic resonance(NMR)
H2S aqueous solution
