两性离子表面活性剂对煤层注水渗流润湿协同效应的研究  

Influence of zwitterionic surfactant on wetting effect of coal seam water injection

作　　者：申家龙 薄福利 SHEN Jialong;BO Fuli(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Jining Energy Development Group Ltd.,Jining 272000,China)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590 [2]济宁能源发展集团,山东济宁272000

出　　处：《煤矿安全》2024年第5期100-106,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52074171)。

摘　　要：煤层注水技术是防治冲击地压、粉尘以及火灾等众多矿井灾害的重要手段之一,煤层注水过程可以概括成渗流阶段、渗流与润湿协同阶段以及润湿阶段。针对煤层注水渗流阶段,利用三轴渗流实验装置,以达西定律为理论基础,研究了不同表面活性剂溶液(十二烷基硫酸钠和复合型表面活性剂)表面张力及其对裂隙煤体渗流特性的变化规律,对比分析了不同表面活性剂溶液在煤体中渗透系数的变化特征,探讨了复合型表面活性剂对破裂煤体注水的影响规律以及不同表面活性剂对裂隙煤体的润湿协同效应。实验结果表明:十二烷基硫酸钠能够降低液体表面张力,将渗流系数从3.73×10^(-4)提高到5.6×10^(-4),能够有效地促进煤层注水润湿效果;十二烷基硫酸钠与煤体之间的吸附性,增大了渗流溶液在煤体裂隙表面的张力,降低了煤体的注水润湿效果,最终阻碍了渗流润湿过程;通过加入其他原料配置的非离子-阴离子复合表面活性剂能够有效减小吸附性,并有效增强渗流效果,明显提高注水渗流润湿效率,验证了两性离子表面活性剂对煤层注水具有显著的协同效应。Coal seam water injection technology is one of the important means to prevent and control many mine disasters such as rock burst,dust and fire.The process of coal seam water injection can be summarized into seepage stage,seepage and wetting coordination stage and wetting stage.According to the seepage stage of coal seam water injection,using the triaxial seepage experiment device,based on Darcy’s Law,the surface tension of different surfactant solutions(sodium dodecy sulfate and composite surfactants)and its influence on seepage characteristics of fractured coal are studied in this paper.The variation characteristics of permeability coefficient of different surfactant solutions in coal are compared and analyzed,and the influence of compound surfactant on water injection of fractured coal and the wetting synergistic effect of different surfactants on fractured coal are discussed.The experimental results of thesodium dodecyl sulfate can reduce the liquid surface tension,increase the seepage coefficient from 3.73×10^(-4) to 5.6×10^(-4),and promote the effect of coal seam water injection wetting.The adsorption between sodium dodecyl sulfate and the coal body increases the tension of the seepage solution on the surface of the coal body crack,decreases the effect of water injection wetting,and finally hinders the seepage wetting process.By adding other raw materials to configure a new composite surfactant,it can effectively reduce the adsorption,enhance the seepage effect and improve the water injection efficiency.The conclusions obtained can provide reference for raw material optimization and parameter setting of on-site coal seam water injection,and provide new ideas for the research of coal seam water injection technology.

关 键 词：煤层注水 复合型表面活性剂 渗流系数 协同效应 润湿效能 

分 类 号：TD713[矿业工程—矿井通风与安全]