摘要
根据山西高河能源有限公司瓦斯预抽钻孔抽采数据显示,水力造穴钻孔单孔平均抽采纯量约为普通钻孔的3倍,而水力造穴钻孔单孔平均抽采浓度均低于普通钻孔。为了改善含水钻孔存在的高纯量低浓度瓦斯抽采现状,通过实验对比了环保型相变凝胶(EPCG)材料与普通水泥材料在浆液粘度、溶胀性、析水性以及保水性的浆液特性,分析了浆液对含水钻孔密封性的影响,并通过现场试验进行验证。研究结果表明,EPCG材料的注浆粘度为20~40 mPa·s,且在97 min达到终凝状态,在注浆过程及注浆完成后,浆液凝固过程对钻孔密封性的影响较小;水泥材料注浆粘度约为1000 mPa·s,在6 h后达到凝固状态,在注浆后凝固时间较长对钻孔密封性影响较大。在应对含水钻孔时,EPCG材料的溶胀性可以将外侵水转化为凝胶材料,并提高裂隙的封堵质量;而水泥材料受外侵水的影响会增加材料的析水率,影响材料的密封性能。EPCG具有良好的保水性,可以有效缓解外侵水的蒸发速率,在长期的抽采过程中可以降低抽采浓度的衰减速率;水泥材料凝固后,材料与水明显分离,不具备延缓水分蒸发的效果。通过现场测试,验证了EPCG材料封孔的含水钻孔比水泥材料封孔的含水钻孔拥有更高的浓度以及更低的衰减速率。
According to gas drainage data from pre-drainage boreholes at Shanxi Gaohe Energy Co.,Ltd.,the average pure gas drainage volume per hydraulic cavity-creating borehole is approximately three times that of conventional boreholes,while the average gas drainage concentration per hydraulic cavity-creating borehole is consistently lower than that of conventional boreholes.In order to improve the current situation of high purity and low concentration gas drainage in water-bearing boreholes,the slurry characteristics of environmentally friendly phase change gel(EPCG)material and ordinary cement material in slurry viscosity,swelling,water separation and water retention were compared through experiments.The influence of slurry on the sealing of water-bearing boreholes was analyzed and verified by field experiments.The results show that when the grouting viscosity of EPCG material is 20-40 mPa·s,it reaches the final solidification state in 97 min.The grouting process and the slurry solidification process after grouting have little effect on the sealing of boreholes.When the grouting viscosity of cement material is about 1000 mPa·s,is reaches the solidification state after 6 h.The long solidification time after grouting has a great influence on the sealing of borehole.When dealing with water-bearing boreholes,the swelling property of EPCG material can transform external water into gel material and improve the sealing quality of fractures.The cement material is affected by the external water invasion,which will increase the water separation rate of the material and affect the sealing performance of the material.EPCG has good water retention,which can effectively alleviate the evaporation rate of external water invasion,and can reduce the decay rate of drainage concentration in the long-term drainage process.After the cement material is solidified,the material and water are obviously separated,which does not have the effect of delaying water evaporation.Through field test,it is verified that the water-bearing borehole sealed by EPCG material has higher concentration and lower decay rate than the water-bearing borehole sealed by cement material.
作者
段琳珂
郝晋伟
霍中刚
韩鑫涛
底鹏举
杨伟东
李欣
DUAN Linke;HAO Jinwei;HUO Zhonggang;HAN Xintao;DI Pengju;YANG Weidong;LI Xin(Chinese Institute of Coal Science,Chaoyang,Beijing 100013,China;CCTEG China Coal Research Institute,Chaoyang,Beijing 100013,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Chaoyang,Beijing 100013,China;Beijing Engineering and Research Center of Mine Safe,Chaoyang,Beijing 100013,China)
出处
《中国煤炭》
2025年第6期82-92,共11页
China Coal
基金
煤炭科学技术研究院有限公司科技发展基金项目“抽采钻孔密封参数测定与质量评价技术及装备研发”(2024ZDI-07)。
关键词
凝胶材料
浆液特性
含水钻孔密封性
衰减速率
gel material
slurry characteristics
water-bearing borehole sealing
decay rate
作者简介
段琳珂(1999-),男,山西运城人,硕士研究生,主要从事瓦斯灾害防治的研究工作。E-mail:moqi1085257365@163.com。
