煤层抽采钻孔用高性能微泡沫钻孔冲洗液研制  

Study on high-performance micro foam drilling flushing fluid for coal seam extraction drilling

作　　者：张学博[1,2,3] 屈朕 王攀 潘荣锟 ZHANG Xuebo;QU Zhen;WANG Pan;PAN Rongkun(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454003,China;Henan Province Gas Geology and Gas Control Key Laboratory,Jiaozuo Henan 454003,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Henan Polytechnic University,Jiaozuo Henan 454003,China)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南省瓦斯地质与瓦斯治理重点实验室,河南焦作454003 [3]河南理工大学煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454003

出　　处：《矿业科学学报》2025年第2期292-304,共13页Journal of Mining Science and Technology

基　　金：国家自然科学基金(52274186,52274187);河南省高校科技创新团队(24IRTSTHN018)。

摘　　要：针对传统的清水和无水冲洗液易导致钻孔变形和坍塌的问题,通过优选发泡剂、稳泡剂、膨润土和降滤失剂,构建一种微泡沫钻孔冲洗液体系,并通过室内模拟实验建立松软煤层相似材料模型,开展抽采钻孔模拟实验,分析微泡沫钻孔冲洗液的护孔效果。研究表明:①微泡沫钻孔冲洗液体系黏度适中,流变性能良好,动塑比高,滤失量小,密度为0.38 g/cm^(3),半衰期超过90 h,具有较厚的水化膜,稳定性强,粒径大小呈现正态分布,平均粒径为158μm;②微泡沫钻孔冲洗液携岩能力约为清水的67倍;③煤层岩样在微泡沫钻孔冲洗液中的膨胀量为0.2 mm,滚动回收率为96.4%,表明微泡沫钻孔冲洗液具有良好的抑制性能,能够维持瓦斯抽采钻孔的孔壁稳定性;④微泡沫钻孔冲洗液抗温性能良好,护孔效果好,能够有效阻止水分渗入煤层,防止抽采钻孔孔壁失稳坍塌。In order to solve the problem that the traditional clean water and anhydrous flushing fluid are easy to cause borehole deformation and collapse,a microfoam borehole rinsing fluid system was constructed by optimizing the foaming agent,foam stabilizer,bentonite and filtration loss reducing agent,and the similar material model of the soft coal seam was established through indoor simulation experiments,and the simulation experiment of the extraction borehole was carried out to analyze the hole protection effect of the microfoam borehole flushing fluid.The results show that:①The microfoam drilling and rinsing fluid system has moderate viscosity,good rheological properties,high dynamic plastic ratio,small filtration loss,density of 0.38 g/cm^(3),and half-life of over 90 h,It has a thick hydration film,strong stability,and a normal distribution of particle size,with an average particle size of 158μm.②The rock-carrying capacity of microfoam drilling flushing fluid is about 67 times that of clean water.③The expansion of the coal seam rock sample in the microfoam borehole flushing fluid was 0.2 mm,and the rolling recovery rate was 96.4%,indicating that the microfoam borehole flushing fluid had good inhibition performance and could maintain the stability of the hole wall of the gas extraction bore-hole.④The microfoam borehole flushing fluid has good temperature resistance and good hole protection effect,which can effectively prevent water from seeping into the coal seam and prevent the instability and collapse of the hole wall of the extraction borehole.

关 键 词：钻孔瓦斯抽采 微泡沫钻孔冲洗液 性能评价 护孔效果 

分 类 号：TD712[矿业工程—矿井通风与安全]