用于煤层解堵的缓冲土酸浓度配比实验优选  

Experimental optimization of concentration ratio of buffering acid used for removing plugging of coal seam

作　　者：薛磊 朱建国 郭朝锋 倪小明[2] 李阳 曹运兴 XUE Lei;ZHU Jianguo;GUO Chaofeng;NI Xiaoming;LI Yang;CAO Yunxing(Drilling Branch of Shanxi Xishan Coal and Electricity Group,Taiyuan 030053,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Institute of Resources&Environment,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]西山煤电(集团)有限责任公司钻探分公司,山西太原030053 [2]河南理工大学能源科学与工程学院,河南焦作454000 [3]河南理工大学资源环境学院,河南焦作454000

出　　处：《煤矿安全》2021年第4期72-77,共6页Safety in Coal Mines

基　　金：国家科技重大专项资助项目(2017ZX05064002);国家自然科学基金资助项目(41872174)。

摘　　要：缓冲土酸是煤层解堵常用的酸液之一,但HF、HCl和CH3COOH在其中的浓度配比不同,导致酸化解堵效果不同。为此进行了不同浓度HF、HCl和CH3COOH配比条件下对泥浆钻井液固相颗粒的溶蚀实验和H+反应速率实验,优选出缓冲土酸解堵的最优浓度配比。根据煤样解堵前、后的渗透率变化对优选酸液解堵效果进行了评价。结果表明:缓冲土酸体系中主要是HF与钻井液中的固相颗粒反应,HF中加入HCl会促进反应,加入CH3COOH则会降低反应速率;当HF浓度为9%时,溶蚀率最高,能达到45.02%;优选出的缓冲土酸的浓度配比为3%HCl+9%HF+7%CH3COOH;经优选的缓冲土酸解堵煤样的渗透率能恢复到污染堵塞前的92.08%~110.88%。Buffered soil acid is one of the commonly used acid solutions for removing plugging of coal seam.However,the effect of acidizing and plugging removal is different when the concentration ration of HF,HCl and CH3 COOH is different.In this paper,the corrosion experiments and H+reaction rate experiments of solid particles in mud drilling fluid with different concentrations of HF,HCl and CH3 COOH were carried out,on this basis,the optimal concentration ratio of buffering acid is obtained.According to the permeability change of coal sample before and after removing plugging,the decontamination effect of optimized acid solution was evaluated.The results show that in the buffering acid system,HF mainly reacts with the solid particles in the drilling fluid.The addition of HCl in HF will promote the reaction,while the addition of CH3 COOH in HF will reduce the reaction rate.When the concentration of HF is 9%,the dissolution rate is the highest,which can reach 45.02%.The optimized concentration ratio of buffering mud acid is 3%HCl+9%HF+7%CH3 COOH.The permeability of the optimized buffering acid removing plugging coal sample can be restored to 92.08%-110.88%of that before pollution.

关 键 词：缓冲土酸 最优配比 溶蚀率 H+反应速率 解堵效果 

分 类 号：TD712[矿业工程—矿井通风与安全]