超声波技术对煤粉堵塞筛管的解堵实验

Unblocking experiment of coal fines clogging screen tube by ultrasonic technology

在煤层气开采过程中,煤粉堵塞筛管问题严重影响煤层气井的连续稳定排采。针对煤粉堵塞筛管问题,提出了采用超声波技术对筛管进行解堵的方法,开展了超声波技术对不同粒度和不同成分的煤粉堵塞筛管的解堵实验,探讨了超声波技术对筛管的解堵效果和影响因素。结果表明:随着煤粉粒度(<63μm、63~125μm、>125~300μm)的增大,煤粉的比表面积减小,煤粉所受附着力减小,超声波技术对筛管的解堵效果增强;高岭土能改善煤粉的亲水性,随着煤粉中所含高岭土比例的增加,煤粉颗粒间的疏水引力减小,煤粉所受附着力减小,超声波技术对筛管的解堵效果增强;超声波技术解堵作用时间在0~30 min内,随超声波作用时间的增长,超声波解堵效率降低;在0~10 min内解堵效果最明显,建议超声波解堵时,作用时间大于10 min。

In the process of coalbed methane exploitation,the problem of coal fines blocking the screen tube seriously affects the continuous and stable drainage and production of coalbed methane wells.Aiming at the problem of clogging the screen tube with coal fines,the method of using ultrasonic technology to unblock the screen tube is proposed.The experiments of unblocking the screen tube blocked by coal fines with different particle sizes and compositions are carried out,and the unblocking effect and influencing factors of ultrasonic technology on the screen tube are discussed.The results show that with the increase of coal fines particle size(<63μm,63-125μm and>125-300μm),the specific surface area of coal fines decreases,the adhesion of coal fines decreases,and the effect of ultrasonic technology on screen tube blockage removal increases.Kaolinite can improve the hydrophilicity of coal fines.With the increase of the proportion of kaolinite in coal fines,the hydrophobic attraction between coal fines particles decreases,the adhesion of coal fines decreases,and the effect of ultrasonic technology on screen tube unblocking is enhanced.The action time of ultrasonic technology for blocking removal is within 0-30 min.With the increase of ultrasonic action time,the efficiency of ultrasonic blocking removal decreases.Among them,the action time is most obvious in the time period of 0-10 min.It is recommended that the action time of ultrasonic blocking removal is longer than 10 min.