超声波洗井在地浸采铀生产过程中的解堵应用研究

Study on the Application of Ultrasonic Well Washing in the Process of In-situ Leaching Uranium Production

蒙其古尔矿床CO_(2)+O_(2)地浸采铀工艺过程中出现抽注液钻井堵塞问题,导致已生产的各采区抽注液量下降趋势明显,最大降幅达到50%,采用常规压缩空气洗井未取得明显的效果。文章介绍了超声波洗井技术原理,结合地浸采铀生产特点,在蒙其古尔矿床进行了超声波洗井于近井地带的解堵试验研究,开展了地面模拟条件下的除垢试验和抽注液钻井的超声波洗井试验。在发生器频率为16~23 kHz,井下功率为5~6 kW,作业时间为2~6 h/m的工作参数下,抽液孔的水量增幅达43%以上;注液孔水量增幅为-8%~43%,平均为11%。超声波对注液井和抽液井的清洗效果相差较大,主要原因是超声波虽能有效剥离结垢物,但注液井中剥离的垢物未能有效返排。现场试验表明,超声波技术在地浸采铀生产井中具有一定的解堵作用,但对于深井的清洗,在超声功率、作用时间及返排措施等方面还需进一步研究。

The plugging problem occurred in the process of CO_(2)+O_(2)in-situ leaching of uranium in 735 plant led to the obvious downward trend of the pumping and injection volume in each mining area,with a maximum decline of 50%,and the conventional compressed air well wash method fail to achieve significant effect.By understanding the principle of ultrasonic well flushing technologyand the characteristics of in-situ leaching uranium production,the experimental research of ultrasonic well flushing was carried out near plugging well in 735 plant,the scale removal test was carried out under the ground simulation conditions by the ultrasonic well flushing of pumping and injection drilling.Under the working parameters of generator frequency of 16~23 kHz,downhole power of 5~6 kW,and operation time of 2~6 h/m.The increase of water quantity in the pumping hole is more than 43%,and that of the injection hole is-8%~43%,with an average of 11%.The main reason for the difference between the punming and injectin well is that the scale in the injection well can􀆳t flow back effectively although ultrasonic can effectively remove the scale.The field test showed that the ultrasonic technology has a certain role in removing the plug in the in-situ leaching uranium production wells,but for the cleaning of deep wells,the ultrasonic power,action time and flowback measures need to be further studied.