The causes of using traditional wetdrilling difficultly are analysed. And the wetdrilling method of the coal electric drill of external spray hydroelectric interlock is related.
分析了传统湿式打眼难以推广应用的原因,叙述了外喷雾水电联锁煤电钻湿式打眼法。
2
Underhole drilling technology solved the difficulties of drilling in wet layers, deepened the drilling under water, and found an effective method of drilling hi pouring crushing layer.