DEVICE FOR DRYING DESCENDING EXPLOSIVE WELLS Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: tubular sealing member made of flexible material with weighting material fixed on its lower end is lowered into the well. As soon as it reaches the well face, compressed air is supplied through pipe into the space of sealing member. Compressed air is supplied to the well through the section of pipe or holes and annular gap. Slime in the well is weighed, and sealing member gets stretched and pressed to the well walls. An air chamber is formed in the well between its face and sealing member. As the device is being lifted, it forces water out of the well. EFFECT: facilitated procedure. 4 cl, 3 dwg