PROCEDURE TO CLEAN SHAFT OF BOREHOLE Russian patent published in 2001 - IPC

FIELD: mining industry, technology of removal of slime from shaft of borehole. SUBSTANCE: procedure includes lowering of pipe string into borehole with inclination angle of 30 degrees as minimum. Then pipe string is rotated. Backward circulation of flushing fluid is created over entire shaft of borehole. Flow rate of flushing fluid provides for turbulent mode of flow of flushing fluid across inlet to pipe string with preservation of laminar mode in pipe clearance. EFFECT: expanded application field of procedure, increased efficiency of cleaning and simplification of procedure. 1 tbl