FIELD: mining.
SUBSTANCE: proposed invention comprises using uphole of outer string with filtration section aligned with drill string that doubles as protective string that, thanks to high torques can overcome friction forces caused by rock pressure, producing water column in annular space between hoe walls and outer string solid part outer surface equal to the height of column from its sealer to filtration part that kills hydrostatic pressure of local water, and using a controlled gap between outer and drill strings to generated throttling effect of releasing water-sand mix from the bed.
EFFECT: reduced load on drill and outer strings, possibility to control drilling height.
2 cl, 2 dwg
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