FIELD: soil or rock drilling; mining.
SUBSTANCE: group of inventions relates to a self-guided nozzle of a drilling bit of a downhole tool to form a wellbore in a subterranean formation, a drilling bit of a downhole tool to form a wellbore in a subterranean formation and a method of drilling a wellbore in an underground formation. Said self-guiding nozzle comprises bushing arranged to be fitted in drill bit passage and movable housing to be arranged to displace in bushing and having not more than one fluid passage channel. Channel has a non-linear shape and a central line of the channel passing through it and is curvilinear to form a spiral flow path passing through it. Fluid flowing through the channel facilitates rotation of the movable housing in the drill bit passage.
EFFECT: technical result consists in provision of ejection of movable jet of fluid medium around drill bit for drill cuttings removal.
27 cl, 21 dwg
