MUD DIVERTER AND INSIDE BLOWOUT PREVENTER DRILLING TOOL

摘要

A tubular member positioned in the drill string above a drill bit includes a rotatable ball valve to divert drilling fluid and the like in the well bore if the drill bit nozzles become clogged thus permitting continued circulation of the drilling fluid. The member also includes a movable sleeve to automatically prevent flow of the drilling fluid or the like up the drill string from the drill bit. The rotatable ball valve tends to prevent clogging of the drill bit nozzles by maintaining smaller channeled openings in the rotatable ball valve unclogged by wiping the ball valve surface and flushing the wiped clogging particles into the well bore.