Divergent fluid nozzle for drilling tool

摘要

A drilling fluid nozzle 12 mounted in the end of an earth drilling tool 10 has a flow channel defined by a surrounding wall 16 which diverges at an angle of 30 degrees or less, such that the exiting fluid "adheres" to the wall in a laminar manner due to the Coanda effect. This configuration minimizes clogging, and implements ready unclogging.