Directional drilling tool

Claim 1

A DIRECTIONAL DRILLING DEVICE FOR AUTOMATICALLY ALTERING THE DIRECTION OF AN INCLINED WELL BORE INCLUDING, (A) A ROTATABLE DRILL STRING HAVING A FLUID PASSAGE EXTENDING LONGITUDINALLY THERETHROUGH AND HAVING A DRILLING BIT AFFIXED TO THE LOWER END THEREOF, (B) A HOLLOW MANDREL ROTATABLY MOUNTED ON SAID ROTATABLE DRILL STEM, (C) A PROJECTION ON SAID HOLLOW MANDREL, (D) FLUID DISCHARGE VENT MEANS IN SAID PROJECTION AT AN ANGLE RELATIVE TO SAID MANDREL, (E) FLUID PASSAGE MEANS IN SAID HOLLOW MANDREL COMMUNICATING WITH SAID FLUID DISCHARGE VENT MEANS, AND (F) FLUID CONDUIT MEANS IN SAID DRILL STRING CONNECTING SAID LONGITUDINAL FLUID PASSAGE THEREIN FOR CONDUCTING FLUID THROUGH SAID FLUID DISCHARGE VENT MEANS TO BE DISCHARGED THEREFROM AT AN ANGLE RELATIVE TO SAID MANDREL WHEREBY SAID PROJECTION IS URGED TO ENGAGEMENT WITH THE INNER WALL OF THE WELL BORE AND THEREBY URGES SAID DRILL STRING AND DRILLING BIT LATERALLY TO CHANGE THE DIRECTION OF THE INCLINED WELL BORE.