Motor driven drill assembly for oil wells and the like

Claim 1

A DRILL ASSEMBLY FOR OIL WELLS AND THE LIKE COMPRISING AN ELONGATED HOUSING, A DRILL MOUNTED ON THE LOWER END OF SAID HOUSING FOR ROTATION ABOUT THE LONGITUDINAL AXIS THEREOF, MEANS ON SAID HOUSING AND DEPENDENT UPON FLUID PRESSURE WITHIN SAID HOUSING FOR ENGAGING THE WALLS OF A WELL BORE FOR PREVENTING ROTATION OF SAID HOUSING WITH RESPECT TO THE WALLS OF THE WELL BORE, A RING GEAR MOUNTED ABOUT SAID HOUSING AND CONNECTED TO DRIVE SAID DRILL, A FLUID MOTOR OF THE IMPULSE TYPE HAVING A ROTOR MOUNTED IN SA ID HOUSING FOR ROTATION ON AN AXIS NORMAL TO SAID LONGITUDINAL AXIS, SAID ROTOR HAVING A SHAFT EXTENDING THROUGH SAID HOUSING AND A PINION GEAR ON SAID SHAFT OUTSIDE SAID HOUSING AND MESHING WITH SAID RING GEAR, MEASN FOR DELIVERING FLUID UNDER PRESSURE THROUGH SAID HOUSING TO ACTUATE SAID ROTATION PREVENTING MEANS AND FOR PRODUCING A FLUID JET DIRECTED AGAINST SAID ROTOR IN DRIVING RELATIONSHIP THEREWITH TO ACTUATE SAID DRILL THROUGH SAID GEARS, AND MEANS DEPENDENT UPON FREE SUSPENSION OF SAID ASSEMBLY FOR SUBSTANTIALLY CUTTING OFF FLUID FLOW AND BYPASSING SAID FLUID UNDER PRESSURE FROM SAID HOUSING TO RELEASE SAID ROTATION PREVENTING MEANS AND CONCURRENTLY TO SUBSTANTIALLY CUT OFF FLUID FLOW AND TO BYPASS THE DRIVING FLUID AROUND SAID MOTOR TO STOP SAID MOTOR.