Liquid percussion motor

Abstract

Abstract A FLUID ACTUATED TOOL FOR APPLYING REPEATED PRECUSSIVE BLOWS TOA DRILL BIT IN TYHE DRILLING OF OIL AND GAS WELLS IS DISCLOSED. IN PARTICULAR, THE INVENTION CONCERNS PERCUSSION MOTOR FOR INCORPORATION IN DRILL STRINGS, CAUSING DRILL BITS TO VIBRATE OR OSCILLATE AXIALLY AT THE SAME TIME THEY ARE BEING ROTATED FOR THE DRILLING OF SUCH WELLS. THE DISCLOSURE INCLUDES A PERCUSSION MOTOR CONTAINING TWO MOVING PARTS, A STEPPED PISTON-TYPE HAMMER AND A CENTRAL CYLINDRICAL VALVE ASSEMBLY. THE STEPPED PISTON-TYPE HAMMER IS ARRANGED IN A MATING STEP-TYPE HOUSING. AN ANVIL IS SLIDEABLY MOUNTED WITHIN THE HOUSING BELOW THE HAMMER AND ARRANGED FOR ONLY LIMITED AXIAL MOVEMENT, AND ARRANGED TO BE STRUCK BY THE HAMMER. THE CENTRAL VALVE ASSEMBLY COOPERATES WITH PARTS OF THE HAMMER AND FLOWING FLUID AND THUS OSCILLATES BETWEEN AN UPPER SEAT IN THE LOWER PART OF THE HAMMER AND A LOWER SEAT IN THE TOP ANVIL. THIS VALVE OSCILLATION IN TURN APPLIES A RESULTANT FORCE ALTERNATIVELY TO THE TOP AND BOTTOM OF THE SLIDEABLY MOUNNTED HAMMER, CAUSING IT TO OSCILLATE AXIALLY. IN A PREFERRED EMBODIMENT, MEANS ARE PROVIDED TO DAMPEN THE UPPER END OF THE VALVE MOTION. VARIOUS EMBODIMENTS OF THE INVENTION ARE DESCRIBED.

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