Roller reamer

Claim 1

WELL TOOL ADAPTED FOR CONNECTION INTO A ROTARY DRILL STRING TO FORM ONE ELEMENT THEREOF, COMPRISING, AN UPPER BODY MEMBER HAVING AN UPPER END AND A LOWER END AND A GENERALLY CYLINDRICAL OUTER PERIPHERY AND HAVING MEANS AT THE UPPER END THEREOF FOR MAKING CONNECTION TO ANOTHER DRILL STRING ELEMENT, A LOWER BODY MEMBER HAVING AN UPPER END AND A LOWER END A GENERALLY CYLINDRICAL OUTER PERIPHERY AND HAVING MEANS AT THE LOWER END THEREOF FOR MAKING CONNECTION TO ANOTHER DRILL STRING ELEMENT, AN INTERMEDIATE BODY MEMBER DISPOSED BETWEEN SAID UPPER AND LOWER BODY MEMBERS, THE INTERMEDIATE BODY MEMBER HAVING AN UPPER END CONNECTED TO THE LOWER END OF THE UPPER BODY MEMBER, THE INTERMEDIATE MEMBER HAVING A LOWER END CONNECTED TO THE UPPER END OF THE LOWER BODY MEMBER, SAID UPPER AND LOWER BODY MEMBERS BEING COAXIAL AND OF LARGER MAXIMUM DIAMETER THAN THE MAXIMUM TRANSVERSE EXTENT OF SAID INTERMEDIATE BODY MEMBER LEAVING A SPACE ADJACENT THE INTERMEDIATE BODY MEMBER BETWEEN THE UPPER AND LOWER BODY MEMBERS, AT LEAST ONE AXLE PIN IN SAID SPACE HAVING AN UPPER END SUPPORTED BY SAID UPPER MEMBER AND A LOWER END SUPPORTED BY SAID LOWER MEMBER AND A ROLLER ROTATABLY MOUNTED ON SAID PIN WITHIN THE AXIS OF ROTATION OF THE ROLLER ECCENTRIC TO THE AXIS OF SAID UPPER AND LOWER BODY MEMBERS AND THE OUTER PERIPHERY OF THE ROLLER EXTENDING IN PART BEYOND THE OUTER PERIPHERIES OF THE UPPER AND LOWER BODY MEMBERS, AND FLUID PASSAGE MEANS EXTENDING THROUGH SAID TOOL FROM THE UPPER END OF THE UPPER BODY MEMBER TO THE LOWER END OF THE LOWER BODY MEMBER.