| 主权项 |
1. A reaming tool for use in reaming a bore, the tool comprising:
a body adapted for location in a bore, the body defining at least one of a rotor and a stator of a rotary drive arrangement; a shaft adapted for location in the body, the shaft defining the other of a stator and a rotor of the rotary drive arrangement; a seal element adapted for location between the shaft and the body, the seal element adapted to define a sealing surface for permitting sealed relative rotation of the rotary drive arrangement, wherein the seal element defines a plain bearing a fluid conduit formed inside the body and in the shaft configured to direct substantially all fluid flow through the reaming tool to the rotary drive arrangement to cause rotation thereof; and a reaming member, wherein relative rotation between the body and the shaft facilitates reaming of the bore by the reaming member. |
