Patent ID: 8191655
Filing Date: 2012-06-05
Classification: E21B

Abstract:
1. An apparatus for reaming a wellbore, the apparatus comprising: a tubular string extendable to a surface of the wellbore; a mandrel coupled to a downhole end of the tubular string, the mandrel including at least one groove in a sidewall portion thereof; a sleeve at least partially positioned about the exterior of the mandrel such that longitudinal travel of the mandrel in at least a first direction relative to the sleeve rotates the sleeve relative to the mandrel; a reamer shoe coupled to a downhole end of the sleeve such that rotation of the sleeve rotates the reamer shoe; and at least one coupling device operably associated with the sleeve and extendable into the at least one groove such that the longitudinal travel of the mandrel relative to the sleeve causes the coupling device to slide within the groove; wherein weight applied to the reamer shoe from the tubular string shifts the mandrel in the first longitudinal direction relative to the sleeve, thereby rotating the reamer shoe; and wherein fluid pressure applied to the reamer shoe from the tubular string longitudinally urges the mandrel in a second longitudinal direction relative to the sleeve.