Expandable reamer assemblies, bottom-hole assemblies, and related methods

摘要

Expandable reamer assemblies include an expandable reamer module and an activation module. An outer tubular body of the activation module is rigidly coupled to a tubular body of the expandable reamer module, and an activation member of the activation module is coupled to a sleeve of the expandable reamer module, the sleeve is coupled to at least one blade and configured to move the at least one blade into an extended position. The sleeve moves axially responsive to axial movement of the activation member. Bottom-hole assemblies include an expandable reamer module and an activation module. The activation module is coupled to the expandable reamer module and configured to provide a motive force to the sleeve to move the sleeve opposite a direction of flow of drilling fluid. Methods of using expandable reamer modules include pairing two substantially identical expandable reamer modules and two respective different activation modules.

主权项

1. An expandable reamer assembly for reaming a subterranean borehole, the expandable reamer assembly comprising:
an expandable reamer module comprising:
a tubular body having a longitudinal axis and an inner bore;at least one blade coupled to the tubular body and configured to move between a retracted position and an extended position; anda sleeve disposed within the inner bore of the tubular both and coupled to the at least one blade, the sleeve configured to axially move relative to the tubular body to move the at least one blade into the extended position; an activation module comprising:
an outer tubular body rigidly coupled to the tubular body of the expandable reamer module, the outer tubular body of the activation module having an inner bore; andan activation member at least partially disposed within the inner bore of the outer tubular body of the activation module, a longitudinal end of the activation member coupled to the sleeve to axially move the sleeve relative to the tubular body of the expandable reamer module responsive to axial movement of the activation member and to axially move the sleeve toward the activation modules; and wherein the expandable reamer module is a slave unit configured to not be activated without the activation module.