Expandable downhole tool assemblies, bottom-hole assemblies, and related methods

A bottom-hole assembly, comprising:

• an expandable tool module comprising a body, at least one blade configured as a reamer blade or a stabilizer blade, and a drive element coupled to the at least one blade, wherein axial movement of the drive element within the body will result in movement of the at least one blade;
• and
• an activation module comprising another body coupled to the body and an activation member coupled to the drive element, the activation member configured to pull the drive element into an activated position to move the at least one blade into an expanded position and to push the drive element into a deactivated position to move the at least one blade into a retracted position;
• wherein the expandable tool module is a slave unit configured to not be activated without the activation module.

A method of using an expandable tool assembly, the method comprising:

• coupling a body of an expandable tool module to a body of an activation module wherein the expandable tool module is a slave unit configured to not be activated without the activation module;
• disposing the expandable tool module and the activation module in a borehole of a subterranean formation;
• pulling, with the activation module, an axially movable drive element at least partially within the body of the expandable tool module to engage at least one blade of the expandable tool module with the subterranean formation;
• and
• reaming the borehole with the at least one engaged blade or stabilizing the expandable tool assembly in the borehole with the at least one engaged blade.