Patent ID: 8813871
Filing Date: 2014-08-26
Classification: E21B

Abstract:
1. An expandable apparatus for use in a subterranean formation, comprising: a tubular body including one or more components; at least one of a plurality of blades and a plurality of bearing pads carried by at least one component of the tubular body and mounted to enable positioning thereof at a retracted position and at least one extended position; and an actuation mechanism configured to move the at least one of the plurality of blades and the plurality of bearing pads linearly, simultaneously and repeatably between the retracted position and the at least one extended position and operable in response to a drive source other than movement of the tubular body, wherein the drive source is selected from the group consisting of drilling fluid pressure within the tubular body in communication with the actuation mechanism and fluid pressure generated downhole in communication with the actuation mechanism and the actuation mechanism comprises at least one of a hydraulically actuated valve and an electrically actuated valve to selectively control the simultaneous, repeatable movement of the at least one of a plurality of blades and a plurality of bearing pads using the drilling fluid pressure within the tubular body in communication with the actuation mechanism or fluid pressure generated downhole in communication with the actuation mechanism.