METHODS AND APPARATUS FOR NAVIGATING A TOOL DOWNHOLE

摘要

Methods and apparatus for navigating a subterranean tool (20) comprising a body member (100) and a head member steerably associated with the body member (200). A determining unit (800) is configured to determine a transversal target position of a nose of the head member relative to the body member and a steering unit (850) is configured to steer the head member relative to the body member so that the nose (210) of the head member is located at the transversal target position.