Patent 7757782 was granted and assigned to Schlumberger on July, 2010 by the United States Patent and Trademark Office.
Methods and apparatus for navigating a subterranean tool comprising a body member and a head member steerably associated with the body member. A determining unit is configured to determine a transversal target position of a nose of the head member relative to the body member and a steering unit is configured to steer the head member relative to the body member so that the nose of the head member is located at the transversal target position.