Patent ID: 9140085
Filing Date: 2015-09-22
Classification: E21B,G01V

Abstract:
1. A downhole positioning apparatus comprising: a carrier configured to be disposed in a borehole in an earth formation, the carrier including at least one measurement tool and an extendable member configured to be actuated between a first position in which the extendable member is disposed at the carrier, a second position in which the member is extended from an outer surface of the carrier, and an intermediate position in which the member is partially extended; and a receiving element fixedly disposed at a borehole casing and defining a path along a surface of the casing, the receiving element configured to receive the extendable member when the member is in the second position or the intermediate position and guide the carrier to a selected orientation as the carrier is moved axially through the borehole; and an actuator configured to move the extendable member between the first position, the second position and the intermediate position, and maintain the extendable member at the intermediate position as the extendable member is moved along the receiving element.