Patent ID: 6918452
Filing Date: 2005-07-19
Classification: E21B

Abstract:
1. An apparatus for drilling a well, comprising: a drill string having an inner passage; a tublar outer member connected into the drill string and having an axial bore, the tublar outer member having upper and lower portions that telescopingly engage one another and are axially movable relative to each other between a retracted position and an extended position; a tubular inner member located in the bore of the outer member, the inner member having an axial passage that communicates with the inner passage of the drill string, the inner member having an outer diameter smaller than a diameter of the bore; and a valve in the axial passage of the inner member that is actuated by selected movement of the upper and lower portions of the tubular outer member in the drill string between the retracted and extended positions for opening and closing the axial passage.