1
Robert Albertus Van Dijk: Drilling system with expandable sleeve. Shell Oil Company, January 9, 2007: US07159673 (3 worldwide citation)

A drilling system and method for drilling a borehole into an earth formation is provided. The drilling system has a drill string having a lower section provided with a sleeve which is radially expandable from a retracted mode in which the sleeve extends around the lower drill string section and is r ...


2
Robert Albertus Van Dijk: Drilling system with expandable sleeve. Richard L Lemuth, Shell Oil Company, July 29, 2004: US20040144568-A1

A drilling system and method for drilling a borehole into an earth formation is provided. The drilling system comprises a drill string (1) having a lower section provided with a sleeve (7) which is radially expandable from a retracted mode in which the sleeve extends around said lower drill string s ...