1
Richard A Hinson, Harold J Vinegar: Wellhead with non-ferromagnetic materials. Shell Oil Company, May 19, 2009: US07533719 (169 worldwide citation)

Wellheads for coupling to a heater located in a wellbore in a subsurface formation are described herein. At least one wellhead may include a heater located in a wellbore in a subsurface formation; and a wellhead coupled to the heater. The wellhead may be configured to electrically couple the heater ...


2
Richard A Hinson, Harold J Vinegar: Wellhead with non-ferromagnetic materials. Shell Oil Company, December 20, 2007: US20070289733-A1

Wellheads for coupling to a heater located in a wellbore in a subsurface formation are described herein. At least one wellhead may include a heater located in a wellbore in a subsurface formation; and a wellhead coupled to the heater. The wellhead may be configured to electrically couple the heater ...