Patent ID: 9080409
Filing Date: 2015-07-14
Classification: E21B,Y10T

Abstract:
1. A method for coupling a heating section and an overburden section of an insulated conductor heater, comprising: coupling a core of the heating section to a core of the overburden section, wherein a diameter of the core of the heating section is less than a diameter of the core of the overburden section; placing a first insulation layer comprising one or more blocks of insulation over the core of the heating section, wherein at least part of an end portion of the core of the heating section is exposed beyond an end of the blocks comprising the first insulation layer; placing a second insulation layer comprising one or more blocks of insulation over the core of the overburden section, wherein at least one block at an end of the second insulation layer extends over the exposed portion of the core of the heating section with a gap between the at least one block and the exposed portion of the core, and wherein a thickness of the second insulation layer is less than a thickness of the first insulation layer and an outer diameter of the overburden section is substantially the same as an outer diameter of the heating section; and placing an outer electrical conductor around the heating section and the overburden section.