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Electrical resistance heating of subterranean viscous fluid deposits is provided by a wellbore having a conductive casing section and a coupling disposed in proximity to the formation. An elongated, flexible fluid injection or withdrawal tube extends into the wellbore, is secured to the coupling, an

Electrical resistance heating of subterranean viscous fluid deposits is provided by a wellbore having a conductive casing section and a coupling disposed in proximity to the formation. An elongated, flexible fluid injection or withdrawal tube extends into the wellbore, is secured to the coupling, and is connected to a source of electrical energy. The tube is preferably of composite construction having an inner steel core, an outer copper layer and a reinforced plastic corrosion resistant coating over the copper layer.

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In a well system for producing fluids from a subterranean formation, casing means forming a first wellbore to provide for conducting fluids between a point on the earth\s surface and said formation, said casing means including a first casing section formed of electrically conductive material and ext

In a well system for producing fluids from a subterranean formation, casing means forming a first wellbore to provide for conducting fluids between a point on the earth\s surface and said formation, said casing means including a first casing section formed of electrically conductive material and extending within a zone of said formation through which fluids are to be conducted between said formation and said first wellbore, a coupling member disposed in said first wellbore and connected to said first casing section for conducting electric current between said coupling member and said first casing section, an elongated electrically conductive tube extending within said casing means from said surface to said coupling member for conducting fluid between said surface and said formation through a cavity formed in said first wellbore by said first casing section, said tube including means cooperable with said coupling member to mechanically and electrically connect said tube to said coupling member for conducting electric current between a source of electric energy and said formation through said coupling member and said tube.