Electrical well heating system and method

E - Fixed Constructions – 21 – B

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E21B 36/04 (2006.01) C09K 8/592 (2006.01) E21B 36/00 (2006.01) E21B 41/00 (2006.01) E21B 43/24 (2006.01) E21B 43/243 (2006.01) E21B 43/30 (2006.01)

Patent

CA 2407232

A system for heating an underground hydrocarbon containing formation, such as a coal or shale-oil deposit, comprises an elongate electrical conductor within a heater well traversing the formation to provide radiant heat to at least a portion of the formation during use such that pyrolysis of hydrocarbons is initiated, which conductor is at least partly surrounded by an electrical insulation layer which comprises a granular insulating mineral material which layer is encased in a corrosion resistant sheath, thereby providing an inexpensive and durable electrical heater.

Ce système permettant de chauffer une formation souterraine contenant des hydrocarbures, notamment du charbon ou un dépôt de schiste bitumineux, comporte un élément conducteur électrique de forme allongée placé dans un puits générateur de chaleur traversant la formation et ce, afin de produire une chaleur rayonnante dans au moins une partie de la formation en cours d'utilisation, de sorte que la pyrolyse des hydrocarbures peut se produire. Ce conducteur est au moins en partie entouré d'une couche d'isolation électrique comprenant une matière minérale granulaire isolante. Cette couche est protégée par une gaine résistant à la corrosion, ce qui permet d'obtenir un générateur de chaleur électrique peu coûteux et durable.

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