Varying properties along lengths of temperature limited heaters

Details Varying properties along lengths of temperature limited heaters Varying properties along lengths of temperature limited heaters

E - Fixed Constructions

21

B

E21B 43/24 (2006.01) E21B 36/04 (2006.01)

Patent

CA 2606295

A system for heating a subsurface formation is described. The system includes an elongated heater in an opening in the formation. The elongated heater includes two or more portions along the length of the heater that have different energy outputs. At least one portion of the elongated heater includes at least one temperature limited portion (240) with at least one selected temperature at which the portion provides a reduced heat output. The heater is configured to provide heat to the formation with the different energy outputs . The heater heats one or more portions of the formation at one or more selected heating rates.

L~invention décrit un système pour chauffer une formation en subsurface. Le système ci-décrit comporte un radiateur allongé dans une ouverture de la formation. Sur sa longueur, le radiateur allongé comporte deux parties, ou plus, dégageant différents niveaux d~énergie. Au moins une partie du radiateur allongé comporte au moins une partie à limite de température (240) avec au moins une température sélectionnée à laquelle la partie dégage une chaleur réduite. Le radiateur est configuré pour fournir de la chaleur à la formation suivant les différents niveaux d~énergie. Le radiateur chauffe une ou plusieurs partie(s) de la formation à un ou plusieurs régime(s) de chauffage sélectionné(s).

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