Heating tar sands formations while controlling pressure

E - Fixed Constructions – 21 – B

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E21B 43/24 (2006.01) E21B 36/00 (2006.01) E21B 43/30 (2006.01)

Patent

CA 2666947

A method for treating a tar sands formation is disclosed. The method includes heating at least a section of a hydrocarbon layer in the formation from a plurality of heaters located in the formation. A pressure in the majority of the section is maintained below a fracture pressure of the formation. The pressure in the majority of the section is reduced to a selected pressure after the average temperature reaches a temperature that is above 240 °C and is at or below pyrolysis temperatures of hydrocarbons in the section. At least some hydrocarbon fluids are produced from the formation.

L'invention concerne un procédé pour traiter une formation de sables bitumineux. Le procédé comprend le chauffage d'au moins une section d'une couche d'hydrocarbure dans la formation par une pluralité de dispositifs de chauffage situés dans la formation. Une pression dans la majorité de la section est maintenue en dessous d'une pression de rupture de la formation. La pression dans la majorité de la section est réduite à une pression sélectionnée une fois que la température moyenne a atteint une température qui est supérieure à 240 °C, et est au niveau de températures de pyrolyse d'hydrocarbures dans la section, ou inférieure à celles-ci. Au moins certains fluides d'hydrocarbure sont produits à partir de la formation.

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