Controlling and assessing pressure conditions during...

E - Fixed Constructions – 21 – B

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E21B 43/16 (2006.01) E21B 43/18 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2684466

A method for treating a tar sands formation includes providing heat to at least part of a hydrocarbon layer in the tar sands formation from a plurality of heaters located in the formation. Heat is allowed to transfer from the heaters to at least a portion of the formation. A pressure in the portion of the formation is controlled such that the pressure remains below a fracture pressure of the formation overburden while allowing the portion of the formation to heat to a selected average temperature of at least about 280 °C and at most about 300 °C. The pressure in the portion of the formation is reduced to a selected pressure after the portion of the formation reaches the selected average temperature.

La présente invention concerne un procédé servant à traiter une formation de sables bitumineux consistant à apporter de la chaleur à au moins une partie d'une couche d'hydrocarbure de la formation de sables bitumineux à partir d'une pluralité de réchauffeurs situés dans la formation. On laisse la chaleur se transférer des réchauffeurs vers ladite ou lesdites portions de la formation. Une pression dans la portion de la formation est contrôlée de façon à ce que la pression reste en dessous d'une pression de fracture de la surcharge de la formation tout en laissant la portion de la formation se réchauffer à une température moyenne sélectionnée d'au moins environ 280 °C et d'au maximum environ 300 °C. La pression dans la portion de la formation est abaissée à une pression sélectionnée une fois que la portion de la formation a atteint la température moyenne sélectionnée.

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