Method for extracting bitumen and/or extra-heavy oil from an...

E - Fixed Constructions – 21 – B

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E21B 43/24 (2006.01)

Patent

CA 2737083

In order to enhance the known SAGD method it has already been proposed that the deposit additionally be heated electrically, in particular inductively. For this purpose an electrotechnical infrastructure is necessary. According to the invention the energy for producing the steam and for the electric heating is generated in situ, for which purpose part of the extracted bitumen and/or extra-heavy oil is burned in an industrial turbine (1, 11) with a downstream generator (2) coupled to the turbine (1, 11). The industrial turbine can be a gas turbine (1) or a steam turbine (11). In particular the industrial turbine (1, 11) with downstream generator (2) is assigned a waste heat recovery steam generator (16) which serves for generating the steam and accordingly takes the form of a boiler. Through intermediate storage of the bitumen and/or ultra-heavy oil produced it is possible to implement a self-contained closed circuit which operates autonomously, independently of any external energy supply, using approx. 20 % of the extracted bitumen and/or extra-heavy oil for the purposes of extraction.

En complément au procédé SAGD (steam assisted gravity drainage) connu, il a déjà été proposé de chauffer également le gisement de façon électrique, en particulier par induction. Pour cela, une infrastructure électrotechnique est nécessaire. Selon l'invention, l'énergie permettant la génération de la vapeur et le chauffage électrique est générée sur place, une partie du bitume et/ou du pétrole extra-lourd extrait étant brûlée dans une turbine industrielle (1, 11) avec le générateur (2) suivant, accouplé à la turbine (1, 11). La turbine industrielle peut être une turbine à gaz (1) ou une turbine à vapeur (11). Une chaudière de récupération de chaleur (16) servant à générer la vapeur et formant par conséquent un chauffe-eau est notamment affectée à la turbine industrielle (1, 11) avec le générateur (2) suivant. Grâce à un stockage intermédiaire du bitume et/ou du pétrole extra-lourd produit, on peut réaliser un circuit fermé en soi qui travaille à l'extraction de façon autonome, indépendamment de l'alimentation en énergie externe, avec environ 20 % du bitume et/ou pétrole extra-lourd déjà extrait.

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