Apparatus for "in-situ" extraction of bitumen or very heavy oil

E - Fixed Constructions – 21 – B

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E21B 43/24 (2006.01) H05B 6/02 (2006.01)

Patent

CA 2697820

In order to lower the viscosity of bitumen or very heavy oil in deposits, thermal energy is applied to the deposit, especially inductive and/or resistive heat being optionally applied in addition to vapor that is applied according to the steam assisted gravity drainage (SAGD) process. According to the invention, a high-frequency generator feeds electric power to a linearly extended conductor loop (10, 15, 20) at a predefined depth of the deposit, the inductance of the conductor loop (10, 15, 20) being compensated in some sections or continuously. Advantageously, one of the conductors (10, 15) of the conductor loop (10, 15, 20) can be disposed substantially in a vertical direction above the extraction pipe (102). Models have shown that an extraction system can be exclusively operated by means of a device for inductive heating (electromagnetic gravity drainage (EMGD) process).

Afin de réduire la viscosité d'un bitume ou d'une huile très lourde dans un gisement, on introduit de l'énergie thermique dans ce gisement, en particulier en utilisant, un chauffage inductif et/ou résistif, outre l'injection de vapeur, selon le procédé DGMV (drainage par gravité au moyen de vapeur). Selon l'invention, une boucle de conducteurs (10, 15, 20) s'étendant linéairement est alimentée en puissance électrique par un générateur haute-fréquence à une profondeur prédéfinie du gisement, l'inductance linéique de la boucle de conducteurs (10, 15, 20) étant compensée de manière continue ou discontinue. Avantageusement, l'un des conducteurs (10, 15) de la boucle de conducteurs (10, 15, 20) peut être agencé de manière sensiblement verticale au-dessus du tube d'extraction (102). Des modélisations ont permis de montrer que le système d'extraction peut fonctionner exclusivement au moyen d'un dispositif de chauffage par induction (procédé de drainage par gravité électromagnétique).

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