Electrical heating systems for low-cost retrofitting of oil...

E - Fixed Constructions – 21 – B

Patent

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Details

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

Patent

CA 2090629

The present invention provides a new and improved efficient power delivery system which, when combined with an improved downhole apparatus, selectively heats the casing or screen immediately adjacent to the formation. Two generic casing heating systems which are suitable to be combined with an improved and efficient power delivery system are described. Such heating systems include direct ohmic heating of the casing or screen immediately adjacent to the formation or induction heating apparatus to heat the casing or screen by eddy-current effects. Optimum design details which permit the more cost-effective installations of a retrofit system while at the same time maintaining a reasonable power delivery efficiency are also described. Such optimum design parameters include the selection of the frequency and providing matching elements downhole with the type of casing or screening heating systems employed.

La présente invention fournit un nouveau système amélioré de fourniture d'énergie efficace qui, en combinaison avec un appareil de fond amélioré, chauffe de façon sélective le revêtement ou la grille immédiatement adjacent à la formation. Deux systèmes de chauffage de revêtement génériques pouvant être combinés avec un système amélioré et efficace de fourniture d'énergie sont décrits. De tels systèmes de chauffage comprennent le chauffage ohmique direct du revêtement ou de la grille immédiatement adjacents à la formation, ou un appareil de chauffage par induction pour chauffer le revêtement ou la grille par induction. Des détails de conception optimale qui permettent des installations rentables d'un système de réadaptation tout en maintenant une efficacité raisonnable de fourniture d'énergie sont également décrits. Ces paramètres de conception optimale comprennent la sélection de la fréquence et la fourniture d'éléments de fond correspondants avec le type de système de chauffage de revêtement ou de grille utilisé.

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