Selective excitation of heating electrodes for oil wells

E - Fixed Constructions – 21 – B

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E21B 43/24 (2006.01) E21B 36/04 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2174980

A control for an electrical heating system that enhances production from an oil well, particularly a horizontal oil well; the well includes an initial well bore extending downwardly from the surface of the earth through one or more overburden formations and into communication with a producing well bore that extends or deviates outwardly from the initial well bore into an oil producing formation. The heating system includes an array of short, electrically conductive heating electrodes extending longitudinally through the producing well bore. The heating system further includes apparatus for electrically energizing electrodes that are close to each other with A.C. power; the A.C. power supplied to electrodes near each other has a phase displacement of at least 90°, usually 120° or 180°, between electrodes. The control includes plural power switches, each connected to at least one heating electrode; each power switch is conductive only up to a predetermined limit (usually a temperature limit). In one embodiment, each power switch includes a sensor responsive to the operating condition of its heating electrode. Another embodiment employs a telemeter circuit to actuate the power switches with sensors that are separate from the power switches.

La présente invention vise un dispositif de commande/régulation pour système de chauffage destiné à accroître la production d'un puits de pétrole, plus particulièrement d'un puits horizontal, comprenant un puits d'injection se prolongeant de la surface terrestre jusque dans une ou plusieurs couches de morts-terrains, et communiquant avec un puits de production se prolongeant, lui, du puits d'injection jusqu'à une couche pétrolifère. Le système de chauffage comprend une série de petites électrodes conductrices, disposées les unes à côté des autres et se prolongeant dans le sens longitudinal à l'intérieur du puits producteur. Le système comprend également un bloc d'alimentation en c.a. permettant un angle de déphasage entre les électrodes d'au moins 90 degrés, et habituellement de 120 degrés ou 180 degrés. Le dispositif de commande/régulation comprend un certain nombre d'interrupteurs, chacun relié à au moins une électrode de chauffage, asservis à des températures limites hautes et basses préétablies. Selon une variante, chaque interrupteur comporte un capteur sensible aux conditions de fonctionnement de l'électrode à laquelle l'interrupteur est relié. Selon une autre variante, le dispositif comporte un circuit de télécommande des interrupteurs, les capteurs n'étant pas, dans ce cas, incorporés aux interrupteurs.

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