Multilateral well and electrical transmission system

E - Fixed Constructions – 21 – B

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Details

E21B 34/06 (2006.01) E21B 17/00 (2006.01) E21B 41/00 (2006.01) E21B 43/10 (2006.01) E21B 43/30 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2360930

A multilateral well and electric transmission system comprises a branch well tubular (12, 13) in a branch wellbore (2, 3) which is connected in an electrically conductive manner to a primary well tubular (11) in a primary wellbore such that the primary and branch well tubulars form a link for transmission of electrical power and/or signals between the primary and branch wellbores so that low voltage electrical power can be transmitted from the surface to a battery (71) in the branch wellbore to trickle-charge the battery (71) and signals from battery-actuated measuring and control equipment in the branch wellbore can be transmitted back to surface via the walls of the electrically interconnected primary (11) and branch (12, 13) well tubulars.

Cette invention se rapporte à un puits multilatéral et à un système de transmission électrique, qui utilisent un tubage de puits ramifié (12, 13) dans un trou de forage ramifié (2, 3), ce tubage étant raccordé de façon électroconductrice à un tubage de puits principal (11) dans un trou de forage principal, de telle sorte que le tubage du puits principal et le tubage du puits ramifié forment une liaison pour la transmission du courant électrique et/ou des signaux entre le trou de forage principal et le trou de forage ramifié. Ainsi, le courant électrique basse tension peut être transmis de la surface à une batterie (71) placée dans le trou de forage ramifié, en vue de charger en régime d'entretien ladite batterie (71), et les signaux provenant des appareils de mesure et de commande fonctionnant sur batterie dans le trou de forage ramifié peuvent être retransmis à la surface via les parois des tubages électriquement reliés du puits principal (11) et du puits ramifié (12, 13).

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