Transmitter system, method of inducing a transient...

G - Physics – 01 – V

Patent

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G01V 3/00 (2006.01)

Patent

CA 2692152

A transmitter system for inducing a transient electromagnetic field in an earth formation comprises an inductive element to generate an electromagnetic field in response to a flow of electric current through the inductive element. Furthermore, switching means arranged to interrupt the flow of electric current through the inductive element, which switching means comprises a primary switch and an auxiliary switch arranged in series connection with each other. The auxiliary switch has a lower breakdown voltage than the primary switch. This induces a transient electromagnetic field in the earth formation. Delay circuitry may impose a time delay between switching of the auxiliary switch relative to switching of the primary switch. A transient electromagnetic response signal may be recorded, and used in a method of producing a mineral hydrocarbon fluid.

L'invention concerne un système de transmission permettant d'induire un champ électromagnétique transitoire dans une formation terrestre, comprenant un élément inductif destiné à générer un champ électromagnétique en réponse à un courant électrique passant à travers l'élément inductif. En outre, un moyen de commutation conçu pour interrompre le passage de courant électrique à travers l'élément inductif comprend un commutateur primaire et un commutateur auxiliaire reliés en série l'un à l'autre. Le commutateur auxiliaire présente une tension de claquage inférieure à celle du commutateur primaire, ce qui induit un champ électromagnétique transitoire dans la formation terrestre. Un ensemble de circuits à retard peut imposer un délai de temporisation entre la commutation du commutateur auxiliaire et la commutation du commutateur primaire. Un signal de réponse électromagnétique transitoire peut être enregistré et utilisé dans un procédé de production de fluide d'hydrocarbures minéraux.

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