Single-well through casing induction logging tool

G - Physics – 01 – V

Patent

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Details

G01V 3/28 (2006.01)

Patent

CA 2745013

Methods and related systems are described for making electromagnetic measurements of a subterranean rock formation (100; 700) through a conductive casing (176; 704) of a borehole. A number of transmitters/receivers (122; 126;...; 708; 710;...) are deployed into single well having a conductive casing (176; 704). A magnetic field is induced through the conductive casing (176; 704) and into a surrounding subterranean rock formation (100; 700), and the magnetic field is detected by the receivers. The receivers have main windings, feedback winding and bucking windings. One of the receiver coils in the tool string is excited at a time, and induced voltages at all of the other receiver coils, either in straight mode, or in feedback mode, are measured.

La présente invention concerne des procédés et systèmes correspondants permettant de faire des mesures électromagnétiques d'une formation rocheuse souterraine (100; 700) au moyen du tubage conducteur (176; 704) d'un puits de forage. Un certain nombre d'émetteurs-récepteurs (122; 126;...; 708; 710;...) sont déployés dans un puits unique garni d'un tubage conducteur (176; 704). Un champ magnétique est induit à travers le tubage conducteur (176; 704) de manière à pénétrer dans la formation rocheuse souterraine environnante (100; 700), et le champ magnétique est détecté par les récepteurs. Ces récepteurs comportent des enroulements principaux, des enroulements de rétroaction, et des enroulements de compensation. Un seul des enroulements de récepteurs du train d'outil est excité à la fois, et les tensions induites au niveau de chacun des autres enroulements de récepteurs, soit en mode direct, soit en mode rétroaction, sont mesurées.

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