A borehole measurement system employing electromagnetic wave...

G - Physics – 01 – V

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G01V 3/30 (2006.01)

Patent

CA 2185029

This invention is directed toward the determination of geophysical parameters of earth formations penetrated by a borehole. The invention is more particularly directed toward the determination of geophysical properties from measures of electromagnetic properties of earth formations in the vicinity of a borehole either during the drilling of the borehole or subsequent to the drilling of the borehole. The downhole instrument component comprises one or more transmitters and a plurality of receivers axially spaced along a downhole subassembly, and is preferably conveyed along the borehole by means of a drill string. Improved electronic circuitry and data processing methods are used to eliminate the adverse effects of impedance changes and mutual coupling of the receiving antennas. Parallel data processing methods are used to minimize propagation of systematic errors in computed parameters of interest. The quality of the measured and computed parameters of interest are also monitored.

La présente invention concerne la détermination de paramètres géophysiques de formations géologiques rencontrées lors du forage d'un puits. L'invention concerne plus particulièrement la détermination des propriétés géophysiques à partir de mesures des caractéristiques électromagnétiques des formations géologiques au voisinage du puits, soit pendant le forage, soit après le forage du puits. L'organe d'instrumentation de fond de puits comporte un ou plusieurs émetteurs et une pluralité de récepteurs espacés axialement le long d'un sous-ensemble de fond de puits, ledit organe d'instrumentation étant descendu en fond de puits au moyen d'une tige de forage. Pour éliminer les effets indésirables imputables aux variations d'impédance et au couplage inter-éléments des antennes réceptrices, on a amélioré les circuits électroniques et les procédés de traitement des données, le traitement parallèle des données permettant de réduire au minimum la propagation des erreurs systématiques dans les paramètres clés calculés. La qualité des paramètres clés mesurés ou calculés fait également l'objet d'un contrôle.

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