Method to determine self-calibrated circumferential cased...

Details Method to determine self-calibrated circumferential cased... Method to determine self-calibrated circumferential cased...

G - Physics

01

V

G01V 1/46 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2312480

A method and device are disclosed for determining the impedance of the cement bond between a borehole casing (140) and its wellbore (110). The invention uses a predicted resonance response as a baseline for determining from the observed resonance response the approximate impedance of the cement. Corrections are made to account for various defects in the casing normalizing the received resonance response.

L'invention porte sur un procédé et un dispositif permettant de mesurer l'impédance du joint de ciment situé entre un tubage (140) de forage et son puits (110). L'invention utilise une réponse en résonance prédite comme base de référence pour déterminer à partir de la réponse en résonance observée l'impédance approximative du ciment. On effectue des corrections tenant compte des différents défauts du tubage pour normaliser la réponse en résonance reçue.

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