Measurement of nonlinear formation parameters using sonic...

G - Physics – 01 – V

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G01V 1/40 (2006.01) G01V 1/44 (2006.01)

Patent

CA 2158156

Methods and apparatus are provided for determining an indication of a nonlinear property of the formation. A sonic tool is used in a borehole to generate a signal having multiple cycles of a wave of a predetermined frequency. The amplitude of a tube wave resulting from the signal is measured. The measured amplitude is then used to determine an indication of the nonlinearity of the formation according to a relationship which relates the measured amplitude to the amplitude of a second harmonic tube wave which is generated in the borehole by the tube wave of the predetermined frequency due to the nonlinear property of the formation. The indication of nonlinearity may then be utilized to give an indication of the relative consolidation of the formation surrounding the borehole.

Procédés et appareils permettant d'obtenir une indication d'une caractéristique non linéaire d'une formation. Un outil acoustique est utilisé dans un trou de sondage pour générer un signal présentant une onde d'une fréquence prédéterminée et à plusieurs cycles. L'amplitude d'une onde tubulaire associée au signal est mesurée. L'amplitude mesurée est alors utilisée pour obtenir une indication de la non-linéarité de la formation en fonction d'un rapport qui associe l'amplitude mesurée et l'amplitude d'une onde tubulaire de deuxième harmonique générée dans le trou de sondage par l'onde tubulaire de fréquence prédéterminée en raison de la caractéristique non linéaire de la formation. L'indication de non-linéarité peut alors être utilisée pour fournir une indication de la consolidation relative de la formation entourant le trou de sondage.

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