E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/12 (2006.01) G01V 1/48 (2006.01)
Patent
CA 2447245
A method for determining formation shear slowness of formations surrounding an earth borehole that includes: transmitting sonic energy into the formations from a dipole source in the borehole; measuring signals from orthogonal wave components that have traveled through the formations at each of a plurality of receiver locations in the borehole, spaced at a respective plurality of distances from the transmitter location; transforming the signals to the frequency domain and separating dispersive and non- dispersive portions of the transformed signals; and determining fast and slow shear slowness of the formation from the low frequency asymptotes of the dispersive portions of the transformed signals. Related methods for determining shear directionality and the magnitude of anisotropy of anisotropic formations surrounding an earth borehole and associated apparatus are also described.
Divulgation d'une méthode pour déterminer la lenteur du cisaillement de formations entourant un puits de forage dans la terre. Cette méthode comprend : la transmission de l'énergie sonique aux formations à partir d'une source de dipôle dans le puits de forage; la mesure des signaux des éléments d'onde orthogonaux qui ont traversés la formation à plusieurs endroits de réception dans le puits, endroits respectivement espacés à plusieurs distances du dispositif de transmission; la transformation des signaux dans le domaine de fréquences et la séparation des parties dispersives et non dispersives des signaux transformés; la détermination de la lenteur de cisaillement de la formation, lente et rapide, à partir des asymptotes de faible fréquence des parties dispersives des signaux transformés. On divulgue aussi des méthodes connexes pour déterminer la direction du cisaillement et l'ampleur de l'anisotropie des formations anisotropes entourant un puits de forage, et l'appareillage connexe.
Bose Sandip
Huang Xiaojun
Sinha Bikash K.
Schlumberger Canada Limited
Smart & Biggar
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