Method for downhole logging

Details Method for downhole logging Method for downhole logging

G - Physics

01

V

G01V 3/26 (2006.01)

Patent

CA 2367010

A method and apparatus for measuring the properties such as permeability of the rock surrounding a borehole in which a directional seismic or sonic signal is generated downhole and propagated into the surrounding formation to generate an electrokinetic signal and the focus of the seismic signal is moved in three dimensions in the surrounding rock by physically moving the source or by having two seismic sources which generate oscillating seismic signals at different frequencies and the focus of the seismic signal is varied by wave interference or wave interaction.

L'invention concerne un procédé et un appareil pour mesurer des propriétés telles que la perméabilité de la roche environnant un trou de forage par la génération à l'intérieur du trou de forage d'un signal sismique ou sonique dirigé qui se propage dans la formation environnante où il génère un signal électrocinétique. La focalisation du signal sismique est déplacée en trois dimensions dans la roche environnante par le déplacement physique de la source ou par l'utilisation de deux sources sismiques qui génèrent des signaux sismiques à des fréquences différentes, la focalisation du signal sismique étant modifiée par l'interférence ou par l'interaction des ondes.

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