Permittivity measurements with oil-based mud imaging tool

Details Permittivity measurements with oil-based mud imaging tool Permittivity measurements with oil-based mud imaging tool

G - Physics

01

V

G01V 3/00 (2006.01)

Patent

CA 2618735

Oil-based mud imaging systems and methods that measure formation permittivity. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the voltage electrodes to determine a differential voltage magnitude and phase. From the magnitude and phase, formation resistivity and permittivity measurements can be determined and used to construct a borehole wall image.

L'invention concerne des systèmes et des procédés de mise en image de boue à base d'huiles qui mesurent la permittivité de formation. Dans certains modes de réalisation, les systèmes d'enregistrement comprennent un outil d'enregistrement qui communique avec des installations informatiques de surface. L'outil d'enregistrement est muni d'un réseau de capteurs ayant au moins deux électrodes de tension disposées entre au moins deux électrodes de courant qui créent un champ électrique dans une paroi de trou de sonde et de matériel électronique couplé aux électrodes de tension afin de déterminer la magnitude et la phase de la tension différentielle. Les mesures de la résistivité et la permittivité de formation peuvent être déterminées à partir de la magnitude et de la phase et utilisées pour construire une image de paroi de trou de sonde.

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