Electromagnetic wave resistivity tool having tilted antenna

G - Physics – 01 – V

Patent

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Details

G01V 3/26 (2006.01) G01V 3/28 (2006.01) G01V 3/30 (2006.01) G01V 3/38 (2006.01)

Patent

CA 2359371

This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an antenna configuration in which a transmitter antenna (T1) and a receiver antenna (R1) are oriented in non-parallel planes such that the vertical resistivity and the relative dip angle are decoupled. Preferably, either the transmitter or the receiver is mounted in a conventional orientation in a first plane that is normal to the tool axis, and the other antenna is mounted in a second plane that is not parallel to the first plane. Although this invention is primarily intended for MWD or LWD applications, this invention is also applicable to wireline applications.

L'invention concerne un procédé fond de trou ainsi qu'un dispositif permettant de déterminer simultanément la résistivité horizontale, la résistivité verticale, ainsi que l'angle relatif d'inclinaison de formations terrestres anisotropes. L'invention concerne la mise au point d'un tel dispositif, consistant à utiliser un agencement d'antennes dans lequel une antenne émettrice (T1) et une antenne réceptrice (R1) sont orientées dans des plans non parallèles, de manière à découpler la résistivité verticale et l'angle relatif d'inclinaison. De préférence, on a monté, soit l'émetteur, soit le récepteur, en les orientant de manière classique dans un premier plan, perpendiculaire à l'axe de l'outil, et on a monté l'autre antenne dans un second plan qui n'est pas parallèle au premier. Bien que cette invention soit d'abord destinée à des applications de mesure pendant le forage ou de diagraphie pendant le forage, l'invention peut également s'employer dans des applications de câbles métalliques.

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