Electromagnetic wave resistivity tool with tilted antenna

G - Physics – 01 – V

Patent

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Details

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

Patent

CA 2415563

A downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations uses an antenna configuration in which a transmitter antenna (T1-TN) and a receiver antenna (R1, R2) 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. Also disclosed is a method and apparatus for steering a downhole tool during a drilling operation in order to maintain the borehole within a desired earth formation. The steering capability is enabled by computing the difference or the radio of the phase-based or amplitude-based responses of the receiver antennas (R1, R2) which are mounted in planes that are not parallel to the planes of the transmitter antennas (T1-TN).

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, qui consiste à utiliser un agencement d'antennes dans lequel une antenne émettrice (T1-TN) et une antenne réceptrice (R1, R2) 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 l'autre antenne dans un second plan qui n'est pas parallèle au premier. L'invention concerne également un procédé et un dispositif de guidage de l'outil fond de trou pendant un forage afin de maintenir le trou de sonde dans la formation terrestre voulue. Cette capacité de guidage s'appuie sur le calcul de la différence ou du rapport des réponses fondées sur la phase ou sur l'amplitude des antennes réceptrices (R1, R2) montées dans des plans qui ne sont pas parallèles à ceux des antennes émettrices (T1, TN).

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