An image focusing method and apparatus for wellbore...

G - Physics – 01 – V

Patent

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G01V 3/20 (2006.01)

Patent

CA 2397115

An apparatus for obtaining resistivity images of a borehole includes an array of measure electrodes separated from a pad or the body of the instrument by a guard electrode. The guard electrode is maintained at a slightly lower potential than the pad and the measure electrode is at an intermediate potential thereto. With this arrangement, the current from the guard electrode defocuses the measure current from the measure electrode as it enters the formation, and at greater distances, the current from the measure electrode is refocused by the effect of the current from the pad. This defocusing and refocusing defines a region of investigation away from the borehole wall that is relatively insensitive to borehole rugosity. Circumferential and vertical overlap may be obtained either by the arrangement of the measure electrodes, or by relying on the broadening of the measure beam as it enters the formation.

L'invention concerne un dispositif permettant d'obtenir des images de résistivité d'un trou de sonde, qui comprend un réseau d'électrodes de mesure séparées d'une plaque ou du corps de l'instrument par une électrode de garde. L'électrode de garde est maintenue à un potentiel légèrement inférieur à celui de la plaque, et l'électrode de mesure présente un potentiel intermédiaire. Ce dispositif permet au courant provenant de l'électrode de garde de défocaliser le courant de mesure provenant de l'électrode de mesure lorsqu'il pénètre dans la formation, et, à de plus grandes distances, le courant provenant de l'électrode de mesure est refocalisé grâce au courant provenant de la plaque. Ces focalisation et refocalisation définissent une région d'investigation éloignée de la paroi de trou de sonde, qui est relativement insensible à la rugosité. Un chevauchement circonférentiel et vertical peut être obtenu par un aménagement des électrodes de mesure, ou par un élargissement du faisceau de mesure lorsqu'il pénètre dans la formation.

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