IMAGING OF WELLBORE PIPES USING DEEP AZIMUTHAL ANTENNAS

摘要

A pipe inspection tool includes a body having a central axis, and one or more azimuthal antenna arrays operatively coupled to the body. Each azimuthal antenna array includes a plurality of antenna coils arranged circumferentially about the central axis and comprising an azimuthal array of z-coils or an azimuthal array of separated x-coils and separated y-coils. The separated x-coils are oriented in a first direction with respect to the central axis, the separated y-coils are oriented in a second direction with respect to the central axis, and the z-coils are oriented in a third direction with respect to the central axis. The second direction is orthogonal to the first direction, and the third direction is orthogonal to both the first and second directions.

主权项

1. A pipe inspection tool, comprising:
a body having a central axis; and one or more azimuthal antenna arrays operatively coupled to the body, each azimuthal antenna array including a plurality of antenna coils arranged circumferentially about the central axis and comprising at least one of an azimuthal array of z-coils, an azimuthal array of separated x-coils, and an azimuthal array of separated y-coils, wherein the separated x-coils are oriented in a first direction with respect to the central axis, the separated y-coils are oriented in a second direction with respect to the central axis, and the z-coils are oriented in a third direction with respect to the central axis, and wherein the second direction is orthogonal to the first direction, and the third direction is orthogonal to both the first and second directions.