Imaging of wellbore pipes using deep azimuthal antennas
First Claim
1. A pipe inspection tool, comprising:
- a body having a central axis; and
a plurality of azimuthal antenna arrays operatively coupled to the body, each azimuthal antenna array including a plurality of antenna coils arranged circumferentially about the central axis, the plurality of azimuthal antenna arrays comprising an azimuthal array of z-coils, an azimuthal array of separated x-coils, and an azimuthal array of separated y-coils,wherein the plurality of antenna coils of the azimuthal array of separated x-coils are oriented in a first direction with respect to the central axis, the plurality of antenna coils of the azimuthal array of separated y-coils are oriented in a second direction with respect to the central axis, and the plurality of antenna coils of the azimuthal array of 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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
19 Citations
20 Claims
-
1. A pipe inspection tool, comprising:
-
a body having a central axis; and a plurality of azimuthal antenna arrays operatively coupled to the body, each azimuthal antenna array including a plurality of antenna coils arranged circumferentially about the central axis, the plurality of azimuthal antenna arrays comprising an azimuthal array of z-coils, an azimuthal array of separated x-coils, and an azimuthal array of separated y-coils, wherein the plurality of antenna coils of the azimuthal array of separated x-coils are oriented in a first direction with respect to the central axis, the plurality of antenna coils of the azimuthal array of separated y-coils are oriented in a second direction with respect to the central axis, and the plurality of antenna coils of the azimuthal array of 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. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method, comprising:
-
conveying a pipe inspection tool into a wellbore having at least a first pipe positioned within a second pipe, the pipe inspection tool including a plurality of azimuthal antenna arrays including an azimuthal array of separated x-coils and an azimuthal array of separated y-coils; transmitting an excitation signal from a transmitter antenna of the pipe inspection tool; measuring a first response signal derived from the excitation signal with one of the azimuthal antenna arrays at an axial position within the wellbore and at a first azimuth; measuring a second response signal with the one of the azimuthal antenna arrays at the axial position and at a second azimuth; and processing the first and second response signals to determine an azimuthal characteristic of the second pipe. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method, comprising:
-
conveying a pipe inspection tool into a wellbore having at least a first pipe positioned within a second pipe, the pipe inspection tool including a plurality of azimuthal antenna arrays including an azimuthal array of separated x-coils and an azimuthal array of separated y-coils; transmitting an excitation signal from a transmitter antenna of the pipe inspection tool; measuring a first shallow measurement derived from the excitation signal with a first azimuthal antenna array at a first axial position within the wellbore and at a first azimuth; measuring a second shallow measurement derived from the excitation signal with the first azimuthal antenna array at the first axial position and at a second azimuth; measuring a first deep measurement derived from the excitation signal with a second azimuthal antenna array at a second axial position and at a third azimuth; measuring a second deep measurement derived from the excitation signal with the second azimuthal antenna array at the second axial position and at a fourth azimuth; and processing the first and second shallow measurements and the first and second deep measurements to determine azimuthal characteristics of the first and second pipes. - View Dependent Claims (17, 18, 19, 20)
-
Specification