Methods of deep azimuthal inspection of wellbore pipes

摘要

Methods including conveying a pipe inspection tool into a wellbore having at least a first pipe positioned within a second pipe, the pipe inspection tool including an electromagnetic sensor. A first excitation signal is transmitted from a first x-coil of the electromagnetic sensor, and a first response signal derived from the first excitation signal is received at the first x-coil or a second x-coil of the electromagnetic sensor. A second excitation signal is then transmitted from a first y-coil of the electromagnetic sensor, and a second response signal derived from the second excitation signal is received at the first y-coil or a second y-coil of the electromagnetic sensor. The first and second response signals are then compared to determine an azimuthal characteristic of the second pipe.

主权项

1. 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 an electromagnetic sensor; transmitting a first excitation signal from a first x-coil of the electromagnetic sensor; receiving and measuring a first response signal derived from the first excitation signal at the first x-coil or a second x-coil of the electromagnetic sensor; transmitting a second excitation signal from a first y-coil of the electromagnetic sensor; receiving and measuring a second response signal derived from the first second excitation signal at the first y-coil or a second y-coil of the electromagnetic sensor; and processing the first and second response signals to determine at least one azimuthal characteristic of the second pipe, wherein the first x-coil and the first y-coil comprise a first antenna and the second x-coil and the second y-coil comprise a second antenna, and wherein the first and second antennas are collocated.