Electromagnetic logging while drilling tool

摘要

A deep reading electromagnetic logging while drilling tool includes first and second logging while drilling subs, the first of which includes a first transmitter and a first receiver axially spaced apart from one another and the second of which includes a second transmitter and a second receiver axially spaced apart from one another. Each of the first and second transmitters and first and second receivers includes an axial antenna and collocated first and second transverse antennas. The first and second transverse antennas in the first receiver are rotationally offset by a predefined angle from the first and second transverse antennas in the first transmitter.

主权项

1. An electromagnetic logging while drilling tool comprising:
first and second logging while drilling subs, the first sub including a first transmitter and a first receiver axially spaced apart from one another; the second sub including a second transmitter and a second receiver axially spaced apart from one another; each of the first and second transmitters and first and second receivers including an axial antenna and collocated first and second transverse antennas; and the first and second transverse antennas in the first receiver being rotationally offset by a predefined angle from the first and second transverse antennas in the first transmitter wherein the first and second subs are rotationally offset from one another by an arbitrary angle such that the first and second transverse antennas in the second transmitter are rotationally offset from the first and second transverse antennas in the first transmitter.