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US 8,786,287 B2Granted
Collocated tri-axial induction sensors with segmented horizontal coils
AssigneeBaker Hughes Incorporated
InventorsLeonty A. Tabarovsky, Yuliy A. Dashevsky, Sergey V. Polozov
Life of this patent
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Abstract
A logging tool for use in a borehole to obtain multicomponent resistivity induction measurements using collocated coils wherein each of the transverse antennas comprises a pair of mirror-image coils symmetrically disposed about an axis of the logging tool.
Claims23
An apparatus for estimating a value of a resistivity property of an earth formation, the apparatus comprising:
- a first antenna arrangement on a logging tool configured to be conveyed in a borehole, the first antenna arrangement including a first antenna and a second antenna disposed on opposite sides of the logging tool, the second antenna electrically coupled to the first antenna to suppress a first signal in the first antenna caused by an axially flowing current in a conductor inside the tool;
- and
- a processor configured to estimate the value of the resistivity property of the earth formation using a second signal in the first antenna and the second antenna responsive to an external magnetic field.
A method of estimating a value of a resistivity property of an earth formation, the method comprising:
- conveying a logging tool into a borehole;
- using a first antenna arrangement on the logging tool including a first antenna and a second antenna on a side of the logging tool opposite to the first antenna, the second antenna electrically coupled to the first antenna for producing an output responsive to a first signal from an external magnetic field and suppressing a second signal in the first antenna caused by an axially flowing current in a conductor inside the tool;
- and
- using a processor for estimating the value of the resistivity property of the earth formation using the produced output of the antenna arrangement.
1 more element
Dependencies are inferred from the claim text.