Acoustic logging tool utilizing fundamental resonance
AssigneeHalliburton Energy Services, Inc.
InventorsChung Chang, Chen Li
Life of this patent
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Abstract
An acoustic logging tool includes a first acoustic transducer and a second acoustic transducer. At least a portion of the first transducer is parallel with the second transducer. The first and second acoustic transducers are configured to propagate an acoustic signal in the same direction. The first acoustic transducer is configured to generate an acoustic output having a different frequency than the second acoustic transducer.
Claims23
An acoustic logging tool, comprising:
- a support structure configured to be disposed in a housing for use within a wellbore;
- a first acoustic transducer and a second acoustic transducer coupled to the support structure,
- wherein at least a portion of the first transducer is parallel with the second transducer, and the first acoustic transducer and the second acoustic transducer are coupled only at a first end to a first end-piece and at a second end to a second end-piece, wherein the first end-piece and the second end-piece are located at different longitudinal positions along the support structure;
- wherein the first and second acoustic transducers are configured to propagate an acoustic signal in a propagation direction perpendicular to the support structure into a target formation region;
- and
- wherein the first acoustic transducer is configured to generate an acoustic output having a different frequency than the second acoustic transducer.
A method of performing acoustic logging from an acoustic logging tool within a wellbore, comprising:
- emitting a first acoustic wave from a first acoustic transducer, the first acoustic wave propagating in a first direction perpendicular to the acoustic logging tool at a first frequency into a target formation region;
- and
- emitting a second acoustic wave from a second acoustic transducer, the first acoustic wave propagating in the first direction at a second frequency into the target formation region, wherein the second frequency is different from the first frequency;
- wherein the first acoustic transducer and the second acoustic transducer are coupled only at a first end to a first end-piece and at a second end to a second end-piece, and the first end-piece and the second end-piece are located at different longitudinal positions along the support structure.
An acoustic transducer assembly configured to be disposed within a support structure for use within a wellbore, comprising:
- a first acoustic transducer and a second acoustic transducer, each of the first and second acoustic transducers comprising:
- a substrate comprising a first end, a second end, a first side, and a second side;
- a first piezoelectric element coupled to the first side;
- and
- a second piezoelectric element coupled to the second side;
- wherein the first ends of the first and second acoustic transducers are fixed together at a first end-piece and the second ends of the first and second acoustic transducers are fixed together at a second end-piece and the first end-piece and the second end-piece are located at different longitudinal positions along the support structure;
- wherein the first and second acoustic transducers are configured to generate acoustic signals that propagate in a propagation direction perpendicular to the support structure into a target formation region downhole within the wellbore;
- and
- wherein the first acoustic transducer is configured to generate an acoustic output having a different frequency than the second acoustic transducer.
Dependencies are inferred from the claim text.