# US 2017/0285205 A1 · Acoustic Logging Tool Utilizing Fundamental Resonance

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- Number: US 2017/0285205 A1
- Document ID: US20170285205A1
- Status: Published application
- Kind: A1
- Application number: 15/317,071
- Filed: 2015-10-06
- Published: 2017-10-05
- Earliest claimed: 2015-10-06
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Halliburton Energy Services, Inc.
- Inventors: Jing Jin; Chung Chang
- Web page: https://patentgrep.com/patent/US20170285205A1

## CPC

- G01V 1/44: using generators and receivers in the same well (G01V1/52 takes precedence)
- G01V 1/159: {using piezoelectric or magnetostrictive driving means (generating mechanical vibrations by using piezoelectric or magnetostrictive effect in general, B06B1/06, B06B1/08)}
- G01V 1/18: Receiving elements, e.g. seismometer, geophone {or torque detectors, for localised single point measurements}
- G01V 1/52: Structural details
- G01V 2210/1299: Subsurface, e.g. in borehole or below weathering layer or mud line
- G01V 2210/1429: Subsurface, e.g. in borehole or below weathering layer or mud line
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)

## Abstract

An acoustic logging tool includes a support structure and a set of acoustic transducers coupled to the support structure. The set of acoustic transducers includes a first acoustic transducer and a second acoustic transducer facing the same direction. Each of the first and second acoustic transducers includes a substrate having a first end, a second end, a first side, and a second side. Each acoustic transduce further includes a first piezoelectric element coupled to the first side of the substrate and a second piezoelectric element coupled to the second side of the substrate. The first and second ends of the substrate extend beyond the first and second piezoelectric elements and are fixed to the support structure.

## Claims

### Claim 1

An acoustic logging tool, comprising:
a support structure; and
a set of acoustic transducers coupled to the support structure, the set of acoustic transducers comprising a first acoustic transducer and a second acoustic transducer facing the same direction,
wherein each of the first and second acoustic transducers comprises:
a substrate having 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 and second ends of the substrate extend beyond the first and second piezoelectric elements and are fixed to the support structure.

### Claim 2 (depends on 1)

The acoustic logging tool of claim 1, wherein the substrate of the first acoustic transducer and the substrate of the second acoustic transducer are integral and continuous.

### Claim 3 (depends on 2)

The acoustic logging tool of claim 2, wherein:
the second end of the substrate of the first acoustic transducer is integrally coupled to the first end of the substrate of the second acoustic transducer, forming a substrate joint portion; and
the first end of the substrate of the first acoustic transducer and the second end of the substrate of the second acoustic transducer are on opposite sides of the substrate joint portion.

### Claim 4 (depends on 3)

The acoustic logging tool of claim 3, wherein the substrate joint portion is fixed to the support structure.

### Claim 5 (depends on 1)

The acoustic logging tool of claim 1, wherein the first acoustic transducer and the second acoustic transducer are longitudinally aligned.

### Claim 6 (depends on 1)

The acoustic logging tool of claim 1, wherein the first acoustic transducer is longer than the second acoustic transducer.

### Claim 7 (depends on 1)

The acoustic logging tool of claim 1, wherein the substrate of the first acoustic transducer is thicker than the substrate of the second acoustic transducer.

### Claim 8 (depends on 1)

The acoustic logging tool of claim 1, comprising a flowbore formed therethrough.

### Claim 9 (depends on 1)

The acoustic logging tool of claim 1, comprising a plurality of sets of acoustic transducers, each of the plurality of sets of acoustic transducers facing a different direction.

### Claim 10

An acoustic logging tool, comprising:
a support structure; and
a dual acoustic transducer comprising:
a substrate comprising a first side, a second side, a first end, a second end, and a mid-portion between the first end and the second end, wherein the first end, second end, and mid-portion are fixed to the support structure;
a first piezoelectric element coupled to the first side of the substrate between the first end and the mid-portion;
a second piezoelectric element coupled to the second side of the substrate between the first end and the mid-portion;
a third piezoelectric element coupled to the first side of the substrate between the mid-portion and the second end; and
a fourth piezoelectric element coupled to the second side of the substrate between the mid-portion and the second end.

### Claim 11 (depends on 10)

The acoustic logging tool of claim 10, wherein the first and second piezoelectric elements are the same size and aligned with each other, and the third and fourth piezoelectric elements are the same size and aligned with each other.

### Claim 12 (depends on 10)

The acoustic logging tool of claim 10, wherein vibration of the substrate due to the first and second piezoelectric elements is isolated between the first end and the mid-portion, and vibration of the substrate due to the second and third piezoelectric elements is isolated between the third and fourth piezoelectric elements is isolated between the mid-portion and the second end.

### Claim 13 (depends on 10)

The acoustic logging tool of claim 10, wherein the distance between the first end and the mid-portion is longer than the distance between the mid-portion and the second end.

### Claim 14 (depends on 11)

The acoustic logging tool of claim 11, wherein the first and second piezoelectric elements are larger than the third and fourth piezoelectric elements by up to 40%.

### Claim 15 (depends on 10)

The acoustic logging tool of claim 10, further comprising co-located X and Y dipoles.

### Claim 16

A method of performing acoustic logging, comprising:
energizing a first acoustic transducer;
energizing a second acoustic transducer, wherein each of the first and second acoustic transducers comprise a substrate, a first piezoelectric element coupled to a first side of the substrate, and a second piezoelectric element coupled to a second side of the substrate;
emitting a first acoustic signal from the first acoustic transducer; and
emitting a second acoustic signal from the second acoustic transducer in the same direction as the first acoustic signal.

### Claim 17 (depends on 16)

The method of claim 16, where the first acoustic signal and second acoustic signal have frequencies within 2 kHz of each other.

### Claim 18 (depends on 16)

The method of claim 16, wherein the first acoustic transducer and the second acoustic transducer are formed on different portions of a single substrate.

### Claim 19 (depends on 16)

The method of claim 16, wherein the first acoustic transducer is longitudinally aligned with the second acoustic transducer.

### Claim 20 (depends on 16)

The method of claim 16, comprising applying the same voltage to the first and second acoustic transducers.