Air layer for improved performance of transducer at low frequencies
AssigneeHalliburton Energy Services, Inc.
InventorsJing Jin, Ruijia Wang, Xiang Wu
Life of this patent
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Abstract
A Transducer in a downhole environment with an increased amplitude of the transducer output at lower frequencies. A transducer may include a bender bar, wherein the bender bar may include a first piezoelectric layer disposed on one surface of the bender bar, a second piezoelectric layer disposed on the opposite surface of the bender bar, and a metallic substrate disposed between the first piezoelectric layer and the second piezoelectric layer. The transducer may further include a first fixed end is attached to the bender bar and connects the bender bar to a base, a second fixed end opposite the first fixed end that attaches the bender bar to the base, and a compartment disposed within the base.
Claims20
A transducer comprising:
- a bender bar comprising:
- a first piezoelectric layer disposed on a first surface of the bender bar;
- a second piezoelectric layer disposed on a second surface of the bender bar;
- and
- a metallic, substrate disposed between the first piezoelectric layer and the second piezoelectric layer;
- a base;
- a compartment disposed in the base,
- wherein the compartment is enclosed within the base, and
- wherein the compartment comprises a vacuum or a gas;
- a first fixed end attached to the bender bar and the base;
- and
- a second fixed end, opposite the first fixed end, attached to the bender bar and the base.
A method comprising:
- disposing a transducer downhole on a measurement assembly, wherein the transducer comprises:
- a bender bar comprising:
- a first piezoelectric layer disposed on a first surface of the bender bar;
- a second piezoelectric layer disposed on a second surface of the bender bar;
- and
- a metallic substrate disposed between the first piezoelectric layer and the second piezoelectric layer;
- a base;
- a compartment disposed in the base,
- wherein the compartment is enclosed within the base, and
- wherein the compartment comprises a vacuum or a gas;
- a first fixed end attached to the bender bar and the base;
- and
- a second fixed end, opposite the first fixed end, attached to the bender bar and the base;
- and
- electrifying the first piezoelectric layer and the second piezoelectric layer to create one or more pressure pulses that include a plurality of investigation pressure pulses and a plurality of rear pressure pulses, wherein the plurality of rear pressure pulses reflect off the compartment and merge with the plurality of investigation pressure pulses to increase an amplitude of at least one of the plurality of investigation pressure pulses.
Dependencies are inferred from the claim text.