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Design of an Acoustic Through-Casing Logging Tool.

Kai Zhang¹, Shengqing Li¹, Yuanda Su¹

¹School of Geosciences and Technology, China University of Petroleum, Qingdao 266555, China.

Sensors (Basel, Switzerland)

|November 11, 2022

Summary

A new acoustic logging tool uses dual transmitters to cancel casing waves, improving formation data acquisition in cased oil and gas wells. This innovation enhances through-casing logging reliability, especially in challenging conditions.

Keywords:

acoustic logging logging tool through-casing logging transducer excitation circuit transmitting transducer

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Area of Science:

Geophysics
Petroleum Engineering
Acoustic Technology

Background:

Well logging is crucial for characterizing underground formations in oil and gas exploration.
Cased-hole logging is vital in mature fields and for wells logged after casing due to borehole instability.
Acoustic through-casing logging faces challenges from casing wave interference, particularly with poor casing-formation bonding.

Purpose of the Study:

To develop and validate an acoustic logging tool capable of suppressing casing waves.
To improve the quality and reliability of formation data obtained through casing.
To enable commercial application of acoustic logging in cased wells.

Main Methods:

Design of a novel acoustic tool featuring dual-source transmitters to actively cancel casing waves.
Optimization of transducer spacing and development of a dual-source transmitting circuit with opposite polarity signals.
Field testing of the tool in cased exploration wells.

Main Results:

Successful suppression of approximately 90% of casing waves was achieved.
The dual-source transmitter design effectively canceled interfering casing wave amplitudes.
Demonstrated the capability to obtain trustworthy formation information in cased wells.

Conclusions:

The developed dual-source acoustic logging tool significantly mitigates casing wave interference.
This technology enhances the commercial viability of through-casing acoustic logging.
Reliable formation evaluation is now possible even in wells with challenging casing-formation interfaces.