Borehole Acoustic Imaging Using 3D STC and Ray Tracing to Determine Far-Field Reflector Dip and Azimuth

Bennett, Nicholas; Donald, Adam; Ghadiry, Sherif; Nassar, Mamdouh I.; Kumar, Rajeev; Biswas, Reetam Sen

doi:10.30632/pjv60n2-2019a10

Cited by 14 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, despite the fact that this method has good response sensitivity and occupies less hardware resources, it is sensitive to noise and also works poorly with data that have a low signal-to-noise ratio (SNR). The second type uses the overall waveform recording form, such as the cross-correlation method of adjacent waveforms, the autoregressive arrival detection method and the AIC algorithm based on statistical laws [15][16][17]. This method has a certain anti-noise ability, but the processing result is poor when dealing with complex waveform recording forms.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Method and Implementation of Head-Wave Extraction for Ultrasonic Imaging While Drilling

Zhang,

Lu,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Extracting head waves and subsequently uploading their results from the downhole to the surface system in real time could improve the real-time guidance of ultrasonic imaging logging while drilling (UILWD) for drilling operations. To realize the downhole real-time extraction of head waves in this logging, three aspects were explored in this study. First, an improved energy ratio head-wave arrival extraction algorithm based on the weighting coefficients and characteristic functions, along with an amplitude detection method relying on peak-to-peak values, was proposed. Second, an echo reception pre-processing analog circuit and a digital signal processing circuit based on FPGA were designed. A pipeline algorithm was developed in FPGA to extract the arrival time and amplitude of the head wave. Finally, software simulations, laboratory tests, and field experiments related to this method were conducted. Our results showed that the real-time head-wave extraction method demonstrated a strong anti-noise ability in real time. The maximum relative error of the arrival time was less than 5%. The relative error of the amplitude was acceptable, and 90% of this value was within 5%. Through the measurement, the time of processing a single-channel waveform by a downhole algorithm was less than 15 ms, thus meeting the requirements for the real-time processing of downholes.

show abstract

Section: Introductionmentioning

confidence: 99%

Real-Time Method and Implementation of Head-Wave Extraction for Ultrasonic Imaging While Drilling

Zhang,

Lu,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The installation of multiple piezoelectric vibrators in the circumferential direction is necessary to realize the downhole azimuthal measurement [ 22 , 23 , 24 ]. The energy, frequency response, and azimuthal resolution of piezoelectric vibrators have a considerable effect on the measurement results.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Azimuthal-Transmitting Transducer of Acoustic Logging

Men

Che

2023

Sensors

View full text Add to dashboard Cite

Azimuthal acoustic logging can survey the downhole formation more accurately, and the acoustic source is the crucial component of the downhole acoustic logging tool with azimuthal resolution characteristics. To realize downhole azimuthal detection, assembling multiple transmitting piezoelectric vibrators in the circumferential direction is necessary, and the performance of azimuthal-transmitting piezoelectric vibrators needs attention. However, effective heating test and matching methods are not yet developed for downhole multi-azimuth transmitting transducers. Therefore, this paper proposes an experimental method to comprehensively evaluate downhole azimuthal transmitters; furthermore, we analyze the azimuthal-transmitting piezoelectric vibrator parameters. This paper presents a heating test apparatus and studies the admittance and driving responses of the vibrator at different temperatures. The transmitting piezoelectric vibrators showing a good consistency in the heating test were selected, and an underwater acoustic experiment was performed. The main lobe angle of the radiation beam, horizontal directivity, and radiation energy of the azimuthal vibrators and azimuthal subarray are measured. The peak-to-peak amplitude radiated from the azimuthal vibrator and the static capacitance increase with an increase in temperature. The resonant frequency first increases and then decreases slightly with an increase in temperature. After cooling to room temperature, the parameters of the vibrator are consistent with those before heating. Hence, this experimental study can provide a foundation for the design and matching selection of azimuthal-transmitting piezoelectric vibrators.

show abstract

“…It can fill the gap between the shallow detection of conventional acoustic logging and the low resolution of seismic exploration. This logging method has the obvious advantage of describing the lateral inhomogeneity in carbonate reservoirs, the attitudes and distributions of fractures, and small geological structures near boreholes [ 1 , 2 ]. Therefore, it has been widely used in the identification and fine description of unconventional reservoirs and in the optimization of drilling trajectories [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

A Plasma Transmitting Source for Borehole Acoustic Reflection Imaging

Hao

Zhou

Shang

et al. 2022

Sensors

View full text Add to dashboard Cite

The detection depth of current borehole acoustic reflection imaging is only tens of meters without high resolution. This considerably limits its wide application in the identification and fine description of unconventional reservoirs and in the optimization of drilling trajectories. Increasing the directional energy from the transmitter to a geological structure is an excellent way to solve this issue. In this study, a plasma source with a parabolic reflector was introduced during borehole acoustic reflection imaging. First, an experimental system was built for testing the plasma source. Next, the acoustic-electrical characteristics and directional radiation of the source were studied using experiments and a numerical simulation. Finally, the advantages, disadvantages, and feasibility of the plasma-transmitting source were analyzed; some suggestions for further work on the source and its logging application were proposed. The experimental and simulation results show that the use of a plasma source with a parabolic reflector can increase the detection depth of borehole acoustic reflection imaging to hundreds of meters with high resolution. This is crucial in imaging the geological structures near boreholes and enhancing oil–gas exploration and development.

show abstract

Borehole Acoustic Imaging Using 3D STC and Ray Tracing to Determine Far-Field Reflector Dip and Azimuth

Cited by 14 publications

References 0 publications

Real-Time Method and Implementation of Head-Wave Extraction for Ultrasonic Imaging While Drilling

Real-Time Method and Implementation of Head-Wave Extraction for Ultrasonic Imaging While Drilling

Experimental Study on the Azimuthal-Transmitting Transducer of Acoustic Logging

A Plasma Transmitting Source for Borehole Acoustic Reflection Imaging

Contact Info

Product

Resources

About