Azimuthal cement evaluation with an acoustic phased-arc array transmitter: numerical simulations and field tests

Che, Xiaohua; Qiao, Wenxiao; Ju, Xiaodong; Wang, Ruijia

doi:10.1007/s11770-016-0537-1

Cited by 10 publications

(3 citation statements)

References 14 publications

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“…The amplitude of the received signal in seismoelectric logging is small, so it is necessary to improve the intensity of transmitted signal using an appropriate technology. According to the literature [30][31][32][33][34][35], a phased array acoustic logging radiator can improve the radiated sound field, the signal-to-noise ratio of received signal and the detection depth. Therefore, a phased array radiator is also included into this instrument.…”

Section: Design Of Phased Array Radiatormentioning

confidence: 99%

Design of a New Seismoelectric Logging Instrument

Zhang

Lü

et al. 2021

Sensors

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To increase the accuracy of reservoir evaluation, a new type of seismoelectric logging instrument was designed. The designed tool comprises the invented sonde-structured array complex. The tool includes several modules, including a signal excitation module, data acquisition module, phased array transmitting module, impedance matching module and a main system control circuit, which are interconnected through high-speed tool bus to form a distributed architecture. UC/OS-II was used for the real-time system control. After constructing the experimental measurement system prototype of the seismoelectric logging detector, its performance was verified in the laboratory. The obtained results showed that the consistency between the multi-channel received waveform amplitude and benchmark spectrum was more than 97%. The binary phased linear array transmitting module of the instrument can realize 0° to 20° deflection and directional radiation. In the end, a field test was conducted to verify the tool’s performance in downhole conditions. The results of this test proved the effectiveness of the developed seismoelectric logging tool.

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Section: Design Of Phased Array Radiatormentioning

confidence: 99%

Design of a New Seismoelectric Logging Instrument

Zhang

Lü

et al. 2021

Sensors

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“…There are two ways to solve the problem. One strategy is to optimize the hardware, such as using composite materials to improve the sensitivity of the transducer and using a phased-arc array transmitter with azimuthal detection capability to improve the acquisition accuracy [ 43 , 44 ]. The other way is based on signal processing methods to improve the captured images.…”

Section: Introductionmentioning

confidence: 99%

A POSHE-Based Optimum Clip-Limit Contrast Enhancement Method for Ultrasonic Logging Images

Zhang

Celenk

et al. 2018

Sensors

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Enabled by piezoceramic transducers, ultrasonic logging images often suffer from low contrast and indistinct local details, which makes it difficult to analyze and interpret geologic features in the images. In this work, we propose a novel partially overlapped sub-block histogram-equalization (POSHE)-based optimum clip-limit contrast enhancement (POSHEOC) method to highlight the local details hidden in ultrasonic well logging images obtained through piezoceramic transducers. The proposed algorithm introduces the idea of contrast-limited enhancement to modify the cumulative distribution functions of the POSHE and build a new quality evaluation index considering the effects of the mean gradient and mean structural similarity. The new index is designed to obtain the optimal clip-limit value for histogram equalization of the sub-block. It makes the choice of the optimal clip-limit automatically according to the input image. Experimental results based on visual perceptual evaluation and quantitative measures demonstrate that the proposed method yields better quality in terms of enhancing the contrast, emphasizing the local details while preserving the brightness and restricting the excessive enhancement compared with the other seven histogram equalization-based techniques from the literature. This study provides a feasible and effective method to enhance ultrasonic logging images obtained through piezoceramic transducers and is significant for the interpretation of actual ultrasonic logging data.

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“…These methods can be classified as hardware-based and software-based. Hardware-based image denoising methods include those employing composite transducers [7], [8] and or phased arc array transmitters with azimuthal detection capability [9]. This method can improve the acquisition of transducers accuracy and the sensitivity.…”

mentioning

confidence: 99%

Ultrasonic Logging Image Denoising Based on CNN and Feature Attention

Wei

et al. 2021

IEEE Access

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Various kinds of noise will be produced during the process of ultrasonic logging in high temperature and high-pressure environment under oil wells, which is blurring the logging image. This paper presents a novel end-to-end denoising model (ULNet) based on CNN and feature attention to address this problem and remove the noise from ultrasonic logging images. Our method mainly includes feature attention, feature enhancement based on residual model and reconstruction for ultrasonic logging image. Feature enhancement based on a residual model integrates global and local features to increase the expressive ability of the denoising model. Feature attention is used to distinguish the channel feature weights, and effective for blind denoising of actual images. Kernel dilation and skip-connection is used to reduce the computational cost during training. The Noise mapping results are used to reconstruct a clean image. Comprehensive quantitative and qualitative evaluations of results for selected study datasets collected at six oil wells in China show that this model is a feasible and effective means for denoising ultrasonic logging images. Overall, ULNet shows potential for practical ultrasonic logging images denoising.INDEX TERMS Ultrasonic logging image denoising, CNN, feature attention, residual learning. I. INTRODUCTION

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Azimuthal cement evaluation with an acoustic phased-arc array transmitter: numerical simulations and field tests

Cited by 10 publications

References 14 publications

Design of a New Seismoelectric Logging Instrument

Design of a New Seismoelectric Logging Instrument

A POSHE-Based Optimum Clip-Limit Contrast Enhancement Method for Ultrasonic Logging Images

Ultrasonic Logging Image Denoising Based on CNN and Feature Attention

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