Reconstruction of Hydraulic Fractures Using Passive Ultrasonic Travel-Time Tomography

Zhu, Wei; Chang, Xu; Wang, Yibo; Zhai, Hongchen; Yao, Zhaohui

doi:10.3390/en11051321

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…To enhance electrode-sample coupling, a damp dough was applied at the contact points between each electrode and the specimen. Figure 11b reveals the presence of a noticeable crack in the physical specimen [37]. The system is capable of simultaneous acquisition of multiple electrical parameters, enabling the inversion processing of various parameters to fully reflect the electrical characteristics of the rock samples.…”

Section: Model Testmentioning

confidence: 99%

Design of Three-Dimensional Electrical Impedance Tomography System for Rock Samples

Peng,

Chun,

et al. 2024

Applied Sciences

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Research on the electrical properties of rocks and ores plays a crucial role in the development of geophysical electromagnetism methods. However, currently available instruments suffer from high power consumption, a limited number of electrodes, inaccurate measurements, poor portability, and a limited ability to measure the electrical parameters of rocks and ores. To address these issues, this paper presents a three-dimensional electrical impedance tomography system for rock samples with high-density microelectrodes based on an Android system and STM32 microcontroller. The system features high observation accuracy, dense electrode arrays (with 384 current and potential electrodes), flexible electrode selection, user-friendly human–computer interaction, good stability, and real-time performance. Powered by a single power bank, the entire instrument can be controlled and monitored wirelessly via Bluetooth and Wi-Fi technology using an Android smartphone. Additionally, the system not only enables accurate measurement of electrical parameters, but also facilitates the generation of three-dimensional impedance imaging of specimens via inversion algorithms after data export, allowing for a comprehensive understanding of the electrical properties of rocks and ores. This system holds great potential for future research in this field.

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Section: Model Testmentioning

confidence: 99%

Design of Three-Dimensional Electrical Impedance Tomography System for Rock Samples

Peng,

Chun,

et al. 2024

Applied Sciences

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“…Since this method adopts the sparse regularization term, we call this method sparse tomography. The work in [57] proved that this method can be used to reconstruct hydraulic fracturing fractures, so we used this method to obtain the 3D ultrasonic velocity imaging in the sample.…”

Section: Sparse Tomographymentioning

confidence: 99%

Three-Dimensional Ultrasonic Imaging and Acoustic Emission Monitoring of Hydraulic Fractures in Tight Sandstone

et al. 2021

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Hydraulic fracturing is an important means for the development of tight oil and gas reservoirs. Laboratory rock mechanics experiments can be used to better understand the mechanism of hydraulic fracture. Therefore, in this study we carried out hydraulic fracturing experiments on Triassic Yanchang Formation tight sandstone from the Ordos Basin, China. Sparse tomography was used to obtain ultrasonic velocity images of the sample during hydraulic fracturing. Then, combining the changes in rock mechanics parameters, acoustic emission activities, and their spatial position, we analyzed the hydraulic fracturing process of tight sandstone under high differential stress in detail. The experimental results illuminate the fracture evolution processes of hydraulic fracturing. The competition between stress-induced dilatancy and fluid flow was observed during water injection. Moreover, the results prove that the “seismic pump” mode occurs in the dry region, while the “dilation hardening” and “seismic pump” modes occur simultaneously in the partially saturated region; that is to say, the hydraulic conditions dominate the failure mode of the rock.

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“…This section introduces the priori model for the target object. The priori model is the 3D reconstruction (stored in the form of the point cloud [16][17][18]) of the target object in its stationary status, with a SIFT feature vector attached to each cloud point. Therefore, the priori model is built through two steps.…”

Section: D Labeled Reconstructionmentioning

confidence: 99%

Depth Estimation of a Deformable Object via a Monocular Camera

Jiang

Jin

et al. 2019

Applied Sciences

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The depth estimation of the 3D deformable object has become increasingly crucial to various intelligent applications. In this paper, we propose a feature-based approach for accurate depth estimation of a deformable 3D object with a single camera, which reduces the problem of depth estimation to a pose estimation problem. The proposed method needs to reconstruct the target object at the very beginning. With the 3D reconstruction as an a priori model, only one monocular image is required afterwards to estimate the target object’s depth accurately, regardless of pose changes or deformability of the object. Experiments are taken on an NAO robot and a human to evaluate the depth estimation accuracy by the proposed method.

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Reconstruction of Hydraulic Fractures Using Passive Ultrasonic Travel-Time Tomography

Cited by 9 publications

References 25 publications

Design of Three-Dimensional Electrical Impedance Tomography System for Rock Samples

Design of Three-Dimensional Electrical Impedance Tomography System for Rock Samples

Three-Dimensional Ultrasonic Imaging and Acoustic Emission Monitoring of Hydraulic Fractures in Tight Sandstone

Depth Estimation of a Deformable Object via a Monocular Camera

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