Acoustic emission monitoring of hydraulic fracturing using carbon dioxide in a small-scale field experiment

Ishida, Tsuyoshi; Desaki, Shuich; Kishimoto, Yoshinobu; Naoi, Makoto; Fujii, Hirokazu

doi:10.1016/j.ijrmms.2021.104712

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…These results indicates that HF propagation for TPR situations, with much lower viscosity fluids, will be much more affected by the areas of stress concentration and local heterogeneity relative to VPR. Ishida et al (2021) conducted a small-scale HF field experiment using CO 2 in a railroad tunnel in Japan. The fracture geometry was similar to what has been observed in the TPR experiments in this study, where fracture propagated more on one side of the injection hole relative to other.…”

Section: Determination Of Gutenberg-richter B-valuementioning

confidence: 99%

Microseismic monitoring of laboratory hydraulic fracturing experiments in granitic rocks for different fracture propagation regimes

Butt

Hedayat

Moradian

2022

Preprint

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While hydraulic fracturing (HF) is a widely employed process, the underlying fracturing processes are not clearly understood. Laboratory HF experiments with seismic monitoring can help with better understanding of the relationship between the generated HF network and the induced microseismicity while taking into account the effect of different HF parameters (injection fluid type and rate, stress conditions). In this study, HF experiments were performed on true-triaxially loaded Barre granite cubes, with real-time microseismic monitoring, to identify and characterize the stimulation processes associated with the viscosity and toughness dominated HF propagation regimes. Water and gear oil were used as the fracturing fluids. Moment tensor inversion technique was employed to determine the fracture mechanisms (tensile, shear, or mixed-mode). Viscosity propagation regime experiments involved higher breakdown pressures and larger injection fluid volumes relative to toughness propagation regime experiments. The microseismicity from toughness propagation regime experiments resulted in slightly larger b-value (2.25 compared to 2), indicating higher percentage of small magnitude events. The spatio-temporal evolution of fracture mechanisms indicated very dominant tensile fracturing (82-85%) during fracture initiation phase surrounding the injection region. As the fracture propagated away from the injection borehole, the number of shear and mixed-mode fracturing events increased. Overall, tensile fractures were dominant in both propagation regimes (ranging from 52% to 58%), which can be attributed maily to the absence of significant pre-existing faults/discontinuities in the very low permeability granite rock. Hosted fileessoar.10511277.1.docx available at https://authorea.com/users/523585/articles/595271microseismic-monitoring-of-laboratory-hydraulic-fracturing-experiments-in-graniticrocks-for-different-fracture-propagation-regimes

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Section: Determination Of Gutenberg-richter B-valuementioning

confidence: 99%

Microseismic monitoring of laboratory hydraulic fracturing experiments in granitic rocks for different fracture propagation regimes

Butt

Hedayat

Moradian

2022

Preprint

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“…us, some other fracturing fluids have been proposed to replace conventional water-based fracturing fluids, such as nitrogen and supercritical carbon dioxide (Sc-CO 2 ) [12,13]. Sc-CO 2 may be a good choice due to its characteristics of high density and low viscosity under the reservoir conditions, in which the temperature is higher than 31.1 °C and the pressure is higher than 7.38 MPa [14].…”

Section: Introductionmentioning

confidence: 99%

The Permeability Alternation of Shale Fractures due to Sc-CO2 Soaking: Implications for Sc-CO2 Fracturing and Deep CO2 Sequestration in Shale Reservoirs

Jia

Zhou

et al. 2022

Advances in Materials Science and Engineering

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The shale fracture permeability is critical in determining gas production and deep CO2 sequestration performance. Moreover, how shale fracture permeability evolves after interactions with supercritical carbon dioxide (Sc-CO2) should be understood to constrain the shale reservoir permeability and evaluate the long-term sealing ability of shale formations. In this research, we conducted soaking experiments with shale fractures and Sc-CO2 at various times and then measured the shale fracture permeability and hydraulic aperture evolution under different stress states. Additionally, we quantify the chemical compositions, pore characteristics, fracture surface roughness alternation through X-ray diffraction, nuclear magnetic resonance, scanning electron microscope, and optical profilometry techniques. Our results indicate that soaking with Sc-CO2 will dramatically increase the shale fracture permeability and aperture due to the calcite and dolomite dissolution. This free-face dissolution process will remove the mineral particles in the fracture surface, resulting in larger pores, peaks, and valleys in the fracture surfaces. This process may last for seven days, and after that, chemical reactions may terminate, and the rock-Sc-CO2 system turns stable. Our results explain how Sc-CO2 alters the shale fracture permeability through the chemical dissolution of specific minerals from a microscale analysis.

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“…With the aim of gaining a deeper understanding of the relationship between rock fracture and fracture scale, Shengxiang et al [6] investigated the correlation between rock breakage mechanism and the characteristic parameters of acoustic emission (AE) signal under splitting load. The attempt of a CO 2 hydraulic fracturing acoustic emission monitoring experiment [7] provides implications for the use of carbon dioxide (CO 2 ) to recover geothermal energy and shale gas. Fluid penetration leads to rock dilatation and fracture.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Study on Acoustic Emission in the Process of Rock Damage at Different Stress Paths

2021

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The study of the damage process of rock under external loads is good guidance for geotechnical construction design. The differences in rock damage processes and damage modes under different stress paths are rarely reported. To explore the effects of stress paths on rock damage processes, uniaxial compression experiments under three stress paths were conducted. Numerical simulation is also used to simulate the rock acoustic emission (AE) and fracture process. The results of the study indicate that the maximum acoustic emission events are at the peak of stress, and fractures are mainly formed at this stage. The peak of AE energy occurs before the peak of AE events. The damage pattern and fragmentation size of the rock are related to the way the stresses are loaded. It is noticed that there is appearance of a quiet period of AE events prior to the production of significant cracks. Minor damage to the rock is accompanied by the generation of bright white spots in the specimen, which is due to the high tensile or shear stress in the units. When the stress in these units exceeds their strength, the units break down and tiny cracks appear. As the external load increased, the cracks developed and penetrated, and the specimen was damaged. Under cyclic loading and unloading, the number of AE events increased significantly compared with the controlled displacement and controlled stress loading methods, and the radius of the AE circle became larger and the energy also increased, which indicates a greater degree of destruction of the rock under cyclic loading and unloading. The results of the study are of reference significance for rock crack propagation and fracture mode influenced by stress conditions and provide some guidance for construction design under different working conditions.

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Acoustic emission monitoring of hydraulic fracturing using carbon dioxide in a small-scale field experiment

Cited by 10 publications

References 34 publications

Microseismic monitoring of laboratory hydraulic fracturing experiments in granitic rocks for different fracture propagation regimes

Microseismic monitoring of laboratory hydraulic fracturing experiments in granitic rocks for different fracture propagation regimes

The Permeability Alternation of Shale Fractures due to Sc-CO2 Soaking: Implications for Sc-CO2 Fracturing and Deep CO2 Sequestration in Shale Reservoirs

An Experimental and Numerical Study on Acoustic Emission in the Process of Rock Damage at Different Stress Paths

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