scholarly journals Investigation of the dissipative structures following microseismic diffusion during hydraulic fracturing of methane-hydrate-bearing sand

2021 ◽  
Vol 230 ◽  
pp. 01015
Author(s):  
Victor Nazimko ◽  
Olga Pidgurna ◽  
Olexiy Kusen
Keyword(s):  
Hydraulic Fracturing ◽  
Methane Hydrate ◽  
Thermodynamic System ◽  
Dissipative Structures ◽  
Explicit Calculation ◽  
Structure Evolution ◽  
Liquid Injection ◽  
New Findings ◽  
Hydrate Deposit ◽  
Open Thermodynamic System

Hydraulic fracturing is a prospective technology for methane hydrate deposit exploitation. The evolution of hydraulically stimulated fractures around the point of liquid injection is simulated. For this purpose, the FLAC3D computer model is used because of its explicit calculation cycle that imitates real physics, prevents numerical instability, and reproduces a realistic path during simulation of the nonlinear rock massif behavior. The results of the simulation provide for new findings, namely, the spatial asymmetry and synchronism violation, spatial deviation, discontinuity, and recurrence during microseismic diffusion, which follow the process of hydraulic fracturing. In addition, dissipative structures were developed due to entropy production, since gas hydrate strata are an open thermodynamic system, which transforms and dissipates the energy of the injected liquid. The process of dissipative structure evolution should be controlled to enhance the gas yield from the hydrates.

Laboratory Study of Hydraulic Fracturing Behavior in Unconsolidated Sands for Methane Hydrate Production

2008 ◽  
Author(s):  
Takatoshi Ito ◽  
Akira Igarashi ◽  
Kiyofumi Suzuki ◽  
Sadao Nagakubo ◽  
Maki Matsuzawa ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Laboratory Study ◽  
Methane Hydrate ◽  
Unconsolidated Sands

Wellenausbreitung in einem offenen thermodynamischen System zeitlich veränderlicher Gesamtenergie / Wave Propagation in an open Thermodynamic System with Time Variation of the Total Energy

1970 ◽  
Vol 25 (5) ◽  
pp. 730-735
Author(s):  
H.-D. Freund ◽  
G. Locke
Keyword(s):  
Total Energy ◽  
Thermodynamic System ◽  
Acoustic Velocity ◽  
Wave System ◽  
Carrier System ◽  
Phase Step ◽  
Wave Characteristics ◽  
Time Averages ◽  
Absorption And Dispersion ◽  
Open Thermodynamic System

The absorption and dispersion of sound due to dissipative phenomena such as diffusion, heat conduction and viscous flow have been investigated by Herzfeld, Litovitz and others. Whereas in these studies the total energy of the carrier system remains constant, we consider the case that it is changing. It turnes out that the wavelength X remains constant, while all other wave characteristics become time depend and can be connected with the usual sound velocity of the carrier system ..The change in energy density takes place via the potential energy. Thus the original balance between potential and kinetic energy is disturbed. Modulation vibrations of the wave amplitudes around the time averages arise. In addition dephasing of the pressure and density components with respect to the acoustic velocity takes place. The phasevelocities are disturbed too. They differ from time dependence of c(t).These differences are running asymptotically towards zero, i. e. after a longer period of time a phase step remains of the total wave system. This phase step is negative for increasing energy of the carrier system and positive for decreasing energy. The value of the phase step is proportional to the wavelength λ, i. e. systems of this kind show dispersion.

scholarly journals Hydraulic fracturing in methane-hydrate-bearing sand

RSC Advances ◽  
2016 ◽  
Vol 6 (77) ◽  
pp. 73148-73155 ◽  
Author(s):  
Yoshihiro Konno ◽  
Yusuke Jin ◽  
Jun Yoneda ◽  
Takashi Uchiumi ◽  
Kazunori Shinjou ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Methane Hydrate ◽  
Effective Permeability

Hydraulic fracturing in methane-hydrate-bearing sand can generate laminar fractures and increase the effective permeability.

Permeability of sediment cores from methane hydrate deposit in the Eastern Nankai Trough

2015 ◽  
Vol 66 ◽  
pp. 487-495 ◽  
Author(s):  
Yoshihiro Konno ◽  
Jun Yoneda ◽  
Kosuke Egawa ◽  
Takuma Ito ◽  
Yusuke Jin ◽  
...  
Keyword(s):  
Methane Hydrate ◽  
Nankai Trough ◽  
Sediment Cores ◽  
Hydrate Deposit

The Influence of Hydrogen on the Process of Plastic Flow Self-Organization in Ti

2016 ◽  
Vol 685 ◽  
pp. 601-606
Author(s):  
Alexey Lunev ◽  
Mikhail V. Nadezhkin ◽  
Svetlana Barannikova ◽  
Lev B. Zuev ◽  
Natalia A. Ionova
Keyword(s):  
Pure Titanium ◽  
Strength Properties ◽  
Dissipative Structures ◽  
Structure Evolution ◽  
Material Strength ◽  
Commercially Pure Titanium ◽  
Localized Deformation ◽  
Commercially Pure ◽  
Kinetics Of ◽  
Hydrogenation Treatment

The paper presents the study of the effect of hydrogenation on the mechanical properties of commercially pure titanium. It has been found that the localized deformation zones occurring in the plastically deforming Ti samples are stationary dissipative structures. The kinetics of dissipative structure evolution was studied. The hydrogenation treatment is found to enhance a tendency to strain localization in as-treated material, which affects significantly material strength properties.

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