Results 11 to 20 of about 7,917 (144)

Experimental evidence of electrification processes at the 2009 LAquila earthquake mainshock [PDF]

, 2015
Two types of coseismic magnetic field events are simultaneously observed: transient offset events and magnetic field signal that occurred at the destructive, Mw6.1 LAquila earthquake (EQ) mainshock. The offset event, conventionally interpreted as a signature of piezomagnetic effects, however could not be ascribed as such.
arxiv   +1 more source

Energy-Efficient Fracturing Based on Stress-Coupled Perforation [PDF]

arXiv, 2023
Hydraulic fracturing is one of the key technologies for reservoir stimulation in low-permeability/unconventional oil and gas fields. In response to the high energy consumption and greenhouse gas emissions caused by extreme flow-limiting perforation in hydraulic fracturing, stress-coupled perforation technology has been proposed to promote low-energy ...
arxiv  

Fracture network characterization with deep generative model based stochastic inversion [PDF]

arXiv, 2023
The distribution of fracture network is crucial to characterize the behaviors of flow field and solute transport, especially for enhanced geothermal systems, as fractures provide preferential flow paths. However, estimating the parameters of the fracture networks and quantifying their uncertainties based on observing data is a nontrivial task because ...
arxiv  

Multi-scale approach to invasion percolation of rock fracture networks [PDF]

Journal of Hydrology 519, 353 (2014), 2014
A multi-scale scheme for the invasion percolation of rock fracture networks with heterogeneous fracture aperture fields is proposed. Inside fractures, fluid transport is calculated on the finest scale and found to be localized in channels as a consequence of the aperture field. The channel network is characterized and reduced to a vectorized artificial
arxiv   +1 more source

Fracture Model Reduction and Optimization for Forchheimer Flows in Reservoir [PDF]

J. Math. Phys. 60, 051504 (2019), 2017
In this study, we analyze the flow filtration process of slightly compressible fluids in fractured porous media. We model the coupled fractured porous media system, where the linear Darcy flow is considered in porous media and the nonlinear Forchheimer equation is used inside the fracture.
arxiv   +1 more source

Enhancing Understanding of Hydraulic Fracture Tip Advancement through Inversion of Low-Frequency Distributed Acoustic Sensing Data [PDF]

arXiv, 2023
Characterizing the fluid-driven fracture tip advancing process presents a significant challenge due to the difficulty of replicating real-world conditions in laboratory experiments and the lack of precise field measurements. However, recent advances in low-frequency distributed acoustic sensing (LF-DAS) technology offer new opportunities to investigate
arxiv  

Interactive Estimation of the Fractal Properties of Carbonate Rocks [PDF]

arXiv, 2018
Scale invariance of intrinsic patterns is an important concept in geology that can be observed in numerous geological objects and phenomena. These geological objects and phenomena are described as containing statistically selfsimilar patterns often modeled with fractal geometry.
arxiv  

Abstractions and automated algorithms for mixed domain finite element methods [PDF]

arXiv, 2019
Mixed dimensional partial differential equations (PDEs) are equations coupling unknown fields defined over domains of differing topological dimension. Such equations naturally arise in a wide range of scientific fields including geology, physiology, biology and fracture mechanics.
arxiv  

Axisymmetric displacement flows in fluid-driven fractures [PDF]

Journal of Fluid Mechanics. 2022;953:A36
Displacement flows are common in hydraulic fracturing, as fracking fluids of different composition are injected sequentially in the fracture. The injection of an immiscible fluid at the center of a liquid-filled fracture results in the growth of the fracture and the outward displacement of the interface between the two liquids. We study the dynamics of
arxiv   +1 more source

Atomistic Simulations of Nanotube Fracture [PDF]

, 2002
The fracture of carbon nanotubes is studied by atomistic simulations. The fracture behavior is found to be almost independent of the separation energy and to depend primarily on the inflection point in the interatomic potential. The rangle of fracture strians compares well with experimental results, but predicted range of fracture stresses is marketly ...
arxiv   +1 more source