نتایج جستجو برای: fracture aperture

تعداد نتایج: 122733  

Journal: :Ground water 2013
Sung-Hoon Ji Yong-Kwon Koh Kristopher L Kuhlman Moo Yul Lee Jong Won Choi

In a series of field experiments, we evaluate the influence of a small water pressure change on fracture aperture during a hydraulic test. An experimental borehole is instrumented at the Korea Atomic Energy Research Institute (KAERI) Underground Research Tunnel (KURT). The target fracture for testing was found from the analyses of borehole logging and hydraulic tests. A double packer system was...

2001
Russell L. Detwiler Harihar Rajaram Robert J. Glass

Dissolution of nonaqueous-phase liquids (NAPLs) from variable-aperture fractures couples fluid flow, transport of the dissolved NAPL, interphase mass transfer, and the corresponding NAPL-water-interface movement. Each of these fundamental processes is controlled by fracture-aperture variability and entrapped-NAPL geometry. We develop a depth-averaged computational model of dissolution that inco...

2004
Sudipta Sarkar

In this paper we study fluid flow in fractures using numerical simulation and address the challenging issue of hydraulic property characterization in fractures. The methodology is based on Computational Fluid Dynamics, using a finite-volume based discretization scheme. Steady-state, viscous, laminar flow simulations for a Newtonian fluid are carried out in both 2D and 3D fracture models. In 2D,...

2010
Russell L. Detwiler

[1] During reactive fluid flow in saturated fractures, the relative rates of dissolved mineral transport and local reactions strongly influence local aperture alterations and the resulting changes in fracture permeability (or transmissivity). In the presence of an entrapped residual nonaqueous phase (e.g., CO2 or oil), the spatial distribution of the entrapped phase will influence flow and tran...

2008
Russell L. Detwiler

[1] Problems such as CO2 sequestration, petroleum production and nuclear waste isolation involve the potential for rock-water reactions. Mineral alteration resulting from reactive fluid flow can lead to significant changes to fracture transport properties. At depth, these processes are further influenced by stresses in the host rock. To quantitatively explore these coupled processes, we built a...

2016
Bo Zhang Xiao Li Zhaobin Zhang Yanfang Wu Yusong Wu Yu Wang Vasily Novozhilov

Numerical simulation is very useful for understanding the hydraulic fracturing mechanism. In this paper, we simulate the hydraulic fracturing using the distinct element approach, to investigate the effect of some critical parameters on hydraulic fracturing characteristics. The breakdown pressure obtained by the distinct element approach is consistent with the analytical solution. This indicates...

2014
Ali N. Ebrahimi Falk K. Wittel Nuno A.M. Araújo Hans J. Herrmann

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 channel network (ACN). Different realizati...

1999
M. J. Nicholl H. Rajaram R. J. Glass

Fracture transmissivity and detailed aperture fields are measured in analog fractures specifically designed to evaluate the utility of the Reynolds equation. We employ a light transmission technique with well-defined accuracy (;1% error) to measure aperture fields at high spatial resolution (;0.015 cm). A Hele-Shaw cell is used to confirm our approach by demonstrating agreement between experime...

2006
Hideaki Yasuhara Derek Elsworth

A numerical model is presented to describe the evolution of fracture aperture (and related permeability) mediated by the competing chemical processes of pressure solution and free-face dissolution/precipitation; pressure (dis)solution and precipitation effect net-reduction in aperture and free-face dissolution effects netincrease. These processes are incorporated to examine coupled thermo-hydro...

2002
Russell L. Detwiler Harihar Rajaram Robert J. Glass

[1] We compare solute transport experiments to simulations in a partially-saturated, variable-aperture fracture in measured fracture aperture and entrapped-air geometry fields. The computational model tracks particles through a quasi-three-dimensional velocity field that is based on the two-dimensional solution to the Reynolds equation. The model predicts 84% of the relative increase in dispers...

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