scholarly journals Disturbed zone effects: Two phase flow in regionally water-saturated fractured rock

1995 ◽  
Author(s):  
J.T. Geller ◽  
C. Doughty ◽  
J.C.S. Long
Keyword(s):  
Two Phase Flow ◽  
Fractured Rock ◽  
Phase Flow ◽  
Two Phase ◽  
Disturbed Zone ◽  
Water Saturated

State of the art of modelling two-phase flow in fractured rock

1997 ◽  
Vol 31 (3-4) ◽  
pp. 157-166 ◽  
Author(s):  
Z. Wanfang ◽  
H. S. Wheater ◽  
P. M. Johnston
Keyword(s):  
Two Phase Flow ◽  
State Of The Art ◽  
Fractured Rock ◽  
Phase Flow ◽  
Two Phase

scholarly journals Grouting Mechanism in Water-Bearing Fractured Rock Based on Two-Phase Flow

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Bo Ren ◽  
Wenqiang Mu ◽  
Bingyou Jiang ◽  
Guofeng Yu ◽  
Lianchong Li ◽  
...  
Keyword(s):  
Diffusion Model ◽  
Flow Model ◽  
Two Phase Flow ◽  
Fractured Rock ◽  
Optimization Method ◽  
Phase Flow ◽  
Optimization Scheme ◽  
Two Phase ◽  
Height Range ◽  
Basic Work

Grouting is always used in mine water plugging, reinforcement, and other disaster prevention projects. The diffusion mechanism of slurry in fractured rock is affected by geological environment and slurry performance, which should be revealed and characterized better. Based on the two-phase flow diffusion theory, a slurry diffusion model considering flowing water condition was established for a blocking area of a fracture zone in one case from China. The feasibility of two-phase flow model in grouting diffusion calculation was analyzed. The diffusion model in dynamic water environment was studied, and the diffusion range varying with time in the grouting area of Zhangji Coal Mine was explored. The optimization method of multi grouting holes was put forward, and the influence of water flowing was discussed. The results show that the slurry diffusion calculated by the two-phase flow model was feasible and consistent with the experimental study. The dynamic water can change the conventional circular diffusion state of slurry, but its pattern was oval and leaf type. There were different penetration distances in directions, and typical grouting voids were made on the side and upstream. When the single-hole grouting was carried out, the predetermined value can be achieved in the height range, but it was only about 15 m on the side because of the water flowing, which cannot meet the requirements. The optimization scheme of grouting was put forward, which adopted multiple grouting holes in the long side, and grouting in different directions and periods to avoid the possible problems of multihole intersection. The rationality and effectiveness of the proposed optimization method were verified through the calculation of water yield and analysis of cement composition from the drilling core in the grouted zone. In the grouting process, the water flowing has double effects, which has a significant role in promoting and scouring along the flow direction, but there is a significant weakness in the side diffusion. It is very important to realize the rational use of the dynamic water through the optimization scheme. This study is an important basic work of grouting mechanism, and it is expected to promote the development of grouting technology and application of two-phase fluid-solid coupling theory.

scholarly journals Migration of Gas in Water Saturated Clays by Coupled Hydraulic-Mechanical Model

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-25 ◽  
Author(s):  
Aliaksei Pazdniakou ◽  
Magdalena Dymitrowska
Keyword(s):  
Mechanical Model ◽  
Fluid Transport ◽  
Two Phase Flow ◽  
Ion Beam ◽  
Damage Model ◽  
Phase Flow ◽  
Two Phase ◽  
Local Conditions ◽  
Small Pore ◽  
Water Saturated

Understanding the gas migration in highly water saturated sedimentary rock formations is of great importance for safety of radioactive waste repositories which may use these host rocks as barrier. Recent experiments on drainage in argillite samples have demonstrated that they cannot be represented in terms of standard two-phase flow Darcy model. It has been suggested that gas flows along highly localized dilatant pathways. Due to very small pore size and the opacity of the material, it is not possible to observe this two-phase flow directly. In order to better understand the gas transport, a numerical coupled hydraulic-mechanical model at the pore scale is proposed. The model is formulated in terms of Smoothed Particle Hydrodynamics (SPH) and is applied to simulate drainage within a sample reconstructed from the Focused Ion Beam (FIB) images of Callovo-Oxfordian claystone. A damage model is incorporated to take into account the degradation of elastic solid properties due to local conditions, which may lead to formation of new pathways and thus to modifications of fluid transport. The influence of the damage model as well as the possible importance of rigid inclusions is demonstrated and discussed.

scholarly journals Thermoplastic Micromodel Investigation of Two-Phase Flows in a Fractured Porous Medium

2017 ◽  
Author(s):  
Shao-Yiu Hsu ◽  
Zhong-Yao Zhang ◽  
Chia-Wen Tsao
Keyword(s):  
Porous Media ◽  
Two Phase Flow ◽  
Fractured Rock ◽  
Flow Behavior ◽  
Phase Flow ◽  
Large Radius ◽  
Two Phase ◽  
Visualization System ◽  
Optical Visualization ◽  
Small Pore

In the past few years, micromodels have become a useful tool for visualizing flow phenomena in porous media with pore structures, e.g., the multifluid dynamics in soils or rocks with fractures in natural geomaterials. Micromodels fabricated using glass or silicon substrates incur high material cost; in particular, the microfabrication-facility cost for making a glass or silicon-based micromold is usually high. This may be an obstacle for researchers investigating the two-phase-flow behavior of porous media. A rigid thermoplastic material is a preferable polymer material for microfluidic models because of its high resistance to infiltration and deformation. In this study, cyclic olefin copolymer (COC) was selected as the substrate for the micromodel because of its excellent chemical, optical, and mechanical properties. A delicate micromodel with a complex pore geometry that represents a two-dimensional (2D) cross-section profile of a fractured rock in a natural oil or groundwater reservoir was developed for two-phase-flow experiments. Using an optical visualization system, we visualized the flow behavior in the micromodel during the processes of imbibition and drainage. The results show that the flow resistance in the main channel (fracture) with a large radius was higher than that in the surrounding area with small pore channels when the injection or extraction rates were low. When we increased the flow rates, the extraction efficiency of the water and oil in the mainstream channel (fracture) did not increase monotonically because of the complex two-phase-flow dynamics. These findings provide a new mechanism of residual trapping in porous media.

scholarly journals Advanced Conceptual Models for Unsaturated and Two-Phase Flow in Fractured Rock

2003 ◽  
Author(s):  
Michael J Nicholl ◽  
Robert J Glass ◽  
Harihar Rajaram ◽  
Thomas R Wood
Keyword(s):  
Conceptual Models ◽  
Two Phase Flow ◽  
Fractured Rock ◽  
Phase Flow ◽  
Two Phase

scholarly journals Advanced Conceptual Models for Unsaturated and Two-Phase Flow in Fractured Rock

2004 ◽  
Author(s):  
Michael J Nicholl ◽  
Robert J Glass ◽  
Harihar Rajaram ◽  
Thomas R Wood
Keyword(s):  
Conceptual Models ◽  
Two Phase Flow ◽  
Fractured Rock ◽  
Phase Flow ◽  
Two Phase

An experimental study of two-phase flow behaviour through pipes and hydraulically-fractured rock specimens

2019 ◽  
Vol 102 ◽  
pp. 325-341 ◽  
Author(s):  
W.A.M. Wanniarachchi ◽  
P.G. Ranjith ◽  
M.S.A. Perera ◽  
T.D. Rathnaweera ◽  
C. Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Two Phase Flow ◽  
Fractured Rock ◽  
Flow Behaviour ◽  
Phase Flow ◽  
Two Phase ◽  
Rock Specimens
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