Numerical Modeling of Isothermal and Nonisothermal Flow in Unsaturated Fractured Rock: A Review

Pruess, Karsten; Wang, J. S. Y.

doi:10.1029/gm042p0019

Cited by 16 publications

(14 citation statements)

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“…This is mainly due to difficulties arising in describing the interactions between the flow processes in different domains. Several approaches have been proposed such as dual‐porosity (van Genuchten and Wierenga, 1976), dual‐permeability (Pruess and Wang, 1987; Gerke and van Genuchten, 1993; Jarvis, 1994), multi‐porosity and/or multi‐permeability models (Gwo et al , 1995; Hutson and Wagenet, 1995). The results obtained with these approaches show good results as long as the soil has a relatively low degree of heterogeneity and as a good knowledge of the spatial distribution of the heterogeneity exists.…”

Section: Introductionmentioning

confidence: 99%

Hydrological and hydrochemical processes observed during a large‐scale infiltration experiment at the Super‐Sauze mudslide (France)

Debieche

Bogaard

Marc

et al. 2011

Hydrological Processes

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Abstract:Rainfall is one of the major triggering factors of landslides, and its pattern controls their temporal behaviour. Characterization of the groundwater processes and possible preferential infiltration of rainfall is necessary, challenging and very relevant for landslide hazard analysis. The objective of this paper is to identify the groundwater dynamics (matrix flow and preferential flow) within highly heterogeneous and fissured reworked black marl material, using a large-scale infiltration test. The artificial rainfall experiment over a 100 m 2 infiltration plot monitored with several hydrological, hydrochemical and geophysical equipments was carried out on the Super-Sauze mudslide (South French Alps). High resolution groundwater and water quality measurements were collected. Artificial rainfall was applied over a period of 14 days. Conservative tracers (Br and Cl ) were used successively during the infiltration period. The mean rainfall intensity was 8Ð5 mm h 1 with a mean tracer concentration of 100 mg l 1 . The hydrodynamic and hydrochemical responses of the tracing experiments allowed us to get a new insight into: (1) the horizontal and vertical variability of the rain infiltration in unstable black marl hillslopes; (2) the effect of shallow fissuration on the groundwater recharge; (3) the role of piston flow on the rate of water level changes and the increase of pore water pressures and (4) the effect of material heterogeneity in the development of preferential water flows and local perched water tables.

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Section: Introductionmentioning

confidence: 99%

Hydrological and hydrochemical processes observed during a large‐scale infiltration experiment at the Super‐Sauze mudslide (France)

Debieche

Bogaard

Marc

et al. 2011

Hydrological Processes

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“…For example dual-porosity and dual-permeability models both assume that the porous medium consists of two interacting regions, one associated with the inter-aggregate, macropore, or fracture system, and one comprising micropores (or intra-aggregate pores) inside soil aggregates or the rock matrix. Dualporosity models assume that water in the matrix is stagnant, but dual-permeability models assume that water can move in both the inter-and intra-aggregate pore regions (Gerke and van Genuchten, 1993;Jarvis, 1994;Pruess and Wang, 1987). Available dualpermeability models differ mainly in how they implement water flow in and between the two pore regions, especially with respect to the degree of simplification and empiricism (Simunek et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical simulation of water movement in soil

Zhu¹,

Therrien²,

Yang³

et al. 2012

Proceedings of the Institution of Civil Engineers - Water Manag

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Preferential flow refers to a flow transport pattern where water and solute flows around the soil matrix, contributing to accelerating velocity of movement in the soil; soil recharge occurs over the whole inlet boundary. Preferential flow is produced by a large number of macropores and fractures in the soil, such as root or worm holes, and is very important to groundwater recharge owing to its rapid movement. Using the reaction of iodine turning blue on contact with starch, outdoor tracer experiments of heterogeneous flow in clay loam for different scales and boundary conditions are designed, so that the heterogeneous flow patterns can be studied. Using experimental image analysis, the soil is divided into a matrix and a preferential channel network, formed by the spatial structure of the flow channels. An irregular flow network is established through random generation of angles, lengths, aperture and location coordinates of flow channels, in order to achieve an accurate description of preferential flow channels. According to the soil moisture of each layer obtained by tracer experiments, soil water retention curve and saturated hydraulic conductivity, soil moisture variation was simulated. The distribution of the channel network and models of water movement in the soil are used to undertake a quantitative analysis of the influence of preferential flow on soil water migration.

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“…Such understanding is required for effective mitigation of related project risks and value erosion. Consequently, the development of a robust, yet simple, approach to modelling thermal losses to the adjacent formations has always attracted considerable interests among generations of researchers Farouq Ali 2017, 2018;LaForce et al 2014;Muradov and Davies 2012;Pruess and Zhang 2005;Pruess and Narasimhan 1988;Vinsome and Westerveld 1980;Weinstein 1972Weinstein , 1974Chase and O'Dell 1973).…”

Section: Introductionmentioning

confidence: 99%

“…As would be expected, different fitting functions have been used in practice. These applications highlighted the sensitivity of the predicted thermal losses to the fitting function utilised (Pruess and Zhang 2005;Pruess and Narasimhan 1988;Vinsome and Westerveld 1980;Weinstein 1972Weinstein , 1974Chase and O'Dell 1973).…”

Section: Introductionmentioning

confidence: 99%

Applicability of heat-exchanger theory to estimate heat losses to surrounding formations in a thermal flood

Lawal¹

2019

J Petrol Explor Prod Technol

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Heat losses to cap and base rocks undermine the performance of a thermal flood. As a contribution to this subject, this paper investigates the applicability of the principles of heat exchanger to characterise heat losses between a petroleum reservoir and the adjacent geologic systems. The reservoir-boundary interface is conceptualised as a conductive wall through which the reservoir and adjacent formations exchange heat, but not mass. For a conduction-dominated process, the heat-transport equations are formulated and solved for both adiabatic and non-adiabatic conditions. Simulations performed on a field-scale example show that the rate of heating a petroleum reservoir is sensitive to the type of fluids saturating the adjoining geologic systems, as well as the characteristics of the cap and base rocks of the subject reservoir. Adiabatic and semi-infinite reservoir assumptions are found to be poor approximations for the examples presented. Validation of the proposed model against an existing model was satisfactory; however, remaining differences in performances are rationalised. Besides demonstrating the applicability of heat-exchanger theory to describe thermal losses in petroleum reservoirs, a novelty of this work is that it explicitly accounts for the effects of the reservoir-overburden and reservoir-underburden interfaces, as well as the characteristics of the fluid in the adjacent strata on reservoir heating. These and other findings should aid the design and management of thermal floods.

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Numerical Modeling of Isothermal and Nonisothermal Flow in Unsaturated Fractured Rock: A Review

Cited by 16 publications

References 50 publications

Hydrological and hydrochemical processes observed during a large‐scale infiltration experiment at the Super‐Sauze mudslide (France)

Hydrological and hydrochemical processes observed during a large‐scale infiltration experiment at the Super‐Sauze mudslide (France)

Experimental and numerical simulation of water movement in soil

Applicability of heat-exchanger theory to estimate heat losses to surrounding formations in a thermal flood

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