From pore scale to wellbore scale: Impact of geometry on wormhole growth in carbonate acidization

Cohen, C.; Ding, Didier Yu; Quintard, Michel; Bazin, Brigitte

doi:10.1016/j.ces.2008.03.021

Cited by 165 publications

(124 citation statements)

References 38 publications

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“…Moreover, estimates in the literature show significant boundary effects on core samples smaller than 1"×6", with no dependence on domain size above this critical threshold (Cohen et al, 2008). Simulations on different sized networks of sphere packs here reveal that increasing domain size decreases number of pore volumes to breakthrough.…”

Section: Model Applications: Mortar Couplingmentioning

confidence: 77%

“…Cohen et al (2008) found that simulations in radial geometries showed higher optimal injection rates than in linear core flood cases, suggesting that simple linear simulations are inapplicable to field conditions. Sun et al (2012) modeled a ~1 m 2 pore-scale region around a single-phase producing well coupled to larger scale Darcy blocks using over 7500 pore scale models coupled using finite-element mortars.…”

Section: Up-scaling Techniquesmentioning

confidence: 98%

“…However, optimal injection rates obtained thus far are not independent of scale. Some experimental research (Cohen et al 2008) suggests injection rate should be independent of domain size above a certain scale (about 1"x6") as boundary effects diminish. Using mortar coupling to go to very large scales will be instrumental in testing this hypothesis.…”

Section: Optimal Breakthrough Strategiesmentioning

confidence: 99%

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Pore-Network Modeling of Carbonate Acidization

Tansey

2014

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Carbonate reservoirs represent a significant portion of global hydrocarbon reserves. Injecting strong acids around the wellbore of carbonate wells can significantly increase near-wellbore permeability. A pore-network model is developed to capture permeability response of carbonates to acid stimulation. A novel pore-scale mass-transfer coefficient and pore-merging criterion are developed using finite element simulations. Preliminary results are able to reproduce the expected trends in permeability increase and capture the gamut of different dissolution regimes. Future work will focus primarily on using advanced subdomain coupling techniques to simulate much larger domain sizes to investigate the effects of domain size and determine a representative elementary volume.

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Section: Model Applications: Mortar Couplingmentioning

confidence: 77%

Section: Up-scaling Techniquesmentioning

confidence: 98%

Section: Optimal Breakthrough Strategiesmentioning

confidence: 99%

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Pore-Network Modeling of Carbonate Acidization

Tansey

2014

All Days

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“…In that context, it has also been studied experimentally [6,11] and numerically [12][13][14][15]. In the physics community, the interest toward these systems has been sparked by classical papers of Daccord and Lenormand, which analyzed the patterns formed in a dissolving plaster and related them to other pattern-forming systems, such as diffusion-limited aggregation [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The former is defined as [23] Pe = u 0 Ds 0 φ 0 (13) and measures the ratio of the convective fluxes to the diffusive fluxes. Here u 0 is the average Darcy flux in the initial system whereas φ 0 is an initial porosity of the system.…”

Section: Governing Equationsmentioning

confidence: 99%

Influence of Layering on the Formation and Growth of Solution Pipes

Petrus

Szymczak

2016

Front. Phys.

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In karst systems, hydraulic conduits called solution pipes (or wormholes) are formed as a result of the dissolution of limestone rocks by the water surcharged with CO 2 . The solution pipes are the end result of a positive feedback between spatial variations in porosity in the rock matrix and the local dissolution rate. Here, we investigate numerically the effect of rock stratification on the solution pipe growth, using a simple model system with a number of horizontal layers, which are less porous than the rest of the matrix. Stratification is shown to affect the resulting piping patterns in a variety of ways. First of all, it enhances the competition between the pipes, impeding the growth of the shorter ones and enhancing the flow in the longer ones, which therefore grow longer. This is reflected in the change of the pipe length distribution, which becomes steeper as the porosity contrast between the layers is increased. Additionally, stratification affects the shapes of individual solution pipes, with characteristic widening of the profiles in between the layers and narrowing within the layers. These results are in qualitative agreement with the piping morphologies observed in nature.

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Pore-space alteration induced by brine acidification in subsurface geologic formations

Ovaysi

Piri

2014

Water Resour. Res.

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[1] A new Lagrangian particle-based method is presented to simulate reactive transport in natural porous media. This technique is based on Modified Moving Particle Semi-implicit (MMPS) and takes as input high-resolution voxel images of natural porous media. The flow field in the medium is computed by solving the incompressible Navier-Stokes equations. Moreover, a multicomponent ion transport model is coupled with a homogeneous and heterogeneous reactions module to handle pore-space alteration (i.e., pore-wall dissolution). The model is first successfully validated against the experimental data available in the literature. Subsequently, X-ray microtomographic images of two naturally occurring porous media are used to investigate the impact of reaction kinetics and pore-space topology on pore-space alteration induced by brine acidification in subsurface conditions. We observed that at the normal rates of reactions no significant change in porosity and permeability takes place in the short term. Whereas, higher reaction rates caused major changes in the macroscopic properties (e.g., porosity and permeability) of the rocks. We also show that these changes are strongly affected by the rocks' pore-scale topologies.Citation: Ovaysi, S., and M. Piri (2014), Pore-space alteration induced by brine acidification in subsurface geologic formations, Water Resour. Res., 50,[440][441][442][443][444][445][446][447][448][449][450][451][452]

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From pore scale to wellbore scale: Impact of geometry on wormhole growth in carbonate acidization

Cited by 165 publications

References 38 publications

Pore-Network Modeling of Carbonate Acidization

Pore-Network Modeling of Carbonate Acidization

Influence of Layering on the Formation and Growth of Solution Pipes

Pore-space alteration induced by brine acidification in subsurface geologic formations

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