Swelling and osmotic flow in a potential host rock

Horseman, S.T.; Harrington, J.F.; Noy, D.J.

doi:10.1016/j.pce.2006.05.003

Cited by 30 publications

(43 citation statements)

References 12 publications

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“…It has shown that fracture transmissivity is low and comparable with the permeability of intact Opalinus Clay. This shows that the closure of the artificial fracture has been very effective at the full range of normal stresses tested which corresponds to the results from Harrington et al (2007) who observed a significant increase in permeability at effective stresses lower than around 1.0 MPa. The transmissivity of the idealised fracture is significantly lower than those seen in the Selfrac project (Trick, 2003).…”

Section: Fracture Transmissivity Variation With Normal Loadsupporting

confidence: 88%

“…It is more likely that this feature is the result of differences between the pore and matrix compressibility. Horseman et al (2007) showed that a change in pore-water pressure at fixed total stress has a significantly larger effect on specimen volume than does a change in total stress at fixed pore-water pressure. Therefore it can be concluded that fracture transmissivity is not only a function of normal stress, it is a function of pore pressure.…”

Section: Fracture Transmissivity Variation With Normal Loadmentioning

confidence: 98%

“…The two blocks of material were measured and weighed prior to assembly of the apparatus; results are shown in Table 1. Moisture content was not measured for the test material, so in absence of this data it was taken from Horseman et al (2007). Porosity, bulk density, dry density and degree of saturation were based on a measured grain density (BS1377: Part 2: 1990) of 2.69 Mg.m -3 .…”

Section: Experimental Geometrymentioning

confidence: 99%

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Fracture transmissivity as a function of normal and shear stress: First results in Opalinus Clay

Cuss

Milodowski

Harrington

2011

Physics and Chemistry of the Earth, Parts A/B/C

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Section: Fracture Transmissivity Variation With Normal Loadsupporting

confidence: 88%

Section: Fracture Transmissivity Variation With Normal Loadmentioning

confidence: 98%

Section: Experimental Geometrymentioning

confidence: 99%

See 1 more Smart Citation

Fracture transmissivity as a function of normal and shear stress: First results in Opalinus Clay

Cuss

Milodowski

Harrington

2011

Physics and Chemistry of the Earth, Parts A/B/C

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“…A core sample (a 1 cm thick disc of 5 cm radius) of this material is at equilibrium when both sides of the sample are in contact with a solution corresponding to the formation equilibrium concentration, 0.245 mol L −1 . A maximum 0.8% swelling (DV/V) was observed by Horseman et al [2007] when one side of this sample was suddenly placed in contact with distilled water. This can be readily understood in the light of the analysis presented in section 3.…”

Section: Implications For the Storativitymentioning

confidence: 95%

“…The parameter values given by Horseman et al [2007] are listed in the caption of Figure 8. The swelling deformation DV/V was calculated at each time step by summing the individual deformations of each node i dV i and by using equation (31) where ds = 0 (constant total stress).…”

Section: Implications For the Storativitymentioning

confidence: 99%

What is the significance of pore pressure in a saturated shale layer?

Gonçalvès

Rousseau-Gueutin

Marsily

et al. 2010

Water Resources Research

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International audienceElectrostatic interactions, associated with negatively charged surfaces of clay minerals, produce a so-called "disjoining pressure" when diffuse layers overlap, i.e., at low porosity. Disjoining pressure is the pressure difference between the water in the clay pore space and that in a bulk solution at the same depth. Another widely used concept in clay-rocks is the "swelling pressure." It corresponds in fact to the macroscopic average of the disjoining pressure. This study proposes to determine the value of the swelling pressure of a natural material by a simple volume-averaging approach of the disjoining pressure, calculated for each clay mineral present in the material. The swelling pressure, which is dependent on the salinity of the pore fluid, is introduced into a hydrochemomechanical coupling, yielding a more general pressure diffusion equation. The results are compared to swelling pressure measurements for natural shale samples. The implications of this swelling pressure for water pressure measurements in natural formations are also discussed

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Experimental examination of the relationships among chemico‐osmotic, hydraulic, and diffusion parameters of Wakkanai mudstones

et al. 2014

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Sequential permeability and chemical osmosis experiments on Wakkanai mudstones were performed to explore the relationships between the semipermeability of clayey rocks and the hydraulic and diffusion parameters as well as the pore structure characteristics. The wide ranges in osmotic efficiency (0.0004-0.046) and intrinsic permeability (8.92 × 10 À20 to 1.24 × 10 À17 m 2 ) reflect the variation in the pore size distributions of the Wakkanai mudstones. A regression analysis between osmotic efficiency and permeability shows that the osmotic efficiency is proportional to the inverse of permeability, suggesting that the permeability is indeed indicative of the degree of semipermeability. Osmotic efficiency was determined invariant with the effective diffusion coefficient for the Wakkanai mudstones (3.59-8.36 × 10 À11 m 2 /s) due to their small osmotic efficiencies (≤0.046). The wide variation in osmotic efficiencies and pore structure characteristics of Wakkanai mudstones indicates that the nanoscale pores enable semipermeability in Wakkanai mudstones. However, the pressure evolution caused by chemical osmosis is limited by the connected wide pores that are the main conduits for water, thus dissipating the osmotic pressure buildup induced by the semipermeability of nanoscale pores.

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Swelling and osmotic flow in a potential host rock

Cited by 30 publications

References 12 publications

Fracture transmissivity as a function of normal and shear stress: First results in Opalinus Clay

Fracture transmissivity as a function of normal and shear stress: First results in Opalinus Clay

What is the significance of pore pressure in a saturated shale layer?

Experimental examination of the relationships among chemico‐osmotic, hydraulic, and diffusion parameters of Wakkanai mudstones

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