A Review of Mercury Porosimetry

Rootare, Hillar M.

doi:10.1007/978-1-4615-8981-5_9

Cited by 26 publications

(8 citation statements)

References 31 publications

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“…The particle density (Fsoil) and a total volume fraction of mesopores in soil aggregates (θm) were measured by mercury intrusion porosimetry (32,35,36) by Porous Materials, Inc. (Ithaca, NY).…”

Section: Methodsmentioning

confidence: 99%

Validation of a Hybrid “Two-Site Gamma” Model for Naphthalene Desorption Kinetics

Ahn

Lion

Shuler

1999

Environ. Sci. Technol.

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Three models for sorption/desorption of polycyclic aromatic hydrocarbon (PAH) contaminants from soil were compared for their ability to predict the transport of PAH in soil: a "gamma" model, a "two-site/two-region" nonequilibrium model, and a "hybrid" model. In the "hybrid" model, soil organic matter was conceptually divided into two compartments; a fraction with rapid sorption/desorption kinetics and a compartment with mass-transfer-limited kinetics. Contaminant sorbed in the rapid compartment was assumed to be in instantaneous equilibrium with the aqueous phase, while the release of contaminant from the slow fraction was assumed to be governed by a gamma distribution of rate coefficients. The "hybrid" model successfully described the initial rapid release of a model PAH contaminant, naphthalene, from a sieved soil sample of moderate organic content (=2.3%) as well as the following slow release observed over 25 days in batch desorption experiments. Other necessary model parameters, such as the hydrodynamic dispersion coefficient of naphthalene and the macropore porosity, were evaluated in separate experiments. A transport model incorporating the "hybrid" model for naphthalene sorption/desorption successfully predicted the elution profile of naphthalene in independent soil-column experiments with no adjustable parameters. The success of the hybrid model suggests that a wide array of rate controls govern PAH desorption. This conclusion is consistent with the view of soils as consisting of a mix of different sorptive constituents and heterogeneous physical constraints on PAH release.

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Section: Methodsmentioning

confidence: 99%

Validation of a Hybrid “Two-Site Gamma” Model for Naphthalene Desorption Kinetics

Ahn

Lion

Shuler

1999

Environ. Sci. Technol.

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“…This observation is consistent with previous studies. 38,39 After the CO 2 -Frac impact, the coal samples undergo significant changes.…”

Section: Analysis Of Fesem Observationmentioning

confidence: 99%

“…The high-pressure mercury experiments were conducted using the Micromeritics AutoPore IV 9505 mercury intrusion porosimeter, and the relationship between pressure and pore size was determined using the Washburn equation. 38,39 3.2. Test Results and Discussion.…”

Section: Pore-fracture Structure Alterationmentioning

confidence: 99%

Research on Pore-Fracture Structure Alteration and Gas Emission Homogenization in an Outburst Coal Seam Induced by CO₂ Gas Fracturing

Yang,

Cao,

Zhang

et al. 2024

ACS Omega

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Considering the alarming frequency of coal mine gas disasters globally, there is an urgent need to develop efficient gas control technologies to ensure mining safety. This study focuses on the problem of high peak gas emission restriction in the process of coal roadway tunneling in outburst coal seams, taking the No. 15 outburst coal seam of the Pingshu Coal Mine as the research object. Based on coal sample testing analysis and the application of CO 2 gas fracturing (CO 2 -Frac) in coal mines, a comprehensive evaluation was conducted on pore-fracture structure alteration and homogenization gas emission effect induced by CO 2 -Frac, providing technical solutions for coal mine safety production. The results are as follows: (1) CO 2 -Frac induces fracture propagation and the development of three types of fracture structures: Tri-Wing Fracture, Damage Markers, and Coal Matrix Fragmentation. (2) Following CO 2 -Frac at 150 MPa, the pore volume and average diameter of pores in the 100−10,000 nm range increased by 128% and 61%, respectively, compared to the pre-CO 2 -Frac state. (3) During the excavation period, continuous monitoring of the airflow for 3 days showed a significant homogenization of gas emission, with a maximum value of 0.450% and a variance value of 0.0031, indicating a reduction of 31% and 68%, respectively. These results reveal several key findings: The pore-fracture structure alteration enhances gas diffusion and permeation, providing high-speed pathways for gas migration, resulting in a substantial increase in gas extraction efficiency. During coal cutting, the modified coal exhibits homogenized gas emission, eliminating the high peak phenomenon and achieving safe and efficient mining. These findings demonstrate that CO 2 -Frac has broad potential in gas emission homogenization for widespread application in coal mines with similar gas geological conditions.

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“…A detailed review of MICP can be referred to elsewhere (Rootare 1970, Diamond 2000. From the pore size distribution, the fractal dimension for pore size can be obtained as Li 2001, Yu 2008): (29) where N(ՆD) represents the total number of pores in the porous medium with diameters greater than D, and D max is the maximum pore diameter.…”

Section: Experimental Studymentioning

confidence: 99%

An Innovative Technique for Estimation of Permeability of Shale Gas Reservoirs

et al. 2015

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Characterization of flow processes in multi-scale porous system (nanopores to mesopores) in tight rocks, such as the shales, is challenging because of the coexistence of various flow regimes in the porous media. Although some methods based on dusty gas model (DGM) have been applied to determine the apparent gas permeability of shales (Javadpour 2009, Freeman et al. 2011, Sakhaee-Pour and Bryant 2012, Chen et al. 2015, they fail to describe gas flow process in nanopores in detail. In this paper, we present an innovative methodology for estimating apparent gas permeability of shales by coupling multiscale flow mechanisms. The Lattice Boltzmann Method (LBM) with effective viscosity and a general second-order boundary condition is used to analyze the various flow regimes involved in the single microchannel. The desirable agreement between the simulation results and that from the DSMC studies for the rarefied flow prompts the application of the derived correction factor for estimating permeability of shale gas reservoirs. In order to realize this, the porous medium is represented by a bundle of capillaries with diameters determined by mercury injection capillary pressure (MICP) curves. The porous flow is simulated by Darcy's law with derived correction factor; the surface diffusion of adsorption gas in kerogen pores is simulated based on Langmuir model and Fick's law. An extensive integration based on fractal dimension is performed to estimate the total flow rate and thereby the apparent permeability of typical shale samples. MICP and a transient pressure pulse technique are employed on 7 shale samples to obtain the pore size distribution and permeability. The result shows that the estimated gas permeability matches well with the measured permeability with a 20% variation, indicating that the physics based model presented in this paper is highly effective in predicting gas permeability of tight formations, such as the shales.

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A Review of Mercury Porosimetry

Cited by 26 publications

References 31 publications

Validation of a Hybrid “Two-Site Gamma” Model for Naphthalene Desorption Kinetics

Validation of a Hybrid “Two-Site Gamma” Model for Naphthalene Desorption Kinetics

Research on Pore-Fracture Structure Alteration and Gas Emission Homogenization in an Outburst Coal Seam Induced by CO₂ Gas Fracturing

An Innovative Technique for Estimation of Permeability of Shale Gas Reservoirs

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A Review of Mercury Porosimetry

Cited by 26 publications

References 31 publications

Validation of a Hybrid “Two-Site Gamma” Model for Naphthalene Desorption Kinetics

Validation of a Hybrid “Two-Site Gamma” Model for Naphthalene Desorption Kinetics

Research on Pore-Fracture Structure Alteration and Gas Emission Homogenization in an Outburst Coal Seam Induced by CO2 Gas Fracturing

An Innovative Technique for Estimation of Permeability of Shale Gas Reservoirs

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Research on Pore-Fracture Structure Alteration and Gas Emission Homogenization in an Outburst Coal Seam Induced by CO₂ Gas Fracturing