Relationship between porosity and permeability with stress using pore volume compressibility characteristic of reservoir rocks

Moosavi, Seyed Amin; Goshtasbi, Kamran; Kazemzadeh, Ezatallah; Bakhtiari, Hesam Aloki; Esfahani, Mohammad Reza; vali, jafar

doi:10.1007/s12517-012-0760-x

Cited by 40 publications

(22 citation statements)

References 22 publications

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“…The results by Wei et al (2011) revealed that at the stage of elastic deformation of the rock, the axial deformation dominates the change of rock permeability, and throughout plastic deformation, the growth rate of the permeability was significantly greater than that of the elastic stage. Moosavi et al (2012) implemented porosity-stress and porosity-permeability formulations which were in good agreement with the experimental data and illustrated that permeability decreases as the effective stress increases. Almost in all studies, exponential (Dong et al 2010;David et al 1994;Evans et al 1997) and power law equations (Ghabezloo et al 2009;Dong et al 2010;Shi and Wang 1986;Morrow et al 1984) were developed to relate stress and permeability.…”

Section: Introductionmentioning

confidence: 62%

“…Further in this research, whenever the mechanical model is not mentioned, it indicates the results are presented for thermo-poroelastic concept without damage model and is named as case (I) while the FSD model is addressed as case (II). The equations developed by Bai et al (1994), Moosavi et al (2012), and Ghabezloo et al (2009) are valid within the elastic region, and the one presented by Tang et al (2002) is used to consider permeability changes within the failed area and the elastic zone. Two methods are used to model borehole breakout development in order to cover these conditions.…”

Section: Resultsmentioning

confidence: 99%

“…These equations along with various stress-compressibility correlations (Ostensen 1986;Jones 1998;Liu et al 2009) are used to examine the variations of pore volume with effective stress changes. Moosavi et al (2012) utilized the compressibility correlation developed by Liu et al (2009) and introduced an equation for the changes of rock porosity with stress as follows…”

Section: Stress-dependent Porosity and Permeabilitymentioning

confidence: 99%

“…After stabilization of the borehole breakout, stress values are used to calculate permeability variation. A strain-based stress-permeability model (Bai et al 1997) and two correlations (Moosavi et al 2012) relating stress to porosity and permeability are applied to investigate permeability changes around the borehole. The effects of permeability and rock modulus anisotropy are explored using Weibull distribution and the FSD model.…”

Section: Introductionmentioning

confidence: 99%

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Transient thermo-poroelastic analysis of drilling-induced mechanical damage in nonfractured rocks

2015

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Permeability variations in reservoirs and around boreholes are of great interest in petroleum engineering due to the fact that they can significantly affect reserve estimates, reservoir development, well production or injection rate, and the likely success of remedial actions of near-wellbore damage. A fully coupled transient thermo-poroelastic concept with and without rock mechanical damage models is employed to evaluate stress distribution and permeability variation around the boreholes and breakouts. The anisotropy concept is applied to permeability, rock modulus, and uniaxial compressive strength using Weibull distribution. The Mogi-Coulomb failure criterion is employed to model breakout initiation and propagation around the borehole. Strain-based stress-permeability equation and stress-permeability models based on the experimental results and correlations are used to evaluate permeability changes near the borehole. Two cases of overbalanced and underbalanced drilling conditions are employed. The simulations for medium with isotropic and anisotropic physical properties result in varied effective stress distribution, breakout geometries, and consequently different distributions of tangential and radial permeability. Generally, in isotropic medium, permeability reduces to less than 70 % of its original value in the overbalanced condition and 80 % in underbalanced operations; however, there are differences between permeability along x and y directions. For anisotropic medium, permeability increases to more than 150 % all over the borehole periphery in the overbalanced operations; moreover, permeability enhancement is essentially larger along maximum in situ springline. In the underbalanced condition, permeability decreases to less than 70 % along minimum in situ stress direction and increases to more than 200 % in a limited area near the borehole along maximum in situ stress springline.

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Section: Introductionmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Stress-dependent Porosity and Permeabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transient thermo-poroelastic analysis of drilling-induced mechanical damage in nonfractured rocks

2015

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“…The quantification thereof is discussed in detail by Bear and Cheng (2010) who consider it important as deformation affects the water storage and may result in surface subsidence. This was further evaluated by, for instance, Moosavi et al (2012), who considered the change in porosity due to pore volume compression.…”

Section: Changing Porosity (Consolidation and Swell)mentioning

confidence: 99%

Porosity Reviewed: Quantitative Multi-Disciplinary Understanding, Recent Advances and Applications in Vadose Zone Hydrology

Dippenaar¹

2013

Geotech Geol Eng

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Porosity -one of the most basic mechanical properties of a mediumhas implications in a vast range of disciplines and used for a similar vast range of applications. These include, for instance, the storage and flow of water; the compressible component of earth materials, which can be subjected to consolidation under loading; the variable parameter in the swelling and shrinkage of clays; and possibly a governing parameter in the formation of wetlands and perched water tables. This review notes the relevance of a fourfold quantification of porosity for vadose zone studies, viz. (1) type (matrix or structure), (2) scale (submicro to macro scale), (3) connectivity, and (4) water saturation. This is followed by a review of recent advances in the quantification and description of porosity in porous media (visual and remote sensing methods, porosimetry, geometrical approaches, empirical estimations, densest packing simulations, etc.), the applications to quantification of hydrological parameters, and a brief glimpse into the significance of porosity in a temporary hillslope wetland underlain by Archaean Lanseria gneiss in South Africa. Final comments are made regarding areas where quantification of porosity is problematic.Keywords: porosity; void ratio; vadose zone; effective porosity; fractal; microstructure; porosimetry; ferricrete; temporary hillslope wetland IntroductionAlbeit a straightforward concept (how hard can determining the ratio of voids to solids possibly be?), quantification of porosity is often significantly simplified. The importance of porosity in hydrology as a primary input parameter in almost all subsequent calculations is overlooked and the parameter is estimated without any validation, resulting in significant unquantifiable errors in hydraulic parameters. However, the simple percentage value of porosity is only one such aspect. The importance of type, scale and connectivity of porosity is commonly understood, but rarely evaluated in significant detail.A detailed discussion in Miller and Gray (2002) on the status of groundwater research accentuates a number of aspects requiring more research and where our understanding is often not sufficient. Reference is made particularly to preferential flow paths such as fractures and the resulting complicated accounting of interactions between these fractures and the flow through the primary pore space. They continue to elaborate on the difficulty of accounting for scale ranging from molecular to regional field problems. Fractured systems are singled out due to the difficulty in characterising and modelling fractures with available methods and because of their interaction with the porous matrix.As this is a review paper, basic concepts will be described concisely for the sake of cross-disciplinary agreement. It is impossible to cover the whole range of methods applicable to porosity. The purpose of this paper is primarily to summarise considerations in the quantification of porosity, to review recent advances in the quantification of porosity, to ap...

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Pore structure and fractal analysis of coal subjected to multiple treatments based on nuclear magnetic resonance

Yang

Zhao

Wang

et al. 2022

Energy Science & Engineering

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Microwave heating (MW) and freeze fracturing (FF) have been widely used for enhancing the permeability of coal reservoirs. In this paper, the effects of combined MW-FF treatments on coals are experimentally investigated through nuclear magnetic resonance. T 2 distributions and fractal dimensions of coals under MW, FF, and the combined MW-FF treatments are compared and analyzed. The results show that the T 2 area, porosity, and fractal dimensions of coals increase to varying degrees after MW, FF, and MW-FF treatment. The T 2 spectrum peaks increase from 2 to 3 and macrofractures can be observed after the coal was treated with the combined MW-FF treatments.However, these phenomena are not observed under MW or FF treatment. The combined MW-FF treatments can effectively fracture coals with less microwave energy and less liquid nitrogen freezing cycle owing to its intensive thermal shock fracturing. Therefore, the combined MW-FF treatment is favorable for fracturing the coals and hence favorable for the CBM production.

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Relationship between porosity and permeability with stress using pore volume compressibility characteristic of reservoir rocks

Cited by 40 publications

References 22 publications

Transient thermo-poroelastic analysis of drilling-induced mechanical damage in nonfractured rocks

Transient thermo-poroelastic analysis of drilling-induced mechanical damage in nonfractured rocks

Porosity Reviewed: Quantitative Multi-Disciplinary Understanding, Recent Advances and Applications in Vadose Zone Hydrology

Pore structure and fractal analysis of coal subjected to multiple treatments based on nuclear magnetic resonance

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