Scale effect on porosity and permeability: Kinetics, model, and correlation

Self Cite

107

Particle migration and deposition, and resulting permeability impairment occurring in porous media are described by a practical phenomenological model considering temperature variation and particle transport by advection and dispersion. Variation of the filter coefficient and permeability of porous matrix by temperature and particle deposition, and other essential factors are considered by means of the special correlations of the relevant variables and dimensionless numbers. Comparison of the numerical results, obtained using a finite-difference numerical scheme with and without considering the dispersion mechanism and temperature variation, reveals the significance of such effects on fines migration and deposition, and consequent permeability impairment in porous media. Improved model presented in this article can be instrumental for scientifically guided experimentation, analysis, and optimal design of processes involving in transport of colloidal and fine particles through geological subsurface formations.

Section: Superscripts O Initial Condition 1 Introductionmentioning

confidence: 96%

Section: Superscripts O Initial Condition 1 Introductionmentioning

confidence: 99%

Non-isothermal Permeability Impairment by Fines Migration and Deposition in Porous Media including Dispersive Transport

Civan

2010

Self Cite

107

“…where φ is the effective porosity of the porous medium excluding the pore volume occupied by the irreducible fluids and n is an exponent, which can be related to a fractal dimension (Civan 2001(Civan , 2002, but often taken as n = 1.0 (Dupuit 1863). The symbol u f denotes the volume of fluid passing through porous media expressed per unit bulk surface area and per unit time, referred to as the volumetric flux or superficial velocity.…”

Section: Formulationmentioning

confidence: 99%

Temperature Effect on Power for Particle Detachment from Pore Wall Described by an Arrhenius-Type Equation

Civan

2006

Self Cite

“…The power-law model proposed by Civan (2001) is used to describe the variation of the local absolute permeability…”

Section: Absolute Permeability Modelmentioning

confidence: 99%

The Experimental and Numerical Studies on Gas Production from Hydrate Reservoir by Depressurization

Bai

Zhao

et al. 2009

A set of experimental system to study hydrate dissociation in porous media is built and some experiments on hydrate dissociation by depressurization are carried out. A mathematical model is developed to simulate the hydrate dissociation by depressurization in hydrate-bearing porous media. The model can be used to analyze the effects of the flow of multiphase fluids, the kinetic process and endothermic process of hydrate dissociation, ice-water phase equilibrium, the variation of permeability, convection and conduction on the hydrate dissociation, and gas and water productions. The numerical results agree well with the experimental results, which validate our mathematical model. For a 3-D hydrate reservoir of Class 3, the evolutions of pressure, temperature, and saturations are elucidated and the effects of some main parameters on gas and water rates are analyzed. Numerical results show that gas can be produced effectively from hydrate reservoir in the first stage of depressurization. Then, methods such as thermal stimulation or inhibitor injection should be considered due to the energy deficiency of formation energy. The numerical results for 3-D hydrate reservoir of Class 1 show that the overlying gas hydrate zone can apparently enhance gas rate and prolong life span of gas reservoir.