... mass density, ϕ porosity, u Darcy flux, n unit-normal vector pointing out of Ω, x i mole fraction, a i adsorbed component (mol per rock mass), D f free molecular diffusion coefficient, τ tortuosity and C i concentration (mol per gas volume). We apply a standard geomechanics model...

... analysis density difference instability enhanced recovery experiment diffusion coefficient permeability linear stability analysis coefficient growth rate Upstream Oil & Gas concentration profile co 2 simulator amplitude subsurface storage air emission climate change Introduction...

... sorbed in the micro-porosity at time t in mg, M i,∞ being the total amount of gas sorbed in the micro-porosity at infinite time in mg, r i being the micro-pore radius in mm, and D i being the micro-pore diffusion coefficient in mm 2 /s. (1) D r 2 ∂ ∂ r ( r 2...

... experiments, the impact mechanism of fracturing fluid on CBM desorption, diffusion and seepage were analyzed. Results show that both the coalbed methane desorption rate and the diffusion coefficient of samples treated by fracturing fluid decrease compared with that of treated by formation water; compared...

... Abstract Molecular diffusion effect has been ignored in many conventional reservoir studies, but it can play a significant role in tight fractured reservoirs and is crucial for an appropriate reservoir evaluation. We have characterized diffusion coefficients of methane gas in hydrocarbon fluid...

... by Darvish et al. (2006a ) and Trivedi and Babadagli (2008a ) recently. Both studies mentioned here were on different types of rocks. During CO 2 injection into fractures, lighter components having lower diffusion coefficients are produced at early stage and heavier components with higher diffusion...

... to explain the coupling of swelling stress to porosity change in coal as a function of the change in diffusion coefficient, the Langmuir constants, cleat compressibility and material properties. spe 133489 compressibility mechanistic model alternative mechanistic model sorption permeability...

... with respect to the square root of time. An example of such a plot is shown in Fig. 2 . gas release desorption spe 135813 annular pressure drilling air drilling residual gas content diffusion coefficient equation society of petroleum engineers drilling operation coal information core...

... Abstract Laboratory measurements of the diffusion coefficient of CO 2 into brine under both unsteady state and steady state conditions were carried out to obtain the dissolution rates of CO 2 during CO 2 injection and/or flooding in short term and for CO 2 preservation at thermodynamic...

... flux Upstream Oil & Gas coal co 2 diffusion coefficient sorption diffusion equation macromolecular structure viscosity Significance fraction case ii diffusion penetrant Introduction Stress induced diffusion plays an important part in many engineering applications...

... a set of fully coupled linear multi-component diffusion equations in porous media, and thus both the diagonal diffusion coefficients (main term) and their off-diagonal counterparts (cross-term) are all included. Besides, since the present model is developed on the basis of an exact formal solution...

...-interpretation methodology. porosity interpretation transverse relaxation rate diffusion coefficient well logging upstream oil & gas bambang poernomo spe 54338 chuong nguyen saturation carbon oxygen spe 54338 fan chart case study minas field investigation residual oil saturation nuclear...