... engineering differential equation analysis wellbore fracturing fluid shale gas equation conference compressibility relative permeability spe reservoir evaluation diffusivity figure technical conference journal technology conference Introduction Region 3. For single-phase oil in SRV...

... Abstract During gas injection in ultra-tight fractured reservoirs, molecular diffusion can play a dominant role in the mass transfer process and enhance recovery by extracting oil components from matrix and delaying gas breakthrough. There has been a growing interest from scholars and operators...

...Methods This section describes the conceptual model and presents the diffusion-based model for mass transport through the ultratight matrix. Conceptual model Abstract The complex pore structure and storage mechanism of shales make the mass transport in these ultratight reservoirs...

... of sedimentary rocks is described by the PNP equations. The PNP equations state that the local change of concentration of ions is a consequence of the drift and diffusion current fluxes as (5) q ∂ c i o n ∂ t + ∇ ⋅ ( J d i f t i s i o n , j o n + J d r i f...

... model lateral length assumption correlation delaware basin operator strategic decision complex reservoir upstream oil & gas stage length pressure drop fracture equation reservoir simulation unconventional resource economics diffusivity wolfcamp enhanced frac region model society...

... coefficient heavy oil reservoir enhanced recovery SAGD concentration das diffusion coefficient production control Artificial Intelligence Upstream Oil & Gas bitumen operation production monitoring production logging solvent concentration spe annual technical conference application...

... Here D m is the diffusivity of a gas into liquid that depends on temperature ( T ), liquid viscosity ( μ ) and particle size of the gas ( r p ); and k B is Boltzmann's constant. The order of magnitude of diffusivity-values predicted from those correlations are acceptable for most gas...

... inhibitor wax remediation wax inhibition asphaltene remediation remediation of hydrates PIB deposit mass diffusivity temperature difference concentration difference flow assurance oilfield chemistry scale inhibition deposition experiment cold finger paraffin inhibitor operating condition...

... The time-span of experiments is very long (order of several days to few months). In other words, it takes long time to achieve equilibrium/steady state to determine diffusivity; The parameter inversion in literature ([ 34 ]-[ 39 ], [ 41 ]-[ 43 ]) is based on error function type solution...

... Abstract Solubility and diffusivity of gases in heavy oil, respectively quantified by Henry's constant ( H ij ) and diffusion coefficient ( D ), are essential properties for the design of recovery processes that require the injection of gas or vapour solvents into the reservoir. Data, obtained...

... Abstract Molecular diffusion plays a very important role in various reservoir processes; especially in the oil recovery processes where convective forces are not dominant or when direct frontal contact and mixing is not possible. For example, in heavy oil and bitumen recovery, injected light...

... Abstract Shale and tight gas reservoirs are characterized by very low permeabilities at the nano-scale which gives rise to non-Darcy effects such as Knudsen diffusion that makes the use of conventional (Darcy) models inadequate. Slip-flow and Knudsen diffusion have been shown to be accounted...

... the measurement and modeling of the diffusivity and interface mass transfer coefficients for those gas-liquid systems. The experimental data were obtained with accurate PVT measurements, under high pressure and high temperature conditions. The tests were carried out in the 70°C through 120°C temperature range...

... at any given ξ, T i at the interface, and α is the effective thermal diffusivity of the reservoir material inside the interface. For the above case the variable of integration can be changed from dξto a more convenient dT using Equation 2 , as v is a direct function of T, as below: (3) − d...

... on the significance of microscale diffusion on flow behavior over time. Pore throat diameters on the order of nanometers are known to result in non-Darcy flow conditions, which can be accounted for using the dusty-gas model coupled with various models for diffusivity estimation. This phenomenon is related...

...Statement of Theory and Mathematical Model In order to evaluate the diffusion coefficient and solubility value for each step of experiment, an appropriate mathematical model was developed such that the measured dissolution rate is theoretically related to these two parameters. In order to do...

... the following definitions of dimensionless fracture and reservoir conductivities, respectively: (13) C F D = k F w F k I x F and (14) C R D = k I x F k O y e . We also define the following diffusivity ratios: (15) η F D...

... bitumen Upstream Oil & Gas diffusivity oil sand complex reservoir Engineering prediction thermal method SAGD infinite dilution vigne thermodynamic factor enhanced recovery steam-assisted gravity drainage concentration diffusion process coefficient correlation mutual...

...Introduction Molecule diffusion occurs due to the concentration gradient (ordinary diffusion), the pressure gradient (pressure diffusion), the thermal gradient (thermal diffusion), unequal external forces (forced diffusion), or Brownian motion (self-diffusion) ( Bird et al., 1960...

... Abstract Graphical methods are important tools in estimation of the diffusion coefficient as well as identifying various stages involved in the ordinary diffusion. In this work, graphical methods were used for the estimation of diffusion coefficient of gases in highly-viscous oil-sands bitumens...