...Wenyu Zhao; Hyun Woong Jang; Daoyong Yang Summary One frequently used enhanced heavy oil recovery technique is gas injection, during which heavy oil viscosity is reduced due to diffusion of gaseous components and heavy oil swelling in porous media. Effective diffusivities of gas components...

... in this study includes the mathematical derivation of the diffusion time required for the imposed pore‐pressure difference to dissipate while also considering the effects caused by the temperature changes, mudcake, and swabbing. The work uses different approaches for fluid modeling in a transient manner during...

... and Hite ( 2008 ) proposed a new method for estimating average reservoir pressure that applies to heterogeneous reservoirs and only requires knowledge of the pressure-buildup data. The Crump and Hite ( 2008 ) method relies on obtaining the first few eigenvalues of a diffusion equation to predict average...

... Raghavan SPE Reservoir Evaluation Artificial Intelligence Upstream Oil & Gas diffusivity matrix transient dual-porosity model fracture permeability horizontal well wellbore-storage coefficient inner reservoir december 2011 hydraulic fracture reservoir approximation Production...

...Jiansheng Chen; Songhua Chen Summary A new mixing rule is described for the prediction of the self diffusivities of gas- and liquid-hydrocarbon molecules in methane/oil mixtures. Unlike macroscopic fluid properties, such as density and viscosity, molecular self diffusivity is a microscopic...

...D. Di Rosa; A. Gyllensten; S. Chen; W. Li; D. Georgi; R. Tauk Summary This paper reports on a successful example of using the 2D NMR technique for determining oil-water contact (OWC) in difficult carbonate environments. An NMR diffusion-based interpretation method was used to identify oil, water...

... and water transport within a coal matrix is presented. Further, various factors influencing gas diffusion through the coal matrix will be highlighted as well, such as pore structure, concentration and pressure, and water effects. An ongoing bottleneck for evaluating total mass transport rate is developing...