... Abstract This study introduces a one-dimensional, numerical, anomalous diffusion model for three-phase flow of oil-water-gas in a porous medium. We particularly address the current lack of understanding of gas-liquid anomalous diffusion and its impact on production from unconventional...

... throat size, and displacing velocity), and the diffusion term (governed by bulk fluid diffusivity and matrix tortuosity). Previous studies suggest that within nanoscale porous media, diffusion can be the dominant drive mechanism. In this study, we investigate the impact of diffusion on gas injection...

... and low water and gas mobilities over a wide range of saturations are discussed. The impact of diffusion on hydrogen injectivity and deliverability is also demonstrated. Results show an increase in methane concentration and a decrease in hydrogen concentration due to microbial activity, including...

... proposed previously in the technical literature because it integrates the effects of fractality, present in the stimulated reservoir volume (SRV), triple-porosity, slip and viscous flow, Knudsen diffusion, kerogen adsorption/desorption from the organic pore walls, geomechanics effects, anisotropy...

...URTeC: 5680 Effects of Molecular Level Forces on the Diffusivity Characteristics of Hydrocarbons in Shale Reservoirs Yakup Coskuner*1, Xiaolong Yin1, Erdal Ozkan1, 1. Colorado School of Mines. Copyright 2021, Unconventional Resources Technology Conference (URTeC) DOI 10.15530/urtec-2021-5680...

... treatment, we investigated the diffusion of OH - , H + , hydrogen peroxide (H 2 O 2 ), and Sodium hypochlorite (NaOCl) into untreated brine and monitored the contact-angle variations. The results suggest that H 2 O 2 and OH - are responsible for the stronger brine wetting characteristics, and NaOCl and H...

... that, for heterogeneous samples containing pre-existing weak layers, the injection can be diffusion dominated, or cause hydraulic fracture branching, or result in bi-wing hydraulic fracture structure, depending on the injection parameters. For homogeneous samples without pre-existing weak layers, the regime of hydraulic...

... production monitoring flow in porous media hydraulic fracturing reservoir simulation upstream oil & gas fluid dynamics carbon dioxide srinivasan & viswanathan pore diffusion mehana matrix conventional reservoir viswanathan hydrocarbon reservoir fracturing fluid permeability...

... that diffusion can be a dominant transport mechanism in EOR in nanoporous media. Surface area and diffusion length govern diffusion efficiency. While surface area strongly depends on fracture density (natural and induced) and drawdown history; diffusion length is a function of fluid diffusion and matrix...

... in nanoporous shale. A new UGF model is proposed to describe the gas flow behavior in the entire Kn regime, considering the effects of advection, gas slippage, bulk diffusion, Knudsen diffusion and cross-sectional geometry. To predict the velocity profile in high Kn flow regime, the boundary condition...

... Abstract The transport of methane in shale is complicated by the heterogeneous pore structure, inhomogeneous surface properties arising from complex mineralogy, and the presence of adsorbed/bound water. With such complexities, the contribution of advection and diffusion to the transport...

... fluid modeling production control flow in porous media complex reservoir shale matrix diffusion unit matrix block reservoir characterization artificial intelligence equation of state fluid dynamics heterogeneous model fracture production monitoring shale gas reservoir simulation...

... Abstract This paper presents a mechanistic simulation study of one-dimensional diffusion when the miscible injectant diffuses into a tight porous medium through the fracture/matrix interface with constant pore volume and temperature. The diffusion model based on the dusty gas model gives...

... (DDA) concept in order to constrain the reservoir matrix and hydraulic fracture property estimates. The mechanisms of salt mixing, dispersion/diffusion and advection are captured in the salt-transport model. In previous work, an integrated model comprised of the following components was developed: 1...

... comprises the pore-scale modeling of relevant diagenetic events, considering physical and chemical processes such as advection, diffusion and reactive transport. Fig. 1 shows a summary of the integrated framework followed in this study. A description of the components of each stage is presented next. Figure...

... Abstract The dominant transient flow regime for multi-fractured horizontal wells producing from low-permeability and shale (unconventional) reservoirs has historically been interpreted to be transient linear flow (TLF) in the framework of classical diffusion (CD). Recently, observed...

... flow in porous media Upstream Oil & Gas Modeling & Simulation Fluid Dynamics gas production diffusion mechanism water recovery hydraulic fracturing water blockage gas flow base case secondary fracture fracture closure fracture secondary fracture closure hydraulic fracture...

... Abstract Molecular diffusion is an important mass transport mechanism for gas production from shale reservoirs. Characterization of matrix diffusivity is fundamental to understand the recovery from shale gas plays. By micro-computed tomography (micro-CT) imaging of X-ray dense and transparent...

... Summary Flow mechanisms are complex in the tight shale porous matrix due to the multi-physics affecting fluid flow: the geomechanical effect, slip flow/diffusion and adsorption/desorption. The multi-physics make it difficult to obtain a deep understanding of flow mechanisms and production...

... size distribution in shale formations is stretched down to nano-meters, the system response violates the predictions of Darcy's law. Depending on pore size and gas properties, non-Darcy flow mechanisms such as slip-flow, molecular diffusion, and Knudsen diffusion can affect the matrix deliverability...