Injection of optimized chemistry water in enhanced oil recovery (EOR) has gained much interest in the past few years. Crude oil-water interfaces can have a viscoelastic character affected by the adsorption of amphiphilic molecules. The brine concentration as well as surfactants may strongly affect the fluid-fluid interfacial viscoelasticity. In this work we investigate interfacial viscoelastici...

Although thermal methods have been popular and successfully applied in heavy oil recovery, they are often found to be uneconomic or impractical. Therefore, alternative production protocols are being actively pursued and interesting options include water injection and polymer flooding. Indeed, such techniques have been successfully tested in recent laboratory investigations, where X-ray scans pe...

Asphaltene deposition in the pore-throats of reservoir rock reduces permeability, which leads to a reduction oil production. The amount deposited asphaltene is generally expressed by an equation that sums three types deposition: surface deposition, pore-throat plugging, and entrainment asphaltene. plugging accelerated increase asphaltene, termed snow-ball effect. Wang Civan's model commonly use...

Various energy recovery, storage, conversion and environmental operations may involve repetitive fluid injection thus, cyclic drainage–imbibition processes. We conducted an experimental study for which polydimethylsiloxane (PDMS)-based micromodels were fabricated with three different levels of pore-space heterogeneity (coefficient variation, where COV = 0, 0.25 0.5) to represent consolidated an...

• An active learning framework is proposed for accelerating concurrent multiscale (FE2) analysis. Gaussian Process (GP) surrogates are constructed online without the need offline sampling. Data collected from a small number of full-order anchor models weakly associated with macroscopic integration points. Greedy sampling based on predictive variance GP used to minimize full model computations. ...

1. Short summary of results of the original research (extended summary see below) At this moment (1 September 2001), about two third of the research period are completed. In accordance with the work plan, the focus has been on theoretical model building in the first two years and will shift to empirical testing and publication of research results in the third year. Articles based on the researc...

Predictive microbial models generally rely on the growth of bacteria in laboratory broth to approximate the microbial growth kinetics expected to take place in actual foods under identical environmental conditions. Sigmoidal functions such as the Gompertz or logistics equation accurately model the typical microbial growth curve from the lag to the stationary phase and provide the mathematical b...

The mobilization of the trapped residual oil is an important part of Enhanced Oil Recovery. The desaturation of nonwetting fluids from porous media is often described using capillary numbers which are a ratio of viscous forces over the capillary forces between the wetting and the nonwetting fluids. Twodimensional microfluidic devices (micromodels) play an important role as they allow for the vi...

When nonwetting fluid displaces wetting fluid in a porous rock many rapid pore-scale displacement events occur. These events are often referred to as Haines jumps and any drainage process in porous media is an ensemble of such events. However, the relevance of Haines jumps for larger scale models is often questioned. A common counter argument is that the high fluid velocities caused by a Haines...

The thermal inactivation of Salmonella enteritidis phage type 4 and Escherichia coli O157:H7 as affected by temperature (54.5-64.5 degrees C), pH (4.2-9.6 with HCl or NaOH) and NaCl concentration (0.5-8.5% w/w) was studied. Cell suspensions in modified tryptone soya broth were heated in a submerged-coil heating apparatus and survivors were enumerated on tryptone soya agar incubated aerobically....