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Alkaline Earth Element Adsorption onto PAA-Coated Magnetic Nanoparticles

In this paper, we present a study on the adsorption of calcium (Ca2+) onto polyacrylic acid-functionalized iron-oxide magnetic nanoparticles (PAA-MNPs) to gain an insight into the adsorption behavior of alkaline earth elements at conditions typical of produced water from hydraulic fracturing. An aqueous co-precipitation method was employed to fabricate iron oxide magnetic nanoparticles, whose surface was first coated with amine and then by PAA. To evaluate the Ca2+ adsorption capacity by PAA-...

Numerical Simulations of the Migration of Fine Particles Through Porous Media

The migration of fine particles (or fines) in an oil formation may cause its damage and decrease the well production rate, as several experimental and modeling studies have shown. The major challenge in the description of fines transport is the prediction of the location where particles are blocked. Classical mathematical models consider the fines as a solute and neglect the mechanism that couples fines transport and the fluid flow, without capturing therefore the single particle motion and b...

PH-dependent transport of metal cations in porous media

We study the effect of pH-dependent adsorption and hydrodynamic dispersion on cation transport through a reactive porous medium with a hydrophilic surface. We investigate how competitive adsorption between a proton and a metal (which in some situations of practical interest may also be a radionuclide) can facilitate the migration of a certain fraction of the latter. We performed laboratory experiments using a chromatographic column filled with silica beads coated with iron oxide and flooded i...

Precipitation of Mg-carbonates at elevated temperature and partial pressure of CO2

In this paper, we present an experimental study on the precipitation of magnesium carbonates (Mg-carbonates) from a solution containing magnesium chloride and sodium carbonate and in the presence of supercritical carbon dioxide. We performed homogeneous (unseeded) batch precipitation experiments at 100bar of CO2 and at 90°C, 120°C, and 150°C. The system was monitored with online temperature and pressure sensors and an online Raman spectroscopy probe. We investigated the effect of temperature ...

Effect of ionic strength on barium transport in porous media

Hydraulic fracturing (or fracking) is a well stimulation technique used to extract resources from a low permeability formation. Currently, the most common application of fracking is for the extraction of oil and gas from shale. During the operation, a large volume of brine, rich in hazardous chemicals, is produced. Spills of brine from wells or pits might negatively impact underground water resources and, in particular, one of the major concerns is the migration of radionuclides, such as radi...

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