Asphaltene multilayer growth in porous medium probed by SANS |
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Authors: | J Gummel Y Corvis J Jestin J M’Hamdi and L Barré |
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Institution: | (1) Institut Fran?ais du Pétrole (IFP), 1&4 avenue du Bois-Préau, 92852 Rueil-Malmaison, France;(2) Laboratoire Léon Brilllouin, CEA/CNRS, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France |
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Abstract: | Presence of suspended particles such as asphaltene in crude oils
could significantly affect the production by means of deposition in porous
media especially near the well bore. We investigate this phenomenon using
the ability of Small Angle Neutron Scattering technique to probe directly
the asphaltene adsorption process in a porous medium at the nanometer length
scale under flow conditions. A device based on a quartz tube filled with SiC
particles constitute the porous medium in which an asphaltene solution in a
mixture of good (toluene)/bad (heptane) solvent is injected under
controlled flow. The contrast matching technique enables to match the porous
medium scattering contributions and to measure the signal of the deposit.
Such a device can be used for curves surface measurements on a setup
originally designed for bulk studies and permit thus the direct comparison
with measurements on flat surfaces (neutron reflectivity) and indirect
adsorption measurements (adsorption isotherm). We show here that asphaltene
in good solvent leads to a monolayer whereas addition of bad solvent results
in a multilayer growth which is consistent with the deposition behaviour
described in the literature. |
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