Studies of transport of asphaltenes through porous membranes: statistical structural models and continuum hydrodynamic theories

Asphalt flocculation and deposition: I. The onset of precipitation

“…Previously, limited data of the type we present here were given by Mitchell and Speight (19731, Hotier and Robin (19831, Hirschberg et al (19841, and Speight et al (19851. In sequels to this article we shall study the kinetic growth of asphalt and asphaltene aggregates, their phase behavior in immiscible and miscible displacements and at elevated temperatures and pressures, and their flow and its effect on the permeability of a porous medium. Their transport properties, such as their effective diffusivity in a pore, have been reported elsewhere (Ravi-Kumar et al, 1994).…”

Asphalt flocculation and deposition: II. Formation and growth of fractal aggregates

“…The model has important implications for several structural and dynamical properties of the aggregates, which we discuss in detail. Effective diffusivities of asphalt aggregates in a pore have been reported elsewhere (Ravi-Kumar et al, 1994).…”

Modelling of wax deposition by perturbed hard sphere chain equation of state

“…The increasing demand for oil leads to the exploration and production of oil in locations with harsher and colder environment such as subsea fields or the areas with extremely low temperatures [1]. The production of oil at inclement conditions may lead to the formation of wax which is a mixture of alkanes usually in a homologous series * of chain lengths [2][3][4]. Heavy hydrocarbons (C16-C70+) begin to precipitate at temperatures lower than wax appearance temperature (WAT) or cloud point [5].…”

“…The three pure component parameters of PHSC EoS are V*, A* and E* defined as follows: * = ( /6)3 (A.6) * = * = ( / ) (A.8)…”