000 02235nab a2200241 4500
005 20260523200516.0
008 260224s2012 xxu ing
041 _aInglés
100 1 _aAvendano, J.
_953091
100 1 _aPannacci, N.
_953092
100 1 _aHerzhaft, B.
_912653
100 1 _aGateau, P.
_934830
100 1 _aCoussot, P.
_933444
245 0 0 _aNormal Stresses and Interface Displacement
_bInfluence of Viscoelasticity on Enhanced Oil Recovery Efficiency
260 _cnov./dic. 2012
270 _a03/05/2013 ; 03/05/2013
300 _a9 p. ; 921-930
520 _aTraducción del resúmen del autor: One of chemical Enhanced Oil Recovery (EOR) methods consists in injecting aqueous solutions of polymers into the reservoir in order to improve mobility ratio between the injected fluid and the remaining oil. This "polymer flooding" process is usually only characterized with the low shear viscosity of the injected fluid, even if these aqueous solutions are strongly shear thinning and may show high elastic properties evidenced by normal stresses appearance. In order to study the mechanisms at the interface level, we develop simple model experimentations with the goal of quantifying the influence of viscoelastic properties on fluid displacement in a simple geometry. For this purpose, we propose and characterize a model fluid formulation, for which elastic and viscous effects can be tuned systematically. We study then the displacement of a viscous oil by a Newtonian non elastic, a viscoelastic or a purely shear thinning fluid in a two dimensional flow cell. Observing the shape of the interface between aqueous fluids and displaced oil permits to appreciate viscoelasticity effects on the displacement. Using model geometries and controlled rheology fluids, we show that viscoelastic fluids tend to better displace immiscible liquids than Newtonian fluids and that those effects are closely related to the apparitions of normal stresses independently of shear thinning property or variation of interfacial tension as soon as viscous effects govern the flow.
581 _a6
773 0 _tOil and Gas Science and Technology
_g67
942 _cARTICULO
_2ddc
999 _c187651
_d187651