Rock-Fluid Evaluation in Presence of Polymer Formulations through Displacement Test in Heavy Oil Porous Media
In the fluid flow study of polymer solutions through porous media in chemical enhanced oil recovery (ChemEOR)
it is important to take into account properties such as polymer adsorption on mineral substrates, residual resistance factor (Rk),
resistance factor (Rm), rock wettability and recovery factor. For these reasons, this study has as main objective to evaluate
rock-fluid behavior in presence of polymeric formulations by coreflood tests in porous media at extra-heavy crude reservoir
conditions. To do this, an experimental methodology was proposed and a range of concentrations (800, 1500 and 2000 ppm)
was established as the main variable of this study. Subsequently, relative permeability curves (Kr) on real sand cores were
generated with an absolute permeability of 7486.60 mD. Resulting in endpoints of the area of interest of: 29.0% and 65.6% of
Swirr (Irreducible water saturation) and Sor (Residual oil saturation) respectively and a primary recovery factor of 36.4%. The
amount of polymer adsorbed under dynamic regime was 19.1, 124.1 and 136.9 ug polymer/g rock. Following the same order,
the values of additional oil recovery factor under polymer injection were 5.4, 10.2 and 15.2%, indicating a proportional
increase with respect to injected concentration. However, there was no apparent correlation between the polymer
concentration and residual resistance factor. Finally, using a methodology developed in this study, recycled polymer produced
efficient results in ChemEOR processes generating an additional recovery factor of 2.38%. It also reduced the mobility of
water in 98% (of that reported initially) and lastly its injection proportion per volume of crude produced was 3.522.
Keywords - Adsorption, Polymer Formulations, , Relative Permeability Curves (Kr),Testing Displacement, Wettability.