Study of the Mechanism of Polymer Solution With Visco-Elastic Behavior Increasing Microscopic Oil Displacement Efficiency and the Forming of Steady "Oil Thread" Flow Channels

3D image-based characterization of fluid displacement in a Berea core

“…This provides both visual and quantitative confirmation of the mobilization of residual oil by the gel from upstream of the imaged region. Such mobilization has been described previously [45] and is believed to be produced by the injection of the non-Newtonian fluid (gel). The effects of the gel on residual fluid distributions can be seen by comparing the s wr distribution with that of gels wr and s or with that of gels or .…”

Effect of porous media properties on the onset of polymer extensional viscosity

“…Generally after primary and secondary stages of oil recovery, only 30-40% of initial oil in place will be recovered and large amount of oil will remain in reservoir. Thereby, as the third stage of field development, several techniques are proposed which Seright et al, 2009) recently some experimental results (Urbissinova et al, 2010) along with numerical studies (Afsharpoor and Balhoff, 2013;Bai et al, 2011;Xia et al, 2008) and CT image visualization (Hou et al, 2009;Meybodi et al, 2011) demonstrated that in some cases, the polymer can also mobilize the trapped oil (Bakhitov et al, 1980;Cheng et al, 2010;Sherbone et al, 1967;Wang et al, 2001b;Wu et al, 2007). Several reasons are proposed to explain this observation such as polymer adsorption Kohler, 1987, 1988), viscoelastic effect (Huifen et al, 2004;Wang et al, 2000Wang et al, , 2001aWang et al, , 2001bWu et al, 2007), shear thickening (Delshad et al, 2008;Jones, 1980) and memory effect (Hossain et al, 2009).…”

Mechanistic Simulation Studies on Viscous-Elastic Polymer Flooding in Petroleum Reservoirs

“…[2,3] Many studies have shown that the polymer flooding also can improve microscopic-oil displacement efficiency due to the viscoelastic properties of polymer solution. [4,5] What is more, the viscoelastic property induces the polymer solution to present nonlinear flow, and it is not just a simple type of shear thinning fluid.…”