ABSTRACT
It is generally considered that polymer solution can
improve the mobility ratio and the macroscopic
sweep efficiency in petroleum engineering field. Re-
cently, by research on the flowing behavior of poly-
mer solution in porous medium, some scholars have
considered that the visco-elasticity of polymer solu-
tion can improve oil displacement efficiency (Wang
et al. 2000, Xia et al. 2001, 2002a, 2004). Xia et al.
(2006) had demonstrated the mechanism of the elas-
ticity of polymer solution effecting on residual oil in
dead end. Zhang et al. (2002, 2004) show the flow
behavior of visco-elastic fluid in the dead end pore.
It is not reported that the effect of the viscosity and
elasticity of polymer solution on cluster-type resi-
dual oil are considered, respectively. Also, it is not
reported that the effect of the visco-elasticity of po-
lymer solution on cluster residual oil is described
quantitatively. It is necessary to research on the ef-
fect of the elasticity of different mass concentration
polymer solutions on residual oil and further to ana-
lyze the effect of high mass concentration polymer
solution on residual oil in flooding process.
