Experimental Research on the Quantitative Characterizations of Elasticity and Viscosity of Polyacrylamide Solution

摘要

Through creep-recovery and dynamic experiments,the viscoelasticity of polyacrylamide solutions (in short polymer) with different mass concentration are studied,the proportions of elastic part and viscous part in the polymer solution are calculated and the limit of mass concentration called high concentration polymer solution is given.It is indicated that the elastic part of the polymer solution increases firstly and tends to be constant with the increase in mass concentration under low external force condition.The minimum mass concentration of the polymer solution keeping constant elastic part is 1500mg/L.Under low stress and low shear rate conditions,the viscous part of the polymer solution is greater than that of elastic part; but under oil reservoir shear rate (6.283s1) condition,the elastic part is greater than viscous part,and its elastic part increases with the increase in mass concentrations and the increment becomes smaller.