Abstract:

Further experimental studies have been made on the viscoelastic effect of retained polymer molecules based on the results reported in Reference (1).The exponential correlation between velocity and time has been found in the pressure draw-down process.Pressure duildup tests have also been conducted and the same correlation has been shown. The definition of the additional residual effect factor in Reference (1) has been modified and redefined as viscoelastic effect coefficient(α)of retained polymer molecules. Comparison has been made between a for the two processes. The effluent concentration data have shown that the physical model for describing the viscoelastic effect mechanism and the comformation changes of the retained polymer molecules is reliable.

Key words: Porous media, Polymer, Viscoelastic effet