Effect\nof PEO-PPO-ph-PPO-PEO and PPO-PEO-ph-PEO-PPO\non the Rheological and EOR Properties of Polymer Solutions

Abstract

The\nrheological properties of partially hydrolyzed polyacrylamide\n(HPAM) and PEO-PPO-ph-PPO-PEO (BPE) or PPO-PEO-ph-PEO-PPO (BEP) block\npolyether solutions are investigated here. Another hydrophobically\nassociating polymer (HMPAM) is chosen as a contrast. The rheological\nresults show that the elastic modulus (G′) and viscous modulus\n(G″) of HPAM/BPE and HPAM/BEP solutions first increase then\ndecrease, while the viscosities of HMPAM/BPE and HMPAM/BEP solutions\ndecrease with the increase of block polyether concentration. The HPAM/BPE\nsolution has a larger viscosity than HPAM/BEP, while the HMPAM/BPE\nsolution has a lower viscosity than HMPAM/BEP. The polymer solutions\ncontaining BEP have larger G′ and G″ values than the\nsolutions with BPE. Furthermore, the block polyethers reduce the sensitivity\nof viscosity to temperature. BEP is more effective to stabilize the\nviscoelastic property and improve the temperature resistance than\nBPE in HMPAM system. BEP has a better property to enhance the salt\ntolerance of the polymer solution than BPE. Moreover, the enhanced\noil recovery (EOR) experiments show that HPAM/block polyether mixed\nsolution has a larger oil recovery than HPAM, and HPAM/BEP system\nhas a larger enhanced effect than HPAM/BPE solution.