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| Molecular simulation of viscosity-increasing mechanism for polymer/PPG particle suspension flooding system |
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JIANG Zuming1, SHI Jing1, YUAN Fuqing1, QI Kai2, HAO Xishun2, LI Zhen2, YAN Youguo2
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(1.Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China;2.School of Materials Science and Engineering in China University of Petroleum (East China), Qingdao 266580, China)
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| Abstract: |
| The viscosity-increasing properties of the polymer HPAM/PPG particle suspension flooding system were investigated from the atomic and molecular level using molecular dynamics simulation. It is found that under same total mass concentration, the system could rovide higher viscosity when the mass concentration of polymer HPAM increases.Polymer HPAM has a larger gyration radius and form more crosslinking, which results in higher spatial viscosity. The hydrodynamic viscosity-increasing could be achieved from the strong interaction between polymer and water phase. There are more water molecules in the hydration layer formed by —COO-, which is easier to form form hydration layer and more stable. And this contributes more to the hydrodynamic viscosity. The contribution of hydrophilic groups of polymer HPAM to hydrodynamic viscosity is greater than that of PPG particles. |
| Key words: polymer PPG particle suspension flooding system viscosity molecular dynamics simulation |
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