Molecular simulation of hydrophobically associated drag reduction agents
LIU Qing-wang1, GUO Hao1, FAN Zhen-zhong1, QIAN Li-qing1, WEI Xiao-ming2, LIU Zhi-yuan3
1. School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China; 2. National Energy Research and Development Center of Heavy Oil, Panjin 124000, China; 3. Oil Production Plant No. 2, PetroChina Daqing Oilfield Company, Daqing 163000, China
Abstract: The solution models for non-ionic hydrophobically modified polyacrylamide (HM-PAM),partially hydrolyzed hydrophobically associating water-soluble polyacrylamide (HAWSP) and partially hydrolyzed anionic polyacrylamide (HPAM) are established respectively by molecular simulation software Materials Studio 2017 R2.The radius of gyration (Rg) and mean square displacement (MSD) of HPAM,HAWSP and HM-PAM polymers at different NaCl concentrations are calculated by molecular dynamics simulation.Compared with HM-PAM and HPAM,HAWSP has bigger gyration radius,bigger intrinsic viscosity and bigger hydrodynamic dimension,and can bring about better drag reduction effect.The drag reduction properties of HPAM,HAWSP and HM-PAM under different NaCl concentrations and shear conditions are measured by flow resistance tester in laboratory.The experimental results indicate that HAWSP has good drag reduction effect and exhibits better salt tolerance and shear resistance than HPAM and HPAM,which is consistent with the simulation results.
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