Synthesis and Molecular Dynamics Simulation of Amphiphilic Low Molecular Weight Polymer Viscosity Reducer for Heavy Oil Cold Recovery

Chao Ma, Xingyu Liu, Longlong Xie, Yan Chen, Wendong Ren, Wen Gu, Minghua Zhang and Huili Zhou
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Chao Ma: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
Xingyu Liu: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
Longlong Xie: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
Yan Chen: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
Wendong Ren: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
Wen Gu: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
Minghua Zhang: State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
Huili Zhou: Wuhan Changde Energy Technology Co., Ltd., Wuhan 430100, China

Energies, 2021, vol. 14, issue 21, 1-14

Abstract: In order to reduce the viscosity of heavy oil, the performance of emulsifying viscosity reducers is limited. In this study, a new kind of amphiphilic low molecular weight viscosity reducer was prepared by emulsion copolymerization of acrylamide (AM), acrylic acid (AA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and Butene benzene (PB). The synthesis feasibility and viscosity reduction mechanism of viscosity reducer in heavy oil were explored using Materials Studio software from the perspective of molecular dynamics. The results of the molecular dynamics simulation revealed that the addition of viscosity reducer into heavy oil varied the potential energy, non-potential energy, density and hydrogen bond distribution of heavy oil. Benefiting from its structure, the benzene ring in PB was well embedded in the interlayer structure of asphaltene, contributing to weaken the network structure of the heavy oil. Moreover, the two strong polar groups (COO − and SO 3 − ) of AA and AMPS, which constituted the branched chains of the viscosity reducer’s molecular structure, gradually disassembled the network structure from the ‘inward’ to the ‘outward’ of the heavy oil network structure, thereby driving heavy oil viscosity reduction (as clarified by molecular dynamics). Owing to its temperature resistance, this kind of new amphiphilic low molecular copolymer could be an effective viscosity reducer for heavy oil cold recovery at elevated temperatures.

Keywords: molecular dynamics simulation; amphiphilic polymers; hydrophobic monomer; viscosity reduction of heavy oil; viscosity reduction mechanism (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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