Heavy Oil Viscosity Molecular Dynamics Simulation And The Preparation Of Nanometer Modified Heavy Oil Viscosity Reduction Agent Process Design

Oil-soluble viscosity dropping agent is a chemical viscosity reduction technology for efficient exploitation and transport of heavy oil. The development potential is huge. In this paper, the method of combining software analysis and experimental study was adopted. Firstly, Materials Studio is used for molecular dynamics simulation to study the viscosity mechanism of heavy oil and the effect of viscosity dropping agent on heavy oil system. Sencondly, the surface of nano-silica was by silane coupling agent (y-methacryloxypropyl trimethoxy silane, KH570), and then with 18 acrylate and maleic acid binary viscosity; 18 acrylate, styrene, maleic anhydride and acrylamide quaternary viscosity agent was prepared from polymerization on the surface nano SSTA/TiO2 composite materials of heavy oil viscosity reduction agent The structure and property of modified nano-silica particles were characterized and analyzed by FTIR, TG and so on. And it was used for Daqing high-wax heavy oil to evaluate its viscosity reduction performance. According to the provision of The determination method of kinematic viscosity and calculation method of dynamic viscosity for petroleum products, the kinematic viscosity of Daqing high-wax heavy oil with and without agent was measured by automatic recording capillary viscometer, and the apparent and net viscosity reduction rates of synthetic nano heavy oil viscosity dropping agent were calculated. The main contents are as follows:(1) Materials Studio is used for molecular dynamics simulation to study the viscosity mechanism of heavy oil and the effect of viscosity dropping agent on heavy oil system. The polymerization reaction energy of viscosity dropping agent with styrene, octadecyl acrylate,maleic anhydride and acrylamide as raw material monomers is much higher than the required energy of breaking double bond, simulate the curve of system temperature, potential energy and total energy with time respectively. The viscosity dropping agent has a great impact on the density of system.(2) The viscosity reduction rate of SM/TiO2 viscosity dropping agent was first increased and then unchanged with increasing the adding amounts of viscosity dropping agent. The optimum adding amount was 400ppm. At 40℃, the apparent viscosity of heavy oil in DaqingTL was reduced from 198.88mm2/s to 83.68mm2/s after adding optimum dose 400 ppm, and the apparent viscosity reduction rate was 57.92% and the net viscosity reduction rate was 24.07%. Qinhuangdao of heavy oil was/s fell to 97.68 from 203.34 was/s, the apparent viscosity rate of 51.96%, net viscosity reduction rate was 15.23%,(3) The viscosity reduction rate of SSTA/TiO2 viscosity dropping agent was first increased and then unchanged with increasing the adding amounts of viscosity dropping agent. The optimum adding amount was 300ppm. At 40℃, the apparent viscosity of heavy oil in DaqingTL was reduced from 198.88mm2/s to 73.68mm2/s after adding optimum dose 300 ppm, and the apparent viscosity reduction rate was 62.95% and the net viscosity reduction rate was 33.14%. The viscosity reduction effect was excellent.