Hao Xu,Zhongwei Li,Chengyu Wang,Zhengfu Wang,Rongjian Yu,Yebang Tan
A series of amphiphilic copolymers (PIDs) were synthesized through free radical copolymerization of isobutyl acrylate (IBA) with N,N-dimethylacrylamide (DMAA). The structure, composition , and average molecular weights of these copolymers were characterized by 1 H NMR spectra, infrared spectra , elemental analyse, and gel permeation chromatography . The solubility and aggregation behavior of these copolymers in different solvents were studied. In addition, thermo-responsive behavior of water-soluble copolymers in water was investigated by means of transmittance tests and DLS tests. The demulsification experiment showed that PID demulsifiers had excellent demulsification efficiency toward super heavy oil emulsions. The dehydration ratio reached 92.69 % at a concentration of 400 mg·L −1 for 210 min at 80 °C. Combined with the morphological changes of water droplets and active substances during demulsification, the characteristics of viscosity and interfacial activity proved that the higher content of lipophilic segments in PID copolymer could facilitate the diffusion of demulsifiers at the oil-water interface and accelerate the condensation of water droplets. Therefore, it is envisioned that this heavy oil demulsifiers with excellent demulsification performance and clean water phase will have promising prospects.
When applied to extra-heavy oil, conventional polymer surfactants exhibit poor efficacy in reducing viscosity and have limited adaptability. In this work, a novel amphiphilic polymer named PAADB was prepared by incorporating 2-acryloylamino-2-methyl-1-propanesulfonic acid (AMPS), benzyldimethyl [2-[(1-oxoallyl) zoxy] propyl] ammonium chloride (DML), and poly(ethylene glycol) methyl ether acrylate (BEM) into the main chain of acrylamide through free radical polymerization. PAADB exhibited outstanding interfacial activity, water-phase thickening ability, and emulsifying performance. The critical micelle concentration of PAADB was approximately 2500 mg/L, with a viscosity of 84.69 mPa·s at 50 °C. Additionally, interfacial tension experienced a notable decrease from 46.53 to 14.56 mN/m. At an optimal concentration of 4000 mg/L, PAADB reduced the viscosity of extra-heavy oil by over 92% across various temperatures and by more than 93% for different types of extra-heavy oil. PAADB demonstrated excellent emulsification ability and emulsion stability, effectively dispersing crude oil to create water-in-oil droplets measuring 35.33 μm in size. Meanwhile, molecular dynamics simulations further unveiled the viscosity reduction mechanism of PAADB. The hydrophilic groups within PAADB molecules are regularly distributed on the water interface, while the hydrophobic groups infiltrate the oil molecules to form a stable interfacial film. PAADB and asphaltene spontaneously form a sandwich structure, reducing intermolecular forces and disrupting the interlayer structure of asphaltene molecules. In general, this novel amphiphilic polymer demonstrates broad applicability and potential in extra-heavy oil recovery, providing valuable insights for the development of new heavy oil viscosity reducers (HOVRs).
危险品化学品经营许可证（带存储）