As is well known, resin and asphaltene greatly increase the viscosity of the oil, which causes difficulty for heavy oil to flow and to be displaced. Therefore, reducing the viscosity of heavy oil effectively is the key to enhance oil recovery. A hyperbranched copolymer named as HVR grafted with hydrophilic surfactant monomers, was synthesized and evaluated in this paper as an alternative to reduce the offshore heavy oil viscosity. The synthesis method of HVR through free-radical copolymerizing using the third generation polyamidoamine dendrimer, acrylamide, acrylic acid and surfactant monomers in deionized water was detailed in this paper. Thereupon the characterization of HVR were described by Fourier transform infrared spectroscopy and ¹H nuclear magnetic resonance spectroscopy. The physical properties of HVR solution including apparent viscosity, oil viscosity reducing ability, interfacial tension were comprehensively studied. Otherwise the effect of HVR on sheet structure of asphaltene aggregate and asphaltene aggregation inhibition-dispersion activity were measured by X-ray diffraction and ultraviolet-visible spectrophotometer, respectively. The results indicate that apparent viscosities of HVR solution is relatively not high. For example, after shearing with a Waring blender at 3500 rpm for 20 s, the viscosity of 2500 ppm HVR solution is only 22.7 cP. However, the HVR solution has a relatively high viscosity remaining rate, which is approximately 58%. On the other hand, HVR solution has a good viscosity reducing ability on heavy oil. For the oil viscosities from 350 cP to 500 cP, the viscosity reduction rate of HVR at 2000 ppm is approximately 97% under the oil-water ratio of 3:7. In addition, the oil-water interfacial tension can be reduced by HVR solution at the concentration of 2500 ppm to 1.61 × 10^-2 mN·m^-1. Comparing the asphaltene aggregates after interacting with HPAM and HVR, it illustrates that the layer spacing, interchain distance and diameter of the aromatic sheets are lager if interacting with HVR; meanwhile height of the aromatic clusters and effective number of aromatic sheets are smaller due to the reaction with HVR. In addition, if compared with the asphaltene treated by HPAM, with the increase of HVR concentration, the absorbance of asphaltene in toluene treated by HVR solution decreased significantly. Overall, this new hyperbranched copolymer shows potential for applications in heavy oil viscosity reduction.

众所周知，树脂和沥青质极大地增加了油的粘度，这导致重油难以流动和置换。因此，有效降低重油粘度是提高采油率的关键。合成了一种名为HVR的超支化共聚物，接枝了亲水性表面活性剂单体，并在本文中进行了评估，以降低海上重油粘度。本文详细介绍了在去离子水中使用第三代聚酰胺型胺树枝状聚合物，丙烯酰胺，丙烯酸和表面活性剂单体通过自由基共聚合成HVR的方法。随后，通过傅立叶变换红外光谱和¹对HVR的表征进行了描述。H核磁共振波谱学。全面研究了HVR溶液的物理性能，包括表观粘度，油粘度降低能力，界面张力。否则用X射线衍射和紫外可见分光光度计分别测定了HVR对沥青质骨料片状结构和沥青质骨料的抑制分散活性的影响。结果表明，HVR溶液的表观粘度相对较高。例如，用Waring搅拌器在3500 rpm下剪切20 s后，2500 ppm HVR溶液的粘度仅为22.7 cP。但是，HVR溶液具有较高的粘度保留率，约为58％。另一方面，HVR溶液对重油具有良好的降粘能力。对于从350 cP到500 cP的油粘度，在3：7的油水比下，HVR在2000 ppm时的粘度降低率约为97％。此外，HVR溶液可以在2500 ppm的浓度下将油水界面张力降低至1.61×10^-2 mN·m ^-1。比较与HPAM和HVR相互作用后的沥青质骨料，表明与HVR相互作用时芳族片的层间距，链间距离和直径更大。同时，由于与HVR的反应，芳香簇的高度和芳香片的有效数量减少。另外，如果与HPAM处理的沥青质相比，随着HVR浓度的增加，HVR溶液处理的甲苯中沥青质的吸光度显着下降。总体而言，这种新的超支化共聚物显示出在降低重油粘度方面的应用潜力。