Restart of gelled waxy crude oil pipeline is one of the major flow assurance concern in petroleum production. Reliable representation of rheological behavior of gelled waxy crude oil serves as the basis for pipeline restart analysis and modeling. In this work, the Dullaert-Mewis elasto-viscoplastic thixotropic model was modified and applied to improve the representation of the rheology of gelled waxy. Numerical analyses were conducted to evaluate the effects of compressibility, Reynolds number, yield stress number and structural breakdown rate of gelled waxy crude oil on pipeline restart. Combined with rheological experiment data, the effect of viscoelasticity of gelled waxy crude oil on pipeline restart was analyzed. The results suggest that with increasing compressibility of gelled waxy crude oil, the speed of propagation of yield front during restart decreases, the total restart time and steady-state velocity increase and the minimum required pressure difference for successful restart decreases. Low Reynolds number, high yield stress number and low structural breakdown rate lead to high minimum required pressure difference for successful restart and prolonged total restart time. It was also observed that the modified Dullaert-Mewis elasto-viscoplastic thixotropic model provides more optimistic restart assessments, characterized by lower minimum required pressure difference, higher steady-state velocity and shorter total restart time, compared with assessments with a viscoplastic thixotropic model.

胶凝蜡质原油管道的重启是石油生产中主要的流量保证问题之一。凝胶状蜡质原油流变行为的可靠表示是管道重启分析和建模的基础。在这项工作中，对Dullaert-Mewis弹黏粘塑性触变模型进行了修改并应用于改善胶状蜡质流变学的表示。进行了数值分析，以评估胶凝蜡质原油的可压缩性，雷诺数，屈服应力数和结构分解速率对管道重启的影响。结合流变实验数据，分析了凝胶状蜡质原油的粘弹性对管道重启的影响。结果表明，随着胶凝蜡状原油压缩性的提高，重新启动时屈服前沿的传播速度降低，总重新启动时间和稳态速度增加，成功重新启动所需的最小压力差减小。低雷诺数，高屈服应力数和低结构破坏率会导致成功重启和延长总重启时间所需的最小最小压差较高。还观察到，与粘塑性触变模型相比，改进的Dullaert-Mewis弹粘塑性触变模型提供了更乐观的重启评估，其特征在于更低的最小所需压差，更高的稳态速度和更短的总重启时间。总重启时间和稳态速度增加，成功重启所需的最小压力差减小。低雷诺数，高屈服应力数和低结构破坏率会导致成功重启和延长总重启时间所需的最小最小压差较高。还观察到，与粘塑性触变模型相比，改进的Dullaert-Mewis弹粘塑性触变模型提供了更乐观的重启评估，其特征在于更低的最小所需压差，更高的稳态速度和更短的总重启时间。总重启时间和稳态速度增加，成功重启所需的最小压力差减小。低雷诺数，高屈服应力数和低结构破坏率会导致成功重启和延长总重启时间所需的最小最小压差较高。还观察到，与粘塑性触变模型相比，改进的Dullaert-Mewis弹粘塑性触变模型提供了更乐观的重启评估，其特征在于更低的最小所需压差，更高的稳态速度和更短的总重启时间。