Hydrate flow obstacles encountered during the exploitation of deep-water gas fields has received an increased attention. Based on the variations in the wellbore temperature of a deep-water gas well during the initial restarting period, and considering the interrelationship between the hydrate behavior and heat transfer, a prediction model for hydrate flow obstacle was established by comprehensively considering the hydrate formation, deposition, and decomposition. This model could be used to analyze the hydrate formation and decomposition regions dynamically and depict the evolution of the hydrate plug quantitatively during the restarting period. The computation results demonstrated that the wellbore temperature increased with the restarting time, which caused the hydrate formation region to decrease accordingly. During the initial restart under testing operations, hydrates always formed at low gas production rates in the tubing, which could plug the tubing after a certain restarting time. The risk of hydrate flow obstacle first increased and then decreased with an increase in the restarting production rate. During the initial restart under production operations, hydrates only formed at the initial restarting stage, which ranged from several minutes to more than 10 h. The hydrate flow obstacle risk first increased and then decreased with the restarting time, and no hydrate plugging occurred during the initial restarting period of the entire production process. Finally, the measures for preventing hydrate plugging during the initial restarting period were discussed. This work provides a valuable theoretical reference for preventing hydrate plugging during the initial restarting period of a deep-water gas well.

在开发深水气田过程中遇到的水合物流动障碍受到了越来越多的关注。基于深水气井初次重启期间井眼温度的变化，并考虑水合物行为与传热之间的相互关系，综合考虑水合物的形成，沉积过程，建立了水合物流动障碍的预测模型。和分解。该模型可用于动态分析水合物的形成和分解区域，并定量描述水合物在重新启动期间的演化。计算结果表明，井眼温度随重启时间的增加而升高，导致水合物形成区域相应减少。在测试操作中的初始重新启动期间，水合物始终以较低的气体生成速率在管道中形成，这可能在一定的重新启动时间后堵塞管道。水合物流动障碍的风险首先增加，然后随着重新生产速率的增加而降低。在生产操作下的初始重新启动期间，水合物仅在初始重新启动阶段形成，范围从几分钟到超过10小时不等。水合物流动障碍的风险随重新启动时间先增加然后降低，并且在整个生产过程的初始重新启动期间没有发生水合物堵塞。最后，讨论了在初始重新启动期间防止水合物堵塞的措施。