Yu Pengfei, Liu Xueqian, Lei Yun, Gao Yuming, Peng Haoping
Jiangsu Key Laboratory of Oil and Gas Storage & Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China.
ACS Omega. 2022 Mar 15;7(12):10687-10694. doi: 10.1021/acsomega.2c00400. eCollection 2022 Mar 29.
The restart process of waxy crude pipelines is an unsteady thermo-hydraulic coupling process, which mainly includes two modes of the constant flow and constant pressure in industry. However, some parameters involved in the restart process have obvious uncertainties, such as the operating parameters, physical parameters of crude oil, environmental parameters, and pipeline parameters, resulting in the traditional deterministic method that cannot scientifically describe the safety of the pipeline restart process. To do this, this study introduces the reliability-based limit state method and interference principle into the safety evaluation of waxy crude pipelines during the restart process. Considering the random fluctuation characteristics of the mentioned parameters, the restart physical process, the flow and heat transfer mathematical model, and the restart failure limit state function were established. On this basis, the failure probability during the restart process for one waxy crude pipeline under constant flow was determined. This research has realized the quantitative evaluation of restart safety of waxy crude pipelines.
含蜡原油管道再启动过程是一个非稳态热液耦合过程，在工业上主要包括定流量和定压力两种模式。然而，再启动过程中涉及的一些参数具有明显的不确定性，如运行参数、原油物理参数、环境参数和管道参数等，导致传统的确定性方法无法科学地描述管道再启动过程的安全性。为此，本研究将基于可靠性的极限状态方法和干涉原理引入含蜡原油管道再启动过程的安全评价中。考虑上述参数的随机波动特性，建立了再启动物理过程、流动与传热数学模型以及再启动失效极限状态函数。在此基础上，确定了某含蜡原油管道在定流量下再启动过程中的失效概率。本研究实现了含蜡原油管道再启动安全性的定量评价。
