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埋地输油管道在运行中不可避免地会遇到停输问题,油管内原油与土壤中的热力平衡状态被破坏,油温及土壤温度将重新分布。这直接影响管内原油温降情况,需研究这一非稳态热力过程。针对新疆塔中油田埋地输油管道,分析非穗态热力过程,建立了埋地管道传热计算模型。此数学模型与传统模型相比,充分考虑到大地本身恒温层对埋地输油管道传热的影响,把半无界域化为有界域,大大提高了计算结果的精确度。经过实测比较,该数学模型建立基本正确,符合实际工况,精确性较高,可直接应用于工程计算中。
Buried oil pipelines will inevitably encounter stoppage problems during operation. The thermal equilibrium between the crude oil and the soil in the oil pipe is destroyed, and the oil temperature and soil temperature will be redistributed. This has a direct impact on the temperature drop in the crude oil in the pipe. The unsteady heat process needs to be studied. Aiming at the buried oil pipeline in Tarzhong Oilfield in Xinjiang, the non-spike thermal process is analyzed, and the heat transfer calculation model of the buried pipeline is established. Compared with the traditional model, this mathematic model fully considers the influence of the constant temperature layer of the earth on the heat transfer in the buried oil pipeline and transforms the semi-unbounded domain into a bounded domain, which greatly improves the accuracy of the calculation result. After the measured comparison, the mathematical model to establish the basic correct, in line with the actual conditions, high accuracy, can be directly applied to engineering calculations.