中文摘要：

为准确把握埋地含蜡原油管道停输过程中管内原油温度场的分布和温降规律,建立了合理的管道-土壤-大气环境耦合的物理模型.综合考虑管内原油在停输过程中物理性质随温度的变化,以及析蜡过程中释放的析蜡潜热的影响,数值模拟埋地含蜡原油管道停输后管内原油温度场的分布以及温度变化过程,分析影响原油温降和温度场分布的因素.结果表明,管内原油初始油温越高,到达凝点时间越长,允许停输时间就越长;外界空气环境温度越高,管内原油与其温度差越小,管道散失的热量就越少,温降越缓慢;土壤的导热系数越大,热量在土壤中的传递速度越快,温降越快,保温效果越差.

英文摘要：

In order to accurately grasp the distribution and temperature drop law of the crude oil tem-perature field in the pipeline during the shutdown process of the buried wax-bearing crude oil pipe-line, a reasonable coupling physical model of the pipeline, soil and atmosphere environment is estab-lished. The variation of physical properties of the crude oil in pipeline with temperature in the shut-down process and the influence of latent heat of wax precipitation during the precipitation process are comprehensively considered.The distributions of temperature field and change law of temperature dur-ing the shutdown process are numerical simulated, and the factors affecting the temperature drop and temperature distribution of crude oil are analyzed.The results show that the higher the initial tempera-ture of the crude oil in pipeline is,the longer the time to reach the condensation point is,and the lon-ger the time that allows to shutdown is; the higher the outside air environment temperature is, the less the difference of crude oil temperatures and the outside temperature, the less the pipeline heat loss is, and the slower the temperature drop is; the bigger the soil heat conductivity is, the faster the transmis-sion speed of heat in the soil is,the faster the temperature drop is,and the poorer the heat preservation effect is.