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热力开采稠油气驱阶段的埋地高温集油管道最大工作温度可达250℃,冬季平均敷设回填土温度为-10℃,温差高达250℃,温度应力可达655.2MPa,远远超过一般钢材材质的强度极限。这是油田生产的重要技术难题。辽河油田设计院结合稠油建设工程,对该课题进行了研究。引用埋地热管道的许用温度应力的概念,提出了热补偿的新方法。当温度升高时,埋地热管道的变形主要受四周土壤的制约,限制了埋地管道的伸长,使之承受温度压应力。对于250℃工作温度的管道,若埋地嵌
The maximum operating temperature of the buried high temperature oil gathering pipe in the heavy oil-gas flooding stage in thermal power exploitation can reach 250 ℃. The average backfill temperature in winter is -10 ℃, the temperature difference is up to 250 ℃, and the temperature stress can reach 655.2MPa, far exceeding that of the general steel material The strength limit. This is an important technical problem in oilfield production. Liaohe Oilfield Design Institute combined with heavy oil construction project, the subject has been studied. By introducing the concept of permissible temperature stress of buried hot ducts, a new method of thermal compensation is proposed. When the temperature rises, the deformation of the buried heat pipe is mainly controlled by the surrounding soil, which limits the elongation of the buried pipe and makes it withstand the temperature compressive stress. For 250 ℃ operating temperature of the pipeline, if buried inlay