降凝剂,减阻剂在满输管道中的应用

在长输管道输送的原油中添加降凝剂并加热到一定温度，可以降低原油的凝点和粘度，从而改善原油的低温流变性。在管输原油中添加减阻剂，则可改变管中轴流的流态，减少沿程的摩损失，达到节能降耗的目的。添加降凝剂综合处理技术已成功地应用于低输量管道中，取得显著的效益。

Applying Depressant and Drag Reducer in Fully Loaded Pipeline.

While adding derpressant in the crude oil to be transported through pipeline and heating the oil up to a certain temperature can reduce oil's pour point and viscosity and thus improve its low temperature rheo-logical properties, adding drag reducer can moldify flow pattern, reduce friction loss and realize the purposes of energy saving and consumption reduction. The comprehensive treatment technology for depressant addition has been successfully applied in low flow pipelines, and considerable benefits have been achieved. However, application of depressant in fully-loaded pipeline came across several technical problems due to the big flow, high flow rate, small inter-station heat loss, station desigh of thermal load insufficient for secondary heat, treatment, as well as the pump station not having extra pressure. Field tests made in Qin -Jing Oil Pipeline show that applying depressant in fully loaded pipeline is quite promising, and that combination of depressant with drag reducer, which deteriorates low - temperature rheological properties, has a limited application future.