降凝剂对胜利外输原油流变性的影响

研究了降凝剂对高蜡原油流变性的影响,主要探讨降凝剂的筛选、不加剂和加剂高蜡原油的全粘温曲线的测定、重复加热和高速剪切对降凝剂的改性效果。由实验得到主要结论:降凝剂使原油的凝点和反常点降低,原油的牛顿流体温度范围变宽,并使非牛顿流体温度下的粘度减小,但牛顿流体温度范围内的粘度基本没有变化;在重复加热的温度高于原油的反常点10 ℃左右时,重复加热对降凝剂的改性效果没有显著影响,但重复加热温度低于原油的反常点,重复加热显著恶化降凝剂的改性效果;在原油的反常点以上,高速剪切对降凝剂的改性效果无影响。在原油析蜡高峰区高速剪切,将大大恶化降凝剂的改性效果。在低于析蜡高峰区的温度高速剪切,会使降凝剂的改性效果的恶化程度有所减弱。

INFLUENCE OF POUR POINTDEPRESSANTS ON RHEOL2 OGY OF WAXY CRUDE OIL IN SHENGLI OIL FIELD

The effects of various factors on rheology and thermal characteristic of treated waxy crude have been investigated. The conclusions have been made as follows : pour point depressants can depress the pour point and abnormal point of crude oil ,broaden the temperature scope of Newtonian liquid of crude oil and lower greatly viscosity of nonONewtonian liquid crude oil.The influence of reheat and highOspeed shear on pour point depressants mainly depends on their temperature. When the temperature of reheat is more than crude’s abnormal point 10 ℃,reheat has little influence on the pour point depressants. However , when the temperature of reheat is lower than crude’s abnormal point , reheat has deteriorated the effect of pour point depressants. Above abnormal point , highOspeed shear has littleinfluence on the pour point depressants. When a great deal ofwaxy crystals has formed , highOspeed shear deteriorates the effect of the pour point depressants.