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大庆原油是典型的高凝、高粘、高含蜡原油,其低温流动性较差。为了改善含蜡原油的低温流动性,在大庆原油中添加复合纳米材料,通过XRD扫描实验和POM拍照,研究了复合纳米材料对含蜡原油中石蜡的结晶形态和析蜡点的影响。进行了大庆原油空白样和大庆原油分别添加50g/tEVA、100g/t复合纳米材料样品的动态降温XRD扫描对比实验,结果表明:复合纳米材料能够有效地改善大庆原油中石蜡的结晶形态(原油中60.01%的正构烷烃的结晶形态得到改善),使晶粒尺度变小,晶面间距离增大,并降低了大庆原油的析蜡点,从而明显改善了原油的低温流动性,提高了原油低温流动的时效稳定性;复合纳米材料对原油的降凝、降粘效果明显优于传统的EVA类化学降凝剂。
Daqing crude oil is a typical high-coagulation, high viscosity, high waxy crude oil, its low temperature fluidity is poor. In order to improve the low temperature fluidity of waxy crude oil, composite nanomaterials were added into Daqing crude oil. The effects of composite nanomaterials on the crystallization morphology and waxing point of paraffin wax in crude oil were studied by XRD scanning and POM photographing. The dynamic cooling XRD scan of 50g / tEVA and 100g / t composite nanomaterials in Daqing crude oil and Daqing crude oil was carried out respectively. The results show that the composite nanomaterials can effectively improve the crystalline morphology of paraffin in Daqing crude oil 60.01% of the normal paraffin crystalline morphology is improved), the grain size becomes smaller, the distance between the crystal plane increases, and reduces the waxing point of Daqing crude oil, thereby significantly improving the low temperature fluidity of crude oil and improve the crude oil Aging stability at low temperature; the effect of composite nanomaterials on pour point depressing and viscosity reduction of crude oil is obviously better than that of traditional EVA type chemical pour point depressant.