| 终冷温度对加剂改性大庆原油蜡沉积的影响 |
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| 引用本文： | 张栋,姚渭,刁宇,苗青,刘朝阳,闫锋,符雄,聂超飞.终冷温度对加剂改性大庆原油蜡沉积的影响[J].油气储运,2020(1):60-66. |
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| 作者姓名： | 张栋 姚渭 刁宇 苗青 刘朝阳 闫锋 符雄 聂超飞 |
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| 作者单位： | 中国石油管道科技研究中心?油气管道输送安全国家工程实验室;中国石油天然气管道工程有限公司国际项目中心;中国石油天然气股份有限公司长沙输油气分公司 |
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| 基金项目： | 中国石油天然气股份有限公司科学研究与技术开发项目“油气管道输送实(试)验新方法和新技术开发”，2015D-5008-39(GF) |
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| 摘 要： | 为了分析终冷温度对加剂改性原油蜡沉积规律的影响,保持油壁温差相同,控制不同的终冷温度,采用搅拌槽蜡沉积装置、流变仪、差热扫描量热仪等试验仪器,对添加纳米降凝剂的大庆油、添加EVA降凝剂的大庆油以及大庆空白油进行静态蜡沉积对比试验与动态剪切对比试验。同时,结合分子扩散、胶凝等机理,分析不同试验条件下加剂改性大庆油的结蜡规律。结果表明:当终冷温度较低时,加剂油结蜡总量明显高于空白油,但结蜡总量中含凝油多、蜡晶结构较弱;空白油结蜡总量低,但蜡晶结构较强;随着终冷温度升高,加剂油与空白油的结蜡量逐渐降低并趋于一致。终冷温度较低且剪切剥离强度较弱时,添加降凝剂会增加管输蜡沉积量;一旦经过高剪切或提高终冷温度,加剂油的结蜡量将明显降低,管输安全性提高。
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| 关 键 词： | 蜡沉积 终冷温度 分子扩散 胶凝现象 加剂 |
The effect of final cooling temperature on the wax deposition of Daqing oil modified with additives |
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| ZHANG Dong,YAO Wei,DIAO Yu,MIAO Qing,LIU Zhaoyang,YAN Feng,FU Xiong,NIE Chaofei.The effect of final cooling temperature on the wax deposition of Daqing oil modified with additives[J].Oil & Gas Storage and Transportation,2020(1):60-66. |
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| Authors: | ZHANG Dong YAO Wei DIAO Yu MIAO Qing LIU Zhaoyang YAN Feng FU Xiong NIE Chaofei |
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| Institution: | (PetroChina Pipeline R&D Center//National Engineering Laboratory for Pipeline Safety;International Project Center,China Petroleum Pipeline Engineering Corporation;PetroChina Changsha Oil&Gas Transportation Sub-Company) |
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| Abstract: | In order to analyze the effect of final cooling temperature on the wax deposition laws of the crude oil modified with additives,keep the same temperature difference of oil wall and control different final cooling temperatures,static wax deposition contrast test and dynamic shear contrast test were carried out on Daqing oil with nano pour point depressant,Daqing oil with EVA pour point depressant and Daqing blank oil using the wax deposition device of agitation tank,rheometer,differential scanning calorimeter and other test instruments.Then,based on the mechanisms of molecular diffusion and gelling,the wax deposition laws of Daqing oil modified with additives under different experimental conditions were investigated.It is shown that when the final cooling temperature is lower,the blank oil is low in the total wax deposition but its wax crystal structure is stronger;while the oil with additives is significantly higher than the blank oil in the total wax deposition,but there is more condensate in the total amount of wax deposition and the wax crystal structure is weaker.With the increase of the final cooling temperature,the wax deposition in the oil with additives and that in the blank oil decrease gradually and tend to be consistent.When the final cooling temperature is lower and the shear peel strength is weaker,the addition of pour point depressant can increase the wax deposition of pipeline transportation.And once the shear is high or the final cooling temperature is increased,the wax deposition of the oil with additives will be reduced significantly and the safety of pipeline transportation will be improved. |
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| Keywords: | wax deposition final cooling temperature molecular diffusion gelling phenomenon additive |
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