热历史对乍得原油析蜡特性及黏温性质的影响  

Effect of Thermal History on Wax Precipitation Characteristics and Viscosity-Tempera⁃ture Properties of Chad Crude Oil

作　　者：李鑫源 姬鹏举 王翊婷 LI Xinyuan;JI Pengju;WANG Yiting(Sino Oil King Shine Chemical Co.,Ltd.)

机构地区：[1]廊坊开发区中油科新化工有限责任公司

出　　处：《油气田地面工程》2024年第4期27-32,共6页Oil-Gas Field Surface Engineering

摘　　要：在测试乍得原油物性的基础上,深入研究热处理温度和降温速率对析蜡特性及黏温性质影响。以乍得A、C两种原油为研究对象,测试了其蜡含量、倾点、族组分和正构烷烃碳数分布,发现乍得原油属于高含蜡原油;采用差示扫描量热法(DSC)考察了其析蜡特性,结果表明:较高的处理温度、较大的降温速率会导致析蜡点后移,更高的处理温度能够在一定程度上降低原油在降温过程中的累积析蜡量;通过测定两种原油在不同温度热处理以及不同降温速率条件下的黏度—温度关系发现,较高的处理温度、较大的降温速率能够使原油黏温特性改善;使用偏光显微镜观察发现,在降温过程中蜡晶结构逐渐致密。热历史对原油的影响为乍得原油加热输送及降凝改性输送提供了理论基础。On the basis of testing the physical properties of Chad crude oil,an in-depth study of the effects of heat treatment temperature and cooling rate on wax precipitation characteristics and viscositytemperature properties is conducted.Taking two crude oils from Chad A and C as the research objects,the wax content,pour point,SARA and n-alkane carbon number distribution are tested,and it is found that Chad crude oil is a high wax content crude oil.Differential Scanning Calorimetry(DSC)is used to investigate its wax precipitation characteristics.The result shows that higher treatment temperature and larger cooling rate can affect the backward shift of the wax precipitation point,and higher treatment temperature can reduce the accumulated wax precipitation of crude oil during the cooling process.By measuring the viscosity-temperature relationship of two types of crude oil under different heat treatment temperatures and different cooling rates,it is found that higher treatment temperatures and larger cooling rates can make the crude oil have better viscosity-temperature characteristics.Observing under a polarizing microscope,it is found that the wax crystal structure gradually becomes denser during the cooling process.The impact of thermal history on crude oil provides a theoretical foundation for the heating transportation and the pour point reduction modification transportation of the Chad crude oil.

关 键 词：原油 析蜡点 黏温曲线 碳数分布 

分 类 号：TE622.9[石油与天然气工程—油气加工工程]