含蜡原油结构的存在性研究

STUDY ON EXISTENCE OF STRUCTURE FOR WAXY CRUDE OIL

所谓含蜡原油结构是指一定条件下原油中蜡晶颗粒相互连接所形成的一种充满整个体系的网络。采用流变学测试及分析技术试验研究含蜡模拟油的特征温度、粘温特性、流变特性 ,采用偏光显微技术分析含蜡模拟油凝胶状态时的微观结构。试验结果表明 :含蜡原油在一定条件下明显存在结构 ,共形成与原油所含蜡分子的大小与数量、蜡晶颗粒的对称性及大小密切相关 ,含蜡原油结构的存在是其粘度异常和流动性丧失的主要根源。这为含蜡原油降凝降粘途径的进一步研究奠定了理论基础。

The structure of waxy crude oil means that in the oil paraffin crystalline particles interconnect and form a kind of network which filled with the whole crude system under certain condition. The characteristic temperature, viscosity?temperature properties and rheological properties of simulated waxy oil have been studied systematically by mean of rheological measuring and analytical techniques. The microstructure of the oil in gel state has been analyzed using micropoloariscopic technique. Results show that the structure exists obviously in the waxy oil under certain condition, and its formation is closely relevant to the size and content of paraffin molecules in the oil, the symmetry and size of the paraffin crystalline particles. The existence of structure in the waxy oil is the main causes of its viscosity abnormality and lose of mobility. It provides a theoretical foundation for further studying the ways for pour point depression and viscosity reduction of the waxy crude oil.