微观蜡晶特征在流变曲线上的宏观体现  

Macroscopic manifestation of microscopic wax crystal characteristics on rheological curve

作　　者：聂向荣[1] 杨胜来[1] 丁景辰[1] 胡伟[1] 周锋[1] 王智林[1] 黄伟[1] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《油气储运》2014年第3期255-258,共4页Oil & Gas Storage and Transportation

基　　金：国家科技重大专项"大型油气田及煤层气开发"资助课题"苏丹3/7区高凝油油藏高效开发技术";2011ZX05032-002

摘　　要：为了研究证明含蜡原油流变曲线和微观蜡晶两者之间存在一定的关联,测试了广范围剪切速率下的含蜡原油流变曲线,确立了微观蜡晶和流变曲线之间的定性关系,并且取得以下认识:广范围剪切速率下的含蜡原油流变曲线能够一定程度地体现微观蜡晶特征,其中低剪切速率下的流变曲线能够体现蜡晶形态,高剪切速率下的流变曲线能够体现蜡晶结构;并非温度越低,剪切速率对粘度的影响程度越大,在高剪切速率下,有可能存在相反的情况;在低温条件下,剪切速率存在一个临界值,只有当剪切速率大于该值时,粘度才会出现较为明显的下降;温度越低,形成的蜡晶网格结构越稳定,需要较大的剪切应力,蜡晶网格结构才能破坏。该研究成果深化了对含蜡原油流变性的认识,具有一定的理论意义。In order to research to prove that there is a correlation between the rheological curve of waxy crude and the microscopic wax crystal, the theological curve of waxy crude under wide range of shear rate is tested to build the qualitative relationship between microscopic wax crystal and rheological curve. The result shows that the rheological curve of waxy crude under wide range of shear rate can reflect the microscopic wax crystal characteristics to some degree and the rheological curve under low shear rate can reflect the form of wax crystal, while the rheological curve under high shear rate can reflect the wax crystal structure. Besides, it is not always the case that the lower the temperature is, the bigger the influence of shear rate on viscosity is. Under high shear rate, the situation could be the opposite. At low temperatures, shear rate has a critical value and only when the shear rate is higher than the critical value can there be a relatively obvious fall in viscosity. The lower the temperature is, the more stable the formed wax crystal grid structure is, which requires high enough shear stress to break down. This research result deepens the understanding of rheological property of waxy crude and is of some theoretical significance. （6 Figures, 1 Table, 15 References）

关 键 词：含蜡原油 蜡晶形态 蜡晶结构 流变曲线 剪切速率 

分 类 号：TE832[石油与天然气工程—油气储运工程]