大庆原油的粘弹性实验研究  

An experimental study on viscoelasticity of Daqing crude oil

作　　者：侯磊[1] 张劲军[1] 

机构地区：[1]中国石油大学石油天然气工程学院,北京102249

出　　处：《石油学报》2005年第6期109-112,共4页Acta Petrolei Sinica

基　　金：教育部科学技术研究重点项目(No.104118)"含蜡原油流变性与蜡晶形态及结构关系的研究"部分成果

摘　　要：用RSH150控制应力流变仪对大庆原油进行了振荡剪切实验。结果表明,储能模量和耗能模量随测量温度的降低呈指数规律增加;存在使流变性恶化的“最差加热温度”;降温速率越高,测量温度下蜡晶结构强度和胶凝温度越低。在同样的剪切温度下,粘弹性参数和胶凝温度随粘性流动能量耗散增加而急剧降低直至达到稳定状态;在同样的粘性流动能量耗散下,剪切温度越接近测量温度,储能模量和耗能模量越低,胶凝温度越低;当剪切温度接近或超过反常点时,测量温度下的粘弹性参数基本不随剪切温度变化;原油结构在经历剪切后具有不可逆的恢复特性。The gelation extent and structure strength can be revealed by the viscoelastic parameters and gelation temperature measured by small amplitude oscillatory shear experiment. A series of oscillatory shear experiments were conducted to measure the viscoelastic parameters of Daqing crude oil with a stress-controlled rheometer RSH150. The results showed that the storage modulus and loss modulus increased in an exponential fashion as the test temperature was reduced. There existed a worst heating temperature for the theological behavior. The strength of waxy structure and gelation temperature decreased when increasing cooling rate. At the same shear temperature, the strength of waxy structure decreased rapidly and finally tended to a steady state as the energy dissipation of viscous flow increased. Under the same energy dissipation of viscous flow, when the shear temperature was close to the measuring temperature, the low storage modulus, loss modulus and gelation temperature would emerge. When the shear temperature was close to or higher than abnormal point, the viscoelastic parameters varied little with the shear temperature. The recovery of sheared waxy structure displayed an irreversible property.

关 键 词：含蜡原油 振荡剪切 粘弹性 胶凝温度 实验研究 

分 类 号：TE832.3[石油与天然气工程—油气储运工程]