胶凝含蜡原油的黏弹-触变特性  

Viscoelastic-thixotropic properties of gelled waxy crude oil

作　　者：国丽萍[1] 徐秋仿 刘扬[1] GUO Liping;XU Qiufang;LIU Yang(School of Petroleum Engineering,Northeast Petroleum University)

机构地区：[1]东北石油大学石油工程学院,黑龙江省大庆市163318

出　　处：《油气储运》2020年第6期645-649,共5页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金重点项目“W/O型含蜡原油乳状液触变特性及其微观机理研究”,51404072;国家自然科学基金重点项目“含蜡原油管道安全经济输送的基础问题研究”,51534004;黑龙江省博士后博士基金“基于多种加载模式的W/O型含蜡原油乳状液胶凝流变特性研究”,LBH~Z16036。

摘　　要：早期含蜡原油的触变性模型均为黏塑性模型,未考虑黏弹性的贡献,管道停输再启动的数值模拟也未考虑黏弹性的影响。为此,利用机械比拟原理,依据含蜡原油的"黏弹-屈服-触变"特点,建立了包含9个未知参数的黏弹-触变模型。利用两种物性不同的含蜡原油在凝点附近的剪切速率阶跃、剪切速率滞回环、恒剪切速率3种典型加载模式下的实验数据对模型进行验证。结果表明:3种测试的模型拟合值与实测值的平均相对偏差分别为4.6%、6.6%、4.2%,实现了用一个模型完整、准确地描述含蜡原油加载全过程的流变响应,为输油管道停输再启动过程的水力特性及管道安全运行提供了重要的基础资料。(图4,表2,参16)The earlier thixotropic model of waxy crude oil was basically a viscoplastic model,in which the contribution of viscoelasticity was not considered,and the influence of viscoelasticity was not taken into account in the numerical simulation of pipeline shutdown and restart accordingly.Therefore,the viscoelastic-thixotropic model with 9 unknown parameters was established based on the principle of mechanical analogy and the characteristics of"viscoelasticity-yieldthixotropy"of waxy crude oil.The model was verified by experimental data of two waxy crude oils with different physical properties under three typical loading modes of shear rate step,shear rate hysteresis loop and constant shear rate near the solidification point.The results show that the average relative deviations between the fitting values of the three testing models and the measured values are 4.6%,6.6%and 4.2%,respectively,which realizes a complete and accurate description of the rheological response of waxy crude oil during the full loading process with one model,and provides important basic data for the hydraulic characteristics of the oil pipeline during the shutdown and restart process and the safe operation of the pipeline.(4 Figures,2 Tables,16 References)

关 键 词：含蜡原油 黏弹性 触变性 黏弹-触变模型 

分 类 号：TE863[石油与天然气工程—油气储运工程]