含蜡原油油水两相的降温胶凝特性

Characteristics of temperature dropping and gelatination of the waxy crude oil-water two-phase system

含蜡原油的胶凝特性决定了原油-水两相体系在温降过程中依然存在由溶胶体系向凝胶体系转变的行为过程,且对以集输生产为代表的原油储运工艺有着重要影响。通过描述含蜡原油油水两相降温胶凝特性的方法及原理,对非牛顿含蜡原油油水两相体系的胶凝特征温度及胶凝结构强度进行了流变测量,研究了含蜡原油不同水含量体系在不同温降过程中黏弹性参数的变化规律,实现了对含蜡原油油水两相胶凝特征参数的定量表征,构建了含蜡原油油水两相降温胶凝过程特性的普适性规律,解释了两相体系的降温速率及含水量对其胶凝行为的影响与作用机制,为含蜡原油油水两相节能输送工艺中流动保障技术的应用与优化提供了理论和实验依据。

Characteristics of gelatination of waxy crude oil determine the existence of transition from sol system to gel system during temperature dropping of the crude oil-water two-phase system. Such characteristics also present significant impacts to crude oil storage and transportation processes represented by gathering. In this paper, techniques and principles are developed for description of characteristics of temperature dropping and gelatination of the waxy crude oil-water twophase system, and rheological measurements are conducted for gelatination temperatures and structures of the non-Newton waxy crude oil-water two-phase system. Then, the changes in visco-elastic parameters of waxy crude oil with different water contents in different temperature dropping processes are identified to facilitate quantitative description of gelatination parameters of the waxy crude oil-water two-phase system. Additionally, universal characteristics of temperature dropping and gelatination processes of the waxy crude oil-water two-phase system are defined, and impacts and action mechanisms of temperature dropping rates and water contents of the system to gelatination are investigated. Relevant research results can provide reliable theoretic and experimental foundations for application and optimization techniques to maintain proper flow of waxy crude oil-water two-phase system with less energy consumption.