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Study on the thixotropy and structural recovery characteristics of waxy crude oil emulsion

Petroleum Science 2021年第4期18卷 1195-1202页

作者： Li-Ping Guo Xue Han Yun Lei Lei Wang Peng-Fei Yu Shuang Shia Key Laboratory of Enhanced Oil Recovery Ministry of EducationNortheast Petroleum UniversityHeilongjiang163000China Jiangsu Key Laboratory of Oil and Gas Storage&Transportation Technology Changzhou UniversityJiangsu213164China Exploration and Development Research Institute Daqing Oil Field Company LtdDaqingHeilongjiang163712China

Waxy crude oil emulsion has Thixotropic properties at the temperature near gel point,which is a macromechanical characterization of the structure failure and recovery of waxy crude oil emulsion.In this paper,the thixotropic behaviors of waxy crude oil emulsion near gel point were studied using hysteresis loop formed by stress linear increase and decrease,as well as the structural recovery characteristics.The influence of the loading conditions and water content on the thixotropy of waxy crude oil emulsion were analyzed with hysteresis loop area.The concept of"structural recovery"was introduced to study the degree of structural recovery after different stewing,and influencing factors were taken into account.Results have shown that for waxy crude oil emulsion,the failure to fully restore of the structure after lysis is the cause of the formation of hysteresis loop,and the loading conditions will not affect the strength of thixotropy and the degree of structural recovery.Additionally,the dispersed phase droplets weaken the thixotropy and structure recovery characteristics of waxy crude oil emulsion,and the greater the water content,the weaker the thixotropy.The findings can help to better understand the safe and economic operation of waxy crude oil-water pipeline transportation.

关键词： Waxy crude oil Emulsion Thixotropic properties Structural recovery Hysteresis loop

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