微观液滴分布对含蜡原油乳状液流变性的影响

doi:10.7623/syxb201304019

石油学报 ›› 2013, Vol. 34 ›› Issue (4): 765-774.DOI: 10.7623/syxb201304019

微观液滴分布对含蜡原油乳状液流变性的影响

黄启玉, 王蕾

中国石油大学城市油气输配技术北京市重点实验室北京 102249

收稿日期:2013-01-28 修回日期:2013-05-12 出版日期:2013-07-25 发布日期:2013-07-04
通讯作者: 黄启玉
作者简介:黄启玉,男,1969年9月生,1992年毕业于石油大学(华东)石油及天然气储运专业,2000年获石油大学(北京)油气储运专业博士学位,现为中国石油大学(北京)研究员、博士生导师,主要从事油气长距离管输工艺、原油流变性、原油蜡沉积等方面研究。Email:huang_qi_yu@sina.com
基金资助:
国家自然科学基金重点项目(No.51134006)资助。

Effect of droplet distribution on rheological properties of water-in-oil emulsion in waxy crude oils

HUANG Qiyu, WANG Lei

Beijing Key Laboratory of Urban Oil & Gas Distribution Technology, China University of Petroleum, Beijing 102249, China

Received:2013-01-28 Revised:2013-05-12 Online:2013-07-25 Published:2013-07-04

摘要/Abstract

摘要：

通过显微镜观察并拍摄原油乳状液的微观结构图像,研究了乳状液体系分散相液滴大小及分布规律,以及微观液滴分布对乳状液体系流变性的影响机理。W/O型原油乳状液中含水率增加,引起内相液滴个数增多,小液滴所占的比例减小,相对大的液滴所占的比例增大;搅拌转速的增大,使体系内相液滴个数增多,平均液滴直径减小。通过测试在固定搅拌条件下制备的不同含水率的3种含蜡原油乳状液在原油凝点附近温度屈服特性和触变性等流变特性,可以发现随含水率的增大,乳状液体系屈服应力增大、触变性增强,且含水率越高,变化的趋势越明显。通过测试不同搅拌转速下制备的含水率为30% 的原油乳状液在原油凝点附近温度的触变性,可以看出随搅拌转速的增大,体系经受同等剪切速率剪切时对应的剪切应力增大、触变性增强。进一步建立了屈服应力与测试温度、含水率之间的关系式,其平均相对误差为9.83%。

关键词: 含蜡原油, 乳状液, 液滴分布, 屈服应力, 触变性

Abstract:

In order to investigate droplet size and distribution of dispersed phase of waxy crude oil with water-in-oil emulsion, and influence mechanism of micro droplet distribution on rheological property of emulsion system, microstructure images of crude oil emulsion were observed and captured by microscope. It is observed that dispersed droplet number increases with the increase of water cut, and among the droplets quantitative proportion of small droplets decrease in comparison to the increase of relatively large droplets. With the increase of stirring speed during preparation, dispersed droplet number increases while the Sauter mean diameter of droplets is decreased. Three different waxy crude emulsions were prepared with different water cuts at a constant stirring speed, and the rheological properties of yield characteristics and thixotropy near the gel points were measured. With the increase of water cut, yield stress and thixotropy of water-in-oil crude emulsions were increased. And this trend will be enhanced by the increasing water cut. In addition, experimental results regarding the thixotropy near the gel point for 30% water cut emulsion samples prepared at different stirring speeds show that, with the increase in stirring speed, shear stress of water-in-oil crude emulsions was increased under equivalent shear rate, and so does the thixotropy. Finally, a relations correlated the yield stress with the measured temperature and water content was established and with an average relative error of 9.83%.

Key words: waxy crude oil, emulsion, droplet distribution, yield stress, thixotropy

中图分类号:

TE866

黄启玉, 王蕾. 微观液滴分布对含蜡原油乳状液流变性的影响[J]. 石油学报, 2013, 34(4): 765-774.

HUANG Qiyu, WANG Lei. Effect of droplet distribution on rheological properties of water-in-oil emulsion in waxy crude oils[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(4): 765-774.

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微观液滴分布对含蜡原油乳状液流变性的影响

Effect of droplet distribution on rheological properties of water-in-oil emulsion in waxy crude oils

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