石英砂对稠油乳状液的破乳作用机理
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1.中国海洋石油集团有限公司海洋石油工程股份有限公司;2.油气藏地质及开发工程国家重点实验室

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国家自然科学(51779212,U19B2012,51911530129);四川省科技计划项目资助(2019YJ0350)。第一作者:张佃臣(1985-),男,硕士,高级工程师,主要从事含砂稠油流动与分离、海洋平台总体规划布局等方面的研究。Email:375061603@qq.com。 ,张世坚2,胡晓明1,唐敏1,邱波1,单雨婷2,敬加强2


Demulsification Mechanism of quartz sand on heavy oil emulsion
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State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Sichuan Chengdu

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    摘要:

    由于稠油乳状液不透明,无法直观认识砂粒对稠油乳状液稳定性的影响过程,一些学者通过傅里叶红外光谱检测到矿物颗粒表面吸附的沥青质,推测这些颗粒因吸附油水界面膜上的沥青质破坏了油水界面膜强度,促进了水滴聚团沉降,从而实现稠油乳状液破乳分层。但这种认识无法解释笔者实验中的一些现象,本文进行了杯式分水、流变性测试和润湿性测试等实验,得到了石英砂对稠油乳状液稳定性影响机制:砂粒粒径较小,水滴粒径较大时,即会发生水珠完全浸湿包裹砂粒的现象,包裹砂粒的水珠比重增加,沉降速度加快,这是砂实现稠油乳状液破乳分层的主要原因,而这一认识也通过砂在白油中的沉降实验得到了验证。

    Abstract:

    Because the heavy oil emulsion is opaque and it is impossible to intuitively understand the influence of sand particles on the stability of heavy oil emulsions, some scholars have detected the asphaltenes adsorbed on the surface of mineral particles by Fourier transform infrared spectroscopy. It is speculated that these particles destroy the strength of oil/water interfacial film due to the adsorption of asphaltenes on the oil/water interfacial film and promote the aggregation of water droplets,Sso as to realize demulsification and stratification of heavy oil emulsion.SHowever, this understanding cannot explain some phenomena in our experiment. In this paper, experiments such as bottle experiment, rheology test and wettability test are carried out, and the influence mechanism of quartz sand on the stability of heavy oil emulsion is obtained: when the sand particle size is small and the water droplet particle size is large, the phenomenon of water droplets completely wetting and wrapping the sand particles will occur, the proportion of water droplets wrapping the sand particles will increase, and the settlement speed will accelerate,SThis is the main reason for the demulsification and stratification of heavy oil emulsion by sand, and this understanding is also verified by the sedimentation experiment of sand in white oil.

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  • 收稿日期: 2021-08-18
  • 最后修改日期: 2021-10-09
  • 录用日期: 2021-10-18
  • 在线发布日期: 2021-11-04
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