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Research on Oil Displaced Effect of Multi‐Component Pore‐Throat Emulsion System
ChemistrySelect ( IF 2.1 ) Pub Date : 2018-12-07 , DOI: 10.1002/slct.201803013
Chengli Zhang 1 , Peng Wang 1 , Guoliang Song 2
Affiliation  

The core displacement experiment is designed to simulate the emulsification process of crude oil in reservoir, and a multi‐component pore‐throat emulsion system (0.8% hexadecane fluorinated betaine (CFN) + 0.4% sodium dodecylbenzenesulfonate (SDBS) + 1.2% monodisperse partially hydrophobic silanized SiO2 solution (particle diameter of 25 nm) + 0.9% sodium chloride (NaCl)), system 1, was developed. By comparing this system with the other emulsion systems, the stability and comprehensive performance of this system were evaluated. The results showed that the water evolution rate of emulsion system 1 was the smallest, 46.3%, which indicated that the stability of system 1 was the best, and the synergistic ability of emulsifiers CFN and SDBS was effective. After alkylation, nano‐sized SiO2 particles are turned into a special structure of hemispheric hydrophobic and hemispheric hydrophilic. They are closely adsorbed on oil‐water interface, which can inhibit the aggregation between emulsion drops and enhance the stability of emulsion. The micro particle size of emulsion was observed using inverted biological microscope, and it was found that the range of system 1 was the smallest. And microscopically or macroscopically, the properties such as the average diameter of the droplet, separation coefficient, effective share of the droplet, emulsion strength and stability comprehensive coefficient, were dominant. Therefore, the performance of system 1 was well. The displacement effect of emulsion flooding and change of fluid production in each layer under different permeability contrast were researched by three‐tube parallel core displacement experiment. It was found that oil displacement effect of system 1 was the best, the greater the coefficient of permeability variation, the greater decline of liquid production in the high permeability reservoir, and the greater increase of liquid production in the middle and low permeability reservoir. The new emulsion flooding system provides a new idea for the development of heterogeneous reservoirs.

中文翻译:

多组分孔喉乳液系统的驱油效果​​研究

岩心驱替实验旨在模拟储层中原油的乳化过程,以及多组分孔喉乳液系统(0.8%十六烷氟化甜菜碱(CFN)+ 0.4%十二烷基苯磺酸钠(SDBS)+ 1.2%单分散的部分疏水性开发了硅烷化的SiO 2溶液(粒径为25 nm)+ 0.9%氯化钠(NaCl)),系统1。通过将该系统与其他乳液系统进行比较,评估了该系统的稳定性和综合性能。结果表明,乳液体系1的出水率最小,为46.3%,表明体系1的稳定性最好,乳化剂CFN和SDBS的协同作用是有效的。烷基化后,纳米级SiO 2颗粒变成半球形疏水和半球形亲水的特殊结构。它们紧密吸附在油水界面上,可以抑制乳液滴之间的聚集并增强乳液的稳定性。使用倒置生物显微镜观察乳液的微粒径,发现系统1的范围最小。并且在微观上或宏观上,诸如液滴的平均直径,分离系数,液滴的有效份额,乳液强度和稳定性综合系数等特性是主要的。因此,系统1的性能良好。通过三管平行岩心驱替实验研究了不同渗透率对比下的驱油效果​​和各层产液量的变化。发现系统1的驱油效果​​最好,渗透率变化系数越大,高渗透率储层的产液量下降幅度越大,中低渗透率储层的产液量增加量越大。新的乳化驱系统为非均质油藏的开发提供了新思路。中低渗透储层的产液量增加较大。新的乳化驱系统为非均质油藏的开发提供了新思路。中低渗透储层的产液量增加较大。新的乳化驱系统为非均质油藏的开发提供了新思路。
更新日期:2018-12-07
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