聚合物对两性聚丙烯酰胺在不同淹没系统中的乳液稳定性的作用

IF 3.7 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY ACS Omega Pub Date : 2024-10-27 DOI:10.1021/acsomega.4c0323610.1021/acsomega.4c03236
Jin Huang, Xinxin Xia, Huai Jiang, Yanjia Huo, Jinling Li, Wei Li, Xiaorong Ma, Feng Li and Cuiqin Li*, 
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引用次数: 0

摘要

具有高粘度和良好粘温特性的聚合物作为提高石油采收率的化学制剂备受关注。通过新的乳液稳定性模型和分子模拟,研究了聚合物对具有良好粘温特性的两性聚丙烯酰胺(TSPAM)在不同淹没体系中的乳化稳定性的作用。结果表明,与水解聚丙烯酰胺(HPAM)相比,TSPAM 表现出更优越的乳液稳定性。含有 TSPAM 的乳液的半衰期比含有 HPAM 的乳液长 1-7 分钟。分子模拟结果表明,HPAM 分子在油水界面以 "点吸附 "方式吸附,而 TSPAM 分子则以 "面吸附 "方式吸附,因此界面吸附效率更高,界面膜更稳定。与含有 HPAM 的聚合物淹没体系相比,含有 TSPAM 的聚合物淹没体系显示出更大的界面厚度(1.029 nm)和更高的乳化效率。在含有 TSPAM 的二元体系中,添加 Na2CO3 或表面活性剂可进一步提高乳液的稳定性。含有所有三种油置换剂的乳液稳定性最强,半衰期延长了 3.8-13.6 分钟。两性聚丙烯酰胺显著提高了乳液的稳定性。通过实验与分子模拟技术的结合,可以优化聚丙烯酰胺的分子结构,促进开发更高效的采油配方,用于提高石油采收率。
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Role of the Polymer in the Emulsion Stability of an Amphoteric Polyacrylamide in Different Flooding Systems

Polymers with high viscosity and good viscosity–temperature property have attracted attention as chemical agents for enhanced oil recovery. The role of polymers in the emulsifying stability of an amphoteric polyacrylamide (TSPAM) with good viscosity–temperature property in different flooding systems was investigated by means of a new emulsion stability model and molecular simulations. The results indicated that TSPAM exhibited superior emulsion stability compared to hydrolyzed polyacrylamide (HPAM). The half-life of emulsions containing TSPAM was 1–7 min longer than that of emulsions containing HPAM. The results of molecular simulation revealed that the HPAM molecules adsorbed at the oil–water interface in a “point adsorption” mode, whereas the TSPAM molecules adsorbed in a “surface adsorption” mode, resulting in higher interfacial adsorption efficiency and more stable interfacial film. The polymer flooding systems containing TSPAM showed a larger interfacial thickness of 1.029 nm and higher emulsification efficiency compared to the polymer flooding systems containing HPAM. The addition of Na2CO3 or surfactants further improved the stability of emulsions in the binary systems containing TSPAM. The stability of emulsions containing all three oil displacement agents was the strongest, with the half-life extended by 3.8–13.6 min. Amphoteric polyacrylamide significantly enhanced the stability of the emulsions. Through the integration of experimental and molecular simulation techniques, the molecular structure of polyacrylamide can be optimized, facilitating the development of more efficient oil recovery formulations for enhanced oil recovery applications.

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来源期刊
ACS Omega
ACS Omega Chemical Engineering-General Chemical Engineering
CiteScore
6.60
自引率
4.90%
发文量
3945
审稿时长
2.4 months
期刊介绍: ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.
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