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Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM
Langmuir ( IF 3.7 ) Pub Date : 2024-02-01 , DOI: 10.1021/acs.langmuir.3c03620
Mingwei Zhao 1, 2 , Ying Li 1, 2 , Caili Dai 1, 2 , Yingpeng Chen 1, 2 , Ziteng Yang 1, 2 , Kaiwen Liu 1, 2 , Zhenfeng Ma 1, 2
Langmuir ( IF 3.7 ) Pub Date : 2024-02-01 , DOI: 10.1021/acs.langmuir.3c03620
Mingwei Zhao 1, 2 , Ying Li 1, 2 , Caili Dai 1, 2 , Yingpeng Chen 1, 2 , Ziteng Yang 1, 2 , Kaiwen Liu 1, 2 , Zhenfeng Ma 1, 2
Affiliation
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Hydrolyzed polyacrylamide (HPAM) is commonly used in polymer flooding, however, it is prone to viscosity reduction at high temperatures and high salinities, weakening its ability to improve oil recovery. In this work, sulfonated modified silicon quantum dots (S-SiQDs) were synthesized and then added to HPAM to study the improvement of rheological properties and enhanced oil recovery performance of HPAM at high temperatures and salinities. It is found that the S-SiQDs with a concentration of only 0.1 wt % can significantly increase the viscosity of HPAM from 28.5 to 39.6 mPa·s at 60 °C and 10,000 mg/L NaCl. Meanwhile, the HPAM/S-SiQDs hybrid solution always possessed higher viscosity and viscoelastic moduli than HPAM, attributed to the hydrogen bonding between HPAM and S-SiQDs. Notably, HPAM/S-SiQDs still maintained elastic behavior at harsh conditions, indicating that they formed a strong network structure. Through oil displacement experiments, it was found that the oil recovery of HPAM/S-SiQDs was higher (28.3%), while that of HPAM was only 17.2%. Thereafter, the utilization sequence of oil during the displacement process was studied with nuclear magnetic resonance experiments. Ultimately, the oil displacement mechanism of HPAM/S-SiQDs was deeply analyzed, including viscosity thickening and wetting reversal.
中文翻译：
新型硅量子点的开发及其提高 HPAM 采收率的潜力
水解聚丙烯酰胺（HPAM）常用于聚合物驱，但在高温和高盐度下容易出现粘度下降，削弱了其提高采收率的能力。本工作合成了磺化改性硅量子点（S-SiQD），并将其添加到 HPAM 中，研究 HPAM 在高温和高盐度下流变性能的改善和提高采收率的效果。结果发现，浓度仅为0.1 wt%的S-SiQDs在60℃和10,000 mg/L NaCl下可以将HPAM的粘度从28.5 mPa·s显着提高到39.6 mPa·s。同时，由于HPAM和S-SiQDs之间的氢键作用，HPAM/S-SiQDs混合溶液始终具有比HPAM更高的粘度和粘弹性模量。值得注意的是，HPAM/S-SiQD 在恶劣条件下仍然保持弹性行为，表明它们形成了强大的网络结构。通过驱油实验发现，HPAM/S-SiQDs的采收率较高（28.3%），而HPAM的采收率仅为17.2%。此后，通过核磁共振实验研究了驱油过程中石油的利用顺序。最后，深入分析了HPAM/S-SiQDs的驱油机理，包括粘度增稠和润湿反转。
更新日期：2024-02-01
中文翻译：
新型硅量子点的开发及其提高 HPAM 采收率的潜力
水解聚丙烯酰胺（HPAM）常用于聚合物驱，但在高温和高盐度下容易出现粘度下降，削弱了其提高采收率的能力。本工作合成了磺化改性硅量子点（S-SiQD），并将其添加到 HPAM 中，研究 HPAM 在高温和高盐度下流变性能的改善和提高采收率的效果。结果发现，浓度仅为0.1 wt%的S-SiQDs在60℃和10,000 mg/L NaCl下可以将HPAM的粘度从28.5 mPa·s显着提高到39.6 mPa·s。同时，由于HPAM和S-SiQDs之间的氢键作用，HPAM/S-SiQDs混合溶液始终具有比HPAM更高的粘度和粘弹性模量。值得注意的是，HPAM/S-SiQD 在恶劣条件下仍然保持弹性行为，表明它们形成了强大的网络结构。通过驱油实验发现，HPAM/S-SiQDs的采收率较高（28.3%），而HPAM的采收率仅为17.2%。此后，通过核磁共振实验研究了驱油过程中石油的利用顺序。最后，深入分析了HPAM/S-SiQDs的驱油机理，包括粘度增稠和润湿反转。
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