复合阴离子-非离子表面活性剂体系，具有优异的耐温耐盐性能，可提高采收率,Energy & Fuels

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复合阴离子-非离子表面活性剂体系，具有优异的耐温耐盐性能，可提高采收率
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-12-27 , DOI: 10.1021/acs.energyfuels.3c04523
Lin Li _{1,

2} , Yuxuan Liu _{1,

2} , Xiao Jin _{1,

2,

3} , Yunbo Dong _{1,

2} , Caili Dai _{1,

2}

Affiliation

开发耐温、耐盐表面活性剂体系对于提高石油采收率具有重要意义。本研究采用烷基酚聚氧乙烯醚羧酸钠10Na（APEC-10Na）和脂肪醇聚氧乙烯醚羧酸钠9Na（AEC-9Na）两种阴离子-非离子表面活性剂构建复合表面活性剂体系。当总浓度为0.3%、APEC-10Na与AEC-9Na质量比为7:3时,该复合体系可将油水界面张力降低至8.1×10 –2 ^mN ·m ^–1 ,归因于表面活性剂分子在界面上的密集排列。^{该系统可耐受高达 110 °C 的温度，并可耐受 18 × 10 4} mg L ^–1的一价盐浓度和 8 × 10 ³ mg L ^–1的二价盐浓度。复合表面活性剂体系可以将岩石表面润湿性从强疏水性改变为强亲水性，处理后的岩石表面水下-油接触角达到132.4°。复合体系油膜剥离率为73.4%，比商业体系高29.2%，比地层水高41%。复合体系岩心驱替实验采油率为61.7%，比商业体系提高4.8%，比地层水提高14%。该工作提出的复合表面活性剂体系不仅在高温高盐条件下实现了低界面张力，而且实现了有效的界面润湿性调节、充分剥离粘附油膜、促进油滴运移，为复合表面活性剂的设计提供了指导。用于高温高盐油藏高效开发的表面活性剂体系。

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Compound Anionic–Nonionic Surfactant System with Excellent Temperature and Salt Resistance for Enhanced Oil Recovery

The development of a temperature- and salt-resistant surfactant system is of great significance in enhanced oil recovery. In this study, two anionic–nonionic surfactants, alkylphenol polyoxyethylene ether carboxylate sodium-10Na (APEC-10Na) and fatty alcohol polyoxyethylene ether carboxylate sodium-9Na (AEC-9Na), were applied to construct a compound surfactant system. When the total concentration was 0.3% and the mass ratio of APEC-10Na to AEC-9Na was 7:3, the compound system could reduce the interfacial tension between oil and water to 8.1 × 10^–2 mN·m^–1, which could be attributed to the dense arrangement of the surfactant molecules in the interface. The system can resist temperatures up to 110 °C and tolerate a monovalent salt concentration of 18 × 10⁴ mg L^–1 and a divalent salt concentration of 8 × 10³ mg L^–1. The compound surfactant system can modify the rock surface wettability from strong hydrophobicity to strong hydrophilicity, with an underwater–oil contact angle reaching 132.4° for the treated rock surface. The oil film peeling rate of the compound system is 73.4%, which is 29.2% higher than that of the commercial system and 41% higher than that of the formation water. The oil recovery rate of the compound system in core displacement experiments is 61.7%, which is 4.8% higher than that of the commercial system and 14% higher than that of the formation water. The compound surfactant system proposed in this work not only achieved low interfacial tension under high-temperature and high-salinity conditions but also realized effective interface wettability regulation, sufficient stripping of adhered oil films, and promotion of oil droplet migration, providing guidance in designing compound surfactant system for the efficient development of high-temperature and high-salinity reservoirs.

更新日期：2023-12-27

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