全球能源和化工原料需求的持续增长引起了人们对重油资源开发的极大关注。重油提取的主要挑战在于降低原油粘度。碱-表面活性剂-聚合物(ASP)驱油技术已成为提高稠油采收率的有效方法。然而,化学试剂的色谱分离在重油提取中存在巨大障碍。为了应对这一挑战,我们采用了自由基聚合法,使用丙烯酰胺,2-丙烯酰胺基-2-甲基丙磺酸,丙烯酸月桂酯,和丙烯酸苄酯为原料。这种方法导致了称为PAALB的多功能两亲聚合物的合成,我们将其应用于重油的提取。使用红外光谱和核磁共振光谱等技术对PAALB的结构进行了细致的表征。为了评估PAALB在降低稠油粘度和提高采收率方面的有效性,我们进行了一系列测试,包括接触角测量,界面张力评估,自乳化实验,临界缔合浓度测试,和沙堆管驱油实验。研究结果表明,PAALB可以减少油水驱替,降低重油粘度,并提高注入地层时的扫量。5000mg/LPAALB的溶液将水滴在核心表面的接触角从106.55°降低到34.95°,将岩心表面从油湿转变为水湿,从而实现油水驱替。此外,10,000mg/LPAALB的溶液将油水界面张力降低至3.32×10-4mN/m,达到超低的界面张力水平,从而诱导地层内重油的自发乳化。在油水比为7:3的条件下,10,000mg/LPAALB的溶液可以通过玻璃瓶倒置法将重油的粘度从14,315mPa·s降低到201mPa·s,粘度降低率为98.60%。在沙堆管驱油实验中,在1.5PV的注入量下,与传统的水解聚丙烯酰胺(HPAM)聚合物相比,PAALB的回收率提高了25.63%。这项关于两亲性聚合物的研究得出的见解对于旨在提高稠油采收率的化学驱油策略的开发和优化具有重要的参考价值。
The continuous growth in global energy and chemical raw material demand has drawn significant attention to the development of heavy oil resources. A primary challenge in heavy oil extraction lies in reducing crude oil viscosity. Alkali-surfactant-polymer (ASP) flooding technology has emerged as an effective method for enhancing heavy oil recovery. However, the chromatographic separation of chemical agents presents a formidable obstacle in heavy oil extraction. To address this challenge, we utilized a free radical polymerization method, employing acrylamide, 2-acrylamido-2-methylpropane sulfonic acid, lauryl acrylate, and benzyl acrylate as raw materials. This approach led to the synthesis of a multifunctional amphiphilic polymer known as PAALB, which we applied to the extraction of heavy oil. The structure of PAALB was meticulously characterized using techniques such as infrared spectroscopy and Nuclear Magnetic Resonance Spectroscopy. To assess the effectiveness of PAALB in reducing heavy oil viscosity and enhancing oil recovery, we conducted a series of tests, including contact angle measurements, interfacial tension assessments, self-emulsification experiments, critical association concentration tests, and sand-packed tube flooding experiments. The research findings indicate that PAALB can reduce oil-water displacement, reduce heavy oil viscosity, and improve swept volume upon injection into the formation. A solution of 5000 mg/L PAALB reduced the contact angle of water droplets on the core surface from 106.55° to 34.95°, shifting the core surface from oil-wet to water-wet, thereby enabling oil-water displacement. Moreover, A solution of 10,000 mg/L PAALB reduced the oil-water interfacial tension to 3.32 × 10-4 mN/m, reaching an ultra-low interfacial tension level, thereby inducing spontaneous emulsification of heavy oil within the formation. Under the condition of an oil-water ratio of 7:3, a solution of 10,000 mg/L PAALB can reduce the viscosity of heavy oil from 14,315 mPa·s to 201 mPa·s via the glass bottle inversion method, with a viscosity reduction rate of 98.60%. In sand-packed tube flooding experiments, under the injection volume of 1.5 PV, PAALB increased the recovery rate by 25.63% compared to traditional hydrolyzed polyacrylamide (HPAM) polymer. The insights derived from this research on amphiphilic polymers hold significant reference value for the development and optimization of chemical flooding strategies aimed at enhancing heavy oil recovery.