Soleimani Hamid Mohammad, Sadeghi Mohammad Taghi
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, 16846-13114, Iran.
Sci Rep. 2025 Jan 19;15(1):2444. doi: 10.1038/s41598-025-86530-w.
The experimental analysis of nanoclay in enhanced oil recovery applications was rarely investigated. The main goal of this study is to analyze the flowing behavior of nanoclay as enhanced oil recovery fluid. After finding the most stable enhanced oil recovery fluid, the flow characteristic measurement was done. All of the experiments were performed in the ambient pressure and temperature where all of the core samples and thin sections are oil-wet in nature. Capabilities of nanoclay as an enhanced oil recovery fluid are determined in the static flow and flooding tests. The results of the Amott test (static) showed that the oil recovery from the core was 2.3 mL in the cetyl trimethyl ammonium bromide base fluid, 2.1 mL in the nano-fluid (nanoclay + cetyl trimethyl ammonium bromide), and 1.8 mL in the nanoclay. In the dynamic test, by examining the flooding test in the two modes of nano-fluid (approximately 3.5 h) and nanoclay (approximately 2.5 h) and recording the production curve over time, it was observed that the final production rate for the nano-fluid was approximately 79% and for the nanoclay, approximately 54.5% of the oil in-situ. Using nanoclay as an enhanced oil recovery fluid that is economical and environmentally friendly is the main finding of this study. Finally, it is founded that the optimum enhanced oil recovery fluid during the experiments is 0.5 wt% cetyl trimethyl ammonium bromide and 0.1 wt% nanoclay that is called nano-fluid.
关于纳米黏土在提高采收率应用方面的实验分析鲜有研究。本研究的主要目标是分析纳米黏土作为提高采收率流体时的流动行为。在找到最稳定的提高采收率流体后，进行了流动特性测量。所有实验均在环境压力和温度下进行，所有岩心样品和薄片在本质上均为油湿。纳米黏土作为提高采收率流体的性能在静态流动和驱替试验中得以确定。阿摩特试验（静态）结果表明，在十六烷基三甲基溴化铵基液中，岩心的采油量为2.3毫升；在纳米流体（纳米黏土 + 十六烷基三甲基溴化铵）中为2.1毫升；在纳米黏土中为1.8毫升。在动态试验中，通过考察纳米流体（约3.5小时）和纳米黏土（约2.5小时）两种模式下的驱替试验并记录随时间的产量曲线，观察到纳米流体的最终产率约为原地油量的79%，纳米黏土的约为54.5%。本研究的主要发现是使用纳米黏土作为一种经济且环保的提高采收率流体。最后，发现在实验过程中最佳的提高采收率流体是0.5重量%的十六烷基三甲基溴化铵和0.1重量%的纳米黏土，即所谓的纳米流体。
