PDF(Pubmed)
Abstract：
In the enhanced oil recovery (EOR) process, interfacial tension (IFT) has become a crucial factor because of its impact on the recovery of residual oil. The use of surfactants and biosurfactants can reduce IFT and enhance oil recovery by decreasing it. Asphaltene in crude oil has the structural ability to act as a surface-active material. In microbial-enhanced oil recovery (MEOR), biosurfactant production, even in small amounts, is a significant mechanism that reduces IFT. This study aimed to investigate fluid/fluid interaction by combining low biosurfactant values and low-salinity water using NaCl, MgCl2, and CaCl2 salts at concentrations of 0, 1000, and 5000 ppm, along with Geobacillus stearothermophilus. By evaluating the IFT, this study investigated different percentages of 0, 1, and 5 wt.% of varying asphaltene with aqueous bulk containing low-salinity water and its combination with bacteria. The results indicated G. Stearothermophilus led to the formation of biosurfactants, resulting in a reduction in IFT for both acidic and basic asphaltene. Moreover, the interaction between asphaltene and G. Stearothermophilus with higher asphaltene percentages showed a decrease in IFT under both acidic and basic conditions. Additionally, the study found that the interaction between acidic asphaltene and G. stearothermophilus, in the presence of CaCl2, NaCl, and MgCl2 salts, resulted in a higher formation of biosurfactants and intrinsic surfactants at the interface of the two phases, in contrast to the interaction involving basic asphaltene. These findings emphasize the dependence of the interactions between asphaltene and G. Stearothermophilus, salt, and bacteria on the specific type and concentration of asphaltene.
摘要：
在提高采收率(EOR)工艺中,界面张力(IFT)对渣油采收率的影响已成为影响渣油采收率的关键因素。表面活性剂和生物表面活性剂的使用可以降低IFT并通过降低IFT来提高石油采收率。原油中的沥青质具有作为表面活性材料的结构能力。在微生物强化采油(MEOR)中，生物表面活性剂生产，即使是少量的，是降低IFT的重要机制。本研究旨在通过使用NaCl结合低生物表面活性剂值和低盐度水研究流体/流体相互作用，浓度为0、1000和5000ppm的MgCl2和CaCl2盐，还有嗜热脂肪地芽孢杆菌.通过评估IFT，这项研究调查了0、1和5wt的不同百分比。％的不同沥青质，其中含水体积含有低盐度水及其与细菌的组合。结果表明，嗜热G.Stearothermophilus导致了生物表面活性剂的形成，导致酸性和碱性沥青质的IFT减少。此外，在酸性和碱性条件下，沥青质与嗜热G.Stearothermophilus之间的相互作用表明，在酸性和碱性条件下，IFT均降低。此外,研究发现，酸性沥青质与嗜热硬脂酵母之间的相互作用，在CaCl2，NaCl，和MgCl2盐，导致在两个相的界面处形成更多的生物表面活性剂和固有表面活性剂，与涉及碱性沥青质的相互作用相反。这些发现强调了沥青质和G.Stearothermophilus之间相互作用的依赖性，盐,和细菌对沥青质的具体类型和浓度。
