Fu Haowei, Xiu Jianlong, Huang Lixin, Yi Lina, Ma Yuandong, Wang Sicai
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China.
Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China.
Molecules. 2025 Jul 4;30(13):2861. doi: 10.3390/molecules30132861.
In the development of high-temperature and high-salinity oil fields, biopolymer scleroglucan flooding technology faces significant challenges. Traditional scleroglucan products exhibit poor injectability and high extraction costs. This study investigated the application potential of the original fermentation broth of exopolysaccharides (EPS) produced by microorganisms in a simulated high-temperature and high-salinity oil reservoir environment. The polysaccharide was identified as scleroglucan through IR and NMR analysis. Its stability and rheological properties were comprehensively evaluated under extreme conditions, including temperatures up to 150 °C, pH levels ranging from 1 to 13, and salinities up to 22 × 10 mg/L. The results demonstrated that EPS maintained excellent viscosity and stability, particularly at 76.6 °C and 22 × 10 mg/L salinity, where its viscosity remained above 80% for 35 days. This highlights its significant viscoelasticity and stability in high-temperature and high-salinity oil reservoirs. Additionally, this study, for the first time, examined the rheological properties of the original fermentation broth of scleroglucan, specifically assessing its injectability and enhanced oil recovery (EOR) performance in a simulated Middle Eastern high-temperature, high-salinity, medium-low permeability reservoir environment. The findings revealed an effective EOR exceeding 15%, confirming the feasibility of using the original fermentation broth as a biopolymer for enhancing oil recovery in extreme reservoir conditions. Based on these experimental results, it is concluded that the original fermentation broth of exhibits superior performance under high-temperature and high-salinity conditions in medium-low permeability reservoirs, offering a promising strategy for future biopolymer flooding in oil field development.
在高温高盐油田开发中，生物聚合物硬葡聚糖驱油技术面临重大挑战。传统的硬葡聚糖产品注入性差且提取成本高。本研究考察了微生物产生的胞外多糖（EPS）原始发酵液在模拟高温高盐油藏环境中的应用潜力。通过红外光谱（IR）和核磁共振（NMR）分析确定该多糖为硬葡聚糖。在高达150℃的温度、1至13的pH值范围以及高达22×10mg/L的盐度等极端条件下，对其稳定性和流变特性进行了全面评估。结果表明，EPS保持了优异的粘度和稳定性，特别是在76.6℃和22×10mg/L盐度下，其粘度在35天内保持在80%以上。这突出了其在高温高盐油藏中的显著粘弹性和稳定性。此外，本研究首次考察了硬葡聚糖原始发酵液的流变特性，具体评估了其在模拟中东高温、高盐、中低渗透率油藏环境中的注入性和提高采收率（EOR）性能。研究结果显示有效的采收率提高超过15%，证实了使用原始发酵液作为生物聚合物在极端油藏条件下提高采收率的可行性。基于这些实验结果，可以得出结论，在中低渗透率油藏的高温高盐条件下， 的原始发酵液表现出优异的性能，为未来油田开发中的生物聚合物驱油提供了一种有前景的策略。
