低场核磁共振用于原位原油组成分析及降黏剂评价
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Low Field Nuclear Magnetic Resonance for In-situ Composition Analysis of Crude Oil and Evaluation of Viscosity Reducer
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    摘要:

    采用低场核磁共振(LF-NMR)技术分析了塔河超稠油的组成,并基于塔河超稠油的组成设计了4种油溶性降黏剂(脂肪族,芳香族,芳香族+脂肪族,极性化合物);综合采用LF-NMR方法、黏度分析、和浸泡稀释法评价了4种降黏剂对塔河超稠油的降黏效果。原油族组分(SARA)分析结果验证了LF-NMR技术可以用于精确分析原油组成。除极性化合物降黏剂外,其余3种降黏剂均可使超稠油的黏度降低 90%以上,降黏剂的降黏性能排序为:芳香族>脂肪族+芳香族混合物>脂肪族>极性化合物。芳香族降黏剂降黏效果最好,可将稠油黏度从61 000 Pa·s(50 ℃)降低至 14.897 Pa·s;具有溶解沥青质和防止沥青质聚集的能力。实验结果证明了 LF-NMR不仅可以作为一种快速方便的方法分析原油组成,同时可以用于评价降黏剂效果,并且帮助分析降黏机理。

    Abstract:

    The composition of Tahe ultra-heavy oil was analyzed by low field nuclear magnetic resonance(LF-NMR). Based on the composition of Tahe ultra-heavy oil,four oil-soluble viscosity reducers based on aliphatic,aromatic,aromatic + aliphatic,polar compounds were developed;and their viscosity-reducing effect was comprehensively evaluated by LF-NMR,viscosity analysis, and immersion dilution. The analysis results of crude oil group components(SARA)verified the accuracy of LF-NMR technology in analyzing crude oil composition. Except the polar compound viscosity reducer,other viscosity reducers could reduce the viscosity of ultra-heavy oil by more than 90%. The viscosity reducing performance was ranked by aromatic > mixture of aliphatic and aromatic > aliphatic > polar compound. Aromatic viscosity reducer had the best viscosity reducing effect and could reduce the viscosity from 61 000 000 mPa·s(50 ℃)to 14 897 mPa·s. At the same time,it could dissolve asphaltene and prevented asphaltenes from agglomerating. The experimental results proved that LF-NMR could not only be used as a fast and convenient method to analyze the composition of crude oils,but also be used to evaluate the effect of viscosity reducers,as well as to analyze the mechanism of viscosity reduction.

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涂 东,周晓冬,袁成东,丁 磊,AL-MUNTASER Ameen A,赵忠文,吴文明,VARFOLOMEEV Mikhail A.低场核磁共振用于原位原油组成分析及降黏剂评价[J].油田化学,2024,41(4):714-717.
TU Dong, ZHOU Xiaodong, YUAN Chengdong, DING Lei, AL-MUNTASERAmeenA, ZHAO Zhongwen, WUWenming, VARFOLOMEEV Mikhail A. Low Field Nuclear Magnetic Resonance for In-situ Composition Analysis of Crude Oil and Evaluation of Viscosity Reducer[J]. OILFIELD CHEMISTRY,2024,41(4):714-717.

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  • 在线发布日期: 2025-01-12
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