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IFT Assisted Enhancement of Asphaltene Stability in Light/Heavy Oil Using Surfactants
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-08-09 , DOI: 10.1134/s0965544121090097
Majid Razipour 1 , Mohammad Samipour Giri 1 , Nasrollah Majidian 1
Affiliation  

Abstract

Considering numerous issues due to asphaltene precipitation during production and transportation of crude oil, this work aims to postpone the onset point of asphaltene and improve the stability of its colloids in heavy (S) and light oil (D) samples. For this purpose, water/oil interfacial tension (IFT) is measured to evaluate the effect of surfactants as asphaltene inhibitor on heavy and light oil samples from Iranian south fields. Onset of precipitation from oil samples is revealed by sudden change in IFT between deionized water and oil samples through addition of different fractions of n-heptane as precipitant. Surfactants are used to stabilize the asphaltene colloids and prevent asphaltene precipitation from crude oil. However, crude oils of different properties require investigations for appropriate surfactant at optimum concentration to delay asphaltene precipitation. In this work, three surfactants Linear dodecyl-benzene-sulfonic acid (L–DBSA), dodecyl resorcinol (DR) and nonylphenol (NP) are examined for their retarding capabilities of onset point of asphaltene precipitation in oil samples S and D. Also, the involved mechanisms for addition of surfactant to crude oil are analyzed and interpreted. Enhanced stability of crude oil and degree of postpone in onset point follows the order of L–DBSA > DR > NP for heavy oil S and NP > DR > L–DBSA for light oil D owing to nature and chemical structure of surfactants and also properties of crude oil samples. Furthermore, IFT fluctuations for light and heavy oil are similar but the faster onset point and different values of IFT for light oil arise from unstable nature and density difference.



中文翻译:

IFT 使用表面活性剂辅助增强轻/重油中沥青质的稳定性

摘要

考虑到原油生产和运输过程中沥青质沉淀引起的诸多问题,本工作旨在推迟沥青质的起始点,提高其胶体在重油(S)和轻油(D)样品中的稳定性。为此,测量水/油界面张力 (IFT) 以评估表面活性剂作为沥青质抑制剂对伊朗南部油田重油和轻油样品的影响。通过添加不同的n级分,去离子水和油样之间的 IFT 的突然变化揭示了油样沉淀的开始-庚烷作为沉淀剂。表面活性剂用于稳定沥青质胶体并防止沥青质从原油中沉淀。然而,不同性质的原油需要在最佳浓度下研究合适的表面活性剂以延迟沥青质沉淀。在这项工作中,研究了三种表面活性剂线性十二烷基苯磺酸 (L-DBSA)、十二烷基间苯二酚 (DR) 和壬基苯酚 (NP) 对油样SD中沥青质沉淀起始点的延迟能力。此外,还分析和解释了将表面活性剂添加到原油中的相关机制。原油稳定性增强和起始点延迟程度按照重油S的顺序为 L-DBSA > DR > NP由于表面活性剂的性质和化学结构以及原油样品的性质,轻油D 的NP > DR > L-DBSA 。此外,轻油和重油的 IFT 波动相似,但轻油的 IFT 的起始点较快和不同的值是由不稳定的性质和密度差异引起的。

更新日期:2021-08-10
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