Benchmarking of Pulsed Field Gradient Nuclear Magnetic Resonance as a Demulsifier Selection Tool with Arabian Light Crude Oils

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-09-01 DOI:10.2118/203820-pa

D. S. Marques, R. White, Sajjad Al-Khabaz, Mustafa Al-Talaq, Jabr Al-Buainain

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引用次数: 1

Abstract

The use of chemical demulsifiers in the treatment of crude oil emulsions is an essential step in processing facilities worldwide. Each production facility requires specific demulsifier reformulations as the crude characteristics change. The assessment of candidate demulsifiers before online field trials is currently done with bottle tests. Such tests are manual, based on water dropout visually measured by operators. The development of a method that can automatically determine the speed and amount of water dropout without the laborious need to manually record water separation would significantly decrease human error. Pulsed field gradient nuclear magnetic resonance (PFG-NMR) is used as a classification tool to qualitatively rank the efficiency of different demulsifiers in breaking Arabian Light emulsions. This imaging method can evaluate demulsifier action based on the emulsion characteristics; for example, rate of sedimentation and coalescence and formation of a dense packed zone (rag layer). The results are validated against field trials performed in gas-oil separation plants (GOSPs) at two Saudi Arabian facilities. There was good agreement between the PFG-NMR method and field trials. The results were found to correspond to the water dropout in the first stage of crude oil treatment in processing plants (production traps).

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脉冲场梯度核磁共振作为阿拉伯轻质原油破乳剂选择工具的标杆试验

在世界各地的加工设施中，使用化学破乳剂处理原油乳液是必不可少的一步。随着原油特性的变化，每个生产设施都需要特定的破乳剂配方。在线现场试验之前对候选破乳剂的评估目前是通过瓶子测试进行的。这种测试是手动的，基于操作员目测的水滴。开发一种可以自动确定滴水速度和水量的方法，而无需手动记录分水情况，这将大大减少人为误差。脉冲场梯度核磁共振（PFG-NMR）作为一种分类工具，用于对不同破乳剂破乳剂的效率进行定性排序。这种成像方法可以根据乳状液的特性来评价破乳剂的作用；例如沉积和聚结的速率以及致密填充区（碎布层）的形成。该结果通过在沙特阿拉伯两个设施的油气分离厂（GOSP）进行的现场试验进行了验证。PFG-NMR方法与现场试验之间有很好的一致性。发现结果与加工厂（生产阱）原油处理第一阶段的失水情况一致。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.