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The influence of NaOH on the stability of paraffinic crude oil emulsion

机译：NaOH对石蜡原油乳液稳定性的影响

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摘要

The alkaline-surfactant-polymer flooding using sodium hydroxide as the alkali component to enhance oil recovery at the on shore oil fields at Daqing in China has brought new problems for the oil industry. Even though, the reservoir contained paraffmic crude oil, the alkali added formed stable water-in-crude oil emulsion and de-emulsification process was necessary to separate oil and water. The problems related in the enhanced oil recovery process using the alkaline-surfactant-polymer flooding technique in the Daqing oil field have been investigated in the laboratory using fractions of Daqing crude oil. The oil was separated into asphaltene and aliphatic fractions and then used in an additive free jet oil to form model oils. The emulsion stability of each of the water-in-model oil emulsions formed between water or 0.6 percent sodium hydroxide solution and model oil was investigated. The interfacial properties such as interfacial tension and interfacial pressure of the systems were also measured. These in combination with the chemical nature of the fractions were used to get insight into the problem related to the ASP flooding technique using sodium hydroxide as the alkaline component. The study reveals that the sodium hydroxide solution reacts with fatty acids in the aliphatic fraction of the crude oil and/or with the fatty acids formed from the slow oxidation of long chain hydrocarbons, and form soap like interfacially active components. These accumulate at the crude oil-water interface and contribute to the stability of the oil/water emulsion.
机译：在中国大庆，以氢氧化钠为碱性成分的碱-表面活性剂-聚合物驱提高了油田的采收率，给石油工业带来了新的问题。即使储层中包含石蜡油，添加的碱也能形成稳定的原油中水乳液，并且需要进行反乳化工艺来分离油和水。在实验室中，使用大庆原油的馏分研究了在大庆油田使用碱性表面活性剂-聚合物驱技术提高采收率过程中的相关问题。将该油分为沥青质和脂肪族馏分，然后用于无添加剂喷气油中以形成模型油。研究了在水或0.6％氢氧化钠溶液与模型油之间形成的每种模型水油乳液的乳液稳定性。还测量了系统的界面性质，例如界面张力和界面压力。这些与馏分的化学性质相结合，可用于深入了解与使用氢氧化钠作为碱性组分的ASP驱技术有关的问题。研究表明，氢氧化钠溶液与原油脂肪族部分中的脂肪酸和/或与长链烃缓慢氧化形成的脂肪酸反应，并形成类似界面活性成分的肥皂。它们积聚在原油-水界面处，并有助于油/水乳液的稳定性。

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