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Effect of combining rules on modeling of asphaltene precipitation

机译：结合规则对建模的影响沥青质沉淀

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Asphaltene deposition causes serious problems in the oil industry and reduces oil recovery. Deposition happens as a consequence of asphaltene precipitation which is a process as a result of a change in thermodynamic stability. Thus, prediction and preventing of the precipitation condition are the first step of preventing asphaltene precipitation and deposition. In this study, a thermodynamic model for asphaltene precipitation has been developed using Peng–Robinson (PR), Soave–Redlich–Kwong (SRK), and a new modification on SRK [modified-SRK equations of state (EOS)]. To modify EOS for non-pure sample (oil sample), van der Waals mixing rule with three types of combining rule containing conventional, Margules, and van Laar type was used. In addition, to verify the derived model, the experiments were conducted on a live oil sample to investigate the effect of pressure reduction and gas injection [nitrogen (0.1, 0.2, and 0.4 mol fraction) and first stage gas (0.2, 0.4 and 0.6 mol fraction)] on asphaltene precipitation. The results show that at low pressures (pressures below 5000 psia), nitrogen is not soluble in oil and the injection of nitrogen reduces asphaltene precipitation because of the liberation of the light component from crude oil; however, increasing the pressure (pressures above 6000 psia) increases the solubility of nitrogen and increases the asphaltene precipitation. For the first stage gas injection, asphaltene precipitation increases because of its high solubility in crude oil at any pressure. The amount of asphaltene precipitation due to first stage gas injection is higher than nitrogen injection except at nitrogen concentration and pressures near the bubble point (pressure of 7000 psia and nitrogen injection of 0.1 mol fraction). According to the modeling results, van Laar type combining rule in conjugated with modified-SRK-EOS predicts the amount of asphaltene precipitation very well at all situations of pressures and different gas injections, and h
机译：沥青质沉积引起的严重问题石油行业,降低采油。由于沥青质发生沉积降水过程的结果热力学稳定性的变化。降水的预测和预防条件是预防的第一步沥青质沉淀和沉积。研究中,沥青烯的热力学模型沉淀了和一个新的修改SRK [modified-SRK方程的状态(EOS)]。纯样品(石油样品),范德瓦耳斯混合规则与三种类型的组合规则Laar Margules包含传统,范使用类型。模型,实验现场石油样本调查的压力的影响减少和注气氮(0.1,0.2,和0.4摩尔分数)和第一阶段气体(0.2,0.4和0.6摩尔分数)在沥青质降水。压力(压力低于5000 psia),氮不溶于石油和注入氮降低沥青质沉淀的原因解放的光组件原油;(压力高于6000 psia)增加了溶解性氮和增加了的沥青质沉淀。注入,沥青质沉淀增加因为它的高溶解在原油任何压力。由于第一阶段降水注气高于氮注入除了在氮泡点附近的浓度和压力(7000 psia和氮气注入压力0.1摩尔分数)。结果,van Laar类型的规则相结合共轭modified-SRK-EOS预测沥青质沉淀量很好不同情况下的压力和气体注射,和h

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