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Laboratory evaluation and numerical simulation of the alkali–surfactant–polymer synergistic mechanism in chemical flooding

机译：化学驱中碱-表面活性剂-聚合物协同作用机理的实验室评估和数值模拟

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Alkali–surfactant–polymer (ASP) flooding, which can reduce interfacial tension (IFT) and the mobility ratio between oil and water phases, has been proven to be effective for enhancing oil recovery in laboratory experiments and field pilots. However, the study of interactions within alkali–surfactant–polymers for chemical flooding is neither comprehensive nor complete until now. Laboratory experiments were conducted and a corresponding numerical simulation model was established to characterize multiple component interactions during the ASP flooding process. Synergistic effects of multiple component interactions on viscosity variation, IFT reduction, and multicomponent adsorption were studied separately. ASP solution viscosity shows non-linear variation behavior with an increasing polymer concentration. Alkali decreases the molecular hydraulic radius of a polymer, and then limits its contribution to viscosity. Oil–water interfacial tension decreases with the join in of polymer which can act as an alternative effect to replace surfactant adsorbed on a mineral surface. Petroleum acid will react with alkali and produce petroleum soap to perform a synergetic action with the surfactant on IFT reduction. Adsorption fraction and diffusion rate of a surfactant will diminish due to rheology improvements caused by a polymer. Alkali can protect a surfactant from adsorption consumption by competitive adsorption. A viscosity non-linear logarithm mixing method, IFT reduction–relative permeability curve interpolation method, and a multicomponent adsorption isotherm model were developed to characterize and simulate the synergistic effects obtained by experiments. A novel ASP flooding numerical simulation model was constructed which coupled the synergistic effects simulation methods of viscosity variation, IFT reduction, and multicomponent adsorption. The numerical simulation result based on the proposed model has better agreement with experiment results compared with that of the traditional model. Validation results proved the effectiveness of the proposed model which can be used to enhance a synergistic mechanism study and field application of ASP flooding.
机译：碱-表面活性剂-聚合物（ASP）驱油可以降低界面张力（IFT）和油相与水相之间的流动性比率，已被证明可有效提高实验室实验和现场飞行员的采油率。但是，到目前为止，关于碱-表面活性剂-聚合物内化学驱油相互作用的研究还不全面也不完整。进行了实验室实验，并建立了相应的数值模拟模型，以表征ASP驱油过程中多组分的相互作用。分别研究了多组分相互作用对粘度变化，IFT降低和多组分吸附的协同效应。 ASP溶液粘度随聚合物浓度的增加而显示非线性变化行为。碱降低聚合物的分子水力半径，然后限制其对粘度的贡献。油水界面张力随着聚合物的加入而降低，这可以替代矿物表面吸附的表面活性剂。石油酸将与碱反应并产生石油肥皂，从而与表面活性剂在降低IFT方面起协同作用。由于聚合物引起的流变性的改善，表面活性剂的吸附率和扩散速率将降低。碱可以通过竞争性吸附保护表面活性剂免受吸附消耗。建立了粘度非线性对数混合方法，IFT折减率-相对渗透率曲线插值方法以及多组分吸附等温线模型，以表征和模拟通过实验获得的协同效应。建立了一种新型的ASP驱油数值模拟模型，该模型结合了粘度变化，IFT降低和多组分吸附的协同效应模拟方法。与传统模型相比，基于该模型的数值模拟结果与实验结果具有更好的一致性。验证结果证明了该模型的有效性，可用于加强ASP驱的协同机理研究和现场应用。

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