Design and formulation of surfactant stabilized O/W emulsion for application in enhanced oil recovery: effect of pH, salinity and temperature

IF 1.8 4区工程技术 Q4 ENERGY & FUELS

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles Pub Date : 2020-01-01 DOI:10.2516/ogst/2020066

Narendra Kumar, Saif Ali, Amit Kumar, A. Mandal

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引用次数: 10

Abstract

Mobilization of crude oil from the subsurface porous media by emulsion injection is one of the Chemical Enhanced Oil Recovery (C-EOR) techniques. However, deterioration of emulsion by phase separation under harsh reservoir conditions like high salinity, acidic or alkaline nature and high temperature pose a challenge for the emulsion to be a successful EOR agent. Present study aims at formulation of Oil-in-Water (O/W) emulsion stabilized by Sodium Dodecyl Sulfate (SDS) using the optimum values of independent variables – salinity, pH and temperature. The influence of above parameters on the physiochemical properties of the emulsion such as average droplet size, zeta (ζ) potential, conductivity and rheological properties were investigated to optimize the properties. The influence of complex interactions of independent variables on emulsion characteristics were premeditated by experimental model obtained by Taguchi Orthogonal Array (TOA) method. Accuracy and significance of the experimental model was verified using Analysis Of Variance (ANOVA). Results indicated that the experimental models were significantly (p < 0.05) fitted with main influence of salinity (making it a critical variable) followed by its interactions with pH and temperature for all the responses studied for the emulsion properties. No significant difference between the predicted and experimental response values of emulsion ensured the adequacy of the experimental model. Formulated optimized emulsion manifested good stability with 2417.73 nm droplet size, −72.52 mV ζ-potential and a stable rheological (viscosity and viscoelastic) behavior at extensive temperature range. Ultralow Interfacial Tension (IFT) value of 2.22E-05 mN/m was obtained at the interface of crude oil and the emulsion. A favorable wettability alteration of rock from intermediate-wet to water-wet was revealed by contact angle measurement and an enhanced emulsification behavior with crude oil by miscibility test. A tertiary recovery of 21.03% of Original Oil In Place (OOIP) was obtained on sandstone core by optimized emulsion injection. Therefore, performance assessment of optimized emulsion under reservoir conditions confirms its capability as an effective oil-displacing agent.

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用于提高采收率的表面活性剂稳定油水乳状液的设计与配方:pH、盐度和温度的影响

通过注入乳化液从地下多孔介质中动员原油是化学提高采收率(C-EOR)技术之一。然而，在高矿化度、酸性或碱性以及高温等恶劣的储层条件下，乳化液会因相分离而变质，这对乳化液能否成为一种成功的提高采收率剂构成了挑战。本文研究了十二烷基硫酸钠(SDS)稳定水包油(O/W)乳状液的配方，选取了矿化度、pH和温度为自变量的最佳值。考察了上述参数对乳液的平均粒径、ζ (ζ)电位、电导率和流变性能等理化性质的影响，以优化乳液的性能。利用田口正交阵列(TOA)法建立的实验模型，研究了自变量间复杂相互作用对乳化液特性的影响。采用方差分析(ANOVA)验证实验模型的准确性和显著性。结果表明，实验模型均显著(p < 0.05)拟合出盐度对乳化液性质的主要影响(使其成为关键变量)，其次是与pH和温度的相互作用。乳化液的预测响应值与实验响应值无显著差异，保证了实验模型的充分性。优化后的乳液具有良好的稳定性，液滴尺寸为2417.73 nm， ζ-电位为- 72.52 mV，在较宽的温度范围内具有稳定的流变(粘度和粘弹性)性能。原油与乳化液界面的超低界面张力(IFT)值为2.22E-05 mN/m。接触角测试表明岩石的润湿性由中湿向水湿转变，混相试验表明岩石与原油的乳化行为增强。通过优化后的乳液注入，砂岩岩心三次采收率达到21.03%。因此，优化后的乳化液在油藏条件下的性能评价证实了其作为一种有效的驱油剂的能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 工程技术-工程：化工

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： OGST - Revue d''IFP Energies nouvelles is a journal concerning all disciplines and fields relevant to exploration, production, refining, petrochemicals, and the use and economics of petroleum, natural gas, and other sources of energy, in particular alternative energies with in view of the energy transition. OGST - Revue d''IFP Energies nouvelles has an Editorial Committee made up of 15 leading European personalities from universities and from industry, and is indexed in the major international bibliographical databases. The journal publishes review articles, in English or in French, and topical issues, giving an overview of the contributions of complementary disciplines in tackling contemporary problems. Each article includes a detailed abstract in English. However, a French translation of the summaries can be provided to readers on request. Summaries of all papers published in the revue from 1974 can be consulted on this site. Over 1 000 papers that have been published since 1997 are freely available in full text form (as pdf files). Currently, over 10 000 downloads are recorded per month. Researchers in the above fields are invited to submit an article. Rigorous selection of the articles is ensured by a review process that involves IFPEN and external experts as well as the members of the editorial committee. It is preferable to submit the articles in English, either as independent papers or in association with one of the upcoming topical issues.