مطالعه نحوه جذب آسفالتین روی سطوح سنگ مخزن با به کارگیری مدل ایزوترم لانگ مویر اصلاح شده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی امیرکبیر (پلی تکنیک تهران)، دانشکده نفت

2 پژوهشگاه صنعت نفت، پردیس توسعه صنایع بالادست

چکیده

در این مقاله با استفاده از آسفالتین استخراج شده از یک نمونه نفت خام از میادین نفتی جنوبی ایران و چند مینرال سنگ مخزن مختلف، مقدار جذب سطحی آسفالتین بعد از تعیین غلظت تعادلی با استفاده از دستگاهnm) UV/VIS328) محاسبه شده است. جذب آسفالتین بر روی چهار مینرال کائولن، کلسیت، دولومیت و کوارتز مورد آنالیز و مقایسه قرار داده شد که از میان مینرال‌ها بیشترین جذب برای کائولن مشاهده شد. از مدل لانگ مویر اصلاح شده برای مقایسه بین داده‌های آزمایشگاهی و مدل استفاده شد. پارامترهای مدل لانگ مویر اصلاح شده از چهار مدل خطی با استفاده از روش رگرسیون خطی به دست آمد. نتایج نشان می‌دهد که کائولن، کلسیت و کوارتز از مدل عمومی ایزوترم لانگ مویر پیروی می‌کنند که مؤید این مطلب است که جذب آسفالتین بر روی سطح مینرال آنها به صورت تک لایه صورت می‌گیرد. ولی دولومیت نسبت به سایر مینرال‌ها رفتار متفاوتی از خود نشان داد. دولویت از مدل عمومی ایزوترم لانگ مویر پیروی نمی‌کند، که ثابت نمی‌کند جذب آسفالتین بر روی سطح مینرال به صورت چند لایه صورت می‌گیرد. از مدل ایزوترم لانگ مویر اصلاح شده برای توجیه جذب چند لایه استفاده شد و مشاهده گردید که تطابق خوبی بین خروجی‌های مدل با داده‌های حاصل از نتایج آزمایشگاهی وجود دارد. در کائولن، کلسیت، دولومیت و کوارتز، در Xهای بهینه (در ایزوترم خطی مدل اول)، مقادیر R2 به ترتیب برابر است با 991/0، 994/0، 95/0 و 991/0 می‌باشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

A Study of Asphaltene Adsorption Manner on Reservoir Rock Surfaces with Application of Langmuir Isotherm Modification

نویسندگان [English]

  • Majid Mohammadi 1
  • S. Ali Mousavi Dehghani 2
1 Department of Chemical Engineering, AmirKabir University of Technology, Tehran, Iran
2 Research Institute of Petroleum Industry, Tehran, Iran
چکیده [English]

In this paper, static adsorption tests were performed using asphaltene extracted from a sample of crude oil from Iranian southern oil fields and different reservoir rock minerals. The amount of adsorbed asphaltene was calculated after determining the equilibrium concentration by UV/VIS method (328 nm). The adsorption isotherms of asphaltene on Kaolin, Calcite, Dolomite, and Quartz were analyzed and compared. Among the different minerals, the maximum adsorption was found for Kaolin. Modified Langmuir isotherm was used for comparing between the model and experimental data. Modified Langmuir coefficients were obtained from four linearized modified Langmuir equations by linear regression method. Kaolin, Calcite, and Quartz followed the Langmuir isotherm, indicating that there was the monolayer formation of adsorbed asphaltenes onto the surface; however, the adsorption behavior of Dolomite was different from the others and does not follow the Langmuir isotherm. It indicated the multilayers formation of asphaltenes onto the surface. Multilayer adsorption was justified using the modified Langmuir isotherm. There was good agreement between the model and the experimental data. The values of R2 at their optimum X for Kaolin, Calcite, Dolomite, and Quartz were 0.991, 0.994, 0.95, and 0.991 respectively.
 

کلیدواژه‌ها [English]

  • Asphaltene
  • Reservoir Rock Mineral
  • Monolayer and Multilayer Adsorption
  • Modified Langmuir Isotherm

 

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