مدل‌سازی ترمودینامیکی و آنالیز حساسیت‌ تشکیل رسوب آسفالتین در نفت خام

نوع مقاله: مقاله پژوهشی

نویسندگان

1 مرکز مطالعات ازدیاد برداشت، پژوهشکده مهندسی نفت، پژوهشگاه صنعت نفت

2 دانشکده نفت اهواز، دانشگاه صنعت نفت

چکیده

در این مقاله برای پیش‌بینی رسوب آسفالتین از دو روش استفاده گردید. در روش اول، تئوری پلیمری فلوری-هاگینز و در روش دوم مدل رسام‌دانا و همکاران به عنوان مدل پایه مورد استفاده قرار گرفت. ابتدا پارامتر حلالیت آسفالتین، به صورت تابعی از فشار در نظر گرفته شد و سپس مقدار این پارامتر در فشارهای مختلف تعیین گردید. هدف، تطبیق منطقی نتایج حاصل از مدل با داده‌های رسوب آسفالتین حاصل از آزمایش می‌باشد. پارامتر حلالیت آسفالتین مورد استفاده در روش اول از مقادیر گزارش شده در مقالات، کمتر بود ولی نتایج حاصل از روش دیگر، مقادیر پارامتر حلالیت آسفالتین را در محدوده قابل قبولی ارائه داد. در نهایت یک رابطه تجربی برای پیش‌بینی پارامتر حلالیت آسفالتین در فشارهای مختلف برای دو نمونه نفتی به‌دست آمد که مقدار این پارامتر را با خطای کمتری محاسبه می‌نماید.
 

کلیدواژه‌ها


عنوان مقاله [English]

Thermodynamic Modeling and Sensitivity Analysis of Asphaltene Precipitation in Crude Oil

نویسندگان [English]

  • Abbas Shahrabadi 1
  • Seyyed Saeid Moezi 2
  • Hasan Mahmoudian 1
  • Ghorbanali Sobhi 1
  • Mohammad Jamialahmadi 2
1 Research Institute of Petroleum Industry, Petroleum Research, RIPI, Tehran
2 Petroleum University of Technology
چکیده [English]

In this paper, two models, namely the Flory-Huggins (polymer) solutions theory and the model developed by Rassamdana and co-workers, which served as our basic model, were employed for estimating asphaltene precipitation. In the analyses, the asphaltene solubility parameter was initially considered as a function of pressure and was subsequently adjusted by varying the pressure with an aim of logical adjustment of the results with the asphaltene precipitation experimental data. The values established for the asphaltene solubility parameter in the first approach were somewhat underestimated compared to the reported values in the literature; however, the second approach gave more acceptable results. Finally, an empirical expression was proposed for asphaltene precipitation solubility estimation for the two oil samples with enhanced accuracy at different pressures.

کلیدواژه‌ها [English]

  • Asphaltene Precipitation
  • Crude Oil
  • Rassamdana Model
  • Flory Huggins Theory
  • Solubility Parameter

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