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
[1]. Hirschberg A., Dejong L. N. J., Schipper B. A. and Meijer J. G., Influence of temperature and pressure on asphaltene flocculation, Soc Petrol Eng J 1984:283B2
[2] flory, P., Huggins, M., J.Chem. Phys. 9. PP. 440, 660
[3]. Mansoori G. A., and Jiang T. S., Asphaltene deposition and its role on enhanced oil recovery, Proceeding of the 3rd European Conference on Enhanced oil Recovery, Rome, Italy, 1985.
[4]. Burke N. E., Hobbs R. D., Kashou S. F., “Measurement and modeling of asphaltene precipitation”, J. Pet. Technol. , 42 (11), 1440-1446., 1990.
[5]. Cimino R., Correra S., Del Bianco A., Lockhart T. P., “Solubility and phase behavior of asphaltenes in hydrocarbon media”, In Asphaltenes: Fundamentals and Applications; Sheu, E. Y., Mullins, O. C., Eds.; Plenum Press: New York, 1995; pp 97-130.
[6]. Rassamdana H., Dabir B., Nematy M., Farhani F. and Sahimi M., “Asphalt flocculation and deposition: I. the onset of precipitation”, AIChE J. 1996, 42, pp 10-22.
[7]. Leotaritis K. J., “Asphaltene near-wellbore formation damage modelling”, SPE Formation Damage Control Conference, Louisiana, SPE 39444, 1998.
[8]. Victorov A. I., and Firoozabadi A., “Thermodynamic of asphaltene precipitation in petroleum fluids by micellization model”, AICHE Journal,42, pp. 1753, 1996.
[9]. Smirniva N. A., Victorov A. I., and Kuranov G. L., “New application of equation of state in molecular models of complex fluid mixtures”, Fluid Phase Equilibria, 150-151, pp161, (1998)
[10]. Pan H., and Firoozabadi A., “Thermodynamic micellization model for asphaltene precipitation: micellar growth and precipitation”, SPE Production and Facilities Journal, May 1998, 118-127.
[11]. Won K. W., “Thermodynamics for solid-liquid-vapor equilibria: wax phase formation from heavy hydrocarbon mixtures”, Fluid Phase Equilibria, Vol. 30, 265-279, 1986.
[12]. Chung T. H., “Thermodynamic modeling for organic solid precipitation”, Paper SPE 24851, Presented at 1992 SPE Annual Technical Conference and Exhibition, Washinton, DC, Oct. 4-7, pp. 869-878.
[13]. Nghiem, L.X., Hassam, M.S. and Nutakki, R., “Efficient modelling of asphaltene precipitation”, SPE Annual Technical Conference and Exhibition, Houston, TX,SPE 26642, 1993.
[14]. Nghiem L. X.,Coombe D. A., and Ali F., “Compositional simulation of asphaltene deposition and plugging”,
SPE 73rd Annual Technical Conference and Exhibition, New Orleans, Louisiana, SPE 48996, 1998.
[15]. Kohse B. F., Nghiem L. X., Maeda H., and Ohno K., “Modelling phase behavior including the effect of pressure and temperature on asphaltene precipitation”, Proceeding SPE Asia Pasific Oil and Gas Conference and Exhibition, Brisbane, Australia, SPE 64465, 2000.
[16]. Gross J., Sadowski G., “Perturbed-cain SAFT: An equation of state based on a perturbation theory for chain molecules”, Ind. Eng.Chem.Res,40, pp1244, 2001.
[17]. Akbarzadeh K., A new thermodynamic model for prediction of asphaltene precipitation at different conditions, PhD Thesis, University of Shiraz, 1380.
[18]. Danesh A, PVT and phase behaviour of petroleum reservoir fluids (developments in petroleum science), 47, Elsevier, 1998.
[19]. Riazi M. R, Characterization and properties of petroleum fractions, First Edition, ASTM, Philadelphia, 2005.
[20]. Mousavi-Dehghani S. A., Mirzayi B. and Vafaie-Sefti M. “Polymer solution and lattice theory applications for modeling of asphaltene precipitation in petroleum mixtures”, Brazilian Journal of Chemical Engineering, Vol. 25, No. 03, pp. 523 - 534, July - September, 2008.