مدل یکپارچه شبیه سازی فرایند تشکیل رسوب آسفالتین در دیواره چاه‌های نفتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مدل‌سازی و توسعه نرم‌افزار، پردیس بالادستی، پژوهشگاه صنعت نفت، تهران، ایران

2 گروه ترمودینامیک دانشکده مهندسی شیمی،دانشگاه علم و صنعت ایران، تهران

چکیده

آسفالتین از جمله برش‌های سنگین نفت خام است که رسوب آن در ستون چاه‌های نفت سبب کاهش تولید، افزایش افت فشار و در نهایت توقف جریان نفت می‌شود. تعیین زمان، مکان و مقدار دقیق تشکیل رسوب از جمله نیازهای اصلی برای طراحی برنامه تولید از چاه است. فرآیند تشکیل رسوب آسفالتین دارای سه جنبه ترمودینامیکی، سینتیکی و پدیده‌های انتقال است که مدلسازی فرآیند رسوب نیازمند شناخت دقیق این سه جنبه است. تغییر فاز آسفالتین تابعی از زمان و شرایط ترمودینامیکی آن است. از سوی دیگر حرکت نفت در ستون چاه با انتقال حرارت و افت فشار همچنین تشکیل فاز گاز همراه است. مدلسازی ترمودینامیکی فرآیند رسوب، استفاده صحیح از رابطه سینتیکی و ادغام آنها با معادلات حرکت و حرارت سبب پیچیدگی مدل‌سازی تشکیل رسوب در ستون چاه شده است. در این مطالعه داده‌های تولیدی یک چاه نفتی ایرانی در بازه زمانی 8 ساله مورد مطالعه قرار گرفته است. ابتدا با انجام آزمایش‌های تعادل فاز و مدل ترمودینامیکی جامد، رفتار ترمودینامیکی آسفالتین مدل‌سازی شده است. سپس تغییرات دما و فشار را در چاه با استفاده از معادله حرکت و معادله انتقال حرارت مدل‌سازی شد. در نهایت علاوه بر ادغام معادلات تعادل ترمودینامیکی و انتقال، از رابطه سینتیکی به عنوان رابطه تصحیح کننده برای مدل‌سازی نتایج میدانی استفاده شد. مدل ارائه شده می‌تواند هر سه ویژگی زمان، مکان تشکیل و مقدار رسوب را به خوبی پیش‌بینی کند.
 

کلیدواژه‌ها

عنوان مقاله [English]

An Integrated Model for Asphaltene Deposition in Oil Well Column Simulation

نویسندگان [English]

  • Mahdi Zeinali Hasanvandm 1
  • Seyyed Ali Mousavi Dehghani 1
  • Farzaneh Feyzi 2
  • Reza Mosayebi Behbahani 1
1 Modeling and Software Development Group, Petroleum Exploration and Production Section, Research Institute of Petroleum Industry, Iran
2 Thermodynamics Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

In this study, an innovative approach is presented for modeling asphaltene deposition in the well column. The presented model predicts the time, location and amount of asphaltene deposited in the well column as a function of well, fluid and reservoir properties. The model is formulated based on thermodynamic equilibrium, heat transfer, mass transfer and empirical multi-phase flow equations. Asphaltene-containing oil is sampled from an oil well suffering from periodic deposition problems. The thermodynamic behavior of the oil and depositional characteristics of asphaltene have been determined via laboratory experiments and modeled accordingly using the Peng-Robinson equation of state and the modified solid model, respectively. The pressure profile in the well column was determined based on Duns and Ross two-phase flow model. The temperature profile in the well column has been determined based on a developed model derived from field measurements. Fluid flow and heat transfer equations have been solved simultaneously based on pressure and temperature profiles in the well column. The Escobedo-and-Mansoori model which has been used for mass transfer calculations was used to evaluate the rate of asphaltene deposition onto the wellbore at various depths. The simulated and reported field values of wellhead pressure and temperature were used for evaluation of model predictions. The model had over 95.5% and 99.1% accuracy in predicting the wellhead pressure and temperature, respectively, in a time window of over three months in the studied well.
 

کلیدواژه‌ها [English]

  • Asphaltene
  • deposition model
  • well column
  • transport phenomena

مراجع

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پژوهش نفت
دوره 26، 6-95 - شماره پیاپی 91
بهمن و اسفند 1395
صفحه 91-106

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