بررسی اثر عدد موئینگی و جریان غیردارسی بر عملکرد تولید از مخازن گاز میعانی در میدان گازی پارس جنوبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهنده/پژوهشکده ازدیاد برداشت، مدیریت پژوهش و فناوری شرکت ملی نفت

2 پژوهنده/پژوهشگاه صنعت نفت

چکیده

تشکیل میعانات گازی در اطراف چاه در مخازن گاز میعانی باعث کاهش بازدهی چاه می‌گردد که با توجه به نوع سیال، ویژگی-های مخزن و چاه می‌تواند تشدید گردد. اطلاعات مناسب و کافی می‌‌تواند به مدل‌سازی دقیق یک مخزن گاز میعانی کمک کند. از جمله عواملی که باعث تخمین اشتباه در پیش‌بینی عملکرد مخازن گاز میعانی می‌گردد، وابستگی تراوایی نسبی گاز-نفت به عدد موئینگی و اثرات جریان غیردارسی می‌باشد. در این مقاله یک سکتور از میدان گاز میعانی پارس جنوبی واقع در خلیج فارس به کمک نرم افزار ECLIPSE-300 شبیه‌سازی گردید و اثر عدد موئینگی و جریان غیردارسی بر تولید تجمعی و میزان تشکیل میعانات در اطراف چاه و مخزن مورد بررسی قرار گرفتند. نتایج حاصل از این کار نشان می‌دهد که افزایش دبی تولیدی و کاهش فشار ته‌چاهی باعث افزایش گاز تولیدی شده و از طرفی افت فشار و تشکیل میعانات بیشتری را در پی خواهد داشت. برای تولید بیشینه از مخزن باید مقادیر دبی تولیدی و فشار ته‌چاهی بهینه‌سازی گردد. همچنین، در نظر گرفتن اثر عدد موئینگی باعث کاهش تشکیل میعانات در دیواره چاه و در کل مخزن می‌شود. جریان غیردارسی نیز، باعث افزایش افت فشار و در نتیجه تشکیل میعانات بیشتر در اطراف چاه می‌شود. در نظر نگرفتن اثر عدد موئینگی و جریان غیردارسی در فرآیند شبیه‌سازی، پیش‌بینی صحیح نحوه عملکرد چاه در مخازن گاز میعانی را به شدت تحت تأثیر قرار می‌دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Capillary Number and Non-Darcy Flow on Gas Condensate Reservoirs Performance: A Case Study in South-Pars Gas Condensate Field

نویسنده [English]

  • Saber Mohammadi 2
چکیده [English]

Formation of condensates around the wellbore in gas condensate reservoirs reduces the well performance and it can be intensified depending on the fluid type, reservoir and well properties. Adequate and appropriate information can be helpful for accurate modelling of gas condensate reservoirs. Disregarding the dependence of gas-oil relative permeability on capillary number and high velocity flow (non-Darcy flow) may cause miscalculations and poor estimations in gas condensate reservoirs. In this paper, a sector model of South-Pars gas condensate field located in the Persian Gulf was simulated using ECLIPSE-300, and the effect of capillary number and non-Darcy flow on cumulative condensate production and condensate formation near the wellbore and in the reservoir were investigated. Obtained results reveal that production increases as the bottom-hole pressure decreases and/or production flow rate increases; however, more pressure drop and condensate blockage were occurred. Thus, bottom-hole pressure and production flow rate should be optimized for efficient production. In addition, taking into account the effect of capillary number on relative permeability decreases condensate formation near the wellbore and in the reservoir. Non-Darcy flow increases pressure drop, resulting in more condensate blockage near the wellbore. Ignoring the effect of capillary number and non-Darcy flow in simulation process, will strongly affect the accurate prediction of well performance in gas condensate reservoirs.

کلیدواژه‌ها [English]

  • Relative Permeability
  • Condensate reservoir
  • Capillary number
  • Non-Darcy Flow
  • Simulation

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