مطالعه تاثیر مدت زمان تزریق اولیه، پدیده انتشار و نفوذ مولکولی بر اختلاط گاز پایه و عملیاتی در فرآیند ذخیره‌سازی گاز طبیعی در یک مخزن نیتروژنی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی، نفت و گاز، مرکز تحقیقاتی ازدیاد برداشت از مخازن نفتی، دانشگاه شیراز، ایران

2 دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران، ایران

چکیده

با توجه به روند رو به افزایش مصرف گاز طبیعی در جهان، ذخیره‌سازی زیرزمینی گاز به‌عنوان روشی جهت برطرف کردن مشکل عدم تعادل عرضه و تقاضای گاز به خصوص در فصول سرد سال امری اجتناب ناپذیر به نظر میرسد. در مخازنی که جهت ذخیره‌سازی گاز استفاده می‌شوند، تهیه و تزریق گاز پایه بیشترین هزینه عملیات ذخیره‌سازی را در بر می‌گیرد. حضور گاز پایه جهت حفظ فشار مخزن در طول سیکل تولید و همچنین تضمین دبی تحویل‌پذیری مناسب، ضروری می‌باشد. از آنجا که ارزیابی اقتصادی پروژه‌های ذخیره‌سازی از اهمیت به‌سزایی برخوردار است، اخیراً استفاده از مخازن گازی کم کیفیت از جمله مخازن نیتروژنی جهت پروژه‌های ذخیره‌سازی گاز طبیعی مورد توجه قرار گرفته است. بدین‌ترتیب، گاز در جای کم کیفیت مخزن به‌عنوان گاز پایه مورد استفاده قرار می‌گیرد و این امر نه تنها منجر به تأمین دبی تولید بیشتر از مخزن در طول سیکل‌های تولید می‌گردد، بلکه هزینه تهیه و تزریق گاز پایه را نیز تا حد قابل ملاحظه‌ای کاهش می‌دهد. با این حال، مسئله اختلاط گاز کم کیفیت مخزن و گاز طبیعی تزریقی وجود دارد که این پدیده در صورت انتخاب استراتژی مناسب تولید می‌تواند به‌خوبی کنترل گردد. در این مطالعه، یک مخزن متروکه گازی که قسمت عمده ترکیب آن را نیتروژن تشکیل می دهد (85 درصد مولی نیتروژن) جهت اجرای عملیات ذخیره‌سازی گاز طبیعی مورد مطالعه قرار می‌گیرد و تاثیر مدت زمان تزریق اولیه و به تبع آن حجم گاز طبیعی تزریقی اطراف چاه و همچنین عوامل تأثیر‌گذار بر میزان اختلاط در مقیاس مولکولی (پدیده انتشار و نفوذ مولکولی) بر روی کیفیت گاز تولیدی بررسی می‌گردد
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

A Study on Effects of Initial Injection Period, Dispersion, and Diffusion Phenomena on Mixing of Base and Working gas during Natural Gas Storage in a Nitrogen Reservoir

نویسندگان [English]

  • Negar Ansari 1
  • Masood Riazi 1
  • Seyyd Shahabodin Ayatollahi 2
1 Faculty of Chemical and Petroleum Engineering, Shiraz University, Iran
2 Faculty of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
چکیده [English]

Due to the growing consumption of natural gas in the world, underground natural gas storage (UGS), as a way to cope with the imbalance of gas supply and demand especially during cold seasons, seems to be really indispensable. The largest part of investment in a UGS plan development is allocated to providing cushion gas; this gas is required to maintain reservoir pressure during withdrawal cycles and insure adequate deliverability rate. Since economic evaluation of gas storage projects is of great significance, recently implementing UGS in low quality gas reservoirs such as nitrogen reservoirs has become highlighted. In such a case, reservoir low quality gas will be used as cushion and not only it leads to a higher production rate but also it considerably reduces the cost of preparing and injecting cushion gas into the reservoir. However, there may be a problem related to mixing between reservoir low quality gas and natural injecting gas; this phenomenon shall be effectively controlled by choosing the suitable production strategy. This study investigates underground natural gas storage in an abandoned gas reservoir which mainly consists of nitrogen (%85 Nitrogen). The effect of initial injection period and therefore total injection volume around the well, as well as the factors affecting the extent of mixing between reservoir’s low quality gas and injected natural gas in molecular scale such as diffusion and dispersion will be investigated.
 

کلیدواژه‌ها [English]

  • Natural Gas Storage
  • Mixing of Cushion Gas and Working Gas
  • Molecular Diffusion
  • Dispersion
  • Low Quality Gas Reservoirs

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