ارائه‌ی یک مدل تحلیلی پوروالاستیک جهت ارزیابی عملکرد ذرات LCM در مقاوم‌سازی دیواره‌ی چاه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده نفت دانشگاه صنعتی امیرکبیر، تهران، ایران

2 دانشیار دانشکده مهندسی نفت دانشگاه صنعتی امیرکبیر، تهران، ایران

3 دانشیار دانشکده مهندسی مکانیک دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

یکی از مهمترین مشکلات در حین عملیات، هرزروی سیال حفاری می‌باشد که منجر به اتلاف هزینه‌ و زمان مفید عملیات می‌گردد. تجربیات میدانی و مطالعات پژوهشی نشان می‌دهد که «مقاوم‌سازی دیواره‌‌ی چاه (WBS)» رویکردی مؤثر برای کنترل و یا درمان این چالش است. درواقع انسداد ترک‌های موجود در دیواره‌ی چاه با استفاده از ذرات کنترل‌کننده‌ی هرزروی (LCM)، توزیع تنش و فشار سیال را بر دیواره‌ی چاه و سطوح ترک‌، تغییر داده و احتمال هرزروی را کاهش می‌دهد. در این مقاله تلاش شده است تا با بکارگیری مفاهیم مکانیک شکست، یک مدل تحلیلی پوروالاستیک ارائه شود و عوامل مؤثر بر تنش‌های حول دیواره‌ی چاه و نوک ترک، ارزیابی گردد. نتایج بدست آمده از آنالیز حساسیت بر روی پارامترهای مختلف نشان می‌دهد که پارامترهای ژئومکانیکی (ناهمسانگردی تنش‌های برجا)، پارامترهای هندسی (محل تشکیل پلاگ LCM، طول شکاف) و پارامترهای پوروالاستیک سازند (فشار مخزن و ضریب بیوت)، اثر قابل ملاحظه‌ای بر میزان موفقیت WBS دارند. بر طبق این نتایج، مقاوم‌سازی دیواره‌ی چاه، در شرایط تنش همسانگرد، سازند کم‌فشارتر و طول شکاف کمتر، مؤثرتر می‌باشد؛ چراکه تمرکز تنش در نوک ترک، کمتر بوده و احتمال رشد آن کاهش می‌یابد. همچنین، هرچه محل تشکیل پلاگ LCM به دهانه‌ی شکاف، نزدیک‌تر باشد مقاوم‌سازی بهتر انجام می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

An Analytical Poroelastic Model to Study the LCM Performance during the Wellbore Strengthening

نویسندگان [English]

  • Seyed Morteza Mirabbasi 1
  • Mohammad Javad Ameri 2
  • Farid Reza Biglari 3
  • Ashkan Shirzadi 1
1 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
2 Associate Professor; Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
3 Associate Professor; Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

One of the most challenging problems during drilling operations is loss circulation, which can result in wasting productive time and operation costs. Different studies and field experiences indicate that wellbore strengthening (WBS) is a practical approach to prevent or treat this problem. Plugging the wellbore fractures with lost circulation materials (LCMs) changes the stress distribution on the wellbore wall and fracture tip, leading to decrease the fluid loss possibility. In this paper, it has been attempted to introduce a poroelastic analytical model to investigate the effective factors on wellbore stresses based on fracture mechanics. The sensitivity analysis on different factors shows that geomechanical parameters (in-situ stress anisotropy), geometry parameters (LCM plug location, fracture length), and poroelastic properties (formation pore pressure and biot coefficient) have a significant effect on WBS. Based on the modeling results, the closer the LCM bridge location to the fracture mouth, the better strengthening can be achieved, and it can be more effective in the isotropic stress conditions, low-pressure formations and for a shorter fracture, due to less stress concentration on the fracture tip.

کلیدواژه‌ها [English]

  • Analytical Study
  • Lost Circulation
  • Stress Intensity Factor
  • Sensitivity Analysis
  • Fracture Plugging
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