مطالعه آزمایشگاهی اثر ذرات LCM بر گرادیان شکست سازند جهت بهبود 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، ا یران

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

4 دانشکده نفت، دانشگاه صنعتی امیرکبیر

5 گروه پژوهش و فناوری‌های حفاری و تکمیل چاه، پژوهشگاه صنعت نفت

چکیده

سیال حفاری نقش بسیار مهمی در طول عملیات حفر یک چاه بازی می‌کند و می‌تواند عامل وقوع بسیاری از مشکلات و یا درمان به‌موقع چالش‌ها باشد. ازجمله این چالش‌ها می‌توان به هرز روی سیال اشاره کرد که هزینه و زمان عملیاتی را به‌شدت بالا می‌برد. راه‌حل کلیدی جهت حل این مشکل، بهبود فشار قابل تحمل سازند و مقاوم‌سازی دیواره‌ی چاه به کمک سیال حفاری است. هدف این مطالعه، طراحی و ساخت دستگاه «ارزیابی مقاوم‌سازی دیواره‌ی چاه» جهت شبیه‌سازی فرآیند شکست سازند و بررسی اثر ذرات کنترل‌کننده‌ی هرز روی (LCM) بر بهبود خواص پوششی گل و گرادیان شکست سنگ می‌باشد. لذا در این مقاله از مغزه‌های استوانه‌ای بتنی به‌عنوان نمونه سنگ استفاده‌شده و گل پایه آبی بنتونایتی حاوی 2 نوع مختلف LCM به‌عنوان سیال حفاری در نظر گرفته‌شده است. نتایج آزمایش‌های انجام‌شده نشان می‌دهد که افزودن LCM‌های مختلف به سیال حفاری، می‌تواند منجر به افزایش فشار شکست سنگ (FBP) و فشار بازشدگی مجدد شکاف (FRP) در نمونه‌های بتنی شود و به ترتیب تا 33 و 72 درصد به بهبود آن‌ها کمک کند. درنتیجه می‌توان قبل از ورود به سازندهایی که امکان هرز روی در آن‌ها بالاست، به‌طور پیوسته از ذرات LCM در سیال حفاری جهت بالا بردن فشار شکست سازند، استفاده کرد.

کلیدواژه‌ها


عنوان مقاله [English]

An Experimental Study of LCM Effect on Formation Fracture Gradient to Improve Wellbore Strengthening

نویسندگان [English]

  • Seyed Morteza Mirabbasi 1
  • Mohammad Javad Ameri Shahrabi 2
  • Farid Reza Biglari 3
  • Mohsen Karami 4
  • Ali Reza Nasiri 5
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
4 Petroleum Eng. Department, Amirkabir University of Technology, Tehran, Iran
5 Drilling technologies and well completion research, Research Institute of Petroleum Industry
چکیده [English]

Drilling fluid plays an important role during the drilling operation of a well and can lead to a lot of problems or cure different challenges. Loss circulation is one of these challenges, which can increase non-productive time and operation costs, dramatically. The key solution for solving this problem is to increase the pressure-bearing capacity of the formation and to strengthen the wellbore with the help of drilling fluid. The purpose of this study is to design the "Wellbore Strengthening Evaluation" apparatus to simulate the formation fracturing process and investigate the LCM effects on the improvement of mud properties and rock fracture gradient. Therefore, in this paper, the cylindrical concrete cores are used as rock samples and Water-based bentonite drilling mud containing two different types of LCM are considered as drilling fluid. The results of experiments show that the addition of different LCMs to the drilling fluid leads to an increase in the formation breakdown pressure (FBP) and fracture reopening pressure (FRP) to 33 and 72%, respectively. Therefore, before drilling a formation with the possibility of loss circulation, it is an effective practice to add LCM particles in the drilling fluid to increase the fracture pressure of the formation.

کلیدواژه‌ها [English]

  • Wellbore Strengthening
  • Experimental Evaluation
  • Loss Circulation Material
  • Preventive Approach
  • Formation Fracture Gradient
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