بررسی آزمایشگاهی رفع گیر اختلاف فشاری با تغییر در خواص و افزایه های موجود در سیال حفاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی معدن و متالورژی، دانشگاه صنعتی امیرکبیر، تهران، ایران

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

3 دانشکده مهندسی نفت، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

گیر اختلاف فشاری در چاه یکی از شایع ترین و درعین حال دردسرآفرین‌ترین مشکلات حفاری چاه‌های نفت است. در این مقاله با تکیه بر مطالعات انجام شده در زمینه رفع گیر اختلاف فشاری به کمک افزایه‌های گل حفاری، گل‌های پایه آبی بنتونایتی و لیگنوسولفونایتی مورد مطالعه قرارگرفته است. انتخاب افزونه مناسب به کمک دستگاه خواص سنجی کیک گل با اندازه‌گیری مقاومت پیچشی کیک گل به عنوان متغیر اصلی در کنار اندازه‌گیری سایر متغیرهای فرعی شامل وزن گل، گرانروی گل، دمای آزمایش، میزان افت صافاب، ضخامت کیک گل و ساختار فیزیکی کیک گل انجام شد. نتایج حاصل از آزمایش‌ها حاکی از آن است که در گل‌های بنتونایتی، نمک به عنوان عامل مخرب و PAC به عنوان عامل مؤثر در رفع گیر می باشد. سیالات لیگنوسولفونایتی نیز با خاصیت تینری خود در رفع گیر اختلاف فشاری مفید واقع شدند. آنچه می‌توان به عنوان دستاورد این مقاله در نظر گرفت توجه به چرخش کم لوله حفاری در ابتدای وقوع گیر است که با توجه به اندازه‌گیری‌های مقاومت پیچشی رشته حفاری در کیک گل، روش بسیار مؤثری می باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Study of Freeing Stuck Pipe by Changing in Characterization and Additives of Mud Cake

نویسندگان [English]

  • E. Azad 1
  • S. Yousefirad 2
  • M. DEHVEDAR 3
  • P. Moarefvand 1
1 Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
2 Department of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, Iran
3 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

Differential sticking is one of the most usual and as yet most troublesome problem in drilling. In this paper according to studies on freeing differential sticking by different properties of mud drilling additives, we focused on the impact of water-based mud, bentonite and lignosulfonate. Selecting the appropriate additives are done by mud cake characterization equipment, by measuring the torsional resistance of mud cake with different compositions as the main variable and also measuring secondary variables that consists of mud-weight, mud cake viscosity, Ambient temperature, water loss, mud cake thickness and its physical structure. The results of these tests indicate that in bentonite muds, salt plays role as a destructive factor and PAC as an effective factor in freeing stuck pipe. Lignosulfonate fluid is also effective in freeing differential sticking by its thinner properties. As the main result of this paper, regarding to measurement of torsional resistance in different mud cake, the best method for freeing pipe stuck is low angle rotation of drill string immediately after occurring the pipe stuck.

کلیدواژه‌ها [English]

  • Differential sticking
  • Lignosulfonate
  • torsional resistance
  • mud cake
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