مطالعه آزمایشگاهی تأثیر نرخ نفوذ سرمته و خواص ظاهری کنده های حفاری بر شاخص تمیزکاری چاه‌های جهت‌دار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری؛ دانشکده مهندسی نفت، دانشگاه صنعتی امیرکبیر

2 دانشگاه صنعتی امیرکبیر دانشکده معدن و متالورژی

3 دانشیار دانشکده مهندسی شیمی دانشگاه صنعتی امیرکبیر

4 استادیار دانشگاه تربیت مدرس

چکیده

به دلیل اهمیت ارتباط نرخ نفوذ حفاری و تمیزکاری چاه­های جهت‌دار در کاهش هزینه­های عملیات حفاری، با استفاده از یک دستگاه شبیه‌ساز حفاری جهت­دار، بعد از تعیین زاویه بحرانی، ارتباط این شاخص با پارامترهای مؤثر بر نرخ نفوذ و خصوصیات ظاهری کنده­های تولیدی از قبیل اندازه، شکل و جنس تعیین می­شود. کنده‌های حفاری استفاده شده در این مطالعه آزمایشگاهی، همگی دارای توزیع اندازه مشخصی بوده و در سه جنس ماسه، آهک و سیلیس تست ‌شده‌اند. نتایج این مطالعه بیان می‌کند که استفاده از سرمته­هایی که سنگ را به‌صورت پودری شکل درمی‌آورند، شاخص تمیزکاری را به‌شدت بهبود خواهند داد. اثر وزن اعمالی بر رشته حفاری تا یک نقطه خاصی بوده و بعد از آن شاخص کاهش خواهد یافت. چرخش رشته حفاری نیز رفتار مشابهی را خواهد داشت. نقطه انتهایی و طول بستر کنده‌ها رفتار مشابهی داشتند. کنده‌هایی با چگالی بیشتر ولی اندازه کوچک‌تر شاخص تمیزکاری بهتری را نسبت به کنده‌هایی با دانسیته کمتر ولی اندازه بزرگ‌تر خواهند داشت. همچنین در مواقعی که با توزیع اندازه ذرات مواجه هستیم، اثر شکل ذرات قابل توجه می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental study of the penetration rate impact and drilling cutting properties on the hole cleaning index (HCI) in directional drilling wells

نویسندگان [English]

  • mohsen dehvedar 1
  • PARVIZ MOAREFVAND 2
  • mostafa moraveji keshavarz 3
  • Mohammad Fazaeli zadeh 4
1 Amirkabir University
2 Amirkabir university
3 Amirkabir university
4 Tarbiat Modarres University
چکیده [English]

Summary
Due to the importance of the rate of penetration and hole cleaning in directional wells to reduce the costs, after detection of critical inclination, the relationship between the effective parameters has been studied in an experimental flow loop. The cuttings, used in the tests, have had a specific size distribution in three types of sand, silica and limestone. The results illustrate that the hole cleaning index (HCI) of powder types in comparison to non-powder types is higher. The effects of bit and pipe rotation on the HCI have been studied in this research work. In this regard, there is an optimum point of the HCI for each of these effects. The end point and the length of the cutting bed have the same behavior. The larger density and lower size cuttings, compared to the lower density and larger size cuttings have higher HCI. In addition, the effect of the shape and size distribution of cuttings on the HCI seems to be remarkable.
 Introduction
Reparability, durability, cost, drill ability and many other parameters are important in using the bits. Based on these parameters and the softness or hardness of the formation, a bit is selected. The cuttings that are generated in directional drilling, based on the bit type and formation type, have different sizes, shapes, densities and volumes. In this paper, the hydraulic effect after releasing the wait on bit is discussed. Hole cleaning is a key parameter in extended reach drilling, especially in critical inclination periods, where the probability of the different sticking types is increased. The critical inclination is the angle that has the worst hole cleaning. In this research, by applying discrete angles in laboratory tests, one specific angle is determined as the critical point, and in this regard, the effect of size, shape, density and volume of cuttings are studied.

کلیدواژه‌ها [English]

  • 'hole cleaning index'
  • "penetration rate"
  • 'cutting properties'
  • 'bit''
  • 'directional drilling simulator'
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