مقایسه و طراحی سایز بهینه مش در مدل دینامیک سیالات محاسباتی تمیزکاری چاه

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 دانشکده مهندسی مکانیک، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

تقریباً بیست و پنج درصد زمان انتظار ناخواسته در دکل‌های حفاری ناشی از زمان‌های صرف‌شده برای تمیزکاری چاه است. با فراگیری سیستم‌های کامپیوتری قدرتمند فرآیندهای شبیه‌سازی عملیات تمیزکاری چاه و تهیه مدل از چاه‌های عملیاتی رو به گسترش بوده و این عمل ضمن افزایش دقت و بهره‌وری برای اجرا در میادین عملیاتی، از صرف زمان و هزینه‌های بسیاری جلوگیری می‌نماید. در پژوهش حاضر تلاش شده تا با استفاد از دینامیک سیالات محاسباتی مدلی بر پایه آزمایش‌های تجربی انجام پذیرفته در حلقه جریان آزمایشگاه حفاری، طراحی و صحت‌سنجی گردد و با بررسی مدل حاضر با تعدادی مدل مشابه و نتایج آزمایشگاهی، بتوان مش بهینه و اثر آن بر افزایش دقت نتایج و همچنین بازدهی و سرعت شبیه‌سازی را مطالعه نمود. همچنین با مقایسه مدل تجربی جدید و مدل پیشین بهبودهای فیزیکی برای شبیه‌سازی محیط درون‌چاهی مانند افزودن نازل و سرمته و جایگیری خروجی جریان مشاهده و یک مدل CFD طراحی شده بر اساس مدل تجربی قدیمی نیز با این مدل CFD بهینه و طراحی شده برمبنای مدل تجربی جدید مقایسه شده و با بررسی دقت و زمان اجرای هر یک، مش بهینه انتخاب گردد.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison and Design of Optimal Mesh Size in Computational Fluid Dynamics Model of Well Cleaning

نویسندگان [English]

  • Mohammad Bagher Homayoun 1
  • Mohsen Dehvedar 1
  • Amir Hossein Ashhar 2
1 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
2 Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

The first and most important task of drilling fluid is to help clean the borehole and transport drilling cuttings to the surface. In addition, approximately twenty-five percent of unwanted waiting time on drilling rigs is due to time spent on well cleaning. With the acquisition of powerful computer systems, the processes of simulating well-cleaning operations and preparing models of operational wells are expanding, and this practice, while increasing accuracy and productivity for implementation in operational fields, avoids spending a lot of time and money. In the present research, an attempt has been made to design and validate a model based on experimental tests conducted in the flow loop of the drilling laboratory by using computational fluid dynamics, and by examining the current model with a number of similar CFD models and laboratory results, the optimal mesh and its effect on increasing the accuracy of the results have been studied as well as the efficiency and speed of the simulation. Also, by comparing the new experimental model and the previous experimental model, physical improvements for simulating the wellbore environment, such as adding a nozzle and bit and replacing the flow output is observed, and a CFD model designed based on the old experimental model and this optimized CFD model designed based on the new experimental model has also been compared. and by checking the accuracy and execution time of each one, the optimal mesh is selected.

کلیدواژه‌ها [English]

  • Cutting Transport
  • Borehole Cleaning
  • Two-phase Fluid Mechanics
  • Computational Fluid Dynamics
  • Mesh Independancy
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