مدل‌ دو - سه درجه آزادی سیستم ضد چسبندگی- لغزش رشته حفاری

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه صنعتی سهند، تبریز، ایران

چکیده

رشته حفاری به دلیل طول زیاد آن و نیروی‌های دینامیکی ناشی از اندرکنش مته و سنگ در معرض ارتعاشات شدید قرار دارد.‌‌ ابزار ضد چسبندگی- لغزش که در انتهای رشته حفاری و درون تجهیزات ته‌چاهی قرار دارد، مانع از وقوع چسبندگی-لغزش و ارتعاشات پیچشی ناشی از آن می‌شود. در این پژوهش یک مدل جدید برای تحلیل ابزار ضد چسبندگی- لغزش ارائه شده است که محدودیت‌های مدل‌های قبلی برای مدل‌سازی رشته حفاری به همراه ابزار ضد چسبندگی- لغزش را ندارد. زمانی که ابزار در حالت غیرفعال قرار دارد، سیستم با دو درجه آزادی مدل‌سازی شده و ابزار مانند یک جسم صلب رفتار می‌کند. با فعال شدن ابزار یک درجه آزادی با توجه به قید سینماتیکی ابزار به مدل اضافه شده و سیستم به صورت یک مدل سه درجه آزادی خواهد بود. بر اساس مدل ارائه شده و شرط‌های تعیین شده، ابزار بین حالت‌ غیرفعال با دو درجه آزادی و حالت فعال با سه درجه آزادی تغییر وضعیت می‌دهد. نتایج به دست آمده از شبیه‌سازی، حاکی از رفتار منطقی ابزار در حضور نیرو و گشتاورهای خارجی وارد بر دو بخش ابزار می‌باشد. مدل ارائه شده به خوبی اثر وزن روی مته و وزن روی قلاب نگهدارنده در فعال‌سازی ابزار را نشان می‌دهد. با استفاده از مدل ارائه شده و در یک حالت مشخص، رفتار غیر‌‌خطی ابزار که ناشی از تغییر وضعیت بین دو دستگاه معادلات دیفرانسیل خطی می‌باشد، نشان داده شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Two-three degree of freedom model for Anti Stick-Slip Tool of drill-string

نویسندگان [English]

  • Amin Taraghi Osguei
  • behrouz Mohammad Alizadeh
  • Atabak Dobakhti
Sahand University of Technology, Department of Mechanical Engineering, Tabriz, Iran
چکیده [English]

The drill-string experiences strong vibrations due to its length and interactions with the rock at the bit. The Anti Stick-Slip Tool (ASST), located at the end of the drill-string, effectively prevents the stick-slip and torsional vibrations. A new model has been proposed to analyze the tool, overcoming previous limitations. The model represents the system with two degrees of freedom in its non-activated state and three degrees of freedom when activated based on kinematic constraints. Simulations demonstrate the logical behavior of tools under external forces and torques. The model accurately depicts the effect of weight on bit and weight on the hook on the activation of tool. The proposed model enables researchers to study the nonlinear behavior of ASST resulting from switching between equations in specific operational conditions.

کلیدواژه‌ها [English]

  • Torsional Vibration
  • Drill-string
  • Anti Stick-Slip Tool
  • Internal Friction
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