Finite element analysis of stick-slip vibrations in drillstrings

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

-Drillstring undergoes several modes of vibrations simultaneously. These vibrations can be classified into three main groups based on their directions: axial, transverse and torsional vibrations. Coupling between these vibrations is possible and it yields uncertainty in vibration analysis and monitoring. Stick-slip in drillstrings is a specific type of torsional vibrarions. Stick-slip involves periodic fluctuations in bit rotational speed, ranging from almost zero velocity to a stage of high rotational speed, often more than twice the surface speed. In this study, a dynamic model of the drillstring is formulated using consistent mass finite element approach. The developed model accounts for the coupling between axial and bending vibrations, the dynamic coupling between bending and torsional vibrations as well as the effect of rotary inertia, gyroscopic moment and gravitational axial stiffening. Stick-slip is modeled using proper downhole boundary conditions, which admit the excitation of stick-slip oscillations. The effects of stick-slip are investigated by studying the associated dynamic responses of the drillstring.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0d123938-1ac6-4bf4-92c7-1375363531a9

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

850432_1.pdf

بيانات النشر

ترجمة العنوان

التحليل الديناميكي لاهتزازات التوقف والانزلاق في محور الحفر باستخدام طريقة العناصر المحدودة

ألقاب المؤلفين

[{"name_ar":"Salem Mohammed Bashmal","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"Yehia A. Khulief ","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Finite element analysis of stick-slip vibrations in drillstrings

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

drillstring vibrations, axial vibration, transverse vibration, torsional vibration, stick-slip, finite element model, rotary inertia

إشراف وإعداد

الإشراف

Yehia A. Khulief

الإعداد

Salem Mohammed Bashmal

الاقتباسات الببليوغرافية