Results 81 to 90 of about 568,250 (204)
New Damped-Jerk trajectory for vibration reduction [PDF]
, 2014 This paper derives a jerk-shaped profile to address the vibration reduction of underdamped flexible dynamics of motion system. The jerk-limited profile is a widespread smooth command pattern used by modern motion systems.
BEAREE, Richard
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Advances in Mechanical Engineering, 2019 Stick–slip vibration is common in the oil well drilling process and is detrimental to down-hole equipment and drilling efficiency. In recent years, a new type of drilling technology, torsional impact drilling, has been developed to mitigate the stick ...
Liping Tang, Wei He, Xiaohua Zhu
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Drill-String Torsional Vibration Suppression Using GA Optimized Controllers
, 2009 Failure of drill-strings is very costly in terms of money and time and occurs more frequently than oil companies would like to see. There are many reasons for drill-string failure, such as vibration, fatigue, and buckling.
Y.L. Abdel-Magid +2 more
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Xibei Gongye Daxue Xuebao, 2019 Exploration of oil or gas wells is usually carried out by using drilling system. When the kilometers of drilling system is externally disturbed, the drilling system is prone to undesired stick-slip vibration of the drill-string.
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Study on lateral vibration characteristics of BHA with double-span drill collar
Advances in Mechanical EngineeringThe severe vibration of BHA directly affect the drilling efficiency, borehole trajectory, and wellbore quality. Therefore, it is crucial for developing dynamic mechanics of drill string system by studying the mechanical behavior of BHA.
Zuwen Tao +7 more
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Drill Pipe Dynamic Measurements Provide Valuable Insight Into Drill String Dysfunctions
, 2011 Recently the oil and gas drilling industry has become increasingly interested in drilling dynamics and vibration as a cause of reduced drilling performance, downhole tool and drill string failures. Historically, vibration data has been captured by an MWD
Ryan Graham +2 more
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Vibration Damage Analysis of Bottom Hole Assembly Under Axial Impact Based on Dynamic Analysis
Applied SciencesImpact Drilling Technology is one of the most effective methods for enhancing the penetration rate and efficiency in hard rock formations. Downhole axial vibration impact tools can provide a stable impact load, but they also increase the complexity of ...
Qilong Xue +3 more
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Applied SciencesTo address whirling- and vibration-induced failures in ultra-deep well drill strings caused by high slenderness ratios and complex loading conditions, this study establishes a nonlinear dynamic finite element model for a steel–titanium alloy composite ...
Jianjun Wang +10 more
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Analysis on Mechanics and Reliability of Drill String during Deep Drilling
, 2011 The deep drill string is subjected to many kinds of loading under the condition of vibration and precession, such as tension, compression, bending and torsion, while the temperature and press are very high.
Shang Yu Yang +2 more
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Band Gap Characteristics of Nonrotating Passive Periodic Drill String
, 2018 A new class of drill strings is investigated whereby strategically designed and placed periodic inserts are utilized to filter out the vibration transmission along the drill strings.
Sassi S., Alsaffar Y., Baz A.
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