Results 11 to 20 of about 235,356 (289)
Optimal design and nonlinear dynamic characteristics of titanium /steel drill pipe composite drill string for ultra-deep drilling [PDF]
Scientific Reports, 2023 Titanium drill pipe have promising application prospects in ultra-deep drilling, but the nonlinear dynamic characteristics of composite drill strings are very complex.
Qiang Liu +9 more
doaj +2 more sources
Effect Of Drill String Rotation On The Dynamic Response Of Drilling Risers [PDF]
International Journal of Applied Mechanics and Engineering, 2015 The effect of the rotation of a drill string on the response of a drilling riser has been studied. A governing equation for the flexural response that incorporates the effect of the drill string rotation is developed from first principles, and the ...
I.E. Major, A. Big-Alabo, S. Odi-Owei
doaj +2 more sources
On “Lump mass torsional vibration model” and helical deformation of drill string
Petroleum, 2021 This paper analyses the physical models in “Kapitaniak M, Hamaneh VV, Chávez JP, Nandakumar K, Wiercigroch M. Unveiling complexity of drill–string vibrations: experiments and modelling. International Journal of Mechanical Sciences 2015; 101–102: 324–327”.
Zifeng Li
doaj +1 more source
Arthroscopic Dynamic Anterior Stabilization and Augmentation of Bony Bankart Lesions With Transfer of the Long Head of the Biceps. [PDF]
Arthrosc TechAbstract Bony Bankart fractures treated arthroscopically with conventional suture anchor fixation are often complicated by fragment displacement and nonunion because of inadequate reduction. This technical report introduces a novel technique using the long head of the biceps (LHB) tendon transfer for elevating bony fragment and augmenting suture anchor
Su W, Wei X, Zhao J, Xie G.
europepmc +2 more sources
Research of the pulsating flow of drilling fluid in the drill string
Technology audit and production reserves, 2022 The object of research is the pulsating flow of drilling fluid in the drill string. One of the most problematic places is pressure loss due to friction forces distributed along the length of the flow and concentrated in its nodes (threaded joints and pipe bends).
Viktor Svitlytskyi, Irina Boshkova
openaire +2 more sources
Vibration of Periodic Drill-Strings with Local Sources of Resonance
Vibration, 2021 A new class of drill-strings is proposed for attenuating undesirable vibrations to ensure effective operation. The drill-string is provided with passive periodic inserts, which are integrated with sources of local resonance (LR).
Wael Akl +3 more
doaj +1 more source
Study on dynamic characteristics of drill string in deep-water riserless drilling
Advances in Mechanical Engineering, 2023 The cost and security of ocean drilling are directly related to the efficient exploration and development of ocean resources. The riserless drilling system is usually adopted in the ocean drilling.
Fangfei Huang +4 more
doaj +1 more source
An impedance approach to reduce the contact-instability whilst drilling with active heave compensation [PDF]
, 2012 The bit-bounce, or contact-instability, phenomenon which occurs in the drill string suspended from a floating vessel with an active drill string compensator to maintain a steady weight on the drill bit is investigated.
Hatleskog, Jan, Dunnigan, Mathew Walter
core +1 more source
Energies, 2021 The longitudinal vibration of the drill pipe contains considerable energy which can be used to improve the rock-breaking efficiency during drilling. It is very important to the development of drilling speed-up tools to have a comprehensive understanding ...
Yuqiang Xu +2 more
doaj +1 more source
Energy Reports, 2023 Large amplitude and high frequency WOB (weight on bit) fluctuation will lead to problems such as low rock breaking efficiency, short service life and slow drilling speed. This problem is particularly prominent in hard and difficult to drill formation and
Liu Yongwang +5 more
doaj +1 more source