Results 41 to 50 of about 1,054 (134)

Literature survey on torsional drillstring vibrations [PDF]

, 1997
Leine, R.I.
core   +3 more sources

Self-Attenuation of Drillstring Torsional Vibrations Using Distributed Dampers [PDF]

, 2023
During drilling operations, drillstring vibrations cause many downhole dysfunctions, resulting in underperformance, equipment failure, and possibly wellbore damage. Current drillstring vibration mitigation solutions are generally located at a single site,
Ambrus, Adrian, Cayeux, Eric
core   +1 more source

Underreamer mechanics [PDF]

, 2009
In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will ...
Barton, David, Coskun, Erhan, Hall, Cameron, Jones, Marvin, Lacey, Andrew, Lorenz, Maike, Maringer, Johannes, Please, Colin, Richardson, Giles   +8 more
core  

Asynchronous partial contact motion due to internal resonance in multiple degree-of-freedom rotordynamics [PDF]

, 2016
Sudden onset of violent chattering or whirling rotorstator contact motion in rotational machines can cause significant damage in many industrial applications.
Champneys, A. R., Friswell, M. I., Shaw, A. D.   +2 more
core   +2 more sources

Finite Element Analysis of Drillstring Lateral Vibration [PDF]

Journal of Engineering and Applied Sciences, 2011
Lateral vibration is recognized as the leading cause of drillstring and bottom hole assembly (BHA) failures, shocks and severe damages to borehole wall. This study presents a finite element model using ANSYS software to investigate the drillstring lateral vibrations in slightly deviated wells. The analysis proceeds in two stages.
Jamal Zare, Seyed Jalalodin Hashemi, Gholamreza Rashed   +2 more
openaire   +1 more source

Instability regimes and self-excited vibrations in deep drilling systems [PDF]

, 2013
peer ...
Depouhon, Alexandre, Detournay, Emmanuel
core  

The effect of well path, tortuosity and drillstring design on the transmission of axial and torsional vibrations from the bit and mitigation control strategies [PDF]

, 2018
As well designs become increasingly complicated, a complete understanding of drillstring vibrations is key to maximize drilling efficiency, to reduce drillstring dysfunction and to minimize drillstring, tool, and borehole damage.
Shor, Roman J.
core   +1 more source

Transient responses of repeated impact of a beam against a stop [PDF]

, 2007
The transient behavior of a cantilever beam, driven by periodic force and repeated impacting against a rod-like stop, is the subject of this investigation.
Qin, Y, Yin, X.C., Zhou, H
core   +1 more source

Robust Control of Drillstring Vibrations: Modeling, Estimation, and Real-Time Considerations

Applied Sciences
This paper presents a comprehensive and hybrid control framework for the real-time regulation of drillstring systems that are subject to complex nonlinear dynamics, including torsional stick–slip oscillations, coupled axial vibrations, and intricate bit ...
Dan Sui, Jingkai Chen
doaj   +1 more source

A review of torsional vibration mitigation techniques using active control and machine learning strategies

Petroleum
Drilling is one of the most challenging and expensive processes in hydrocarbon extraction and geothermal well development. Dysfunctions faced during drilling can increase the non-productive time (NPT) greatly, resulting in inflating the drilling cost and
Aditya Sharma, Khizar Abid, Saket Srivastava, Andres Felipe Baena Velasquez, Catalin Teodoriu   +4 more
doaj   +1 more source