Results 181 to 190 of about 801 (206)

Guidelines for Controlling Drill String Vibrations

Journal of Energy Resources Technology, 1984
Bottom-hole assemblies control the vibration response of drill strings because they are much heavier and stiffer than drill pipe. The length of bottom-hole assemblies is also a factor and the present practice of determining drill collar length often leads to natural tuning with drill bit displacement frequencies. As a result, bottom-hole assemblies are
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Nonlinear Modeling and Qualitative Analysis of Coupled Vibrations in a Drill String

International Journal of Bifurcation and Chaos, 2018
A coupled model for axial/torsional/lateral vibrations of the drill string is presented, in which the nonlinear dynamics and qualitative analysis method are employed to find out the key factors and sensitive zone for coupled vibration. The drill string is simplified as an equivalent shell under axial rotation.
Fushen Ren, Baojin Wang, Suli Chen
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Longitudinal and Angular Drill-String Vibrations With Damping

Journal of Engineering for Industry, 1968
This paper discusses longitudinal and angular drill-string vibrations and supporting field measurements taken with a special downhole recording instrument. Computer programs based on the theory are used to calculate longitudinal and angular vibrations (caused by periodic bit motions) along the drill string; field measurements made during actual ...
D. W. Dareing, B. J. Livesay
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Drill String Vibration Mitigation During Simultaneous Drilling and Hole Enlargement

SPE/IADC Drilling Conference and Exhibition, 2009
Abstract Drill string vibrations (torsional, axial, and lateral uncontrolled movements) can create issues with equipment, drilling performance and wellbore quality. With respect to equipment, prolonged excessive drill string vibration exposure can lead to fatigue failure such as drill string ‘twist off’, downhole tool breakage, shorter ...
Stefano Mancini, Graham Hitchcock, Jørn Opsahl, Luk Servaes   +3 more
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The Effects of Drilling Mud and Weight Bit on Stability and Vibration of a Drill String

Journal of Vibration and Acoustics, 2011
The main goal of this research is to analyze the effects of drilling mud flow rate, drill string weight, weight on bit and angular velocity on stability and vibration of a drill string. To this end, kinetic and potential energies of a rotating drill string are written while axial and lateral vibrations are considered.
Ali Asghar Jafari, Reza Kazemi, Mohammad Faraji Mahyari   +2 more
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System and method for damping vibration in a drill string

The Journal of the Acoustical Society of America, 2008
A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid.
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Analysis of the Influences of Drilling Fluid Flow Velocity inside and outside the Drilling String on Drilling String Lateral Vibration Frequency

Advanced Materials Research, 2013
Drilling string lateral vibration is a severe damage,which is influenced by many complex factors. This paper makes a theoretical analysis of the drilling string lateral vibration frequency caused by drilling fluid flow velocity inside and outside the drilling string, which supplies some evidence for calculating rotation speed of rotary table and ...
Tie Yan, Li Wang, Xiao Feng Sun, Jun Bo Qu   +3 more
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Analysis of the Influences of Drilling Fluid Flow Velocity inside and outside the Drilling String on Drilling String Lateral Vibration Frequency

Advanced Materials Research, 2014
Drilling string lateral vibration is a severe damage,which is influenced by many complex factors. This paper makes a theoretical analysis of the drilling string lateral vibration frequency caused by drilling fluid flow velocity inside and outside the drilling string, which supplies some evidence for calculating rotation speed of rotary table and ...
De Da Hou, Qing Bin Zhang, Yun Hua Cui, Cheng Dong Zhang   +3 more
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On the formation of the drill string resonance vibrations

Construction of Oil and Gas Wells on Land and Sea, 2022
V.K. Khegai, K.V. Khegai
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Study on Vibration Energy Conversion Efficiency of the Drill String Absorption & Hydraulic Supercharging Device

Chemistry and Technology of Fuels and Oils, 2022
Hongning Zhang, Baoping Lu
exaly