Results 171 to 180 of about 9,104 (217)
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Longitudinal natural vibration of ultra-long drill string during offshore drilling
Ocean Engineering, 2018Abstract Offshore drilling with ultra-long drill strings (i.e., longer than 10,000 m) creates a new class of technical challenges, such as dynamic variation of weight on bit (WOB). This article investigates observational data obtained from a drilling program conducted by the scientific drilling vessel Chikyu using an 8000 m drill string, which is ...
Ryota Wada +4 more
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Nonlinear Stochastic Drill-String Vibrations
Journal of Vibration and Acoustics, 2002Lateral vibrations of drill-strings used in oil well operations are considered. A finite elements based discretization procedure leads to a nonlinear dynamic system which is used to represent the drill-string inertia and stiffness characteristics, as well as the elasticity of the wall of the well.
P. D. Spanos +2 more
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Stick-Slip Vibration of Drill Strings
Journal of Engineering for Industry, 1991The stick-slip vibration is introduced as a new mechanism to explain the large amplitude torsional oscillation of the drill strings in oil and gas well drillings. A record of field data is identified and simulated according to the new mechanism. The analytical results derived from the numerical simulation agree with the field data with 95.6 percent ...
Yu-Hwa Wang, Yao-Qun Lin
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An Experimental Study of Drill-String Vibration
Journal of Engineering for Industry, 1960This paper describes equipment which has been developed for the measurement of axial force, torque, and axial and rotational motions at the top of a drill string. Measurements made in two wells with this equipment represent the first time these quantities have been recorded during drilling.
I. Finnie, J. J. Bailey
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Drill String Vibration Mitigation During Simultaneous Drilling and Hole Enlargement
SPE/IADC Drilling Conference and Exhibition, 2009Abstract 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 +3 more
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An Analytical Study of Drill-String Vibration
Journal of Engineering for Industry, 1960Longitudinal and torsional vibrations in a drill string consisting of drill pipe and collars, and the boundary conditions at the ends of the string, are discussed. A trial-and-error method of solution for the natural frequencies is demonstrated. Since it is very lengthy, certain useful charts are then derived, and a graphical method of solution for the
J. J. Bailey, I. Finnie
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Research and Analysis of Drilling String Vibration Signals
2020 IEEE International Conference on Mechatronics and Automation (ICMA), 2020Drilling tools are the main components of the drilling system, including drill bits and drill rods. During the drilling process, due to the collision between the drill bit and different formations, the drill string often vibrates, which causes damage to the drill bit and has a serious negative impact on drilling.
Bilin Li, Yi Gao, Ruibing Li
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Guidelines for Controlling Drill String Vibrations
Journal of Energy Resources Technology, 1984Bottom-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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Longitudinal Vibrations of a Drill String
The Journal of the Acoustical Society of America, 1965When drilling an oil well with a rotary drill, the penetration rate often can be substantially increased by superimposing a vibratory motion on the rotating bit. In order to evaluate drilling methods that would include both rotary and vibratory action, a study has been made on the vibrational characteristics of long drill string. The resonant frequency
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The Use of Aluminum Drill Pipe for Damping Drill String Vibrations
SPE Norway One Day Seminar, 2018Abstract Drill string vibrations are a significant concern during drilling operations, and are a common cause of downhole tool failures and decreases in drilling efficiency. Drill string vibrations are typically categorized in three ways: axial (the drill string is vibrating along the axis of drilling), lateral (the drill string is ...
Christian F. Brown +4 more
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