Results 11 to 20 of about 9,449 (231)
The impact of multidirectional excitation on the stick–slip vibration characteristics of a drill string [PDF]
Scientific ReportsStick–slip vibration is a common phenomenon in ultra-deep drilling that significantly impacts the failure of both drill bits and drill tools. The most direct and efficacious approach to alleviating the stick–slip vibration of the drill string in the ...
Zhao Hongshan, Wang Wenchang, An Kaixian
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Longitudinal Vibrations of a Drill String [PDF]
The Journal of the Acoustical Society of America, 1965 When 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
F. A. Angona
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Identifying the Optimum Zone for Reducing Drill String Vibrations [PDF]
SPE Annual Technical Conference and Exhibition, 2017 Abstract Drilling operators witness significant lost time due to early failure of bottomhole equipment resulting from vibration and shock. This eventually leads to cumulative losses of millions of dollars for the industry. Increase in applied weight on bit (WOB) at low angular velocity (RPM) can trigger instabilities leading to stick ...
Etaje Darlington Christian
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Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String [PDF]
Shock and Vibration, 2016 A nonlinear dynamics model and qualitative analysis are presented to study the key effective factors for coupled axial/torsional vibrations of a drill string, which is described as a simplified, equivalent, flexible shell under axial rotation.
Fushen Ren +4 more
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Numerical Investigation of the Influence of the Drill String Vibration Cyclic Loads on the Development of the Wellbore Natural Fracture [PDF]
Energies, 2021 Wellbore instability is one of the most serious issues faced in the drilling process. During drilling operations, the cyclic loads applied on the fractured formation progressively modify the initial parameters (i.e., length and width) of the fractured ...
Arnaud Regis Kamgue Lenwoue +7 more
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Study on Drill String Stick-slip Vibration Pattern Under Bit-Rock Interaction
Shiyou jixie, 2023 Stick-slip vibration leads to high-frequency shear stress on drill string and premature fatigue of drill string.Therefor,the torsional vibration model of drill string system considering bit-rock interaction was built by coupling the bit-rock interaction ...
Xing Xuesong +4 more
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Shiyou jixie, 2021 The stick-slip vibration of the horizontal well drill string system seriously threatens the safety of downhole drill strings and tools, reduces the drilling efficiency of the horizontal section, making the drill bit fail prematurely.
Zhu Jieran +5 more
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Stress Analysis on Drilling String Vibration in Gas Drilling
Energy Procedia, 2012 AbstractUsing the finite element method, attempting to solve the serious drilling tools failure in gas drilling, this paper modelled the transient response of string vibration, and worked out the distribution regularity of the transient stress at two different drilling states: gas and mud drilling.
Jianhong, Fu +6 more
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Suppression of Stick-Slip Vibration of Drill String by Fractional-Order PID Control
Shiyou jixie, 2020 Stick-slip vibration of drill string is one of the important reasons leading to accelerated wear and premature damage of drilling equipment, reduced drilling safety and reduced drilling efficiency.
Zhang Qizhi, Xu Shuai
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Drill string Vibration Modeling Including Coupling Effects
International Journal of Industrial Engineering and Production Research, 2007 Abstract: The governing equations of motion for a drill string considering coupling between axial, lateral and torsional vibrations are obtained using a Lagrangian approach. The result leads to a set of non-linear equations with time varying coefficients.
H. Ahmadian, S. Nazari, H. Jalali
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