Modeling and analysis of stick-slip and bit bounce in oil well drillstrings equipped with drag bits

Kamel, Jasem M.; Yiğit, Ahmet S.

doi:10.1016/j.jsv.2014.08.001

Cited by 94 publications

(33 citation statements)

References 34 publications

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“…Buckling can intensify the bending stress and lead to fatigue over time. More importantly, buckled shapes exert larger side forces than unbuckled which increases friction losses and can lead to the lockup of the string and the potential loss of equipment and section of the well [1][2][3]. The buckling includes the static buckling and the dynamic buckling.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Ren

Wang

Zhao

et al. 2017

Shock and Vibration

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Buckling of tubulars has been the subject of many researches in the past. However, the models in previous research always followed the same assumptions: the friction and rotation effects are ignored. The assumptions are relatively far from the reality. This paper focuses on the rotational drill string in horizontal well. The differential equation of the dynamic buckling is established considering some various factors, including friction, the drill string-borehole interaction, and rotation, and the equations of the critical load of the sinusoidal buckling and the spiral buckling are derived. Furthermore, the friction curve of the drill string and the critical load of the dynamic buckling during rotation are obtained. In addition, the influence of the rotational speed on the dynamic buckling and the axis orbit of the dynamic buckling are also gained. The results show that the critical load of the sinusoidal buckling has nothing to do with the rotational speed while the amplitude and the frequency of the dynamic buckling become larger with the increase of the rotational speed, and the dynamic buckling presents a completely different state with the development of the axial load at different speed ranges.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Ren

Wang

Zhao

et al. 2017

Shock and Vibration

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“…Los parámetros de perfo ración considerados para para introducir el na simulación fueron el WOB y el TOB. Para incluir estos parámetros, se empleó el método utiliza do por Kamel y Yigit (Kamel & Yigit, 2014) Debido a la versatilidad de las curas con vencionales propuestas por Schlumberger, se calculó bajo qué parámetros de perforación la broca PDC presentaría daños por sobrecarga. Estos parámetros deberán ser evadidos durante la planeación de la perforación para no incurrir en paradas no planeadas ni en una disminu ción abrupta de la ROP.…”

Section: Ecuación 3 Esfuerzo Hldrostáticounclassified

Análisis de la influencia del fenómeno stick- slip en los esfuerzos de los cortadores de una broca PDC, mediante simulación por elementos finitos

et al. 2015

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RESUMENLos sistemas rotarios de perforación utilizan brocas PDC1 para perforar pozos profundos con el fin de ex plorar y extraer crudo a la superficie. Estos sistemas usualmente sufren fenómenos vibratorios severos que pueden producir fallas en las herramientas de perforación. De manera específica, las vibraciones torsionales en su condición más crítica, conocida como Stick-Sllp, pueden generar delaminación y/o desprendimiento de los cortadores de la broca. El presente artículo, presenta una metodología para medir los esfuerzos mecánicos presentes como con secuencia de los fenómenos vibratorios de torsión. Adicionalmente, se hace un análisis cualitativo del comportamiento de las herramientas de perforación bajo condiciones de Stick-Slip. Al final, se evidencia la sobrecarga de esfuerzos como consecuencia del fenómeno vibratorio estudiado y se presentan los va lores de parámetros aproximados para la operación de la broca sin daños considerables.Palabras clave: Broca PDC, Vibración torsional, Modelamiento con Elementos Finitos, Stick-Slip. Aceptado: 6 de noviembre de 2015 ABSTRACTRotary drilling systems use PDC cutters in bits to drill deep wells in order to explore and extract oil to the surface. These systems usually suffers severe vibra tion phenomena that can lead to failures in drilling tools. Specifically, the torsional vibrations In the most critical condition, known as Stick-Slip, can generate delamination of the bit's cutters. This article presents a methodology for measuring the mechanical stres ses present as a result of torsional vibration pheno mena. Additionally, a qualitative analysis of the be havior of drilling tools under conditions of stick-si Ip Is presented. Finally. The stress overload as a result of Stick-Slip Is evidenced and approximate values for the operating parameters for drilling without signifi cant damage in drilling tools are presented.

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“…The first drive system employs an electrical motor coupled with a mechanical transmission box to provide torque to the rotary table at the surface. The rotary table is a large disk which functions as a kinetic energy storage unit used to sustain the desired rotational speed [1]. The rotary motion supplied by the rotary table is then transmitted through drill-strings to the drill-bit.…”

Section: Introductionmentioning

confidence: 99%

“…In Sect. 2, we present a preliminary numerical study of a low-dimensional version of the lumped-parameter model (1). The dynamics of models of this type has been analyzed in the past (see, e.g., [22][23][24]); however, the numerical investigations of the stick-slip oscillations were carried out using direct numerical integration.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental studies of stick–slip oscillations in drill-strings

Liu

Chávez

et al. 2017

Nonlinear Dyn

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The cyclic nature of the stick-slip phenomenon may cause catastrophic failures in drillstrings or at the very least could lead to the wear of expensive equipment. Therefore, it is important to study the drilling parameters which can lead to stickslip, in order to develop appropriate control methods for suppression. This paper studies the stick-slip oscillations encountered in drill-strings from both numerical and experimental points of view. The numerical part is carried out based on path-following methods for nonsmooth dynamical systems, with a special focus on the multistability in drill-strings. Our analysis shows that, under a certain parameter window, the multistability can be used to steer the response of the drill-strings from a sticking equilibrium or stick-slip oscillation to an equilibrium with constant drill-bit rotation. In addition, a small-scale downhole drilling rig was implemented to conduct a parametric study of the stick-slip phenomenon. The parametric study involves the use of two flexible shafts with varying mechanical properties to observe the effects that would have on stick-slip during operation. Our experimental results demonstrate that varying some of the mechanical properties of the drill-string could in fact control the nature of stick-slip oscillations.

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Modeling and analysis of stick-slip and bit bounce in oil well drillstrings equipped with drag bits

Cited by 94 publications

References 34 publications

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Análisis de la influencia del fenómeno stick- slip en los esfuerzos de los cortadores de una broca PDC, mediante simulación por elementos finitos

Numerical and experimental studies of stick–slip oscillations in drill-strings

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