Vibration analysis of drillstrings with self-excited stick–slip oscillations

Khulief, Y. A.; Al‐Sulaiman, Fahad A.; Bashmal, Salem

doi:10.1016/j.jsv.2006.06.065

Cited by 156 publications

(97 citation statements)

References 31 publications

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“…Some authors have proposed different models to represent the dynamics of a drill-string as, for instance, [13][14][15][16][17][18][19][20][21]. The model used in this paper takes into account the drive force at the top (as a constant rotational speed), the support force at the top (known as weight-on-hook) and the bit-rock interaction.…”

Section: Introductionmentioning

confidence: 99%

Robust optimization of the rate of penetration of a drill-string using a stochastic nonlinear dynamical model

2010

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This work proposes a strategy for the robust optimization of the nonlinear dynamics of a drill-string, which is a structure that rotates and digs into the rock to search for oil. The nonparametric probabilistic approach is employed to model the uncertainties of the structure as well as the uncertainties of the bit-rock interaction model. This paper is particularly concerned with the robust optimization of the rate of penetration of the column, i.e., we aim to maximize the mathematical expectation of the mean rate of penetration, respecting the integrity of the system. The variables of the optimization problem are the rotational speed at the top and the initial reaction force at the bit; they are considered deterministic. The goal is to find the set of variables that maximizes the expected mean rate of penetration, respecting, vibration limits, stress limit and fatigue limit of the dynamical system.

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Section: Introductionmentioning

confidence: 99%

Robust optimization of the rate of penetration of a drill-string using a stochastic nonlinear dynamical model

2010

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“…The difference of average buildup between the model with f = 30 L=s, r = 1350 kg=m 3 and the system without drilling fluid is just 5.6%. However, when the flow rate increases to 60 L/s, the difference of the two models is about 11.7%, which means that the influence of the drilling fluid could not be neglected when the flow rate of the drilling fluid is larger.…”

Section: Effects Of Drilling Fluid On the Drilling Processmentioning

confidence: 90%

“…Several methods have been widely implemented to investigate the dynamic characteristics of the drillstring system, such as the finite element method (FEM), [1][2][3][4] the differential equation method, 5 and other analytical solution.…”

Section: Introductionmentioning

confidence: 99%

A multibody dynamic model of the drilling system with drilling fluid

Hong

Cheng³

et al. 2016

Advances in Mechanical Engineering

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This article is intended to present a multibody dynamic model of the drilling system, consisting of drillstring and drilling fluid. The drillstring is a complex rigid-flexible coupling system, including rigid bodies, Euler-Bernoulli beam elements, constraints and dynamic loads, and its dynamic model is established using the absolute nodal coordinate formulation. The drilling fluid, composed of internal, annulus, and under-bit fluids, is modeled as one-dimensional compressible fluid; the relative flow of the drilling fluid is modeled using the Arbitrary Lagrangian-Eulerian description; the force of the drillstring acting on the drilling fluid is introduced through the drilling fluid transport motion; meanwhile, the reaction force acting on the drillstring is taken as an external load. The contact between the drillstring and drilling fluid is simulated based on Hertz contact theory, and the rock penetration model is built based on the rock-breaking velocity equation. Based on this model, the coupled vibration of the drillstring and the effects of the drilling fluid flow rate and density on the drilling process are investigated through several examples.

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“…Some researchers have made theoretical approach into drill pipe fatigue failure [13,14] using Lagrangian and Finite Element Dynamic Analysis to explain stick-slip, torsional, and vibrational oscillation effect on fatigue.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Study of Steel API 5A, 5L and AISI 1080, 1020 in Drill-Mud Environment of Iranian Hydrocarbon Fields

Farzam

Baghery

Dezfully

2011

ISRN Materials Science

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API 5A and 5L (grades J55, H40, N80, and K55) are used in making drill pipe and well casing. In this paper after studying the rheological and chemical properties of the mud, the effective corrosion parameters were reviewed and studied. The drill pipe corrosion management, with reference to NACE PRO 502-2002 was made and showed that for 50 drilling rigs 120 million dollars is to be spent in 21 years for corrosion damage. Potentiodynamic polarization tests were made to study the drill-pipe (API 5A), well casing (API 5L), a connecting tube (AISI 1020), and drill cable (AISI 1080) corrosion behavior in different pH and mud chemistry; following these tests, the pitting potential at which wash-out of drill pipe occurs was determined.

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Vibration analysis of drillstrings with self-excited stick–slip oscillations

Cited by 156 publications

References 31 publications

Robust optimization of the rate of penetration of a drill-string using a stochastic nonlinear dynamical model

Robust optimization of the rate of penetration of a drill-string using a stochastic nonlinear dynamical model

A multibody dynamic model of the drilling system with drilling fluid

Corrosion Study of Steel API 5A, 5L and AISI 1080, 1020 in Drill-Mud Environment of Iranian Hydrocarbon Fields

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