Results 21 to 30 of about 6,935 (243)
Prediction-Based Control for Mitigation of Axial-Torsional Vibrations in a Distributed Drill-String System [PDF]
, 2022 This article proposes a control strategy to stabilize the axial-torsional dynamics of a distributed drill-string system. An infinite-dimensional model for the vibrational dynamics of the drill string is used as a basis for controller design.
Vossoughi, Gholamreza +3 more
core +1 more source
Energy Reports, 2023 Large amplitude and high frequency WOB (weight on bit) fluctuation will lead to problems such as low rock breaking efficiency, short service life and slow drilling speed. This problem is particularly prominent in hard and difficult to drill formation and
Liu Yongwang +5 more
doaj +1 more source
Effect of vibration dampers on the dynamic state of a drill string
Technology audit and production reserves, 2023 The object of research is the drill string bottom structure using the correcting devices of drilling modes to control the dynamics of the drill string. The work is aimed at the study of longitudinal, torsional and transverse oscillations when adjusting the axial load on the bit by using a drilling shock absorber with a two-link characteristic.
Viktor Svitlytskyi +2 more
openaire +3 more sources
On resonance regimes of drill string nonlinear dynamics [PDF]
AIP Conference Proceedings, 2017 The paper focuses on investigation of resonance regimes of a drill string nonlinear dynamics under the effect of a variable axial compressive force. The drill string is modelled in the form of a rotating elastic isotropic rod with hinged ends. Deformations of the drill string are assumed to be finite.
Askat Kudaibergenov +2 more
openaire +1 more source
Non-Linear Dynamic Analysis of Drill String System with Fluid-Structure Interaction
Applied Sciences, 2021 In this research, the non-linear dynamics of the drill string system model, considering the influence of fluid—structure coupling and the effect of support stiffness, are investigated. Using Galerkin’s method, the equation of motion is discretized into a
Rongpeng Wang +3 more
doaj +1 more source
Applied Sciences, 2021 In downhole drilling systems, self-excited torsional vibrations caused by the bit-rock interactions can affect the drilling process and lead to the premature failure of components.
Vincent Kulke +3 more
doaj +1 more source
Non-smooth dynamics modeling of drill-string systems in heterogeneous formations [PDF]
, 2022 An extension of the drill-string dynamics model for drilling in heterogeneous rock formations is presented to study the heterogeneity effect on both the axial and torsional ...
Aribowo, Arviandy; id_orcid +3 more
core +2 more sources
Modelling of drill string nonlinear dynamics with a drilling fluid flow
Вестник КазНУ. Серия математика, механика, информатика, 2018 In this work the development of mathematical models of drill string dynamics under the influence of internal drilling fluid flow, which is of great importance for ensuring fast, cost-effective and safe process of oil and gas well drilling, is conducted.
Askar K. Kudaibergenov, L. A. Khajiyeva
doaj +1 more source
Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String
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
doaj +1 more source
Component-Based Modeling and Simulation of Nonlinear Drill-String Dynamics [PDF]
, 2019 In this paper, we present a dynamic model for a generic drill-string. The model is developed with the intention for component-based simulation with coupling to external subsystems.
Tengesdal, Njål Kjærnes +5 more
core +1 more source