Results 1 to 10 of about 1,199 (85)
Spectral Analysis of the Infinite-Dimensional Sonic Drillstring Dynamics
Mathematics, 2023 By deploying sonic drilling for soil structure fracturing in the presence of consolidated/ unconsolidated formations, this technique greatly reduces the friction on the drillstring and bit by using energetic resonance, a bit-bouncing high-frequency axial
Kaïs Ammari, Lotfi Beji
doaj +3 more sources
Effects of axial impact load on the dynamics of an oilwell drillstring
Advances in Mechanical Engineering, 2019 This article studies the dynamics of oilwell drillstring under large and small axial impact loads. For the case of large impact load, the drillstring is regarded as a continuous bar under the impact load of a falling mass, and the energy conservation ...
Liping Tang, Xiaohua Zhu, Hongzhi Lin
doaj +2 more sources
Advances in Mechanical Engineering, 2015 This article models the contact between the drillstring with large slenderness ratio and the extending rigid wellbore based on the multibody dynamics method. The drillstring is modeled as absolute nodal coordinate formulation beams with contact detection
Ningyu Wang +6 more
doaj +2 more sources
Analysis on the dynamics of flexible drillstring under different drilling parameters
Frontiers in Earth ScienceDuring the operation of the drill string, it displays a degree of flexibility. Simultaneously, its dynamic properties, influenced by complex stress conditions, manifest nonlinearity and uncertainty.
Jifei Cao +8 more
doaj +3 more sources
Nonlinear rotordynamics of a drillstring in curved wells: Models and numerical techniques [PDF]
International Journal of Mechanical Sciences, 2020 International audienceThe drilling operations for oil or geothermic extraction use a slender structure introduced inside the drill well, hanging from a derrick and driven by a rotary table at the surface.
Marie-Ange Andrianoely +2 more
exaly +5 more sources
Shock and Vibration, 2021 High-frequency measurements can provide much more new insights for drillstring dynamics compared to traditional instruments, leading to a new realm of understanding of drillstring behaviors in great detail than before.
Lixin Li +6 more
doaj +1 more source
Analysis on the lateral vibration of drill string by mass effect of drilling fluid [PDF]
Mechanical Sciences, 2019 It is well known that the influence of the internal and external drilling fluid on the lateral vibration characteristics of drillstring cannot be ignored. In this paper, experiment apparatus for simulating drillstring vibration was established. Hammering
C. Yang +4 more
doaj +1 more source
Comparing Advanced Control Strategies to Eliminate Stick-Slip Oscillations in Drillstrings
IEEE Access, 2022 In this paper, we present three methods to achieve reliable drillbit angular velocity control for deep drilling operations. We consider a multi-sectional drilling system with the bit off-bottom, which represents the system at the start-up of a drilling ...
Jean Auriol +4 more
doaj +1 more source
Use of the energy of parametric oscillations to improve drilling indices [PDF]
, 2011 Purpose. Increase of the efficiency of using energy of parametric oscillations within the assembly of drilling string bottom by means of solving nonlinear-parametric equations of a “bit – drive motor – drilled-out rock” system to improve drilling indices.
Bakenov +11 more
core +2 more sources
Mechanical Analysis of DS in Horizontal Directional Drilling
Applied Sciences, 2022 In recent years, trenchless horizontal directional drilling (HDD) technology has developed rapidly towards the direction of large pipe diameter and long span. During construction, the buckling deformation and large drag torque of the drillstring (DS) are
Hua Tong, Yongbo Shao
doaj +1 more source