Results 31 to 40 of about 242,341 (155)
Modeling and Analysis of Drill String–Casing Collision under the Influence of Inviscid Fluid Forces
Applied Sciences, 2023 The current study aims to study the drill string–casing system operating in an inviscid fluid under imbalanced and rubbing damage types. The Navier–Stokes equations were linearized to establish the hydrodynamic forces surrounding the drill string and ...
Bernard Xavier Tchomeni Kouejou +2 more
doaj +1 more source
Nonlinear Static Analysis of Riserless Sampling Drill String in Ultra-deepwater of South China Sea
Shiyou jixie, 2017 With the load effects of current, wave, soil, drifting of drill ship during the sampling drilling process, the rope type drill string has very complex static characteristics featuring geometric nonlinearity and contact nonlinearity.
Gao Guanghai +4 more
doaj
Minimizing Drill-String-Induced Wellbore Instability
, 2023 Objective/Scope: Every year the petroleum industry spends more than an estimated $6 billion in mitigating wellbore instabilities that account for nearly half of the drilling-related NPT (non-productive time).
DAS, SOUKAT KUMAR +3 more
core +1 more source
Analysis of Transverse Vibration of the Drill String in Vertical Section of Horizontal Well
Shiyou jixie, 2017 For the drill string fatigue failure caused by drill string resonance, taking the drill string in the vertical section of a horizontal well in the southwest of China as study object, the inner and outer pressure of the drill string as the function of ...
Cao Yu +5 more
doaj
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
doaj
Mechanical Modelling of Drill‐Strings [PDF]
PAMM, 2003 AbstractVibrations in long torsional strings result in spatio‐temporal dynamics. These vibrations disturb the accuracy of the drilling process and may cause damage due to fatigue. The high costs of drillings are the main motivation for the suppression of vibrations of the drill–string. In this paper a model for the drill string is proposed. In order to
E. Kreuzer, H. Struck
openaire +1 more source
Simulation of the Drill String Vibration Signal System
Shiyou jixie, 2015 To understand the signal transmission processes and rules as well as the structure and components of signals inside the drill string,through establishing signal transmission model,a drill string vibration simulation software has been developed based on ...
宋一晨, 吕苗荣, 陆健
doaj
Development of Similarity Theory-based Horizontal Well Drill String Test Apparatus
Shiyou jixie, 2016 In order to conduct research on dynamic properties of drill string in the horizontal well,a horizontal well drill string test apparatus is developed based on parameter correspondence between test model and site prototype.The parameter correspondence is ...
Ren Fushen +3 more
doaj
Research on a Model of Nonlinear Coupled-vibration of Directional Well Drill String [PDF]
, 2015 Drill string vibrations are inevitable movement patterns during drilling process, the drill string vibrations form including longitudinal, lateral and torsional are recognized by most scholars.
YAN, Tie +5 more
core +1 more source
Geomechanics and Geophysics for Geo-Energy and Geo-ResourcesIn underground coal mine rotary drilling, rock-breaking energy is transmitted from the drill string to the drill bit. Nonlinear vibrations of the drill string within the borehole result in kinetic energy dissipation.
Shuhan Shi +7 more
doaj +1 more source