Results 31 to 40 of about 4,494 (274)
Drill-String Dynamics: Reduced-Order Models
, 2009 Research efforts are underway to model and study the dynamics of a drill string, and preliminary results are presented in this work. The dynamics of a drill string system has non-smooth characteristics. Moreover, the drill string system dynamics exhibits
Balakumar Balachandran +2 more
core +1 more source
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
Drill string rotary speed influence on equivalent circulating density value
, 2018 Presented article displays a debate about very complex and still not fully understood issue of drill string rotary speed (DSRS) impact on pressure losses in wellbore annulus, thus Equivalent Circulating Density (ECD) value.
Kiebzak, P. +5 more
core +1 more source
Sensing and computational frameworks for improving drill-string dynamics estimation [PDF]
, 2021 International audienceIn this paper, we consider the axial motion of a directional multi-sectional drill-string. The drillstring dynamics are represented by a distributed dynamical model (wave equations) coupled with an ordinary differential equation at ...
Auriol, Jean +2 more
core +1 more source
Review of Thermally Activated Twisted Coiled Polymer Actuators: A Materials Science Perspective
Advanced Functional Materials, EarlyView.Thermally activated twisted and coiled polymer actuators (TCPAs) combine lightweight design, large deformation, and scalable fabrication for soft robotic and wearable applications. This review connects polymer structure, processing history, helix geometry, and thermomechanical characterization to actuator performance, highlighting current challenges in
Nadja Schenk +3 more
wiley +1 more source
Analysis on Casing Wear Induced by Drill String Whirling during Workover Drill Grinding
Shiyou jixie, 2021 When the drill string rotates in the wellbore, it will whirl, collide with and rub against casing inwall, resulting in casing wear and reducing wellbore safety.
Cao Yinping +3 more
doaj
Advanced Healthcare Materials, EarlyView.The repair and regeneration of brain tissue faces both biological and technical challenges. Injectable bioscaffolds offer new opportunities to stimulate tissue regrowth in the brain by recruiting neural stem cells. Here, the translational issues are reviewed that need to be address to advance this promising new therapeutic approach from the bench to ...
Michel Modo, Alena Kisel
wiley +1 more source
Fatigue Analysis of the Drill String According to Multiaxial Stress
, 2011 To find out the cause for fatigue failure of a drill string used in oil field drilling, and considering the actual working conditions, axial, radial and circumferential cyclic stresses borne by the drill string in borehole of oil and gas well, fatigue ...
Xiang Hong Lv, Jian Bing Zhang
core +1 more source
Advanced Healthcare Materials, EarlyView.We develop a covalent organic framework‐loaded Traditional Chinese Medicine monomer nanodrug delivery system (ISL@bCOF) via boron‐oxygen bonds, a smart response to glucose for delivering AI‐driven isoliquiritigenin (ISL) targeting ZBP1. This dynamic release mechanism, combined with transdermal delivery technology via potent microneedles, can modulate ...
Menghan Zhou +9 more
wiley +1 more source
Advanced Materials, EarlyView.Metal‐free carbon catalysts enable the sustainable synthesis of hydrogen peroxide via two‐electron oxygen reduction; however, active site complexity continues to hinder reliable interpretation. This review critiques correlation‐based approaches and highlights the importance of orthogonal experimental designs, standardized catalyst passports ...
Dayu Zhu +3 more
wiley +1 more source