Results 31 to 40 of about 248,377 (289)
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
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
System for measurement and control of drill string vibration [PDF]
, 2021 The article discusses issues of ensuring effective and reliable measurement and control of drill string vibration. A system for active measurement and control of drill string vibration is presented.
Богачев, В. В. +4 more
core +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
Advanced Robotics Research, EarlyView.This review brings together 20 publications describing 11 robotic system families developed for instrument handling, sterile‐package opening, supply delivery, and operating room logistics. Perception is becoming more capable through deep learning and language‐guided control, but autonomy remains limited, evidence is largely laboratory‐based, and no ...
Eugenia Mawuenya Akpo +4 more
wiley +1 more source
Advanced Science, EarlyView.Fluorescent BODIPY‐conjugated thiosemicarbazone ligands and their Ga(III), In(III), and Fe(III) complexes, inspired by Triapine, are developed as theranostic agents. Multiphoton FLIM and confocal microscopy in cancer cells and zebrafish reveal real‐time uptake, mitochondrial localisation, and whilst spectroscopic assays indicated preserved complex ...
Megan J. Green +15 more
wiley +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
Advanced Science, EarlyView.The pre‐regenerative vascular niche (PVN) is essential for nerve repair, yet its endothelial blueprint remains unclear. We identified angiogenic ECs (AECs) as the dominant pre‐regenerative subset and found that antler blood–derived exosomes (AB‐EXO) promote repair via IMP3.
Jinsheng Huang +11 more
wiley +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