Results 51 to 60 of about 643,401 (321)
Study on Rotor-Bearing System Vibration of Downhole Turbine Generator under Drill-String Excitation
EnergiesDownhole turbine generators (DHTG) installed within drill-string are susceptible to internal and external excitation during the drilling process, causing significant dynamic loads on bearings, and thereby reducing the bearing’s service life.
Benchun Yao +4 more
semanticscholar +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
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
Iris-leaf core retainer for a surface drill [PDF]
, 1969 Iris-leaf core retainer insures retention of a complete sample within the drill string. Individual overlapping leaves will not rupture or tear out when they come in contact with the oncoming ...
Olivari, H.
core +1 more source
Advanced Materials, EarlyView.A pH‐responsive biomaterial interface integrates bactericidal peptides, cell‐recruiting peptides, and magnesium ions into a multifunctional system. Infection‐induced acidification triggers antimicrobial peptide release while cell‐recruiting peptides mobilize bone marrow stem cells.
Zhenyu Li +9 more
wiley +1 more source
Some aspects of operational reliability of the drill string and its components in well construction process [PDF]
, 2013 The paper considers operational efficiency of the well deepening procedure based on the probable drilling performance and the state of drill string components.
Hohol, V. I. +2 more
core
Influence of drill-string lateral collision on wellbore stability of a horizontal well
Advances in Mechanical Engineering, 2022 A finite element model of wellbore stability was proposed for a horizontal well, and drill-string friction and lateral collision in the process of rotary motion were taken into account.
Tianshou Ma +5 more
semanticscholar +1 more source
Advanced Materials Technologies, EarlyView.This critical review presents a comprehensive roadmap for the precision 3D printing of cellulose. Quantitative correlations link ink formulation and rheological properties to print fidelity and final material performance. This framework guides the development of advanced functional materials, from biomedical scaffolds to electromagnetic shielding ...
Majed Amini +3 more
wiley +1 more source
Advanced Robotics Research, EarlyView.Muscle cell‐based biohybrid robot using nanomaterials for function enhancement and neural function for biomedical applications. Biohybrid robotics, an emerging field combining biological tissues with artificial systems, has made significant progress in developing various biohybrid constructs, including muscle‐cell‐driven biorobots and microbots.
Minkyu Shin +4 more
wiley +1 more source
Space weather effects on drilling accuracy in the North Sea [PDF]
, 2005 The oil industry uses geomagnetic field information to aid directional drilling operations when drilling for oil and gas offshore. These operations involve continuous monitoring of the azimuth and inclination of the well path to ensure the target is ...
Allen, W. +6 more
core +5 more sources