Results 51 to 60 of about 9,104 (217)
Incipient Regimes of Drill Bit Whirlings on Uneven Bottoms of Deep Bore-Holes [PDF]
, 2016 This paper studies the problem of whirl vibrations of rotating drill string bit under conditions of its contact interaction with the bore-hole bottom surface.
Glazunov, Sergiy M. +2 more
core +1 more source
Research on Vibration Reduction and ROP Acceleration for Drilling in KOA Oilfield,Kazakhstan
Shiyou jixie, 2023 The KOA oilfield is located in the eastern margin of the Caspian Basin,Kazakhstan.The shallower Upper Permian of the oilfield is found with severe interbeding between sandstone and mudstone as well as interlayers of mudstone/slate and conglomerate.The ...
Wang Jianning +4 more
doaj
FlexMat, EarlyView.Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu +3 more
wiley +1 more source
, 2009 In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will ...
Barton, David +8 more
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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
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Analysis of Drill String Whirling Characteristics Based on Near-Bit Measurement Data
Shiyou jixieThe displacement signal of drill string vibration is difficult to be obtained in the actual drilling process. To further understand the vibration characteristics of drill string when whirling motion occurs in wellbore during drilling process， first， the ...
Zhang Tao +5 more
doaj +1 more source
Drill string nonlinear vibrations: experimental studies and finite-element analysis
Journal of Physics: Conference Series, 2018 In the present work, nonlinear vibrations of drill strings are studied. A laboratory scale arrangement consisting of a flexible rod with rotor-stator system is used to study the system dynamics. A finite-element model has been developed to study the system dynamics.
Kanzari M. +3 more
openaire +2 more sources
Actuation Strategies for Underwater Jet‐Propelled Soft Robots
Journal of Field Robotics, EarlyView.ABSTRACT This review article examines jet‐propulsion mechanisms in underwater soft robotic systems, focusing exclusively on physically fabricated and experimentally validated robots. Covering research published from 2013 to 2025, this study classifies and evaluates jet‐propulsion robots based on their actuation mechanisms.
Angel Kitone +3 more
wiley +1 more source
Влияние утяжеленных бурильных труб на спектр продольных колебаний бурильного инструмента [PDF]
, 2014 При бурінні свердловин у процесі експлуатації породоруйнівний інструмент і бурильна колона руйнуються внаслідок пружних вібрацій, а також статичних й зовнішніх навантажень.
Levchuk, K. G. +2 more
core
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
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