Results 41 to 50 of about 2,421 (246)
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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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
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Small‐Scale Magnetic Peristaltic Soft Robot With Mobility and Transport Capabilities
Advanced Intelligent Systems, EarlyView.This study introduces a miniature, untethered soft magnetic microrobot with peristaltic capabilities for both locomotion and cargo transport. Eight helically magnetized elastomeric strips deform under rotating fields (10–80 mT, 1–5 Hz), enabling movement across rods and lumina at up to 4.1 body lengths min‐¹.
Mohammad Hasan Dad Ansari +4 more
wiley +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
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A Novel Mesoscopic Drill Bit Model for Deep Drilling Applications
Modelling, 2023 This paper deals with the development of a novel mesoscopic model of polycrystalline diamond compact (PDC) drill bits that can be implemented in complex drill string models for simulations to analyse the influence of rock inhomogeneities or the impact of
Mohamed Ichaoui +2 more
doaj +1 more source
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
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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
Dynamic analysis of sonic vibration drilling string with the sampling tool
Alexandria Engineering Journal, 2022 Sonic vibration sampling technology is widely used due to its high sample fidelity, low disturbance to the stratum and environmental protection. The influence of the diameter variation of sonic drill string caused by the sampling tube on the axial ...
Liya Liu +3 more
doaj +1 more source
British Educational Research Journal, EarlyView.Abstract Quality in early childhood education and care (ECEC) is a contested concept and has generally been conceptualised by inter‐related indicators such as staff qualifications, educational environment, policy or child‐to‐staff ratios. There has been a more limited emphasis on how young children might perceive and experience quality.
Nikki Fairchild, Éva Mikuska
wiley +1 more source
Study on Drill String Stick-slip Vibration Pattern Under Bit-Rock Interaction
Shiyou jixie, 2023 Stick-slip vibration leads to high-frequency shear stress on drill string and premature fatigue of drill string.Therefor,the torsional vibration model of drill string system considering bit-rock interaction was built by coupling the bit-rock interaction ...
Xing Xuesong +4 more
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