Results 41 to 50 of about 9,104 (217)

Analysis of longitudinal, torsional and bending vibrations of drill string [PDF]

, 2013
The paper considers longitudinal, torsional and bending vibrations of the drill string that occur during the bottom-hole deepening. The equations are presented that show the possibility of applying vibration velocity to evaluate the strength and ...
Hohol, V. I., Ohorodnikov, P. I., Svtlytskyi, V. M.   +2 more
core  

Random Fatigue Analysis of Drill-Strings in Frequency Domain

MATEC Web of Conferences, 2017
Predicting fatigue damage induced by vibrations is of benefit to oil and gas industry. In this paper a spectral method is developed to estimate the damage of vibration, including both deterministic and random vibration, on the fatigue life of ...
Zheng JiaHao, Yang Jianming, Yang Ping
doaj   +1 more source

Drill string dynamic characteristics simulation for the ultra-deep well drilling on the south margins of Junggar Basin

Petroleum, 2023
Improper drilling parameters may cause severe vibration of drill string which leads to reduce the rate of penetration and drilling tool premature failure accidents in the drilling process of ultra-deep well.
Yuan Li, Jianggang Shi, Minghu Nie, Chi Peng, Yingjie Wang   +4 more
doaj   +1 more source

A Bone Marrow–Mimetic Hydrogel Enables Dual‐Phase Hemostasis and Vascularized Osteogenesis for Cranial Defects

Advanced Science, EarlyView.
A biomimetic, fiber‐reinforced hydrogel (FE‐PDA@Fib/Gel‐TG) that enables dual‐phase cranial defect repair. The system provides: instant hemostasis in the early stage, and sustained co‐delivery of pro‐angiogenic and osteogenic signals for synergistic vascularized bone regeneration.
Lingbin Che, Donghong Li, Huan Zhang, Tingting Xu, Juhan Li, Xuanzhou Chen, Louis D. Zhang, Shuguang Wang, Dianwen Song, Dongyong Sha   +9 more
wiley   +1 more source

Soft Artificial Ciliary Brush with Integrated Haptic Feedback for Efficient Airway Mucus Cleaning

Advanced Intelligent Systems, EarlyView.
A fundamental mucus cleaning mechanism is reported, which utilizes both artificial cilia mechanical sweeping and suction‐based mucus cleaning. A novel haptic feedback interface for the artificial cilia provides touch feedback on tissue contact, enhancing operator control and safety.
Zhongming Lyu, Yusheng Wang, Ruijian Ge, Darren Wang, Matthew Bacchetta, Caitlin T. Demarest, Fabien Maldonado, Xiaoguang Dong   +7 more
wiley   +1 more source

Research on a Model of Nonlinear Coupled-vibration of Directional Well Drill String [PDF]

, 2015
Drill string vibrations are inevitable movement patterns during drilling process, the drill string vibrations form including longitudinal, lateral and torsional are recognized by most scholars.
BI, Xueliang, LIU, Shanshan, WANG, Yufen, YAN, Tie, YU, Xiaowen, ZHANG, Nan   +5 more
core   +2 more sources

Effect Of Drill String Rotation On The Dynamic Response Of Drilling Risers

International Journal of Applied Mechanics and Engineering, 2015
The effect of the rotation of a drill string on the response of a drilling riser has been studied. A governing equation for the flexural response that incorporates the effect of the drill string rotation is developed from first principles, and the ...
I.E. Major, A. Big-Alabo, S. Odi-Owei
doaj   +1 more source

Real‐time lithology identification while drilling based on drill cuttings image analysis with ensemble learning

Deep Underground Science and Engineering, EarlyView.
A lithology identification while drilling method was developed, integrating an automated cuttings sampling system, a smart drilling rig, and an ensemble learning model. Underground trials achieved 97.42% accuracy in real‐time identification of cuttings lithology and composition, enhancing hazard management and supporting unmanned drilling technology in
Kun Li, Ting Ren, Ningping Yao, Jon Roberts, Haitao Song, Zhongbei Li, Xueqiu He, Liang Zhao   +7 more
wiley   +1 more source

Corrections and comments on the mathematical model presented in [Hosseinzadeh Ali and Bakhtiari-Nejad Firooz. A new dynamic model of coupled axial-torsional vibration of a drill string for investigation on the length increment effect on stick-slip instability. Journal of Vibration and Acoustics-Transactions of the ASME 2017; 139(6): 061016]

Natural Gas Industry B, 2019
In this paper, analyses on the mathematical model presented in [Hosseinzadeh Ali and Bakhtiari-Nejad Firooz. A new dynamic model of coupled axial-torsional vibration of a drill string for investigation on the length increment effect on stick-slip ...
Zifeng Li
doaj   +1 more source

Gaborlet‐guided sparse filtering: A novel intelligent method for lithology identification by vibration signals while drilling

Deep Underground Science and Engineering, EarlyView.
The flowchart illustrates rock specimen testing, vibration signal acquisition, and feature extraction with Gaborlet and sparse filtering for classification. Abstract Traditional lithology identification methods mainly rely on core sampling and well‐logging data.
Jian Hao, Danqi Zhang, Zhenqi Song, Jinrui Wang, Qi Wang, Heqing Liu   +5 more
wiley   +1 more source