Results 41 to 50 of about 6,935 (243)

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

Drill-string horizontal dynamics with uncertainty on the frictional force

Journal of Sound and Vibration, 2013
Abstract This paper analyzes the dynamics of a horizontal drill-string. In this dynamics, the frictional forces between the column and the borehole are relevant and uncertain. A stochastic model is proposed for the frictional coefficient: a random field with exponential autocorrelation function.
Ritto, T. G., Escalante, M. R., Sampaio, Rubens, Rosales, Marta Beatriz   +3 more
openaire   +2 more sources

EXPERIMENTAL AND NUMERICAL STUDIES OF DRILL-STRING DYNAMICS [PDF]

, 2011
A drill string is the transmission component of rotary drill-rig system used for mining petroleum and natural gas resources. The drill-string system is essentially a long slender structure whose length can be in kilometers. Additionally, the drill-string
Liao, Chien-Min
core  

Stable Protein‐Based G‐Quadruplex‐Derived Supramolecular Bioinks as Tunable ECM‐Mimetic Constructs Assembled by Combining Non‐Covalent and Covalent Strategies

Advanced Materials, EarlyView.
Harnessing the synergistic interplay of supramolecular self‐assembly, under macromolecular crowding conditions, and enzymatic‐mediated covalent crosslinking toward a stable protein‐based G‐quadruplex‐derived supramolecular bioink. This bioinspired strategy enables the biofabrication of complex and tunable ECM‐mimetic constructs, providing a platform ...
Vera Sousa, Rita Sobreiro‐Almeida, Bart W. L. van den Bersselaar, E. W. Meijer, Ghislaine Vantomme, João Borges, João F. Mano   +6 more
wiley   +1 more source

LQR Control of Axial-Torsional Bidirectional Vibration of Drill String in Oil and Gas Wells

Shiyou jixie
To effectively solve the failure problem induced by axial-torsional bidirectional vibration of drill string， with the help of the 3-DOF dynamics model of drill pipe， a simulation study was performed on the suppression of linear quadratic regulator （LQR ...
Li Xinye, Zhang Wenbo, Guo Xiaoqiang, Zhang Wenxue, Ye Chengyang   +4 more
doaj   +3 more sources

Analysis on the dynamics of flexible drillstring under different drilling parameters

Frontiers in Earth Science
During the operation of the drill string, it displays a degree of flexibility. Simultaneously, its dynamic properties, influenced by complex stress conditions, manifest nonlinearity and uncertainty.
Jifei Cao, Jifei Cao, Deyong Zou, Qilong Xue, Jin Wang, Leilei Huang, Feng Guo, Chong Wang, Jun Qu   +8 more
doaj   +1 more source

Study on wellbore temperature of riserless mud recovery system by CFD approach and numerical calculation

Petroleum, 2020
The riserless mud recovery (RMR) system abandons the riser used in conventional offshore drilling, and the drill string above the seabed is directly exposed to seawater, resulting in convective heat transfer from the drilling fluid in the drill string to
Xin Li, Jie Zhang, Xu Tang, Gezhen Mao, Peigang Wang   +4 more
doaj   +1 more source

A REVIEW DYNAMIC VIBRATION ON DRILL STRING IN DRILLING OPERATION

Sebatik, 2019
For decades, researchers have investigated the phenomenon of vibrations in drilling activities. One of the interesting things is the vibration in the drillstring. Vibration might be caused by Interfere with each other between the drilling mud and drilling string, contact forces between the drillstring and wellbore, and interfere with each other between
Hasan Basri, Afriansyah Afriansyah
openaire   +2 more sources

String/Gauge Duality and Penrose Limit [PDF]

, 2003
Berenstein, Maldacena, and Nastase have recently discovered a particular limit of AdS/CFT correspondence where string theory in a plane wave background is dual to a sector of $mathcal N =4 SYM in a double scaling limit.
Park, Jongwon
core   +1 more source

A Dual‐Bioresponsive and Programmable Microneedle Matrix as a Bioinspired Coupler for Orchestrating Diabetic Bone Regeneration

Advanced Materials, EarlyView.
This project developed a smart bandage‐like patch (a microneedle array) for repairing diabetic bone damage. It intelligently senses signals from infection and inflammation, then releases its medicines in a specific, timed sequence: first an antibacterial agent, then an anti‐inflammatory agent, and finally growth factors.
Yu Wang, Rui Chen, Yu Chen, Haowen Lu, Yuchen Qian, Zhiheng Gao, Zheming Shen, Xiaofei Zheng, Huilin Yang, Jun Zou, Yusen Qiao   +10 more
wiley   +1 more source