Results 131 to 140 of about 4,494 (274)

Assessing the Vulnerability of an Inuit Archaeological Site in a Changing Periglacial Environment: A Novel Multimethod Geophysical Approach in Arctic Geoarchaeology

Archaeometry, Volume 68, Issue 4, Page 620-632, August 2026.
ABSTRACT With northern regions warming at twice the global rate, assessing the state of archaeological sites in these areas is critically important. In this study, we used a multimethod geophysical approach (ERT, GPR, and EMI) to characterize the current geocryological conditions of an Inuit archaeological site on South Aulatsivik Island (Labrador ...
Rachel Labrie, Dominique Todisco, Najat Bhiry, Cécile Finco, Héloïg Barbel Le Page, Armelle Couillet   +5 more
wiley   +1 more source

Early Inspection of Drill String Fatigue Damage Based on Metal Magnetic Memory Method

Shiyou jixie, 2017
Drill string fracture frequently occurred during drilling operation seriously affected the exploration and development of oil and gas resources.To address the issue,the metal magnetic memory (MMM) detection technique was applied to the drill string ...
Hu Zhibin, Fan Jianchun, Cheng Caixia, Su Xuemei, Wu Jiafeng, Liu Shujie, He Yingming   +6 more
doaj  

Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration

Vibration
This paper presents a comprehensive analysis of the influence of rotary table velocity, weight-on-bit, and viscous damping on the drill string stick–slip vibration.
Mohammad Javad Moharrami, Hodjat Shiri, Clóvis de Arruda Martins   +2 more
doaj   +1 more source

Importance of drill string assembly swivel in horizontal drilling

Acta Montanistica Slovaca, 2006
A part of the drill string – the swivel (rotational connector) – accomplishes an important task in the horizontal drilling. Its malfunctioning makes it impossible to draw in ( install) large diameter and length pipelines. The causes of the connector break-down during the horizontal drilling are investigated in the paper.
Edmund Tasak, Jan Artymiuk, Marek Capik, Stanislaw Bednarz   +3 more
openaire   +1 more source

Study on Nonlinear Dynamics Collision of Drill String and Rock Based on ANSYS/LS-DYNA

, 2011
In the process of drilling well, the kinematics of drill string is quite complicated. The drill string not only vibrates in longitudinal, transverse and torsional direction, but also random impacts and contacts well wall.
Shang Yu Yang, Xiu Juan Yang, Xiang Zhen Yan   +2 more
core   +1 more source

Neural Networks and Multivariate Analysis Based on Geochemical Data to Determine Stone Provenance From Ancient Calabrian Quarries (Southern Italy)

Archaeometry, EarlyView.
ABSTRACT This study shows an innovative approach to determine the origin of some Calabrian rocks quarried used in ancient times. Twenty‐five quarries, distributed in all the Calabrian provinces (Southern Italy), were studied and sampled. Ten samples were taken from each quarry, for a total of 250 samples.
Domenico Miriello, Stefano Columbu, Raffaella De Luca, Marco Lezzerini, Mirco Taranto, Fabrizio Antonelli   +5 more
wiley   +1 more source

Test on Bending Fatigue Damage of Full-size Drill String

Shiyou jixie, 2017
In the past, the study on the fatigue damage of drill string was mostly modeling or small-scale test, which could not accurately represent the fatigue damage of full-bore drill string.Based on the four-point bending fatigue test, taking the full-size ...
Cheng Caixia, Fan Jianchun, Hu Zhibin, Gao Weijun, Wu Jiafeng, Liu Shujie, He Yingming   +6 more
doaj  

Dynamic Characteristics of Horizontal Drilling with Flexible Drill String Based on ABAQUS Explicit Dynamics

Shiyou jixie
During the drilling of ultrashort-radius radial horizontal well with flexible drill string， the vertical shift of wellbore trajectory affects the encountering rate of target points.
Liu Xin Huang Zhongwei Wu Xiaoguang Li Gensheng Shi Huaizhong Wang Jiarui Wang Minghao, Huang Zhongwei, Wu Xiaoguang, Li Gensheng, Shi Huaizhong, Wang Jiarui, Wang Minghao   +6 more
doaj   +1 more source

Analysis on Mechanics and Reliability of Drill String during Deep Drilling

, 2011
The deep drill string is subjected to many kinds of loading under the condition of vibration and precession, such as tension, compression, bending and torsion, while the temperature and press are very high.
Shang Yu Yang, Xiu Juan Yang, Xiang Zhen Yan   +2 more
core   +1 more source

A systematic review of generative AI in education: Empirical insights from a human–AI interaction perspective

British Journal of Educational Technology, EarlyView.
Abstract With the increasing application of GenAI in education, researchers and practitioners are paying more and more attention to its effectiveness and impact in teaching and learning. This can be evidenced by the increasing number of literature reviews on this topic published in recent years.
Zhiping Liang, Kaixun Yang, Lele Sha, Dragan Gašević, Lixiang Yan, Guanliang Chen   +5 more
wiley   +1 more source