Results 61 to 70 of about 4,494 (274)

Component-Based Modeling and Simulation of Nonlinear Drill-String Dynamics [PDF]

, 2019
In this paper, we present a dynamic model for a generic drill-string. The model is developed with the intention for component-based simulation with coupling to external subsystems.
Tengesdal, Njål Kjærnes, Holden, Christian, Pedersen, Eilif, Eilif Pedersen, Njål Tengesdal, Christian Holden   +5 more
core   +1 more source

Experimental Study on Downhole Acoustic Wave Propagation Characteristics in Curved Drill String

, 2023
Aiming at the problem of the unclear sound wave attenuation in the signal transmission of the load-bearing drill string, an experimental device for the sound wave propagation characteristics in the curved drill string was set up.
Chenguang Bi, Zhichuan Guan, Jiawei Zhang, Qing Wang, Haige Wang   +4 more
core   +1 more source

Cooperative learning strategies to raise attainment in mathematics with pupils aged 11–16 years: A systematic literature review

British Educational Research Journal, EarlyView.
Abstract Cooperative learning is a widely adopted teaching method to improve academic achievement. This review synthesises existing research on the use of cooperative learning within a school setting for pupils aged 11–16 years. Such a review has not been undertaken to date and will present an evidence base for educators considering implementation ...
Patricia Hampson, Zhe. Li, Allen Thurston   +2 more
wiley   +1 more source

A Review of the Evaluation, Control, and Application Technologies for Drill String Vibrations and Shocks in Oil and Gas Well

Shock and Vibration, 2016
Drill string vibrations and shocks (V&S) can limit the optimization of drilling performance, which is a key problem for trajectory optimizing, wellbore design, increasing drill tools life, rate of penetration, and intelligent drilling.
Guangjian Dong, Ping Chen
doaj   +1 more source

Band Gap Characteristics of Nonrotating Passive Periodic Drill String

, 2018
A new class of drill strings is investigated whereby strategically designed and placed periodic inserts are utilized to filter out the vibration transmission along the drill strings.
Sassi S., Alsaffar Y., Baz A.
core   +2 more sources

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

Research on the Influence of Deep-Water Drilling Risers on Drillstring Motion Trajectory and Vibration Characteristics

Machines
The swing of the riser in deep-water drilling can significantly impact the drill string. In this study, we establish a riser model that considers the combined disturbance of periodic dynamic wind and wave loads. By coupling it with the drill string model,
Weiguo Hai, Yingming He, Qilong Xue
doaj   +1 more source

Stress Analysis on Drilling String Vibration in Gas Drilling

Energy Procedia, 2012
AbstractUsing the finite element method, attempting to solve the serious drilling tools failure in gas drilling, this paper modelled the transient response of string vibration, and worked out the distribution regularity of the transient stress at two different drilling states: gas and mud drilling.
Jianhong, Fu, Kexiong, Song, Zhi, Zhang, Dezhi, Zeng, Fei, Liu, Xin, Xie, Xin, Zheng   +6 more
openaire   +1 more source

Vibrational Analysis of a Drill String

, 2020
In drilling processes, dynamic vibrations are the leading causes of damages to drilling equipment. This damage can happen on the borehole wall, the drill string, and at the bottom hole assembly.
Allen, Matthew, Feeney, Gage
core   +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