Results 61 to 70 of about 248,377 (289)

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

Late Holocene Occupation and Resource Use in the Sub‐Coastal Moreton Region: The Open‐Air Howard Creek Site, Southeast Queensland

Archaeology in Oceania, EarlyView.
ABSTRACT This paper reports archaeological investigations at the Howard Creek site, a Late Holocene open‐air site in the sub‐coastal Moreton region of southeast Queensland. The site adds to a regional record based largely on rockshelter excavations. Development‐led salvage investigations included excavation, radiocarbon dating, lithic analysis, and use‐
Irina A. Ponomareva, Cate Cunningham, Birgitta Stephenson   +2 more
wiley   +1 more source

Significant Geographic Variation in the Epidemiology and Management of Pediatric Osteochondritis Dissecans Exists Between the Asia‐Pacific and North America

Arthroscopy, Sports Medicine, and Rehabilitation, EarlyView.
Purpose To evaluate regional variations in epidemiology, diagnostic approaches, and surgical interventions for pediatric osteochondritis dissecans (OCD) between Asia‐Pacific (APAC) and North America (NA). Methods A comprehensive search of PubMed, Scopus, and Cochrane Library databases was conducted from database inception until August 2025.
Joshua Rui Yen Wong, Yun Xiu Lam, Si Heng Sharon Tan, James Hoi Po Hui, Ming Wang   +4 more
wiley   +1 more source

Natural Frequency Analysis of a Stepped Drill String in Vertical Oil Wells Subjected to Coupled Axial–Torsional–Lateral Vibrations

Energies
Drilling oil and gas wells is a complex process that requires a combination of several parameters to dig into the ground. Inappropriate drilling parameter settings and reaction forces can lead to unwanted vibrations, which can negatively impact the drill
Mohamed Zinelabidine Doghmane
doaj   +1 more source

The Use of Aluminum Drill Pipe for Damping Drill String Vibrations

, 2018
Drill string vibrations are a significant concern during drilling operations, and are a common cause of downhole tool failures and decreases in drilling efficiency.
Evgeny G. Podnos, Mostafa Al Furati, Christian F. Brown, Arild Saasen, Mitchell Dziekonski   +4 more
core   +1 more source

Research on BHA Load Transfer Considering Drill String Transverse Vibration [PDF]

, 2013
With increasing difficulty of reservoir development and harsh geological conditions, higher drilling technology meets lots of challenges, especially in the large displacement wells and ultra-deep wells.
Peng, WANG, Tie, YAN, Qian, Zhang
core   +1 more source

Double‐Bundle Anterior Cruciate Ligament Reconstruction Provides Superior Short‐to‐Midterm Rotational Stability But Not Clinically Important Functional Gains Over Single‐Bundle: A Systematic Review and Meta‐analysis

Arthroscopy, Sports Medicine, and Rehabilitation, EarlyView.
Purpose To compare the biomechanical and functional outcomes between single‐bundle and double‐bundle (DB) anterior cruciate ligament reconstruction techniques using the most current evidence, stratified by follow‐up duration. Methods PubMed, Embase, and Cochrane databases were searched from 2013 to September 2025 for randomized controlled trials ...
Manuel Alberto Gutierrez‐Moreno, Luis Eduardo Arámbula‐Torres, Ramon Alonso Prieto‐Baeza, Carlos Leal‐Contreras, Cristina Alejandra Fuentes‐Flores, Edmundo Berumen‐Nafarrate   +5 more
wiley   +1 more source

Drill string enclosure

, 1992
This invention is comprised of a drill string enclosure which consists of six component parts, including; a top bracket, an upper acrylic cylinder, an acrylic drill casing guide, a lower acrylic cylinder, a bottom bracket, and three flexible ducts.
Wiersholm, O., Miller, T. A., Kuhns, D. J., Jorgensen, D. K.   +3 more
core  

Drill-String Dynamics: Reduced-Order Models

, 2009
Research efforts are underway to model and study the dynamics of a drill string, and preliminary results are presented in this work. The dynamics of a drill string system has non-smooth characteristics. Moreover, the drill string system dynamics exhibits
Balakumar Balachandran, Chien-Min Liao, Mansour Karkoub   +2 more
core   +1 more source

Report on ignitability testing of flammable gasses in a core sampling drill string [PDF]

, 1996
This document describes the results from testing performed at the Pittsburgh Research Center to determine the effects of an ignition of flammable gasses contained in a core sampling drill string.
Witwer, K. S.
core   +1 more source