Results 151 to 160 of about 643,401 (321)

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

The effectiveness of implementation intentions in children: A systematic review and meta‐analysis

British Journal of Psychology, EarlyView.
Abstract Self‐regulation abilities in childhood are important for long‐term academic achievement and healthy development. As self‐regulatory abilities are still developing, ‘simple’ interventions are needed to foster self‐regulation. Implementation intentions are simple plans that could promote goal achievement in children.
Jasmin Breitwieser, Tilman Reinelt
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

Аналіз вібраційної міцності бурильної колони з використанням теорії випадкових коливань [PDF]

, 2013
У статті викладено основні результати науково-дослідної роботи, пов’язаної з розробкою теоретичних і експериментальних методів оцінки рівня вібраційної міцності елементів бурильної колони із застосуванням теорії ймовірності.
Гоголь, В. І., Огородніков, П. І., Світлицький, В. М.   +2 more
core  

Investigating dynamics in attentive and inattentive responding together with their contextual correlates using a novel mixture IRT model for intensive longitudinal data

British Journal of Mathematical and Statistical Psychology, EarlyView.
Abstract In ecological momentary assessment (EMA), respondents answer brief questionnaires about their current behaviours or experiences several times per day across multiple days. The frequent measurement enables a thorough grasp of the dynamics inherent in psychological constructs, but it also increases respondent burden.
Leonie V. D. E. Vogelsmeier, Irina Uglanova, Manuel T. Rein, Esther Ulitzsch   +3 more
wiley   +1 more source

Stratigraphic evidence for modern‐like glacier extents in south‐central Alaska within the last glacial period (MIS 3)

Boreas, EarlyView.
The last (Wisconsinan) glacial period was punctuated in North America by two glacial maxima, known as the Early and Late Wisconsinan glaciations. In Alaska, these maxima and their subsequent retreats have been the object of dating efforts to reconstruct local climatic events and compare them to global trends.
Bruno Belotti, Elizabeth J. Cassel, Timothy C. Bartholomaus, Michael G. Loso, Michael S. Christoffersen, John W. Holt   +5 more
wiley   +1 more source

Моделювання напружено-деформованого стану та взаємодії КНБК із стінками та вибоєм свердловини в лабораторних умовах [PDF]

, 2009
Відображено результати лабораторних досліджень напружено-деформованого стану і взаємодії низу бурильної колони із вибоєм та стінками свердловини.Отображенные результаты лабораторных исследований напряженно деформированного состояния и взаимодействия ...
Мельниченко, Л. Д., Чудик, І. І., Юрич, А. Р., Івасів, В. М.   +3 more
core  

Thorncliffe Formation: A proglacial to subglacial lacustrine basin sequence, Greater Toronto Region, Canada

Boreas, EarlyView.
Map of Lower sediment (LS) thickness is a surrogate for the distribution of Thorncliffe Formation (TF) and ~75% of TF thickness from the slope of Niagara Escarpment east to Brighton. Inset images show the LS sequence at the Don Valleys brickyards (DVBY) and undeformed TF sand and gravel (~15 m) below Newmarket Till (NT) at sites L and Co.
David R. Sharpe, Charles E. Logan, Ross D. Knight, Andre J.‐M. Pugin   +3 more
wiley   +1 more source

Effect of Bit Type on Reactive Torque and Consequent Tool-face-control Anomalies

Shiyou jixie, 2017
In sliding drilling with bend house mud motor, given the same WOB, the reactive torque is greater and the directional drilling is more difficult if the drill bit is more aggressive.
Xu Lihui
doaj