Results 131 to 140 of about 69,267 (280)
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 +6 more
doaj
Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration
VibrationThis 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 +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 +3 more
openaire +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 +6 more
doaj
Shiyou jixieDuring 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 +6 more
doaj +1 more source
Measurement of acoustic properties of South Pole ice for neutrino astronomy
, 2008 South Pole ice is predicted to be the best medium for acoustic neutrino detection. Moreover, ice is the only medium in which all three dense-medium detection methods (optical, radio, and acoustic) can be used to monitor the same interaction volume ...
Ackermann +9 more
core +1 more source
Monitoring and Analysis of Frozen Debris Lobes, Phase I [PDF]
, 2012 INE/AUTC 12 ...
Daanen, Ronald P. +2 more
core
Isbaaro: Checkpoints and World Making beyond the State in Somalia
Development and Change, EarlyView.ABSTRACT This article examines the dynamics of checkpoint authority in Somalia, focusing on how kinship, mobility and checkpoint practices intersect to shape political and social orders. Challenging the notion that checkpoint governance is either an expression of state‐like power or indicative of the state's absence, the authors argue that Somali ...
Peer Schouten +2 more
wiley +1 more source
Developmental Medicine &Child Neurology, EarlyView.This scoping review aimed to understand the construct ‘involvement’ in daily life activities from the perspective of children and young people with childhood‐onset disabilities. We identified six conceptual ideas, including a continuum of inner dedication or investment in‐the‐moment, and five others reflecting how children and young people process ...
Vera C Kaelin +4 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. +3 more
core