Results 61 to 70 of about 9,104 (217)
Energies, 2021 Wellbore instability is one of the most serious issues faced in the drilling process. During drilling operations, the cyclic loads applied on the fractured formation progressively modify the initial parameters (i.e., length and width) of the fractured ...
Arnaud Regis Kamgue Lenwoue +7 more
doaj +1 more source
Structural Concrete, EarlyView.Abstract Steel fiber reinforced concrete (SFRC) enhances the flexural capacity of flat slabs and, due to its effectiveness in statically redundant bi‐dimensional elements, represents a viable alternative to conventional reinforcement. Although numerous studies have investigated the flexural behavior of SFRC slabs with and without bonded reinforcement ...
Chiara Gaddi +2 more
wiley +1 more source
Development of small diameter pilot hole directional drilling for trenchless utility installation [PDF]
, 2016 The paper overviews trenchless utility installation techniques and prospects of further development of horizontal directional drilling technology to drill small diameter pilot holes.
Saruev, Aleksey Lvovich +2 more
core +1 more source
LQR Control of Axial-Torsional Bidirectional Vibration of Drill String in Oil and Gas Wells
Shiyou jixieTo effectively solve the failure problem induced by axial-torsional bidirectional vibration of drill string， with the help of the 3-DOF dynamics model of drill pipe， a simulation study was performed on the suppression of linear quadratic regulator （LQR ...
Li Xinye +4 more
doaj +3 more sources
Journal of the Royal Anthropological Institute, EarlyView.Our understanding of the recolonization of northwest Europe in the period leading up to the Lateglacial Interstadial relies heavily on discoveries from Gough's Cave (Somerset, UK). Gough's Cave is the richest Late Upper Palaeolithic site in the British Isles, yielding an exceptional array of human remains, stone and organic artefacts, and butchered ...
Silvia M. Bello +2 more
wiley +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. +2 more
core
The technology improvement and development of the new design-engineering principles of pilot bore directional drilling [PDF]
, 2007 This paper addresses the effectiveness of impact energy use in pilot bore directional drilling at pipe driving. We establish and develop new design-engineering principles for this method.
Bartsch, Stefan +8 more
core +1 more source
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
Дослідження поздовжніх, крутильних і згинальних коливань бурильної колони [PDF]
, 2013 Розглянуто поздовжні, крутильні і згинальні коливання бурильної колони, що виникають під час поглиблення вибою. Наведено рівняння, які показують можливість застосування віброшвидкості для оцінки міцності та надійності труб колони у разі вібрацій ...
Гоголь, В. І. +2 more
core
Meteoritics &Planetary Science, EarlyView.Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson +3 more
wiley +1 more source