Results 91 to 100 of about 69,267 (280)

An Analytical–Numerical Model for Determining “Drill String–Wellbore” Frictional Interaction Forces

Energies
Currently, drilling of directional oil and gas wells under complex technical-technological and mining-geological conditions requires the use of drill pipes made of various materials.
Michał Bembenek, Yaroslav Grydzhuk, Bożena Gajdzik, Liubomyr Ropyak, Mykhaylo Pashechko, Orest Slabyi, Ahmed Al-Tanakchi, Tetiana Pryhorovska   +7 more
doaj   +1 more source

Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String

Shock and Vibration, 2016
A nonlinear dynamics model and qualitative analysis are presented to study the key effective factors for coupled axial/torsional vibrations of a drill string, which is described as a simplified, equivalent, flexible shell under axial rotation.
Fushen Ren, Baojin Wang, Suli Chen, Zhigang Yao, Baojun Bai   +4 more
doaj   +1 more source

Borehole geological assessment [PDF]

, 1979
A method and apparatus are discussed for performing geological assessments of a formation located along a borehole, and a boring tool that bores a pair of holes into the walls of the borehole and into the surrounding strata along with a pair of probes ...
Spuck, W. H., III
core   +1 more source

The AMANDA Neutrino Telescope: Principle of Operation and First Results [PDF]

, 1999
AMANDA is a high-energy neutrino telescope presently under construction at the geographical South Pole. In the Antarctic summer 1995/96, an array of 80 optical modules (OMs) arranged on 4 strings (AMANDA-B4) was deployed at depths between 1.5 and 2 km ...
AMANDA Collaboration, Andres, E., Askebjer, P., Barwick, S. W., Bay, R., Bergstrom, L., Biron, A., Booth, J., Bouchta, A., Carius, S., Carlson, M., Cowen, D., Dalberg, E., DeYoung, T., Ekstrom, P., Erlandson, B., Goobar, A., Gray, L., Hallgren, A., Halzen, F., Hardtke, R., Hart, S., He, Y., Heukenkamp, H., Hill, G., Hulth, P. O., Hundertmark, S., Jacobsen, J., Jones, A., Kandhadai, V., Karle, A., Koci, B., Leuthold, M., Lindahl, P., Liubarsky, I., Lowder, D. M., Marciniewski, P., Mikolajski, T., Miller, T., Miocinovic, P., Mock, P., Morse, R., Niessen, P., Perez de los Heros, C., Porrata, R., Potter, D., Price, P. B., Przybylski, G., Richards, A., Richter, S., Romenesko, P., Rubinstein, H., Schmidt, T., Schneider, E., Schwarz, R., Solarz, M., Spiczak, G. M., Spiering, C., Streicher, O., Sun, Q., Thollander, L., Thon, T., Tilav, S., Walck, C., Wiebusch, C., Wischnewski, R., Woschnagg, K., Yodh, G.   +67 more
core   +2 more sources

Acoustical properties of drill strings [PDF]

, 1988
The recovery of petrochemical and geothermal resources requires extensive drilling of wells to increasingly greater depths. Real-time collection and telemetry of data about the drilling process while it occurs thousands of feet below the surface is an effective way of improving the efficiency of drilling operations.
openaire   +2 more sources

125 years of exploration and research at Gough's Cave (Somerset, UK) 125 ans d'exploration et de recherches à Gough's Cave (Somerset, Royaume‐Uni)

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, Mark D. Lewis, Simon A. Parfitt   +2 more
wiley   +1 more source

And then there was us Et puis nous sommes apparus

Journal of the Royal Anthropological Institute, EarlyView.
In 1987, the academic conference ‘Origins and Dispersals of Modern Humans: Behavioural and Biological Perspectives’ was held in Cambridge, UK. Subsequently referred to as the ‘Human Revolution’ conference, this meeting brought together the most prominent academics working in the field of human origins, including archaeologists and palaeoanthropologists,
Emma E. Bird, Julia Galway‐Witham, Chris Stringer   +2 more
wiley   +1 more source

Drill String Drag and Torque Test Device Design

Shiyou jixie, 2019
The existing drag and torque theoretical model has many assumptions, leading to a large difference between the calculated value and the true value, which seriously restricts the study of the mechanical behavior of the drill string and the optimization of
吴泽兵, 吕澜涛, 郭龙龙, 王文娟, 张帅   +4 more
doaj  

Дослідження динаміки роботи бурильної колони при буріння свердловини із плавучої установки [PDF]

, 2015
Розглянуто побудову математичної моделі повздовжніх коливань системи «Плавуча бурова установка – компенсатор вертикальних переміщень бурильної колони – бурильна колона – долото» в процесі поглиблення вертикальної свердловини тришарошковим долотом при ...
Слабий, О. О.
core  

A ‘Wholly Unjustifiable Treatment of British Subject’? The Detention of W. T. Goode in the Baltic, 1919

History, EarlyView.
Abstract In the summer of 1919, W. T. Goode, the Manchester Guardian’s special correspondent in Russia and the Baltic, was arrested in the Estonian capital Tallinn and briefly detained aboard a British warship. Goode's detention caused a furore, leading to accusations of kidnap, heated commentary in the press and questions in parliament.
Colin Storer
wiley   +1 more source