Results 21 to 30 of about 333 (189)
Rotary - percussion drilling method - historical review and current possibilities of application [PDF]
, 2015 'Faster, deeper, cheaper' -it is not just a slogan, it is a motto of every oil company. The first application of rotary--percussion drilling method in drilling oil wells took place in early 60's of the XX century in the United States.
Korzec, M. +4 more
core +1 more source
Research of power impulses transfer through threaded connections of the drill-string during rotary-percussion drilling of pilot holes for trenchless pipeline laying [PDF]
, 2020 Актуальность. Пилотные скважины при горизонтально-направленном бурении можно отнести к скважинам малого диаметра, которые находят широкое применение в горном деле, в частности, для детальной разведки и подземной разработки руд цветных металлов, для ...
Мельнов, Кирилл Вячеславович +9 more
core +1 more source
Experimental study of rock destruction by eccentric impact pulses during rotary-percussion drilling [PDF]
, 2020 Актуальность исследования обусловлена необходимостью поисков путей увеличения предельной глубины бурения скважин ударно-вращательным способом и повышения его производительности.
Нескоромных, Вячеслав Васильевич +3 more
core +1 more source
Study on Mechanism of Hammer Bit and Rock Interaction in Geophysical Prospecting Percussion Drilling [PDF]
, 2011 Percussion drilling has been widely used in oil and gas industry, yet it still has some shortcomings, such as severe damages to drilling tools, low energy transferring efficiency and low rock-fragmenting efficiency.
Yong Tao Fan +4 more
core +1 more source
Shiyou jixieThe compatibility of percussion tools， PDC cutter types and hard rock formations is a key factor in extending the service life of percussion tools and drill bits and achieve the best rock breaking effect， but it has been rarely studied.
Leng Youheng +4 more
doaj +3 more sources
Structural Design and Test of Mechanical Rotary Percussion Drilling Tool
Shiyou jixie, 2020 Rotary percussion drilling technology can greatly increase the ROP of hard formations, but for plastic rocks, rock fragmentation is poor. For this reason, this paper proposes a technical plan for mechanical rotary percussion drilling tool prototype ...
Zhang Haiping
doaj
Elektric rotary-percussion drilling machine of high power –feasibility study [PDF]
Rotary-percussion drilling machines are commonly used for drilling hard-to-cut and abrasive rocks. Currently, in underground mining, drilling jumboswith hydraulic drilling machinesand rotary percussion drilling machines are used in chamber-and-pillar ...
Kozłowski, Artur +3 more
core +1 more source
(Un)threading Rhythms: On Affect and Vibe in a Rave
Anthropology of Consciousness, EarlyView.ABSTRACT In Toronto, raves arise across large nightclubs, DIY venues and outdoors, despite changing regulations that have further arranged and narrowed their possibility in the past 4 years. Following a rave in Toronto, this work explores ways that potentialities and affects emerge in a single night, through my entry of taking part in dancing and ...
Tatiana Yunadi
wiley +1 more source
Shiyou jixie, 2020 High-speed rotary percussive drilling technology is a new type of high-efficiency rock breaking technology based on PDM drilling and self-oscillating rotary percussive drilling.
Yu Yang, Liu Shiyin
doaj
Boreas, EarlyView.Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink +10 more
wiley +1 more source