Results 11 to 20 of about 11,584 (265)
Energy Reports, 2023 Large amplitude and high frequency WOB (weight on bit) fluctuation will lead to problems such as low rock breaking efficiency, short service life and slow drilling speed. This problem is particularly prominent in hard and difficult to drill formation and
Liu Yongwang +5 more
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DRILL BIT SELECTION USING DESIGN OF EXPERIMENTS (DoE) METHOD
Journal of Renewable Energy and Mechanics, 2020 Drilling process is one of the most common machning process in industrial sector. More than half of the metal-cutting processes are conducted by the drilling process. Drill bit has influenced the results of the drilling process.
Rieza Zulrian Aldio, Zainol Mustafa
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Energies, 2021 The longitudinal vibration of the drill pipe contains considerable energy which can be used to improve the rock-breaking efficiency during drilling. It is very important to the development of drilling speed-up tools to have a comprehensive understanding ...
Yuqiang Xu +2 more
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Analytical and experimental study of a reverse circulation drill bit with an annular slit
Advances in Mechanical Engineering, 2016 A new type of drill bit designed with an annular slit was developed to enhance the reverse circulation effect of the down-the-hole hammer drilling technology. A computational fluid dynamics code, Fluent, was used to simulate the flow phenomena inside the
Pinlu Cao +4 more
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Influence of bit size on stability bottom drill column balance when drilling a horizontal well
Известия высших учебных заведений: Нефть и газ, 2021 The article raises the question that if you change the bit type, the "critical length" of the lower part of the drill string change too. For the first time, the issue of the stability of the lower part of the drill string when drilling a horizontal ...
V. G. Griguletsky, A. B. Kuznetsov
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On the formation of limit cycle of the friction-induced stick-slip vibration in oilwell drillstring
Petroleum, 2015 In this paper, the stick-slip vibration in oilwell drillstring is studied. The drilling system is modelled as a lumped-parameter torsional pendulum and the interaction between the drill bit and the rock is treated as Coulomb friction.
Xiaohua Zhu, Liping Tang
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Machines, 2023 Drill bits with internal cooling capabilities are still not employed in stone machining practices within shop floor environments. Therefore, a conventional industrial drill bit used in stone machining was subject to a redesign wherein an axial cooling ...
Miho Klaić +3 more
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Geofluids, 2022 A swirling drill bit designed with an integrated vane swirler was developed to improve reverse circulation in down-the-hole hammer drilling. Its entrainment effect and influential factors were investigated by CFD simulation and experimental tests.
Cheng Yang +6 more
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The Wear Analysis Model of Drill Bit Cutting Element with Torsion Vibration
Advances in Mechanical Engineering, 2015 Due to some deficiencies in the existing researches of cutting element wear of polycrystalline diamond compact (PDC) drill bit and to reduce the wear rate of cutting element of PDC bit, accurately illustrate the effect of tooth-distributing angle on ...
Jialin Tian +7 more
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Eos, Transactions American Geophysical Union, 1996 The International Continental Scientific Drilling Program (ICDP) is seeking proposals by January 15, 1997, for its next cycle of scientific projects.Started in February 1996 as a joint program between Germany's GeoForschungsZentrum‐Potsdam, the United States' National Science Foundation (NSF), and China's Ministry of Geology and Mineral Resources, ICDP
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