Results 21 to 30 of about 16,082 (297)
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
doaj +1 more source
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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A study on PDC drill bits quality [PDF]
, 2013 The quality of innovating PDC (Polycrystalline Diamond Compact) bits materials needs to be determined with accuracy by measuring cutting efficiency and wear rate, both related to the overall mechanical properties.
Gerbaud, Laurent +4 more
core +1 more source
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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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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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
openaire +1 more source
Research on collaborative optimization of cutting and conveying of separated auger drill
Meitan kexue jishu, 2023 Auger drilling tool is widely used in mining, exploration and security and other fields, is an important part of mine equipment, aiming at the best cutting speed and conveying speed of drill tool mismatch.
Qiang ZHANG +4 more
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Planar Solid‐State Nanopores Toward Scalable Nanofluidic Integration Based on CMOS Technology
Advanced Engineering Materials, EarlyView.We present a scalable silicon‐based fabrication strategy for planar solid‐state nanopores to enable their integration with complex nanofluidic systems. Prototype devices demonstrate normal voltage‐current characteristics, good noise performance, and appreciable streaming currents. Our CMOS‐compatible fabrication process offers precise geometric control
Ngan Hoang Pham +7 more
wiley +1 more source
Assessing Altered Coating Adhesion on Plasma‐Deoxidized Surfaces Under Oxygen‐Free Conditions
Advanced Engineering Materials, EarlyView.This study demonstrates the effectiveness of atmospheric pressure plasma pretreatment in modifying silicon and stainless steel surfaces to improve adhesion. Argon‐hydrogen plasma increases surface roughness and improves adhesion strength, whereas pure argon results in smoother surfaces and structural changes.
Selina Raumel +6 more
wiley +1 more source