Answer to the Letter to the Editor of G.C. Willhuber concerning “Proposal for a new trajectory for subaxial cervical lateral mass screws” by S. Amhaz-Escanlar et al. (Eur Spine J; 2018: doi: 10.1007/s00586-018-5670-5)
Sign Up to like & getrecommendations! Published in 2018 at "European Spine Journal"
DOI: 10.1007/s00586-018-5714-x
Abstract: I really appreciate the questions raised in the letter about our paper [1]. As the designer of the technique, I am more than happy to answer. The rationale behind all this comes from my personal… read more here.
Keywords: lateral mass; answer; drill bit; mass ... See more keywords
Temperature-dependent abrasivity of Bukit Timah granite and implications for drill bit wear in thermo-mechanical drilling
Sign Up to like & getrecommendations! Published in 2020 at "Acta Geotechnica"
DOI: 10.1007/s11440-020-01056-x
Abstract: Thermo-mechanical drilling combines the advantages of flame thermal treatment and rotary head drilling to achieve a high penetration rate in granitic rocks and a low wear rate of drill bits. This drilling strategy has been… read more here.
Keywords: bukit timah; thermo mechanical; drill bit; abrasivity ... See more keywords
Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Central South University"
DOI: 10.1007/s11771-020-4512-x
Abstract: Core discing often occurs in deep rocks under high-stress conditions and has been identified as an important characteristic for deep rock engineering. This paper presents the formation mechanism of core discing firstly. Then, the interaction… read more here.
Keywords: deep rocks; drill bit; core discing; discing characteristics ... See more keywords
Correlation between Cerchar abrasivity index, rock properties, and drill bit lifetime
Sign Up to like & getrecommendations! Published in 2017 at "Arabian Journal of Geosciences"
DOI: 10.1007/s12517-016-2798-7
Abstract: The Cerchar abrasivity index (CAI) is one of the most widely known index method for identification of rock abrasivity. It is a simple and fast testing method providing reliable information on rock abrasiveness. In this… read more here.
Keywords: rock properties; bit; drill bit; abrasivity ... See more keywords
Performance analysis of proportional-integral feedback control for the reduction of stick-slip-induced torsional vibrations in oil well drillstrings
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Sound and Vibration"
DOI: 10.1016/j.jsv.2017.03.013
Abstract: Abstract The stick-slip phenomenon, in the process of drilling oil wells, can lead to large fluctuations in drill-bit angular velocity, due to the interaction between drill-bit and rock formation, and, thus, cause irreparable damage to… read more here.
Keywords: stick slip; proportional integral; angular velocity; velocity ... See more keywords
Mechanical analysis of drill bit during dual-casing sidetracking
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Petroleum Science and Engineering"
DOI: 10.1016/j.petrol.2017.09.040
Abstract: Abstract During dual-casing sidetracking, it is found that the hardness values of productive casing, cement sheath, protective casing and rock stratum are different from each other, and the contact surfaces between the drill bit and… read more here.
Keywords: dual casing; drill bit; casing sidetracking; mechanics ... See more keywords
Working mechanism and rock-breaking characteristics of coring drill bit
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Petroleum Science and Engineering"
DOI: 10.1016/j.petrol.2017.12.047
Abstract: Abstract For improving the rate of penetration of the complex well structure and performance of the coring drill bit, this paper is to investigate a new type of coring drill bit that generates small-diameter core… read more here.
Keywords: mechanism; coring drill; bit; rock breaking ... See more keywords
Evaluation of rock abrasiveness class based on the wear mechanisms of PDC cutters
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Petroleum Science and Engineering"
DOI: 10.1016/j.petrol.2018.12.009
Abstract: Abstract To accurately predict the wearing of a polycrystalline diamond compact (PDC) drill bit and the abrasiveness class of the rocks in the drilled stratum, macroscopic stress conditions during drilling with a PDC drill bit… read more here.
Keywords: wear mechanisms; pdc; pdc drill; abrasiveness class ... See more keywords
Adaptation of Laboratory tests for the assessment of wear resistance of drill-bit inserts for rotary-percussive drilling of hard rocks
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DOI: 10.1016/j.wear.2020.203366
Abstract: Abstract The development of wear resistant materials for drill-bit inserts are of primary importance for efficient percussive drilling in hard abrasive rock. To speed up the development of enhanced wear resistance materials, the laboratory tests… read more here.
Keywords: bit inserts; percussive drilling; impact; drill bit ... See more keywords
Nonlinear Dynamics Modeling and Analysis of Underwater Mud-Penetrator Steering System
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DOI: 10.1109/access.2018.2869386
Abstract: Adopting underwater mud-penetrator to thread the steel wire is one of the important steps in the current wreck salvage process, which is safer and more efficient than threading with manpower by the diver. This paper… read more here.
Keywords: mud; underwater mud; drill bit; mud penetrator ... See more keywords
A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool
Sign Up to like & getrecommendations! Published in 2017 at "IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control"
DOI: 10.1109/tuffc.2016.2633319
Abstract: Traditional rotary drilling for planetary rock sampling, in situ analysis, and sample return are challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity environments. This… read more here.
Keywords: drill tool; drill bit; ultrasonic percussive; drill ... See more keywords