Results 131 to 140 of about 235,371 (297)
Study on Mechanism of Stick–Slip Vibration Based on Torque Characteristics of PDC Bit
Applied SciencesStick–slip vibration (SV) of drill string systems is the main cause of fatigue failure of PDC bits under complex drilling conditions. Exploring its mechanism is helpful for identifying the causes of bit failure and developing preventive measures to ...
Lijun Li, Chunliang Zhang, Aixuan Wu
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Acoustical properties of drill strings
The Journal of the Acoustical Society of America, 1989 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
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 +2 more
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Test on Bending Fatigue Damage of Full-size Drill String
Shiyou jixie, 2017 In the past, the study on the fatigue damage of drill string was mostly modeling or small-scale test, which could not accurately represent the fatigue damage of full-bore drill string.Based on the four-point bending fatigue test, taking the full-size ...
Cheng Caixia +6 more
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Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration
VibrationThis paper presents a comprehensive analysis of the influence of rotary table velocity, weight-on-bit, and viscous damping on the drill string stick–slip vibration.
Mohammad Javad Moharrami +2 more
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Journal of the Royal Anthropological Institute, EarlyView.Food and alcohol indulgence, along with tea‐drinking, gambling, and gossip, are integral to a characteristically Sichuanese ethos of ‘life enjoyment’ (xiangshou shenghuo). Beyond mere pleasure, sensory, ludic, and comic experiences temporarily strip participants of both their formal and subjective qualities.
Angel Nayden
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History, EarlyView.Abstract In March 1976, around 2000 women from forty countries arrived at the Palais des Congrès in Brussels to participate in the first International Tribunal on Crimes Against Women. Explicitly positioning themselves against the United Nations‐led ‘International Year of the Woman’, the organizers and participants of the tribunal proclaimed a global ...
NIVEDITA JOON
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Pulmonary Embolism—A Century of Progress
ANZ Journal of Surgery, EarlyView.Reviews a century of progress in the diagnosis, prevention, and management of pulmonary embolism; from the first successful surgical embolectomy in 1924 to advanced imaging, pharmacological thromboprophylaxis, and treatment. In the 21st century, advances include catheter‐directed thrombolysis or mechanical thrombectomy under decision‐making guidance of
D. A. Watters
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Archaeometry, EarlyView.ABSTRACT This study shows an innovative approach to determine the origin of some Calabrian rocks quarried used in ancient times. Twenty‐five quarries, distributed in all the Calabrian provinces (Southern Italy), were studied and sampled. Ten samples were taken from each quarry, for a total of 250 samples.
Domenico Miriello +5 more
wiley +1 more source
Effect of Bit Type on Reactive Torque and Consequent Tool-face-control Anomalies
Shiyou jixie, 2017 In sliding drilling with bend house mud motor, given the same WOB, the reactive torque is greater and the directional drilling is more difficult if the drill bit is more aggressive.
Xu Lihui
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