Results 91 to 100 of about 4,494 (274)
EXPERIMENTAL AND NUMERICAL STUDIES OF DRILL-STRING DYNAMICS [PDF]
, 2011 A drill string is the transmission component of rotary drill-rig system used for mining petroleum and natural gas resources. The drill-string system is essentially a long slender structure whose length can be in kilometers. Additionally, the drill-string
Liao, Chien-Min
core
Drill-String Torsional Vibration Suppression Using GA Optimized Controllers
, 2009 Failure of drill-strings is very costly in terms of money and time and occurs more frequently than oil companies would like to see. There are many reasons for drill-string failure, such as vibration, fatigue, and buckling.
Y.L. Abdel-Magid +2 more
core +1 more source
, 2022 This paper aims to present the drill string torsional dynamics through a lumped parameter modeling using the basic physical notions with continuous measurement of drill pipe mechanical properties (inertia, damping, and stiffness).
Youcefi, Mohamed Riad +2 more
core +1 more source
Journal of the Science of Food and Agriculture, EarlyView.Abstract BACKGROUND Preharvest light management is increasingly used to enhance yield and fruit quality in soilless systems, yet its effects on unripe melon fruits remain poorly understood. This study evaluated the impact of supplemental red–blue light‐emitting diode (LED) lighting applied during cultivation in a closed‐cycle hydroponic system on ...
Onofrio Davide Palmitessa +7 more
wiley +1 more source
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
Test report for drill string seal pressure test [PDF]
, 1996 A basic question was asked concerning the drill string which is used in rotary Mode coring operations: ``...what is the volume leak rate loss in a drill rod string under varying condiditons of the joint boxes and pins being either dry or coated with ...
McCormick, J.F.
core +1 more source
Knee Surgery, Sports Traumatology, Arthroscopy, EarlyView.Abstract Purpose To evaluate the accuracy, agreement, and efficiency of a dual‐large language model (LLM) approach using Generative Pre‐Trained Transformer 5.2 (GPT‐5.2) and Google Gemini 3 Pro for automated data extraction in orthopaedic systematic reviews.
Prushoth Vivekanantha +6 more
wiley +1 more source
Stick-Slip Vibration Suppression in Drill String Using Observer-Based LQG Controller. [PDF]
Sensors (Basel), 2022 Riane R +4 more
europepmc +1 more source
BHA and Drill String Fundamentals: Technology Training for Beginners
, 2010 In the industry, there is an abundance of highly technical engineer-based training available on drill string design, but a different approach is required for employees that simply need a basic understanding of drill string principles.
Sarah Wakefield, Katrina Pigusch
core +1 more source
Oikos, EarlyView.Nutrients, including vital organic compounds, vary in availability across ecosystems, with the potential to act as a source of selection for traits that increase nutrient acquisition and biosynthesis. Compared to freshwaters, marine ecosystems are richer in the omega‐3 long‐chain polyunsaturated fatty acid (n‐3 LC‐PUFA) docosahexaenoic acid (DHA ...
Cornelia W. Twining +12 more
wiley +1 more source