Results 81 to 90 of about 801 (206)
Effect of vibration dampers on the dynamic state of a drill string
Technology audit and production reserves, 2023 The object of research is the drill string bottom structure using the correcting devices of drilling modes to control the dynamics of the drill string. The work is aimed at the study of longitudinal, torsional and transverse oscillations when adjusting the axial load on the bit by using a drilling shock absorber with a two-link characteristic.
Viktor Svitlytskyi +2 more
openaire +1 more source
Journal of the Royal Anthropological Institute, EarlyView.Our understanding of the recolonization of northwest Europe in the period leading up to the Lateglacial Interstadial relies heavily on discoveries from Gough's Cave (Somerset, UK). Gough's Cave is the richest Late Upper Palaeolithic site in the British Isles, yielding an exceptional array of human remains, stone and organic artefacts, and butchered ...
Silvia M. Bello +2 more
wiley +1 more source
Development of Similarity Theory-based Horizontal Well Drill String Test Apparatus
Shiyou jixie, 2016 In order to conduct research on dynamic properties of drill string in the horizontal well,a horizontal well drill string test apparatus is developed based on parameter correspondence between test model and site prototype.The parameter correspondence is ...
Ren Fushen +3 more
doaj
Meteoritics &Planetary Science, EarlyView.Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson +3 more
wiley +1 more source
Modeling Friction Performance of Drill String Torsional Oscillation Using Dynamic Friction Model
Shock and Vibration, 2017 Drill string torsional and longitudinal oscillation can significantly reduce axial drag in horizontal drilling. An improved theoretical model for the analysis of the frictional force was proposed based on microscopic contact deformation theory and a ...
Xingming Wang +3 more
doaj +1 more source
Aggregate, Volume 7, Issue 6, June 2026.The Graphical Abstract summarizes the key concepts of this review, covering supramolecular assembly strategies, CPP material integration, multicolor emission, information encryption, and flexible optoelectronic applications. ABSTRACT Circularly polarized luminescence (CPL) and room‐temperature phosphorescence (RTP) materials are crucial for advanced ...
Wei Zhang +6 more
wiley +1 more source
Advances in Mechanical Engineering, 2019 Stick–slip vibration is common in the oil well drilling process and is detrimental to down-hole equipment and drilling efficiency. In recent years, a new type of drilling technology, torsional impact drilling, has been developed to mitigate the stick ...
Liping Tang, Wei He, Xiaohua Zhu
doaj +1 more source
Xibei Gongye Daxue Xuebao, 2019 Exploration of oil or gas wells is usually carried out by using drilling system. When the kilometers of drilling system is externally disturbed, the drilling system is prone to undesired stick-slip vibration of the drill-string.
doaj +1 more source
Drill string axial vibration and sonic head analysis
, 2012 This study contains several analyses about vibration generation devices and axial vibration in the drill string. Advanced Drilling Group (ADG) has been seeking new technologies in drilling to improve the rate of penetration (ROP), and in this regard ...
Emtehani Jahromi, Kambiz
core
Band Gap Characteristics of Nonrotating Passive Periodic Drill String
, 2018 A new class of drill strings is investigated whereby strategically designed and placed periodic inserts are utilized to filter out the vibration transmission along the drill strings.
Sassi S., Alsaffar Y., Baz A.
core +2 more sources