Analysis of Drill-String Nonlinear Dynamics Using the Lumped-Parameter Method
Symmetry, 2022 This work aims at studying the nonlinear dynamics of drill strings using the lumped-parameter method (LPM). The study is based on the good consistency of the results of the test problem where the model of the longitudinal vibrations of a horizontal drill
L. Khajiyeva +3 more
semanticscholar +1 more source
Advanced Science, EarlyView.Stochastic nanoscale physical cues induce glioblastoma (GBM)‐associated transcriptional traits in naïve astrocytes leading to spontaneous formation of spheroids. Cells within spheroids express activated‐MMP2 and a differential gene expression pattern involving P53 and NOTCH3, providing evidence for a role for changes in brain topography, as observed in
Laurent Starck +8 more
wiley +1 more source
Nonlinear Static Analysis of Riserless Sampling Drill String in Ultra-deepwater of South China Sea
Shiyou jixie, 2017 With the load effects of current, wave, soil, drifting of drill ship during the sampling drilling process, the rope type drill string has very complex static characteristics featuring geometric nonlinearity and contact nonlinearity.
Gao Guanghai +4 more
doaj
Suppression of Stick-Slip Vibration of Drill String by Fractional-Order PID Control
Shiyou jixie, 2020 Stick-slip vibration of drill string is one of the important reasons leading to accelerated wear and premature damage of drilling equipment, reduced drilling safety and reduced drilling efficiency.
Zhang Qizhi, Xu Shuai
doaj
Експериментальні дослідження неорієнтованих компоновок низу бурильної колони на механічних моделях [PDF]
, 2013 Розглядаються важливі питання підвищення техніко-економічних показників буріння нафтових і газових свердловин за рахунок вдосконалення технічних засобів і науково-методичних основ для їх експериментального дослідження.
Чудик, І. І.
core
Tahiti sea level : the last deglacial sea level rise in the South Pacific [PDF]
, 2005 Integrated Ocean Drilling Program (IODP) Expedition 310 to the reef terraces around Tahiti, French Polynesia, was the second expedition to utilize a mission-specific platform (MSP) and was conducted by the European Consortium for Ocean Research Drilling (
Camoin, Gilbert F. +2 more
core +1 more source
A Tac1‐Expressing Brainstem Pathway Underlies the Pathogenesis of Trigeminal Neuralgia
Advanced Science, EarlyView.A critical TG‐Sp5CTac1‐PBNTac1 pathway drives trigeminal neuropathic pain (TNP). Tac1‐expressing parabrachial nucleus (PBNTac1) neurons exhibit heightened responses to innocuous stimuli in TNP, and chemogenetic inhibition of these neurons effectively prevents TNP development.
Liting Sun +11 more
wiley +1 more source
Analysis of Transverse Vibration of the Drill String in Vertical Section of Horizontal Well
Shiyou jixie, 2017 For the drill string fatigue failure caused by drill string resonance, taking the drill string in the vertical section of a horizontal well in the southwest of China as study object, the inner and outer pressure of the drill string as the function of ...
Cao Yu +5 more
doaj
Комп'ютерне моделювання механічної поведінки бурильних колон у надглибоких похило-скерованих свердловинах [PDF]
, 2007 Исследованы вопросы квазистатического равновесия протяженных криволинейных бурильных колонн. На основе постановки прямой и обратной задачи механики криволинейных гибких стержней сформулированы уравнения баланса внутренних и внешних сил, которые действуют
Гайдайчук, В. В. +3 more
core
State Dependent Delayed Drill-string Vibration : Theory, Experiments and New Model [PDF]
, 2017 L.J. Pei would like to acknowledge NNSF of China (No.
Kapitaniak, Marcin Tomasz +4 more
core +1 more source