Results 81 to 90 of about 248,377 (289)
Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String
Shock and Vibration, 2016 A nonlinear dynamics model and qualitative analysis are presented to study the key effective factors for coupled axial/torsional vibrations of a drill string, which is described as a simplified, equivalent, flexible shell under axial rotation.
Fushen Ren +4 more
doaj +1 more source
Tensions Behind the Trade: How Divergent Service Preferences Shape Peer‐To‐Peer Sharing Choices
Corporate Social Responsibility and Environmental Management, EarlyView.ABSTRACT The landscape of ‘sharing’ services encompasses services ranging from access‐based services (car sharing) to peer‐to‐peer sharing platforms (Couchsurfing). These services differ in the levels of exchange and altruism, creating conflicting consumer motivations.
Vivian S. C. Tunn +2 more
wiley +1 more source
Shiyou jixieIn response to the demand for plugging old wells of CO2 gas storage under the carbon peak and carbon neutrality goals， to address the challenges of deploying wireline logging tools to the bottomhole of highly-deviated and complex-structure wells during ...
Ren Xianke +6 more
doaj +3 more sources
Drill String Drag and Torque Test Device Design
Shiyou jixie, 2019 The existing drag and torque theoretical model has many assumptions, leading to a large difference between the calculated value and the true value, which seriously restricts the study of the mechanical behavior of the drill string and the optimization of
吴泽兵 +4 more
doaj
RESEARCH ON FLEXIBLE DRILL STRING VIBRATION INDUCED BY SONIC HARMONIC EXCITATION
, 2015 The undisturbed sampling of the overburden soil is attracting increased attention due to the rapid increases in the construction of large-scale domestic foundations and environmental protection engineering.
Bairu Xia +3 more
core +1 more source
Deep Underground Science and Engineering, EarlyView.A lithology identification while drilling method was developed, integrating an automated cuttings sampling system, a smart drilling rig, and an ensemble learning model. Underground trials achieved 97.42% accuracy in real‐time identification of cuttings lithology and composition, enhancing hazard management and supporting unmanned drilling technology in
Kun Li +7 more
wiley +1 more source
Deep Underground Science and Engineering, EarlyView.This paper presents temporal and adaptive‐frequency network with MixStyle (TAMNet), a deep time‐series modeling framework for accurate and robust multi‐well oil productivity forecasting. TAMNet integrates transformer and long short‐term memory architectures to capture both short‐ and long‐term temporal dependencies, enhanced by a temporal gate unit ...
Chunxi Yang +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
World's fastest 10 000‐m breakthrough: The XY‐22 well redefines deep‐earth access in the Tarim Basin
Deep Underground Science and Engineering, EarlyView.The Tarim Basin in northwestern China hosts one of the world's deepest petroleum systems, exemplified by the XY‐22 ultra‐deep well (bottom depth: 11 116 m; ~220°C, ~145 MPa). This study integrates tectonic mapping, geological cross‐sections, ultraviolet fluorescence microscopy, and optical photothermal infrared (OPTIR) spectroscopy to characterize ...
Qingwen Tan +4 more
wiley +1 more source
Research on damage progression of drill string material based on the extended finite element method. [PDF]
Sci Prog, 2021 Ying Z, Zhanghua L, Chenxin W, Brice NF.
europepmc +1 more source