Results 261 to 270 of about 62,218 (321)
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An Innovative Workflow for Real-Time Torque and Drag Monitoring
SPE/IADC International Drilling Conference and Exhibition, 2023Abstract Abnormal torque and drag (T & D), which commonly includes overpull, underpull, and high-torque load, are indications of excess frictional effects between the drillstring and the wellbore walls. Numerous conditions can cause these effects, including tight hole, differential sticking, poor hole cleaning, key seats, etc ...
Kewen Sun +3 more
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The Physics of Fluids
Biomass straw fuel has the advantage of low-carbon sustainability, and therefore, it has been widely used in recent years in coupled blending combustion with coal-fired utility boilers for power generation.
Jingliang Wang +7 more
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Biomass straw fuel has the advantage of low-carbon sustainability, and therefore, it has been widely used in recent years in coupled blending combustion with coal-fired utility boilers for power generation.
Jingliang Wang +7 more
semanticscholar +1 more source
Industrial Lubrication and Tribology, 2021
Purpose This paper aims to design a single and double throat oil groove structure, which can reduce the drag torque of the wet clutch. Design/methodology/approach A three-dimensional simulation model was established herein using the computational ...
Chengjun Wang +6 more
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Purpose This paper aims to design a single and double throat oil groove structure, which can reduce the drag torque of the wet clutch. Design/methodology/approach A three-dimensional simulation model was established herein using the computational ...
Chengjun Wang +6 more
semanticscholar +1 more source
Particulate Science and Technology, 2012
The mutual influence of translational and rotational spherical particle movements in calm water was studied using experimental data and numerical simulation. Spherical balls with a density close to that of water were speeded up in special devices, which ensured the required ball rotational and translational velocity in the given plane.
Lukerchenko, N. (Nikolay) +4 more
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The mutual influence of translational and rotational spherical particle movements in calm water was studied using experimental data and numerical simulation. Spherical balls with a density close to that of water were speeded up in special devices, which ensured the required ball rotational and translational velocity in the given plane.
Lukerchenko, N. (Nikolay) +4 more
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Research on Drag Control Algorithm of Cooperative Robot Based on Torque Compensation
ACM Cloud and Autonomic Computing Conference, 2021At present, the teaching methods of collaborative robot drag based on joint current feedback mainly include integral and partial dynamics model, both of which can make robots dragged.
Dezhi Zhu, Yahui Gan, X. Dai
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Drag Torque in Disk Brakes: Significance, Measurement and Challenges
SAE International Journal of Commercial Vehicles, 2015<div class="section abstract"><div class="htmlview paragraph">Drag torque is generated in disk brakes as a result of contact (dynamic friction) between brake disk and brake pads when the braking system is not actuated. Among the negative implications of drag torque are, notably, dispensable additional fuel consumption as well as increased ...
Achim Reich, Angelo Sarda, Martin Semsch
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Stiff String Torque and Drag: Choosing a Realistic Tortuosity Model
IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 2022Abstract Selection of the correct tortuosity model is critical when performing a pre-planning stiff string torque and drag analysis. Various tortuosity models exist in the literature however selection and calibration can be complicated. This paper presents a methodology to aid in selecting an appropriate tortuosity model as well as real ...
Benjamin Nobbs +2 more
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SPE/IADC International Drilling Conference and Exhibition
This paper aims to enhance the accuracy of torque and drag (T&D) predictions by quantitatively analyzing the impact of cuttings bed and fluid properties on the friction coefficient (FC).
S. Baldino, E. Ozbayoglu
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This paper aims to enhance the accuracy of torque and drag (T&D) predictions by quantitatively analyzing the impact of cuttings bed and fluid properties on the friction coefficient (FC).
S. Baldino, E. Ozbayoglu
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Fluid Circulation Effects on Torque and Drag Results, Modeling, and Validation
SPE Drilling & Completion, 2023Summary The hydraulic effects on torque and drag modeling have been thoroughly studied in the past, yet their interpretation still causes a lot of misunderstandings and confusion. Historical models disregard the circulation effects and focus on the fluid mass by employing buoyancy forces based on the Archimedes principle.
M. Mahjoub +3 more
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Engineers’ Trilemma: Use and Limitation of Torque and Drag Models
SPE/IADC International Drilling Conference and Exhibition, 2023Abstract Different methods to calculate torque and drag have been used by the oil industry for years. Various assumptions are used in formulating these models. Opinions have often varied as to which model is better and whether the assumptions are valid. This paper discusses the trilemma considerations for an engineer 1. Soft string model
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