Results 191 to 200 of about 4,537 (232)

Multiphase Drag Modeling for Prediction of the Drag Torque Characteristics in Disengaged Wet Clutches

SAE International Journal of Commercial Vehicles, 2014
<div class="section abstract"><div class="htmlview paragraph">The undesired Drag Torque (DT) which is developed due to the shearing of fluid film in between the disk and separator plate reduces the efficiency of a transmission and increases the fuel consumption of a car.
Shahjada Pahlovy, Syeda Faria Mahmud, Masamitsu Kubota, Makoto Ogawa, Norio Takakura   +4 more
openaire   +1 more source

Torque and Drag Modeling for Horizontal Openhole Completions

Journal of Petroleum Technology, 2006
This article, written by Technology Editor Dennis Denney, contains highlights of paper SPE 97079, "Torque and Drag Modeling for Horizontal Openhole Completions," by R. Rezvani, Halliburton/Sperry Sun, and B. Techentien, Halliburton Energy Services Inc., prepared for the 2005 SPE Annual Technical Conference and Exhibition, Dallas, 9–12 October.
openaire   +1 more source

Oscillatory Drag, Lift, and Torque on a Circular Cylinder in a Uniform Flow

The Physics of Fluids, 1972
Numerical solutions of the equations governing time-dependent, viscous, incompressible fluid flow past a circle are presented for Reynolds numbers 100, 400, and 1000. These solutions show the dramatic rise of the drag coefficient during the development of the Kármán vortex street and reveal the oscillatory character of the drag, lift, and torque that ...
Jordan, Stanley K., Fromm, Jacob E.
openaire   +1 more source

An Innovative Workflow for Real-Time Torque and Drag Monitoring

SPE/IADC International Drilling Conference and Exhibition, 2023
Abstract 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, Chao Mu, Tao Yu, Graeme Paterson   +3 more
openaire   +1 more source

Calculation of Drag Torque Losses by Component of a Transfer Case

SAE Technical Paper Series, 2019
<div class="section abstract"><div class="htmlview paragraph">In recent decades, fuel economy has become a key indicator of an automaker corporate social responsibility and a market differentiation factor, and ultimately it is regulated by government agencies such as EPA through CO₂ emissions compliance tests.
Ricardo Rivera Rodriguez, Carlos Martinez   +1 more
openaire   +1 more source

Effect of Steerable BHA on Drag and Torque In Wells

European Petroleum Conference, 1990
Abstract Steerable bottom hole assemblies are often used when drilling deviated wells. Planning of such deviated wells often include studies of torque and drag calculations for the planned well-path and BHA's in order to have a fairly good idea of friction and torque to be encountered when drilling.
openaire   +1 more source

Quantifying Tortuosities by Friction Factors in Torque and Drag Model

SPE Annual Technical Conference and Exhibition, 2002
Abstract Tortuosity occurs when a well deviates from a straight hole. The most commonly known tortuosity is the local dogleg severity variation associated with the use of steerable motors in "slide/drill/slide" drilling. However, there is a tortuosity that exists in many wells, which the authors will refer to as "micro-tortuosity" in ...
Tom Gaynor, Doug Hamer, David C-K Chen, Darren Stuart   +3 more
openaire   +1 more source

Engineers’ Trilemma: Use and Limitation of Torque and Drag Models

SPE/IADC International Drilling Conference and Exhibition, 2023
Abstract 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
openaire   +1 more source

Analysis of Wet Clutch Drag Torque and Optimization of Drag Torque Reduction Measures

2023
Dongyue Qu, Yunpeng Yun, Dongpeng Zhao
openaire   +1 more source

The Benefits of Monitoring Torque & Drag in Real Time

IADC/SPE Asia Pacific Drilling Technology, 2000
Abstract Monitoring Torque and Drag effects in real time has been done for some time now in the oil industry. However, the service is still used only in a small percentage of the total drilling hours and the analyzing techniques used are quite diverse.
Bart Vos, Reiber Frank
openaire   +1 more source