Results 181 to 190 of about 4,548 (235)

Dynamic Torque and Drag Model

SPE Annual Technical Conference and Exhibition, 2020
Abstract It is generally acceptable to use soft string model for simple wells and stiff string for high dogleg wells. But these models fail to reveal the complex mechanical behaviors of tubular string in tripping in, tripping out, and sliding drilling operations with time as some segments of tubular string may move upward and downward ...
Robello Samuel, Wenjun Huang
openaire   +1 more source

Drillstring Analysis With a Discrete Torque/Drag Model

SPE Drilling & Completion, 2013
Summary The only standard drillstring model in use today is the torque/drag model because of its simplicity and general availability. Field experience indicates that this model generally gives good results but sometimes performs poorly.
Robert F. Mitchell, Arve Bjørset, Gaute Grindhaug   +2 more
openaire   +2 more sources

How Good is the Torque-Drag Model?

Proceedings of SPE/IADC Drilling Conference, 2007
Abstract Perhaps the only "standard" drillstring model in use today is the torque-drag model originally developed by Johancsik (1973) in 1984, and put in a standard form by Sheppard (1987). Because of the simplicity and general availability of this model, it has been used extensively for planning and in the field.
Robert F. Mitchell, Robello Samuel
openaire   +1 more source

Advanced Torque and Drag Considerations in Extended-Reach Wells

IADC/SPE Drilling Conference, 1996
Abstract Excessive torque and drag can be critical limitations in Extended-Reach Drilling (ERD). This paper details issues related to torque and drag prediction, monitoring, and management in ERD wells. Results are presented from sensitivity analyses of extreme ERD trajectories such as 7 to 8 km departures at 1600 m TVD.
M. L. Payne, Fereidoun Abbassian
openaire   +2 more sources

Dynamic Model for Stiff-String Torque and Drag

SPE Drilling & Completion, 2013
SummaryA dynamic stiff-string torque-and-drag (T&D) model is presented that assumes steady-state motion of the drillstring as its basis for calculations. Results are compared with previously published T&D models that are based on static equilibrium.
Vadim Tikhonov, Khaydar Valiullin, Albert Nurgaleev, Lev Ring, Raju Gandikota, Pavel Chaguine, Curtis Cheatham   +6 more
openaire   +1 more source

Torque and Drag Modeling for Horizontal Openhole Completions

SPE Annual Technical Conference and Exhibition, 2005
Proposal Since horizontal openhole sections are now being drilled to lengths that exceed 20,000 ft, placement of the completion string (CS) to planned total depth (TD) may not be possible under a proposed drilling plan. During the early years of horizontal-well construction, the hanging weight of the completion string was usually ...
R. Rezvani, B. Techentien
openaire   +1 more source

A rotational rheometer with a drag‐cup torque transducer

Journal of Polymer Science: Polymer Physics Edition, 1975
AbstractA rotational cone‐and‐plate rheometer incorporating a drag‐cup torque transducer and a frictionless, wire suspension has been designed and constructed. The instrument design provides for a controlled atmosphere for the sample, including anhydrous conditions necessary for studies on solutions of polymers in strong acids.
Guy C. Berry, Chiu‐Ping Wong
openaire   +1 more source

Aeration in Lubrication With Application to Drag Torque Reduction

Journal of Tribology, 2011
The aeration of an oil film flowing between the faces of two closely spaced circular plates (one stationary, and one rotating) is examined experimentally, numerically, and with an improved lubrication model. The gap between the plates is small compared to their radii, making lubrication theory appropriate for modeling the flow.
Chinar R. Aphale, William W. Schultz, Steven L. Ceccio   +2 more
openaire   +1 more source

Calculation and Analysis on Drag Torque of the Wet Clutch

Applied Mechanics and Materials, 2015
In order to study the drag torque characteristics of wet clutch, the drag torque with no groove friction plates and with radial groove friction plates were analysed separately, and the influence factors of the drag torque such as the lubricating oil temperature, the depth of the groove, the average gap between the friction plates were also discussed ...
Li Ying Miao, Xiu Sheng Cheng, Xue Song Li, Li Chen Yang   +3 more
openaire   +1 more source

Torque and Drag Modeling Advanced Techniques and Troubleshooting

SPE Annual Technical Conference and Exhibition, 2012
Abstract Extreme torque and drag (T&D), especially when unplanned, is a primary limiter to the reach of horizontal and extended-reach wells. Many engineers use T&D software models without a thorough understanding of how the input affects the calculations in the program.
John McCormick, Gefei Liu
openaire   +1 more source