Results 231 to 240 of about 510,808 (288)
Some of the next articles are maybe not open access.
Drillstring Analysis With a Discrete Torque/Drag Model
SPE Drilling & Completion, 2013Summary 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 +2 more
openaire +2 more sources
How Good is the Torque-Drag Model?
Proceedings of SPE/IADC Drilling Conference, 2007Abstract 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, 1996Abstract 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
IEEE/ASME transactions on mechatronics, 2020
An electrically activated rotation-flow suction unit uses rotating airflow to generate negative pressure and suction force on a working surface. Because the centrifugal force generated by the rotating flow helps prevent vacuum leakage, the suction unit ...
Kaige Shi, Xin Li
semanticscholar +1 more source
An electrically activated rotation-flow suction unit uses rotating airflow to generate negative pressure and suction force on a working surface. Because the centrifugal force generated by the rotating flow helps prevent vacuum leakage, the suction unit ...
Kaige Shi, Xin Li
semanticscholar +1 more source
Torque and Drag Modeling for Horizontal Openhole Completions
SPE Annual Technical Conference and Exhibition, 2005Proposal 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, 1975AbstractA 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, 2011The 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 +2 more
openaire +1 more source
Tribology Transactions
The relative motion and the presence of oil between two wet clutch disks generates considerable drag torque. Aeration occurring at specific rotational speeds can effectively reduce this drag torque.
M. Sadafi +3 more
semanticscholar +1 more source
The relative motion and the presence of oil between two wet clutch disks generates considerable drag torque. Aeration occurring at specific rotational speeds can effectively reduce this drag torque.
M. Sadafi +3 more
semanticscholar +1 more source