Results 231 to 240 of about 56,879 (283)
Some of the next articles are maybe not open access.
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
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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
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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
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Dynamic Model for Stiff-String Torque and Drag
SPE Drilling & Completion, 2013SummaryA 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 +6 more
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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
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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
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Torque and drag field applications in horizontal wells
International Journal of Oil, Gas and Coal Technology, 2017The industry of drilling for oil, gas geothermal, and storage purposes necessitates construction of challenging wells in recent applications. Challenging wells are required to be designed prior to the drilling to selection of the equipment to be utilised while drilling.
Tuna Eren +2 more
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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
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Torque and Drag Modeling Advanced Techniques and Troubleshooting
SPE Annual Technical Conference and Exhibition, 2012Abstract 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
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Dynamic Torque and Drag Model Coupled With Transient Hydraulic
Volume 9: Offshore Geotechnics; Petroleum Technology, 2023Abstract A drill-string is an extremely slender mechanical structure and consequently it can oscillate very easily. Drill-string vibrations during drilling operations is the source of many drilling dysfunctions such as decreased drilling performance, damage to downhole equipment, or formation instabilities.
Eric Cayeux +2 more
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AIRCRAFT ACCESSORY DRAG TORQUE DURING ENGINE STARTS
2017<div class="section abstract"> <div class="htmlview paragraph">This SAE Aerospace Information Report (AIR) presents a discussion of drag torques of engine accessories operating at cold temperature. Various conditions of temperature, speed, and acceleration rates are reviewed showing the merits of each method and recommending a standard ...
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