Results 171 to 180 of about 4,383 (225)

Optical Blaster: Launching Nanostructured Microrockets out of an Optical Trap by a Single Laser Beam. [PDF]

ACS Nano
Ussembayev Y, Arakawa Y, Beunis F, Spoelstra AB, Bus T, Schenning APHJ, Neyts K.   +6 more
europepmc   +1 more source

Tunable 3D optohydrodynamic torques from optical phase gradient-driven colloidal assemblies. [PDF]

Sci Adv
Li X, Liu C, Huang Z, Ng J, Nan F.
europepmc   +1 more source

Tumbleweed-inspired robots with hybrid mobility for terrestrial exploration. [PDF]

Nat Commun
Manoharan S, Lemecho B, Fadlelmula MM, Subramanian V.   +3 more
europepmc   +1 more source

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Torque and Drag Calculations in Multilateral Wells

SPE Nigeria Annual International Conference and Exhibition, 2022
Abstract Multilateral drilling technology has advanced to the point that it is now feasible to explore and extract resources from previously unprofitable reservoirs. It may also help to enhance field development management by allowing for more efficient fluid flow from the formation.
Darlington Etaje, Roman Shor, Reza Lashkari   +2 more
openaire   +1 more source

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

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   +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

Torque and drag field applications in horizontal wells

International Journal of Oil, Gas and Coal Technology, 2017
The 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, Burak Kagan Caglayan, Mustafa Verşan Kök   +2 more
openaire   +1 more source