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Bottom drag/en

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Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-124
... ABSTRACT: High pressure water jets to assist the cutting action of drag tool equipped boom tunnelling machines are now available and recording improved cutting performance. The mechanisms of water jet assistance in reducing the forces experienced by the drag tools are explained in terms...
Proceedings Papers

Paper presented at the 6th World Petroleum Congress, June 19–26, 1963
Paper Number: WPC-10119
... turboforage gether with some particular advantages of the drag bit. en concrétion sont exposées, qui ont démontré l'intérêt du Experiments with impregnated turbodrilling bits are related, développement d'un outil à lame et qui ont prouvé I'infìu- which proved the interest of the development of a blade ence du...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-153
... into the rock cutting action associated with either roller- cone or drag bits for various rock types and borehole pressures. Introduction Resume On examine experimentaJement les rnecha- nismes de fracture de roche et de forma- tion d'eclats de roche qui se produisent quand une seule dent de bit, aiguisee, en...
Journal Articles
J Pet Technol 32 (12): 2247–2252.
Paper Number: SPE-7385-PA
Published: 01 December 1980
... such as foundations and pipelines are susceptible to damage and are likely to be torn out by bottom-dragging and scouring icebergs unless buried sufficiently deep. Alternative production systems such as a floating rig in combination with various forms of subsea installations currently are being examined 1 by the oil...
Proceedings Papers

Paper presented at the 7th World Petroleum Congress, April 2–9, 1967
Paper Number: WPC-12206
... Abstract Résumé The various kinds of rock failure observed in On discute les différents types d'éboulement de laboratory cratering experiments are discussed and roches observés au moyen de cratères en laboratoire compared with those obtained in rock mechanics et on les compare à ceux obtenus...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-022
...) given in Zaghi et al. (2011) or obtained here via the Neumann-Michell theory (NM), of the total drag (left column), the sinkage (middle) and the trim (right) experienced by the Delft catamaran model with hull-separation distances S/L = 0.167 (top row), 0.233 (center), 0.300 (bottom) at Froude numbers...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2002
Paper Number: OTC-14273-MS
... debris flow deposits are the most prominent features in the sediment cores. Deposits are characterized by a basal-uniform to shearlaminated zone that represents the deposition of a basal lubrication zone reducing bottom drag of overflowing debris flows allowing them to run as Bingham flows for several...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-561
... -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 L if t co ef fi ci en t C L Girder bottom height/Tsunami height (Zu/ha 0.0 0.5 1.0 1.5 2.0 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 D ra g c o ef fi ci en t C D Girder bottom height/Tsunami height (Zu/ha 1.73 (a) Drag coefficient (b) Lift coefficient (c) Moment...
Proceedings Papers

Paper presented at the The Sixteenth International Offshore and Polar Engineering Conference, May 28–June 2, 2006
Paper Number: ISOPE-I-06-271
... 1300 -0.01 0.00 0.01 800 900 1000 1100 1200 1300 -0.01 0.00 0.01 800 900 1000 1100 1200 1300 -0.01 0.00 0.01 800 900 1000 1100 1200 1300 2700 m from the sea bottom 2663 m from the sea bottom 1440 m from the sea bottom 890 m from the sea bottom Time (s) Time (s) Time (s) Time (s) D is pl ac em en t (m...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-3108
... with critical AOA=5°~10°. Simulation errors of the lift-to-drag ratio were in the range of 2.29%~16.88% and the average error was 7.43%. Fig. 8 Lift-to-drag ratio of the otter board in relation to the angle of attack 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 29910 44865 59820 74775 89730 104685 L if t co ef fi ci en...
Proceedings Papers

Paper presented at the SNAME 7th International Symposium on Ship Operations, Management and Economics, April 6–7, 2021
Paper Number: SNAME-SOME-2021-014
... httpsec.europa.eu/environment/waste/ships/pdf/report _mepc58.pdf IMO. (2014). Third IMO GHG Study 2014. Retrieved from httpswww.imo.org/en/OurWork/Environment/Pages/ Greenhouse-Gas-Studies-2014.aspx Lumley, J. L. (1964). The reduction of skin friction drag. Paper presented at the Fifth Office of Naval Research...
Proceedings Papers

Paper presented at the Sixth ISOPE Ocean Mining Symposium, October 9–13, 2005
Paper Number: ISOPE-M-05-026
... (track-link speed: 1.5m/s, no current) 0 20 40 60 80 Time(sec) -0.02 -0.01 0 0.01 0.02 M ax im um s he ar d is ol ac em en t(m ) Rear current Drag coefficient : 10.0 Current : 0.1m/s Current : 0.5m/s Current : 1.0m/s Fig. 13 Maximum shear displacement of track bottom (track-link speed: 1.0m/s, rear...
Proceedings Papers

Paper presented at the The Fifteenth International Offshore and Polar Engineering Conference, June 19–24, 2005
Paper Number: ISOPE-I-05-042
...) presented a general theory for evaluating the response of offshore structures in deep water when they are simultaneously subjected to random wave forces and current force, including nonlinearities arising from hydrodynamic drag forces and wave-current-structure interaction. This theory can calculate...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-239
... type is inferior to that of JIS-A type at the anchorage where the sea bottom is the soft mud having the large percentage of the water content, while DA-1 type gives the high holding performance with stability. Therefore, from the viewpoint of the prevention of dragging anchor, attention has to be paid...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, February 20–22, 2007
Paper Number: SPE-105123-MS
... of the facility to the bottom end of the facility by 30% to 100% was found. This increase depends on the fluid flow rate, frequency of the vibrations, fluid type (i.e. viscosity) and magnitude of the applied top load. It was found that this technique highly depends on the viscosity of the drilling fluid used...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-043
... <t Case I M2 = 150t a= 1.00m --Buffer Pump-module Excitation frequency f ( Hz ) Fig.ll The shape-effect of the buffer on the" amplitude of vibration :cr 2.0 l!) Case I a = 1.00 m --M2= 150t MODEL B Ul Ul ~ Ul 1.0 C 'x c E ::J E 'x o 2 o M2=250t M2=50t 0.1 0.2 Excitation frequency f (Hz) Fig.12 The shape-effect of the buffer on the axial stress stress produced by the highest-drag model is about 63% of that produced by the lowest-drag model. Hence, it is highly recommended to use a buffer whose shape causes a higher drag force. ACKNOWLEDGEMENTS The authors wish to express their deep appreciation and profound gratitude to Mr. Masakazu Kurita and Mr. Koji Narita for their assistances during the course of this study and during the preparation of this paper. REFERENCES Aso, K. ,and Kan, K., (1987), "Longitudinal Vibration of a Pipe-String with a Buffer at Its Lower End: Be~avior of a Pipe-String in Mining Manganese Nodules (3rd Report J. Min. Metal. Inst. Japan, Vol.l03, No.1193, pp.443-448. Aso, K., Kan, K.,and Yuan, S1988a), Behavior of a Stepped Pipe-String with a Its Lower End: Behavior of a Pipe-String "Dynamic Buffer at in Mining 308 Manganese Nodules(4th Report J. Min.Metal.lnst. Japan, Vol. 104, No.1205, pp.443-448. Aso, K. ,Kan, K. ,and Mori, M., (I 988b) , "The Drag, and Added-Mass Coefficients of Cylinders VH:>rating Axially in Water," Trans. Japan Soc.Mech.Eng. (Ser.C), Vol.54, No. 507 , pp.2628-2632. Aso~Kan, K., Doki, H.,and Mori, M1989), "The Drag and Added Mass Coefficients of Buffers Vibrating Axially in Water: Studies on the Systems for Mining Mineral Resources from Deep-Sea Bottoms (1st Report J...
Proceedings Papers

Paper presented at the The Eleventh ISOPE Pacific/Asia Offshore Mechanics Symposium, October 12–14, 2014
Paper Number: ISOPE-P-14-093
..., and then the validated method is used to simulate the cavitation flows around the same hydrofoil oriented with several attack angles (Ak = 2°, 5° and 8°) under various water depths (H=0.07m, 0.10m and 0.13m). The foil's drag coefficients, total vapor volumes and the cavity shapes of these free surface cases are compared...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 2–5, 1988
Paper Number: SPE-18047-MS
... force, and the generated torque and drag. The derivation is based on the large de- formation formulation recently presented in 415 ~er~~now the natural coordinate system (Et, En, Eb) will be used instead. This is because the drillstring is assumed to be comr pletely constrained by the borehole...
Proceedings Papers

Paper presented at the The Fifth International Offshore and Polar Engineering Conference, June 11–16, 1995
Paper Number: ISOPE-I-95-120
...) and FHo(tff} for the bottom clearance eID = 0.2 5 ~Re = 1800 4 ~Re = 0.68 10· 3 .. c2 o 0.0 0.5 1.0 1.5 e/D Fig. 3: Variation of the drag coefficient CL for the variable bottom clearances e/D 173 5 ~R. 1800 4 ~RII 0.68 10" 3 :a c2 ot 0.0 0.5 1.0 1.5 e/D Fig. 4: Variation of the inertia coefficient CM...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-039
... upstream oil &amp; gas ultra long ocean pipe displacement axial vibration buffer cross section area drill pipe selection drillstring design equation tension variation pipe displacement pipe tension drag force pipe coefficient excitation period variation bottom end Effects...

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