... and the riser, the overall displacement of the pipe string system simulated by the drilling riser-drill string coupled dynamic model is somewhat suppressed compared to the drilling riser model that ignores the influence of the drill string. However, the effect is not very significant. Under the action...

... ABSTRACT Salt-paste cementing has long faced several challenges including narrow density window, high eccentricity of pipe string, small displacement rate, which make it difficult to ensure an adequate cementing quality. Research has been conducted on reaming technology, small collar casing...

... = = 0.6 = 0.8 0.6 A stl so B stl so ce ceo C stl so si D stl so si ce cei E stl so si ce ceo cei K E I K E I E I K E I I K E I I E I K E I I E I I (1) Where, stlE and ceE are the elastic modulus of the pipe string and cement sheath, Pa; soI , siI , ceoI , ceiI are the section...

... deck radius controller field joint ovality measurement joint coating coating pipe string tensioner field joint area onboard offshore pipeline acergy falcon pipe field joint coating rig ovality radius controller Limitations of Conventional Bending Rigs to Simulate Pipelay Processes...

... installed by bottom pull technique in Asian region. In Korea, as the oil and gas import increases there are number of pipelines constructed recently. pipe string string yard offshore pipeline multi-bundle pipeline installation technique bottom pull method specification korea subject project...

... ABSTRACT In order to reduce the amplitude of longitudinal vibration as well as the axial stress induced in the pipe string, an active control was applied to the mining system. In the proposed system, the string was hung from the mining ship and supported at the upper part with a linear spring...

... ABSTRACT In order to reduce the axial stress produced in the pipe string, multi-stepped pipe strings are taken into consideration. Then, their longitudinal vibrations as well as axial stresses caused by the ship's heave-motion are theoretically analyzed. The results obtained are compared...

...; Reed, 1961) and now it is well established. However, the condition for an absorber used in water has not been found yet in any publications. Using an absorber, the authors (Aso et aI., I 992, 1994a, 1994b, 1995) have studied the longitudinal vibration-control of the pipe string for mining manganese...

...Proceedings of the Seventh (1997) International Offshore and Polar Engineering Conference Honolulu, USA, May 25-30, 1997 Copyright © 1997 by The International Society of Offshore and Polar Engineers ISBN 1-880653-28-1 (Set); ISBN 1-880653-29-X (VoL I) Longitudinal Vibration-Control of Pipe String...

... ABSTRACT In order to reduce the axial stress produced in the pipe string for mining manganese nodules, a threestepped pipe string with larger diameter in the upper part was taken into consideration and its longitudinal vibration caused by the ship's heaving motion was analyzed in case...

... ABSTRACT: In order to reduce the longitudinal vibration of the pipe string for mining manganese nodules from deep sea bottoms, the effects of vibration absorbers with linear springs were studied in the previous reports, indicating that the resonance amplitude of the buffer attached...

... ABSTRACT In order to control the longitudinal vibration of the pipe string in the deep ocean mining system, first, the possibility of an active control system was examined, but the active control was found to be hardly " applicable for that purpose, because It required a large amount of power...

... conditions at the upper point. A portion of the pipe string which is on the surface is used for the definition of these initial conditions. This section is represented as the multispan beam on elastic supports. An iterative procedure of the problem solving is also presented. Numerical results for pipe string...

...Proceedings (/fthe Third (1993) International Off~hore and Polar Engineering Conference Singapore, 6-J1 June 1993 Copyright © 1993 by The International Society of Offshore and Polar Engineers ISBN 1-880653-05-2 (Set); ISBN 1-880653-06-0 (Vol I) Vibration-Control of a Pipe String for Mining...

... of many subsystems. Many activities on the research and development of each subsystem have already been performed. One of the most important structural elements is the pipe strings with its function given by the nodule transfer channel and a means of towing the collector on the sea bed. The pipe strings...

... ABSTRACT In order to reduce the longitudinal vibration of the pipe string for mining manganese nodules in the deep sea, a vibration absorber, which was composed of a mass, springs and dampers, was attached to the pump modules as well as the buffer. Then, the effect of the absorber...

... ABSTRACT There have already been various applications of automatic control theories to different fields of marine development; for instance, autopilots, remotely operated vehicles (R 0 V), dynamic positioning systems (DPS) and pipe string systems for deep sea mining of manganese nodules...

... ABSTRACT: In order to reduce the longitudinal vibration of the pipe string in the deep ocean mining system, a vibration absorber, which was composed of a mass, springs and dampers, was attached to the pump module as well as the buffer. Then, the effect of the absorber on the vibration...