By Prof. Dr.-Ing. Günther Clauss, Prof.-Dr.-Ing. Eike Lehmann, Dr.-Ing. Carsten Östergaard (auth.)
ISBN-10: 1447131932
ISBN-13: 9781447131939
ISBN-10: 1447131959
ISBN-13: 9781447131953
This up to date translation from the unique German version presents common history info on oceanology and ocean engineering is given, besides descriptions of drilling suggestions, offshore buildings and hydrocarbon construction at sea. the most a part of the ebook is worried with the hydrostatic and hydrodynamic research of marine constructions, by means of an review of marine constitution reliability. Environmental stipulations affecting marine buildings, wave statistics, and the applying of reliability concept to code improvement also are mentioned. scholars and training engineers who've an curiosity within the research of marine buildings will locate this e-book a useful reference.
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Extra resources for Offshore Structures: Volume I: Conceptual Design and Hydromechanics
Example text
Finally the 7-in oil production string is installed. In most cases all casing strings extend to the landing base. In order to fix the casing in place, a predetermined amount of cement slurry is injected and pumped down the well, between two plugs, using drilling mud, so that the slurry is compressed into the annular space between the new casing and the rock, or the preceding casing, respectively. It is important to keep a check on the level in the mud tank: if it falls, drilling mud is escaping into the formation.
The drill pipe is hauled up three lengths at a time, totalling about 27 m, and unscrewed, for which reason the derrick has to be at least 40-50 m high. Since oil deposits tend to lie some 2000-4000 m below the sea floor, this means that a large quantity of drilling pipe must be handled. Because of the amount and variety of work involved, there is always a danger of accident or breakdown, caused, for example, by fatigue or overloading. Thus, part of the drill string can break off, and must then be either drawn out or blasted clear, for drilling work to continue.
40 Features of Offshore Structures sea state'. As a consequence of these frequent cyclic loadings fatigue damage must be expected, and the design has to assure sufficient fatigue strength. With fixed steel jackets or concrete platforms it is assumed that they remain rigid and motionless throughout the storm. Natural bending oscillations, generally with periods below 2 s at small platform heights, are normally irrelevant, as the spectral wave energy is negligible in this high-frequency band. With increasing water depth and platform height, however, the fundamental natural period of elastic oscillations increases, progressing into a frequency range with substantial wave energy.
Offshore Structures: Volume I: Conceptual Design and Hydromechanics by Prof. Dr.-Ing. Günther Clauss, Prof.-Dr.-Ing. Eike Lehmann, Dr.-Ing. Carsten Östergaard (auth.)
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