![]() Top minus bottom pipe wall tension (all in-water weights except in-air weight for riser tube):īottom pipe wall tension in riser string above LMRP (3000 k top): ![]() Hang-off ratio of in-water weight to in-air weight of string w/LMRP: f Buoyancy compensation is (in-water weight of bare joint minus in-water weight of joint with buoyancy) divided by in-water weight of bare joint. e In-water weight or joint with buoyancy is in-air weight of a bare joint minus net lift of buoyancy. d In-air weight of joint w/buoyancy is in-air weight of buoyancy plus in-air weight of bare joint. c In-water weight of bare joint equals 0.869 times in-air weight of bare joint. b In-air weight divided try joint length. In-water weight of joint w/buoyancy (lbs) eĪ Information provided. In-air weight of joint w/buoyancy (lbs) d In-air weight of buoyancy an joint (lbs) a In-air weight/length of bare joint (lb/ft) b ![]() Dimensions are then adjusted so that the required strength required for each component results.Ģ2 in. × 1.125 in. Generally, a finite element program is used to determine bending maximum angle at these joints. The dimensions of the stress joint are more difficult to compute since they must be strong and flexible at the same time. In these areas, thicker riser elements are required to limit the stresses. The bending stress is a determining factor at the upper and lower ball joints of the riser. ![]() The capped-end force generated by the internal pressure should also be considered in computing the axial stress. In deepwater, the wall thickness is more dependent on the axial stress. The maximum load hoop stress determined usually governs the wall thickness of the riser pipe. The outside dimensions of all components that must pass through the riser pipe to determine the minimum internal through bore diameter. The wall thickness of each riser string is computed based on maximum load: shut-in pressures, drilling, and completion mud weights to assure design burst and collapse criteria required. Riser design size and specifications, outside and inside diameters, result from the project scope, water depths, and are based on reservoir information, the size of the casings and completion determined, the expected well flow rate, and a bottom-up well design. Peter Aird, in Deepwater Drilling, 2019 Riser Design, Size and Specifications ![]()
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