| 摘要 |
An apparatus, system and method of manufacturing a marine riser constructed of an aluminum alloy having a high strength-to-weight ratio is provided. The inventive riser apparatus comprises a plurality of riser sections coupled serially end-to-end, wherein each of the riser sections comprises a pipe having a first end and a second end, a first flanged coupling welded to the first end of the pipe, and a second flanged coupling welded to the second end of the pipe, wherein the pipe is constructed of an aluminum alloy having a strength-to-weight ratio greater than that of steel. The riser apparatus may optionally include one or more auxiliary lines providing hydraulic communication with a blowout preventer. A method of manufacturing the inventive riser is also disclosed, comprising the steps of forming a first weld between a first flanged coupling and a first end of the pipe, forming a second weld between a second flanged coupling and a second end of the pipe, and heating the welds at a temperature sufficient for annealing the welds, wherein the material used for the welding is composed of an aluminum alloy having a strength-to-weight ratio greater than that of steel. By using a riser of a material having a high strength-to-weight ratio, excellent weldability characteristics, and resistance to corrosion, the present invention allows for offshore drilling operations in deeper waters, increased deckload capabilities, and reduced costs. |
