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• W323367853 abstract "The demand for drilling operations in Arctic regions is growing significantly due to anincreasing need for oil and gas. The harsh environment in Arctic regions requires safeand acceptable working conditions. In order to still have an acceptable workingenvironment and protection for drilling and pipe handling equipment, it is importantto make improvements in design of upcoming drilling rigs. One of the items thatneeded to be developed is the derrick/drill tower, which today is mainly constructedas a structural framework and has limited working areas where crews can workwithout exposure to the weather and winds. A low structural weight of a derrick isdesired in order to achieve improved and sustained stability conditions.The objectives with the present study is to propose a weight-optimized stressed skinderrick and compare the design with a covered conventional truss derrick with respectto weight and strength.Aker MH has provided data about a conventional truss derrick which was used as areference derrick for input of loads, dimensions and weights in order to design a newderrick. To ensure enough structural strength against yielding and buckling, structuralanalyses were carried out by using a finite element analysis based on 3D beam theory.Numerical optimization of outer plating thickness, stiffeners and stringer dimensionswere performed by using the numerical computation software Matlab.After the optimization against buckling and yielding, a final weight of 465 mT wasachieved. This weight can be compared to a covered conventional truss derrick whichis estimated to 590 mT. The reduction of weight is 21 % compared to a coveredconventional truss derrick. The vertical centre of gravity of the new derrick designwas reduced by 1.5 m. By introducing radius in the corner of a stressed skin derrick,the wind forces acting on the derrick were decreased significantly and this providessustained stability for a drilling unit. Due to lower weight in the new design, themanufacturing costs were reduced by 4.2 MNOK.The obtained weight of the stressed skin derrick is less than the covered conventionaltruss derrick. In order to use the proposed design in the future, a further study shouldbe carried out. To ensure that the designs are safe enough for commercial usage, afatigue analysis needs to be carried out in order to achieve the final design." @default.
• W323367853 created "2016-06-24" @default.
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• W323367853 date "2013-01-01" @default.
• W323367853 modified "2023-09-27" @default.
• W323367853 title "Analytical weight optimization of an enclosed stressed skin derrick" @default.
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