Analysis and computation method for structural strength of elevating drilling platform

Abstract

The invention discloses an analysis and computation method for the structural strength of an elevating drilling platform, comprising the following steps: building a finite element model according to the structure point of a drilling platform; determining an environment condition according to the operational sea area of the drilling platform; determining a variable load; combining different environmental working conditions with the variable load to obtain different computation working conditions; analyzing and calculating each computation work condition; after each computation working condition is calculated, checking the computation result from seven aspects according to relevant standards; drawing the environmental map of the drilling platform by taking the environment condition and the maximum lifting capacity as parameters; and inquiring the map to obtain the true state of the drilling platform under the practical use condition. The method has the outstanding characteristics of more computation working conditions, more manpower and time are consumed if people manually operate to finish the computation, but the dedicated program software which is compiled by the method and is dedicated for the environmental map can finish all computations within short time. Meanwhile, the software supports parallel computation so as to further shorten computation time.

Description

technical field [0001] The invention relates to an overall performance analysis and survivability evaluation technology of an ocean mobile drilling platform, in particular to a structural strength analysis and calculation method suitable for evaluating the survivability of a jack-up drilling platform under various environmental conditions. Background technique [0002] With the development of the offshore oil industry, the offshore mobile drilling platform has been widely used as an important equipment for offshore oil and gas exploration and exploitation. The jack-up drilling platform belongs to the offshore mobile drilling platform. Due to its strong positioning ability and good operation stability, it is the main force in the oil and gas exploration and development in the continental shelf sea area. Compared with the jacket-fixed drilling platform, the structure of the jack-up drilling platform is more flexible, and the vibration response is stronger. Moreover, with the d...

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Problems solved by technology

[0012] 1. Only typical calculation conditions are considered in the calculation, such as: operation conditions and storm self-storage conditions, and various other environmental conditions that the drilling platform will encounter in actual use are not considered;

[0013] 2. There is a certain difference between the selected environmental parameters and the real environment when the drilling platform is used, and the calculation results cannot reflect the real state of the drilling platform;

[0014] 3. The description of the overall performance of the drilling platform is not comprehensive enough;

[0015] 4. The variable load of each working condition is a certain value during the calculation. Through the calculation, it can only be judged whether the structural strength of the drilling platform meets the requirements under this condition, but it cannot reflect what the drilling platform can withstand under this environmental condition. The maximum variable load, that is, it cannot fully reflect the survivability of the drilling platform, so that the drilling platform cannot be used to the maximum extent;

On the one hand, this will lead to a large workload and a large amount of manpower; on the other hand, it will lead to a long calculation time and a decrease in calculation efficiency.

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