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Mao D.,China University of Petroleum - Beijing | Mao D.,Key Laboratory for Oil Gas Safety Engineering Center | Duan M.,China University of Petroleum - Beijing | Duan M.,Key Laboratory for Oil Gas Safety Engineering Center | And 3 more authors.
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | Year: 2013

To select a suitable floating oil platform for a given deepwater oilfield, a method based on grey-correlation theory was proposed and verified. By analyzing factors that may affect selection of deepwater platform, thirteen main factors were chosen. This article also summed up the statistics on 65 deepwater floating platforms (including tension leg platform, deep-draft column type platform, semi-submersible platform, and floating storage mining and unloading device) performing well in the world. With a deepwater oilfield to be developed as a sample, the application of the method was illustrated: Considering the factor series of the given oilfield to be developed as referent series, the relevance between referent series and factor series of each platform in statistics was calculated with grey-correlation analysis, and the optimal platform was identified as the one that had the highest relevance. Two examples proved the feasibility and reliability of the method.

Mao D.,China University of Petroleum - Beijing | Mao D.,Key Laboratory for Oil Gas Safety Engineering Center | Zhong C.,China University of Petroleum - Beijing | Zhang L.,China University of Petroleum - Beijing | And 3 more authors.
Ocean Engineering | Year: 2015

A 1/10 scale model is investigated to study the influence of the foundation degradation on the dynamic response of an offshore jacket platform. Experiments were conducted in multi-layer saturated soil under different water depth. A vibration exciter which amplitude and frequency could be changed was employed to simulate realistic loads. The model was scaled using dimensional analysis according to the artificial mass similarity principle and Buckingham π theorem. The horizontal dynamic response under the foundation degradation after varying cyclic loadings acted were studied. FE models were designed by means of the lumped parameter method or the equivalent pile technique to handle the pile-soil interaction in ABAQUS to analysis dynamic behavior of the jacket platform. Experimental results shows that the foundation degradation is related to the motion amplitude and the frequency of the piles. The degradation will result in the jacket natural frequency depressed, but it has little impact on the system damping. Comparison of the numerical and experimental results shows that applying the lumped parameter model with p-y curve PSI element to simulate soil-pile-upper structure interaction can obtain much higher accuracy than using the equivalent pile technique. Fair agreement between the experimental and theoretical results was obtained. ©2015 Elsevier Ltd. All rights reserved.

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