Experimental Research on Dynamic Responses of Derrick of Offshore Floating Drilling Platform

doi:10.11885/j.issn.16745086.2015.04.28.01

Abstract

Abstract: The drilling rig derrick of floating platform is often subjected to big dynamic loadings from marine environmental pressure and platform movement. In order to evaluate the influence of platform movement on dynamic responses of derrick, a derrick model and six-degree-of-freedom (6-DOF) moving boundaries, which were based on one offshore floating platform and the matching tower-shaped derrick, were designed according to similarity principle and test of the dynamic derrick was carried out by means of large-scale seism simulation test-tables. Acceleration and dynamic strain were measured under vibrational excitations with each single DOF and coupling 6-DOF, which modeled platform movement under operating condition, survival condition and design survival condition. It's found that the derrick is the most impressible to pitch and heave driving, and relatively insensitive to yaw driving. Hook load has little effect on derrick's dynamic responses. Based on the movement of the platform under the combined loads of the wave, current and wind that are from different directions, we find that the dynamic response of the derrick is the strongest with the incidence angle of 180 degree. Experimental results would provide reference for design of the matching derrick for drilling rig of deep-water floating platform.

Key words: deep-water floating platform, drilling rig derrick, experimental research, single DOF driving, coupling 6-DOF driving

CLC Number:

TE52

ZHAO Guanghui, LIANG Zheng, LI Yiping, JIANG Faguang, YE Zhewei. Experimental Research on Dynamic Responses of Derrick of Offshore Floating Drilling Platform[J]. 西南石油大学学报(自然科学版), 2017, 39(4): 159-167.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2015.04.28.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I4/159

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