Numerical Simulation Study on the Stability of K-type Derrick for Deep-water Drilling Rigs

doi:10.11885/j.issn.1674-5086.2015.10.31.30

Abstract

Abstract: To address the overall weak protection of a K-type derrick and its potential instability in a severe marine environment, taking the motion responses of a deep-water semi-submersible drilling platform under operation regimes in South China Sea as the research setting, a study was thus carried out on the stability of a K-type derrick that is associated with floating drilling platforms. The dynamic load induced by the dynamic boundary of the platform is exerted on the derrick, which can be equivalent to the inertia force that is applied to the derrick. The transverse component of the gravity imposed on the derrick that is attributed to oceanic wind loads and the tilting of the platform as well as additional dynamic loads induced by heaving motions of the platform was considered. This was essential for computing the force-bearing states and overall stability of the derrick using a finite element. The local stability of various member bars under axial forces and biaxial bending moments was investigated. Further, the front legs of the derrick are equivalent to elastic support beams, and buckling analyses were conducted under the influence of axial compressive forces. Further, the stability properties of this drilling derrick used for land rigs were compared. Results demonstrated that ocean environmental loads decrease the stability of K-type derrick considerably; however, the stability requirement for the above-mentioned operation regimes is still satisfied.

Key words: K-type derrick, stability, floating drilling platform, land rig, front leg

CLC Number:

TE52

ZHAO Guanghui, LIU Dandan, WANG Weixu, LIU Jing, ZHAO Bo. Numerical Simulation Study on the Stability of K-type Derrick for Deep-water Drilling Rigs[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 158-164.

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