Seismic response of casing string in deepwater oil and gas well based on theory of Timoshenko beam

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (7) : 159-164.

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Seismic response of casing string in deepwater oil and gas well based on theory of Timoshenko beam

HUANG Jin-xiong1，ZHU Xing-ke1,2, HAN Wei-dong1

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Abstract

The soft surface layer has great influence on the stability of subsea casing string in deepwater oil and gas well. Especially, the earthquakes can cause a great bending moment and large shear force on the cross section of casing string. An analytical model for the seismic response of subsea casing string is established on the basis of pile foundation theories and method of reverberation-ray matrix. The casing string is asummed to be a Timoshenko Beam of variable cross section. The bending moments and shear forces of casing string at soft and hard soil cross sections are discussed from the aspect of the shear velocity and thickness of soft surface layer. The results of this work provide reference and guidance for the engineering construction, design and security assessment in practice.

Key words

oil and gas well / casing string / soft surface layer / method of reverberation-ray matrix / seismic response

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HUANG Jin-xiong;ZHU Xing-ke;HAN Wei-dong. Seismic response of casing string in deepwater oil and gas well based on theory of Timoshenko beam[J]. Journal of Vibration and Shock, 2013, 32(7): 159-164