基于Timoshenko梁理论的深水油气井套管柱地震响应分析
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摘要
鉴于海洋表层软土对深水油气井套管柱井身结构稳定性的重要影响,尤其地震发生时,在软硬土层交界面处管柱截面会产生较大弯矩与剪力,据桩基动力响应理论,引入回传射线矩阵法,建立适于深水油气井套管柱的地震响应分析模型。将组合套管柱等效为变截面Timoshenko梁,分别从表层软土剪切波速及厚度分析,探讨套管柱在软硬土层交界面处弯矩与剪力幅值的变化规律,为海洋工程中套管柱的施工、设计及安全性评估提供一定参考及指导。
The soft surface layer has great influence on the stability of a subsea casing string of an oil and gas well in deepwater.Especially,earthquakes can cause a great bending moment and large shear force in cross sections of the casing string.An analysis model for the seismic response of the subsea casing string was established on the basis of pile foundation theories and the method of reverberation-ray matrix.The casing string was asummed to be a Timoshenko beam of variable cross sections.The bending moments and shear forces of the casing string at the interface between soft soil layer and hard one were discussed from the aspects of the shear velocity and thickness of the soft surface layer.The results provided a reference and guidance for construction,design and safety assessment of casing strings in naval engineering.
The soft surface layer has great influence on the stability of a subsea casing string of an oil and gas well in deepwater.Especially,earthquakes can cause a great bending moment and large shear force in cross sections of the casing string.An analysis model for the seismic response of the subsea casing string was established on the basis of pile foundation theories and the method of reverberation-ray matrix.The casing string was asummed to be a Timoshenko beam of variable cross sections.The bending moments and shear forces of the casing string at the interface between soft soil layer and hard one were discussed from the aspects of the shear velocity and thickness of the soft surface layer.The results provided a reference and guidance for construction,design and safety assessment of casing strings in naval engineering.
引文
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[2]Akers T J.Jetting of structural casing in deepwater environments[C].Job Design and Operational Practices.SPE102378,2006.
[3]徐荣强,陈建兵,刘正礼,等.喷射导管技术在深水钻井作业中的应用[J].石油钻探技术,2007,35(3):19-22.XU Rong-qiang,CHEN Jian-bing,LIU Zheng-li,et al.The application of jetting technology in deepwater drilling[J].Petroleum Drilling Techniques,2007,35(3):19-22.
[4]管志川,李春山,周广陈,等.深井和超深井钻井井身结构设计方法[J].石油大学学报(自然科学版),2001,25(6):42-44.GUAN Zhi-chuan,LI Chun-shan,ZHOU Guang-chen,et al.A method for designing casing program in deep and ultra-deep wells[J].Journal of China University of Petroleum(Edition of Natural Science),2001,25(6):42-44.
[5]刘昭蜀,赵焕庭,范时清,等.南海地质[M].北京:科学出版社,2002.
[6]Borcherdt R D.Effects of local geology on ground motion near San Francisco Bay[J].Bulletin of the Seismological Society of America,1970,60(1):29-61.
[7]Taber J J,Smith E G C.Frequency depended amplification of weak ground motions in Porirua and Lower Hutt,New Zealand[J].Bulletin of New Zealand National Society for Earthquake Engineering,1992,25(4):303-331.
[8]Howard S M,Pao Y H.Analysis and experiments on stress waves in planar trusses[J].Journal of Engineering Mechanics,1998,124(8):884-891.
[9]Pao Y H,Keh D C.Dynamic response and wave propagation in plane trusses and frames[J].AIAA Journal,1999,37(5):594-603.
[10]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[11]苏堪华,管志川,苏义脑.深水钻井导管喷射下入深度确定方法[J].中国石油大学学报(自然科学版),2008,32(4):47-50.SU Kan-hua,GUAN Zhi-chuan,SU Yi-nao.Determination method of conductor setting depth using jetting drilling in deepwater[J].Journal of China University of Petroleum(Edition of Natural Science),2008,32(4):47-50.
[12]Timoshenko S P,Goodier J N.Theory of elasticity[M].New York:Third Edition,McGraw-Hill,Incorporated,1970.
[13]Gazetas G,Dobry R.Single radiation damping model for piles and footings[J].Journal of Engineering Mechanics,ASCE,1984,110(6):937-956.
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