浅水单点系泊FPSO软刚臂参数敏感性分析
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摘要
软刚臂单点系泊FPSO是浅水油田广泛采用的油气开采设备。为研究单点系泊系统的受力性能,针对一艘作业于浅水油田的16万吨级软刚臂单点系泊FPSO,在线性三维势流理论的基础上,基于多体动力学方法建立FPSO—系泊腿—软刚臂的耦合模型,在时域内计算软刚臂单点系泊系统(SYMS)的动力响应特性;并进行软刚臂单点系泊系统参数敏感性分析,研究软刚臂系泊系统的系泊点高度、系泊刚架高度、软刚臂长度、系泊腿长度、压载舱重量等设计参数的变化对系统动力响应性能的影响。结果表明:单点载荷和系泊腿轴向载荷随着系泊点高度、系泊刚架高度和压载重量的增加先减小后增大,而随着软刚臂长度、系泊腿长度的增加则是先增大后减小;且单点载荷对软刚臂长度和压载重量这2个参数的变化最为敏感,而系泊腿轴向载荷则对系泊刚架高度、软刚臂长度这2个参数的变化最为敏感。
With the aging of FPSO and mooring systems, accidents could occur and pose certain threats onthe safety of production in the oil field. Based on the multi-body dynamics theory, a multi-body couplingmodel, including the soft yoke system and FPSO, is established in this paper. The dynamic response of theSoft Yoke Mooring System(SYMS) is calculated in the time domain based on the linear 3-D potential theo-ry. By selecting different design parameters, such as the height of single point mooring and mooring frames,the length of pendant and soft yoke, and the ballast weight, the sensitivity of force to design parameters ofthe soft yoke mooring system is analyzed. Results show that the loads on the single point and the pendentdecrease first and increase afterward along with the increase of height of single point, height of mooringframe and the ballast weight; while these loads increase first and decrease afterward versus the increase oflength of pendant and length of soft yoke. In brief, the loads on the single point are most sensitive to thechange of length of soft yoke and ballast weight while the loads on the pendent are most sensitive to heightof single point and length of soft yoke.
With the aging of FPSO and mooring systems, accidents could occur and pose certain threats onthe safety of production in the oil field. Based on the multi-body dynamics theory, a multi-body couplingmodel, including the soft yoke system and FPSO, is established in this paper. The dynamic response of theSoft Yoke Mooring System(SYMS) is calculated in the time domain based on the linear 3-D potential theo-ry. By selecting different design parameters, such as the height of single point mooring and mooring frames,the length of pendant and soft yoke, and the ballast weight, the sensitivity of force to design parameters ofthe soft yoke mooring system is analyzed. Results show that the loads on the single point and the pendentdecrease first and increase afterward along with the increase of height of single point, height of mooringframe and the ballast weight; while these loads increase first and decrease afterward versus the increase oflength of pendant and length of soft yoke. In brief, the loads on the single point are most sensitive to thechange of length of soft yoke and ballast weight while the loads on the pendent are most sensitive to heightof single point and length of soft yoke.
引文
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[17]刘滋源,缪国平,刘应中.有限水深对二阶定常波浪力的影响[J].上海交通大学学报,1996,30(10):149-153.LIU Ziyuan,MIAO Guoping,LIU Yingzhong.Influence of water depth on the second order steady wave forces[J].Journal of Shanghai Jiaotong University,1996,30(10):149-153.
[18]Oil Companies International Marine Forum.Prediction of wind and current loads on VLCCs[M].London:Wiserby&Co.Ltd.,1994.
[2]WANG S Q,LI S Y,CHEN X H.Dynamical analysis of a soft yoke moored FPSO in shallow waters[C]//6th International Conference on Asian and Pacific Coasts(APAC).Hong Kong,China,2012.
[3]李淑一,王树青.基于多体分析的浅水FPSO和水下软钢臂系泊系统运动特性研究[J].中国海洋大学学报(自然科学版),2011,41(9):95-102.LI Shuyi,WANG Shuqing.Coupled dynamic analysis of FPSO and underwater soft yoke SPM based on multi body simulation method[J].Periodical of Ocean University of China,2011,41(9):95-102.
[4]李淑一.浅水软刚臂系泊FPSO水动力性能和运动响应数值研究[D].青岛:中国海洋大学,2011.
[5]XIAO L F,YANG J M,LI X.Shallow water effects on surge motion and load of soft yoke moored FPSO[J].China Ocean Engineering,2007(2):187-196.
[6]GUO B,XIAO L F,YANG J M.Analysis on motions and green water of FPSOs in shallow water with non-collinear environments[C]//Proceedings of the ASME 29th International Conference on Ocean,Offshore and Arctic Engineering.Shanghai,China,2010:419-427.
[7]NACIRI M,SERGEN E.Diffraction radiation of135 000 m3storage capacity LNG carrier in shallow water-a benchmark study[C]//Proceedings of the ASME2009 28th International Conference on Ocean,Offshore and Arctic Engineering.Honolulu,Hawaii,USA,2009:637-647.
[8]PHADKE A C,LIAO S W,CHEN D H.Assessment of SYMS survival limit for“Peng Bo”FPSO during installation[C]//Proceedings of The ASME 29th International Confence on Ocean,Offshore and Arctic Engineing.Shanghai,China,2010:541-548.
[9]肖龙飞,杨建民,姚美旺.浮式生产储油轮诱导软刚臂系泊系统的动力响应[J].上海交通大学学报,2007,41(2):162-167.XIAO Longfei,YANG Jianmin,YAO Meiwang.The numerical simulation on dynamic response of SYMS due to FPSO motions[J].Journal of Shanghai Jiaotong University,2007,41(2):162-167.
[10]齐兴斌.FPSO软刚臂单点系泊系统原型测量及分析评价[D].大连:大连理工大学,2012.
[11]陈光.FPSO软刚臂系泊系统运动分析及减振研究[D].大连:大连理工大学,2012.
[12]李欣.软刚臂系泊FPSO水动力响应研究[D].上海:上海交通大学,2005.
[13]REINHOIDTSEN S A,FALKENBERG E.SIMO-theory/user manual[R].MTS1 F93-0184,Marintek,2001.
[14]VERITAS B.Classification of mooring systems for permanent offshore units[J].Guidance Note NI,2008:493.
[15]TENG B,CONG P,GOU Y.Examination on low-frequency QTF of a platform[J].Journal of Hydrodynamics,Ser.B,2010,22(5):969-974.
[16]林青山,缪国平,李谊乐,等.潜体在不同浪向的双色波中受到的二阶慢漂力[J].上海交通大学学报,2000,34(1):1-5.LIN Qingshan,MIAO Guoping,LI Yile,et al.Slowly varying forces on submerged slender body advancing in two waves from different incident angles[J].Journal of Shanghai Jiaotong University,2000,34(1):1-5.
[17]刘滋源,缪国平,刘应中.有限水深对二阶定常波浪力的影响[J].上海交通大学学报,1996,30(10):149-153.LIU Ziyuan,MIAO Guoping,LIU Yingzhong.Influence of water depth on the second order steady wave forces[J].Journal of Shanghai Jiaotong University,1996,30(10):149-153.
[18]Oil Companies International Marine Forum.Prediction of wind and current loads on VLCCs[M].London:Wiserby&Co.Ltd.,1994.