深水测试管柱接触非线性力学行为
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摘要
针对深水测试管柱作业过程中的大位移和管柱接触问题,建立深水测试管柱管中管接触非线性耦合分析模型,依据深水测试海况环境和工艺参数施加载荷条件,研究深水测试管柱在典型作业工况下的力学性能和接触规律。研究表明:深水测试管柱的等效应力自上而下逐渐减小,加压射孔和关井回压属于深水测试管柱服役周期中的危险工况;测试管柱顶部位置、下挠性接头和扶正器邻近区域是深水测试管柱的强度弱点,在检测、维修时需要特别关注;深水测试管柱服役过程中与隔水管之间表现出随机接触的规律,测试管柱下挠性接头处接触载荷最大,是深水测试管柱的接触弱点;提高隔水管顶张力和下挠性接头转动刚度、控制浮式平台的作业范围有利于降低下挠性接头处的接触力,减小摩擦和磨损的发生。
In view of the large displacement and contact problems in the service cycle of test strings,a pipe-in-pipe model with nonlinear contact for deep-water test strings was established. The mechanical properties and contact characteristics in typical operation modes were studied,and the boundary conditions were applied based on the operation environment and technical parameters during deepwater testing. The study results show that the equivalent stress of the test string decreases from the top to bottom gradually. The pressure perforating mode and shut-in mode would be risky in the service cycle of deepwater strings,and extra attention should be paid on the string units adjacent to the top of test strings and the lower flex joint where the stress level is much higher. Random contact pattern is found between the test string and riser during the service cycle of the deep-water test string system. The maximum contact load( weak contact point) is found at the lower flex joint of the test string system. Three methods can be given to reduce the contact load at the lower flex joint and thus to reduce the friction and wear,i. e.,improving the tension of the riser top and rotational stiffness of the lower flex joint,and controlling the drift distance of the floating platform.
In view of the large displacement and contact problems in the service cycle of test strings,a pipe-in-pipe model with nonlinear contact for deep-water test strings was established. The mechanical properties and contact characteristics in typical operation modes were studied,and the boundary conditions were applied based on the operation environment and technical parameters during deepwater testing. The study results show that the equivalent stress of the test string decreases from the top to bottom gradually. The pressure perforating mode and shut-in mode would be risky in the service cycle of deepwater strings,and extra attention should be paid on the string units adjacent to the top of test strings and the lower flex joint where the stress level is much higher. Random contact pattern is found between the test string and riser during the service cycle of the deep-water test string system. The maximum contact load( weak contact point) is found at the lower flex joint of the test string system. Three methods can be given to reduce the contact load at the lower flex joint and thus to reduce the friction and wear,i. e.,improving the tension of the riser top and rotational stiffness of the lower flex joint,and controlling the drift distance of the floating platform.
引文
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[18]鞠少栋,畅元江,陈国明,等.超深水钻井作业隔水管顶张力确定方法[J].海洋工程,2011,29(1):100-104.JU Shaodong,CHANG Yuanjiang,CHEN Guoming,et al.Determination methods for the top tension of ultradeepwater drilling risers[J].The Ocean Engineering,2011,29(1):100-104.
[19]LIU J,HE X,WEI X,et al.Calculation of shaft temperature field in deep-water testing system[J].Computer Modelling and New Technologies,2013,17(4):102-111.
[2]陈国明,刘秀全,畅元江,等.深水钻井隔水管与井口技术研究进展[J].中国石油大学学报(自然科学版),2013,37(5):129-139.CHEN Guoming,LIU Xiuquan,CHANG Yuanjiang,et al.Advances in technology of deepwater drilling riser and wellhead[J].Journal of China University of Petroleum(Edition of Natural Science),2013,37(5):129-139.
[3]STOMP R J,FRASER G J,ACTIS S C,et al.Deepwater DST planning and operations from a DP vessel[R].SPE 90557,2004.
[4]CHEN S M,GONG W X,ANTLE G.DST design for deepwater wells with potential gas hydrate problems[R].OTC 19162,2008.
[5]WENDLER C,SCOTT M.Testing and perforating in the HPHT deep and ultra-deep water environment[R].SPE158851,2012.
[6]DIXON M,DAN J,CHAYEB A.Deepwater installation techniques for pipe-in-pipe systems incorporating plastic strains[R].OTC 15373,2003.
[7]WANG H,SUN J,JUKES P.FEA of a laminate internal buckle arrestor for deep water pipe-pipe flowlines[R].OMAE 79520,2009.
[8]SUN J J,JUKES P,ELTAHER A.Finite element analysis ofLoadsharefor the installation of pipe-in-pipe flowline by S-Lay and J-Lay:IEEE Conference,29 Sept.-4Oct.2007[C].Vancouver,BC,Canada,2007.
[9]CHEN Q,CHIA H K.Pipe-in-pipe walking understanding the mechanism,evaluating and mitigating the phenomenon[R].OMAE 20058,2010.
[10]刘康,陈国明,畅元江,等.深水测试管柱密封插管长度确定方法[J].石油机械,2015,43(9):42-46.LIU Kang,CHEN Guoming,CHANG Yuanjiang,et al.A method for determining safe length of seal intubation in deepwater test string[J].China Petroleum Machinery,2015,43(9):42-46.
[11]曾志军,胡卫东,刘竟成,等.高温高压深井天然气测试管柱力学分析[J].天然气工业,2010,30(2):85-87.ZENG Zhijun,HU Weidong,LIU Jingcheng,et al.A mechanical analysis of the gas testing string used in HTHP deep wells[J].Natural Gas Industry,2010,30(2):85-87.
[12]李子丰,蔡雨田,李冬梅,等.地层测试管柱力学分析[J].石油学报,2011,32(4):709-716.LI Zifeng,CAI Yutian,LI Dongmei,et al.Mechanical analysis of pipe string in formation testing[J].Acta Petrolei Sinica,2011,32(4):709-716.
[13]张晓涛.深水完井测试管柱结构设计[D].青岛:中国石油大学(华东),2010.ZHANG Xiaotao.The structure design of well completion test string in deep water[D].Qingdao:China University of Pertoleum(East China),2010.
[14]谢鑫,付建红,张智,等.深水测试管柱动力学分析[J].天然气工业,2011,31(1):77-79,115-116.XIE Xin,FU Jianhong,ZHANG Zhi,et al.Mechanical analysis of deep water well-testing strings[J].Natural Gas Industry,2011,31(1):77-79,115-116.
[15]刘康,陈国明,畅元江,等.深水测试管柱作业条件下平台偏移预警界限[J].石油学报,2014,35(6):1204-1210.LIU Kang,CHEN Guoming,CHANG Yuanjiang,et al.Warning control boundary of platform offset in deepwater test string[J].Acta Petrolei Sinica,2014,35(6):1204-1210.
[16]刘红兵,陈国明,刘康,等.深水测试管柱-隔水管耦合涡激疲劳分析[J].中国石油大学学报(自然科学版),2017,41(1):138-143.LIU Hongbing,CHEN Guoming,LIU Kang,et al.Analysis of VIV-induced fatigue of string-riser coupled system in deepwater[J].Journal of China University of Petroleum(Edition of Natural Science),2017,41(1):138-143.
[17]畅元江,陈国明,孙友义,等.深水钻井隔水管的准静态非线性分析[J].中国石油大学学报(自然科学版),2008,32(3):114-118.CHANG Yuanjiang,CHEN Guoming,SUN Youyi,et al.Quasi-static nonlinear analysis of deepwater drilling risers[J].Journal of China University of Petroleum(Edition of Natural Science),2008,32(3):114-118.
[18]鞠少栋,畅元江,陈国明,等.超深水钻井作业隔水管顶张力确定方法[J].海洋工程,2011,29(1):100-104.JU Shaodong,CHANG Yuanjiang,CHEN Guoming,et al.Determination methods for the top tension of ultradeepwater drilling risers[J].The Ocean Engineering,2011,29(1):100-104.
[19]LIU J,HE X,WEI X,et al.Calculation of shaft temperature field in deep-water testing system[J].Computer Modelling and New Technologies,2013,17(4):102-111.