深水钻井隔水管连接作业窗口分析  

Envelopes for connected operation of the deepwater drilling riser

作　　者：鞠少栋[1] 畅元江[1] 陈国明[1] 刘秀全[1] 许亮斌[2] 王荣耀[1] 

机构地区：[1]中国石油大学(华东)海洋油气装备与安全技术研究中心 [2]中国海洋石油总公司研究总院

出　　处：《石油勘探与开发》2012年第1期105-110,共6页Petroleum Exploration and Development

基　　金：国家科技重大专项课题"深水油气田开发钻完井工程配套技术"(2008ZX05026-001-07);国家自然科学基金项目(50904078);国家高技术研究发展计划"863计划"课题"深水钻井隔水管系统技术研究"(2008AA09A106)

摘　　要：采用通用组合确定准则和非线性搜索方法研究深水钻井隔水管连接作业窗口,建立隔水管-井口-导管整体有限元分析模型,并以钻井平台偏移值、表面海流流速和伸缩节冲程组合参数形式确定隔水管连接作业窗口。研究表明,隔水管钻井窗口总体上呈倒锥形:表面海流流速较小时(小于1.0 m/s),钻井窗口主要受底部挠性接头转角的影响,顺流方向海流流速增加会增大底部挠性接头转角,减小允许的平台最大偏移值,逆流方向相反;当表面海流流速超过1.0 m/s时,钻井窗口主要受顶部挠性接头转角的影响,此时在逆流方向海流流速增加会显著增大顶部挠性接头转角,导致钻井窗口迅速缩小。隔水管连接非钻井和启动脱离程序窗口主要受导管最大等效应力限制,随海流流速增大向逆流方向偏移。另外,通过对隔水管连接作业窗口影响因素进行分析,可知适当提高顶张力和降低钻井液密度可有效扩展隔水管的钻井窗口。The common critical criterion and nonlinear search method were adopted for the study of connected operation envelopes of deepwater drilling platform and a riser-wellhead-conductor integral finite element model was established.The combination parameters of drilling platform offset,current speed and slip joint stroke were used to determine the riser operability envelopes.The results show that the drilling envelope has an upconing shape and is limited by lower flex joint angle when the surface current speed is low（less than 1.0 m/s）.In downstream direction,when the current speed increases,the rotation angle of the lower flex joint increases and the allowable maximum offset of the platform reduces,but in upstream direction,the conditions will be opposite.When surface current speed exceeds 1.0 m/s,the drilling envelope is limited by upper flex joint angle.When it is in upstream direction,the increase of current flow will increase the rotor angle of the upper flexible joint and reduce the drilling envelope rapidly.The non-drilling envelope and emergency disconnect sequence（EDS） actuation envelope are mainly subject to the maximal equivalent stress of the conductor and they will drift towards the upstream direction with the increase of current speed.In addition,through the analysis on influence factors of connection window operation of riser,the tensile force at the top could be increased and drilling fluid density could be reduced properly,so that the drilling envelope could be expanded.

关 键 词：深水钻井 隔水管 钻井窗口 连接非钻井窗口 启动脱离程序窗口 

分 类 号：TE52[石油与天然气工程—油气田开发工程]