深水测试管柱作业条件下平台偏移预警界限  

Warning control boundary of platform offset in deepwater test string

作　　者：刘康 陈国明 畅元江 刘秀全 孟祥瑜 

机构地区：[1]中国石油大学海洋油气装备与安全技术研究中心,山东青岛266580

出　　处：《石油学报》2014年第6期1204-1210,共7页Acta Petrolei Sinica

基　　金：国家重大科技专项"深水油气田开发钻完井工程配套技术"(2011ZX05026-001-05);教育部长江学者和创新团队发展计划项目"海洋油气井钻完井理论与工程"(IRT1086);中央高校基本科研业务费专项资金项目(14CX06119A;14CX02065A)资助

摘　　要：针对深水测试作业过程中由于浮式平台偏移造成的管柱安全问题,建立深水测试管柱系统接触非线性有限元分析模型,采用磁性搜索算法研究深水作业平台的偏移预警界限,确定浮式平台的测试作业窗口和管柱脱离的安全作业边界,为深水作业平台的科学定位和撤离决策提供理论依据。研究表明:实例平台在表面海流流速低于0.8 m/s、平台偏移不超过19.4 m的条件下可以完成正常的深水测试作业;挠性接头转角和底部井口弯矩是平台偏移预警界限的主导限制因素;随着海流表面流速的增加,测试作业窗口向逆流方向偏移,当达到一定流速时作业窗口的左侧边界出现拐点,窗口迅速收缩;提高外管提升力有利于增大测试作业窗口,测试作业窗口随着井口倾斜角度的增大逐渐向井口倾斜方向平移,但大小和形状基本不变。String safety problems arise from the offset of floating platform during deepwater testing.This study established a contact nonlinear finite element analysis model of deepwater test string system.A magnetic search algorithm was adopted to study warning control boundary of platform offset for deepwater testing.Additionally,the testing operation window of floating platform and the safe operation boundary of string disconnection were determined,in order to provide reference data for scientific positioning and reasonable evacuation decisions in deepwater testing.The results show that surface current speed＜0.8 m/s and platform offset＜ 19.4 m allow the example platform to accomplish normal deepwater testing.Flexible joint angle and subsea wellhead bending moment are the major influencing factors of warning control boundary.As surface current speed increases,the operation window shifts backwards.When surface current speed reaches a certain level,an inflection point appears at the left border of the operation window and the window rapidly narrows down.Increasing the outer pipe tensile force contributes to a larger operation window.With increasing wellhead incline angle,the operation window shifts towards the incline direction while its size and shape of remain unchanged.

关 键 词：深水测试管柱 接触非线性 管中管模型 磁性搜索算法 预警界限 

分 类 号：TE58[石油与天然气工程—油气田开发工程]