深水钻井动力定位平台允许漂移范围分析

Analysis on allowable drift ranges of deepwater drilling dynamic positioning platform

目前深水钻井动力定位平台允许漂移范围计算需委托国外专业公司分析,且计算过程保密、结果考虑不全面,在分析了南海深水钻井动力定位平台作业风险和平台漂移警戒区划分的基础上,基于深水钻井平台隔水管系统挠性接头和伸缩节物理极限、平台应急解脱程序和作业经验分析,建立了深水钻井动力定位平台允许漂移范围实用计算方法,该方法可对平台极限解脱、红圈、黄圈和绿圈允许漂移范围进行全面的计算,已在国内外多个深水钻井平台数十口深水井得到了成功应用,保证了深水钻井动力定位平台的作业安全。

Currently the analysis of allowable drift ranges of deepwater drilling dynamic positioning platform is entrusted to foreign professional companies. The calculation process is often poorly conifdential and the results not complete. Based on the analysis of oper-ating risks in deepwater drilling dynamic positioning platform in the South China Sea and the zoning of precautionary areas for platform drifting, a practical calculation method of allowable drift range is built by allowing for the physical extreme limits of elastic joint and expansion joint of riser on deepwater drilling platform, the emergency release program, and the operating experience. The method can fully calculate the allowable drift ranges of platform limit release, red circle, yellow circle and green circle. The calculation results have been recognized by platform managers and owners and have been successfully applied in dozens of deepwater wells in many drilling platforms at home and abroad, effectively ensuring the operating safety of deepwater drilling dynamic positioning platform. This record supports the future promotion and application of the method in deepwater drilling practice in China.