分析了深水救援井井位选择影响因素,针对南中国海深水作业环境及不同平台定位方式提出了救援井与井喷井最小安全距离计算方法,并进行了实例分析。进行深水救援井井位选择时,除了考虑浅水救援井井位选择的影响因素,还存在深水作业环境造成的难点,需要考虑作业期间海况、井场调查资料、井喷井状态和发展趋势,选择的井位对救援井轨迹设计、探测程序、探测工具施工难度、后期动态压井作业的影响,以及平台火灾热辐射半径、平台定位方式等。南中国海深水救援井井位选择要考虑台风和内波流这两个关键因素。对于锚泊定位平台,主要考虑布锚方案、内波流及台风影响;对于动力定位平台,主要考虑平台作业窗口和其他作业船只的影响。基于南中国海深水救援井井位选择影响因素的分析,结合实例给出了救援井井位优选方法。图4表1参16
By analyzing affecting factors on deepwater relief well location selection, and focusing on the regional deepwater operating environment in South China Sea and different rig positioning types, a calculation method for minimum safety distance between reliefs well and blowout well was proposed. In addition to the affecting factors on shallow-water relief well location selection, difficulties which are specific for deepwater operating considerations should be considered for deepwater relief well location selection, including metocean conditions, site survey results, blowout situation and evolution, influences of relief well location on relief well trajectory design, ranging procedure, ranging tool usage and dynamic killing operation, and fire hazard heat radiation and rig positioning types. The most significant factors for deepwater relief well location selection in South China Sea are typhoon and internal solitary wave. For a mooring positioning rig, the main considerations are mooring deployment, internal solitary wave and typhoon. For a dynamic positioning rig, the main considerations are operation window and other vessels. Based on analyses of affecting factors on deepwater relief well location selection in South China Sea, the well location selection method was demonstrated through the discussion of an existing regional well.
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