摘要
自升式钻井平台是近海石油和边际油田开发的重要设备。据统计,穿刺事故占自升式钻井平台总事故的比例超过了50%,造成平台严重损坏和人员伤亡。以Arab drill 19自升式钻井平台和中国某自升式钻井平台的穿刺事故为例,分析穿刺事故发生的原因,说明穿刺事故的危害。采用投影面积法,分析了中国某自升式钻井平台在渤海某井位发生穿刺事故的可能性,结果表明,该平台存在较大的穿刺风险,并预测了穿刺后的插桩深度。对比平台实际插桩深度,预测结果存在较大误差。结合穿刺研究的最新成果,分析两者存在误差的原因:实际插桩过程中,桩靴底部将形成砂土塞,该砂土塞会极大地提高土体的极限承载能力,导致实际插桩深度比预测插桩深度浅。
Jack-up rigs are widely used in offshore oil and marginal oil field development.According to statistics,punch-through accidents account for more than 50% of jack-up rigs＇ accidents,leading often to serious damages of the jack-up rigs and casualties.Taking the Arab drill 19 jack-up and a Chinese jack-up as examples,the causes of the accidents and the seriousness of consequences are analyzed.The projected area method is used to study the possibility of punch-through for a domestic jack-up at a well site in Bohai Bay.It is found that the punch-through risk at the well site is high.The calculated penetration depth does not agree very well with the actual operational record,with a great error,which is analyzed in this paper based on new research results of punch-through.It is shown that during punch-through in a jack-up rig,a sand plug will be formed under the spudcan of the jack-up rig,which increases the ultimate bearing capacity of soil,and reduces the actual depth.
出处
《科技导报》
CAS
CSCD
北大核心
2010年第17期63-66,共4页
Science & Technology Review
