Abstract
2018年，勘探四号半潜式钻井平台圆满完成韩国大宇弃置项目。在ϕ244.5 mm套管切割回收作业中，采用了新的ϕ244.5 mm套管切割回收工艺，将切割和打捞两项作业结合，仅使用一趟钻具组合就完成套管的切割和回收作业，减少了组合BHA和起下钻次数，简化了作业流程，大大提高了作业的效率和可靠性。
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