水力内割刀在中国东部海区科学钻探套管卡阻事故处理中的应用

Application of the hydraulic internal cutter in the treatment of casing sticking in scientific drilling in the Eastern Sea of China

摘要:

中国东部海区科学钻探CSDP-02井完钻井深2843.18 m。为后续开展相关科研工作，完井后要进行扩孔钻进施工。扩孔前需起拔井内φ114 mm套管，由于套管在井内时间较长，井壁失稳，套管起拔遇卡，无法正常起出。采用水力内割刀工艺，分段割取遇卡套管，提高单次起拔遇卡套管长度，经济、高效地解决了该井套管卡阻事故。本文结合工程实例，对水力内割刀的使用方法及要点进行了阐述。

Abstract:

The scientific drilling borehole CSDP-02 in the Eastern Sea of China was completed at 2843.18m. The borehole needed to be expanded after completion to carry out subsequent research. Before expansion, the 114 mm casing needed to be pulled out; however, the casing cannot be pulled out as usual due to resistance caused by borehole failure. In this research, the hydraulic internal cutter technology was adopted to cut the stuck casing section by section, and increase the pull-out length of stuck casing per run. With this method, casing sticking was solved economically and efficiently. The detailed operation procedure and key points are presented through the field case.