Application of suspension packing technique in oversea casing repair well

After finishing drilling of OTRA-6Z horizontal well, lower casing moves freely due to the break-off of ?177.8 mm casing at 663~667 m and the wellbore cannot withstand pressure. In the early stage, many measures were taken, but failed to repair and the well could not be put into production normally. The suspension liner twin packer technique is to use the bi-directional hanger to suspend the pipe string at the top of damaged casing section and adopt the combination of compression packer and water swelling packer above and below the damaged section for the purpose of repair of the damaged casing section. This technique is successfully applied in OTRA- 6Z well, which provides reference and experience for the development of repair scheme of relevant casing.