The sleeve of this liner is made of zirconia, with superior service life than regular steel sleeve liner, less rig downtime and lowest cost of per operating hour.

1. The zirconium ceramic liners can not only adapted to some tough environment such as deep oil reservoir, hard stratum and severe earthiness, but also can be used for offshore oil and natural gas exploitation as well.

2.Compared with bi-metal liner, the service life of ceramic liner is 5-10 times higher. Its maximum and minimum service life can reach more than 4，000 hours.

3. The zirconium ceramic liners which has used the phase transformation toughen technology has various advantages such as wear-resistance, erosion-resistance, high-pressure-resistance, high-temperature-resistance, high strength and high hardness.

4.The cost of shipment, maintenance, labor and storage in the drilling works can be reduced.