It is suitable for drilling in where rock formation is overburden and need casing tube to support
Simple structure,simple operation,reliable quality,retrievable drilling tools, and long service life.
Concentric system with ring bits, with wings and with blocks.
- Operation Procedure
- 1. When the drilling starts, the wings swing out, and reams to drive the casing shoes and tubes into the hole.
- 2. When finished the drilling in overburden rock formations, reverse the drilling tools and the wings will get closed, and the drilling tools can be raised from the hole.
- 3. Next construction can be followed.
