Symmetric Wings Bits

It is suitable for water wells, geothermal wells , small holes grouting, micro- pile etc.,

The casing shoe is welded to the casing. The pilot bit and ring bit are locked together by the bayonet coupling. 

They drill a hole large enough to allow the casing to be pulled into the hole. 

The pilot bit and ring bit rotate with the drill string while the casing shoe and casing do not rotate. 

When required depth is reached, the pilot bit is unlocked by a slight reverse rotation of the drill string. The drill string and pilot bit will be retrieved through the casing,

 the ring bits and casing shoe will be left in the hole for permanent casing system. 

Also the ring bits and casing can be retrievable through the special design for ring bits and casing shoe. 

We can manufacture both permanent Symmetric and Retrievable Symmetric system which can meet your comprehensive requirement.

How to use?

1.When start work drill string press down and turn right to open the wings, then start to drill along with the casing tube and drilling string together.

2.When the required depth is reached，rotate drilling string reversed, block swings in and then lift drilling string and pull up it from the casing tube.

3.Lifting up casing tubes and grouting in the bottom of hole with some other cement material.

4.To continue drilling with conventional drilling tools in the bedrock.