Symmetric Casing System with reamer Symmetric Bit for Overburden Drilling

The Symmetric Casing Drilling system consists of three parts: central pilot bit, casing shoe and symmetrical ring bit. The central pilot bit drills away the center part of the hole and guides the drill string, incorporated with a sacrificable symetrical ring bit make a full face drill bit.

Advantages of Symmetric Drilling

• Sound drilling straightness and fast drilling speed.
• The torque necessary for symmetric drilling is much less than that for eccentric drilling.
• Unlocking-relocking can be relatively easily achieved.
• Drilling can be carried out at any angle.
• Effective cuttings discharge.
• Easy-to-operate and system security.
• Economical and cost-effectve.

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