Underreaming System

These Underreaming System is the economical version of the P-CON system. Its concentric design consisting of only a driver bit and reamers makes the system very easy to operate and maintain. At the beginning of the operation, the reamers are in the closed position to allow the system to pass through the casing shoe. When drilling commences, the reamers will open up when rotating in clockwise direction, and ream a large enough hole to allow the casing to be carried down the hole. The P-CON-E system has a complete flat face when the reamers are opened, and this effectively improves the penetration rate of the drilling.