Drag Bits

Drag Bit is a common tool which used to rework operation, for drilling cement plug and sinker drilling sand bridge, salt bridge, scraping off the dirt of casing wall and hard wax and some mineral crystallization. Still can scraping well hole, making the wall bright and clean, it may used to drilling ahead in bushing and side track (Can destroy the keyway is formed when side track) or drilling and rubbing the mat of perforating shell, etc.

Under drilling and pressure effect, drilled goods as the cement is sucked at the bottom, through the rotation, the part of sucked is cutting in the direction of circumference, it will be drilling down gradually. Side lobe will be milled by drilling goods, forming cylinder space so that better dressing the well bore by drilling.