Drag bitsalso named blade bits, with a TC inserts on the blades.
They areusually designed for use in soft formations such as sand, clay, or some softrock.
Their usesinclude drilling water wells, mining, geothermal, environmental and explorationdrilling.
Wheneverpossible, they should be used to drill pilot holes, for they produce cuttingsthat are easiest to log.
Usually dragbits are three wings, while sometime people need four wings or five wings.
Other specialdesign is available upon your request.
PDC drag bit
Characteristics: highwear resistance and impact-resistant toughness, long drilling life, drillingefficiency can be promoted sharply in penetration of soft medium andmedium-hard formation, laber intensity can be reduced.