Drill string
Drill Collars
Heavy, thick-walled tubulars that put weight on the bit.
Overview
Drill collars are thick-walled steel tubulars placed directly above the bit. Their weight provides the force that drives the bit into the rock, and their stiffness keeps the bottom-hole assembly stable.
Spiral drill collars have grooves along their length that reduce wall contact and the risk of differential sticking; slick collars give maximum weight per metre.
Key Features
- Slick and spiral designs
- Slip and elevator recesses on request
- Stress relief features on connections
- Non-magnetic collars for directional surveying on request
Applications
- Bottom-hole assemblies for vertical and directional wells
- Weight on bit for roller cone and PDC bits
- Pendulum and packed-hole assemblies
Need Drill Collars?
Tell us the size, connection, rating and quantity, or send your program. We reply with a quote, data sheet and delivery time.