3.5" OD SPIRAL DRILL COLLARS
The primary function of the drill collar is to apply weight on the bit. Drill collars do not have welded tool joints (such as integral HWDP) but instead have pin and box connection threads machined directly into the body wall. Spiral grooves may be cut in drill collars to reduce the collar's tendency to differentially stick.
- All drill collars returned with drilling mud, cement or hazardous waste will be cleaned and disposed of at customer's expense.
- Full-length inspection will be performed after each job on all drill collars at customer's expense.
- All repair for abnormal or excessive wear will be charged to customer. (Drill collars will be sold if damaged beyond economical repair.)
- All charges for straightening of collars and refacing and recutting of tool joints will be billed to customer.