CPC Main Group
E21B 17/00 Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings
10 direct subcodes
Child Classifications
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- E21B 17/01 Risers
- E21B 17/02 Couplings; joints
- E21B 17/10 Wear protectors; Centralising devices
- E21B 17/14 Casing shoes
- E21B 17/16 Drill collars
- E21B 17/18 Pipes provided with plural fluid passages
- E21B 17/20 Flexible or articulated drilling pipes
- E21B 17/22 Rods or pipes with helical structure