Description:

Drill Collar is produced and manufactured by the alloy constructional steel which is formed by forging or finish rolling using AISI 4145H, and it is processed according to the standard API SPEC 7. The heat treatment technique ensure the mechanic performance reach the standard requirements of API SPEC 7, and its Brinell hardness ranges from 285 to 341. Caring out cold rolling depression to the thread root and the lift sub drimple, which can prevent the cracking from spreading and add the bearing pressure of the above radius. The Drill Cillar belongs to the drill stem of the drilling, whch is the pipe to connect the drill head and the drill rod in the drilling operation, and it plays a role in transmitting momentum and stable the drilling instruments. The hollow structure is used for delivering the drilling fluid. The model is shortened by practical tools, and it can show its structure, thread shape and connecting form.

Details: