Material: 4145H/4145Hmod or Non-magnetic.
Standard: API7-1, NS-1.
Note: Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. The Drilling collar is manufactured strictly from API Spec7-1 and SY5411 standards.
- Spiral Drill Collars
Note: Spiral drill collar is used to reduce contact area with the hole so as to avoid efficiently bit sticking from differential pressure. The drilling collars are manufactured strictly according to API Spec7-1 and Standard SY5144.
- Spiral Drill Collar With Elevator Groove And Slip Groove
Note: Elevator groove and slip groove made on box thread face of slick drilling collar or spiral drill collar can be used as lifting sub and safety slip when tripping out. The technical parameters for elevator groove and slip groove are as per API SPEC7-1. Hardbanding is optional at customers’ requests.
- Non-magnetic Drill Collar
The cold rolled finish on both ID and OD surface with a unique technical process strengthens the structure and ensures the tools with optimal resistance to stress, corrosion, cracking, and mechanical performance is greatly enhanced.
|Connections||OD mm||ID mm||Length mm|
|NC31-41||104.8||50.8||9150 or 9450|
|NC35-47||120.7||50.8||9150 or 9450|
|NC38-50||127.0||57.2||9150 or 9450|
|NC44-60||152.4||57.2||9150 or 9450|
|NC44-60||152.4||71.4||9150 or 9450|
|NC44-62||158.8||57.2||9150 or 9450|
|NC46-62||158.8||71.4||9150 or 9450|
|NC46-65||165.1||57.2||9150 or 9450|
|NC46-65||165.1||71.4||9150 or 9450|
|NC46-67||171.4||57.2||9150 or 9450|
|NC50-67||171.4||71.4||9150 or 9450|
|NC50-70||177.8||57.2||9150 or 9450|
|NC50-70||177.8||71.4||9150 or 9450|
|NC50-72||184.2||71.4||9150 or 9450|
|NC56-77||196.8||71.4||9150 or 9450|
|NC56–80||203.2||71.4||9150 or 9450|
|6 5/8REG||209.6||71.4||9150 or 9450|
|NC61-90||228.6||71.4||9150 or 9450|
|7 5/8REG||241.3||76.2||9150 or 9450|
|NC70-97||247.6||76.2||9150 or 9450|
|NC70-100||254.0||76.2||9150 or 9450|
|8 5/8REG||279.4||76.2||9150 or 9450|