API SPEC 7-1 Oilfield Slick / Square / Spiral / Non-magnetic drill collar

Description

  1. Material: 4145H/4145Hmod or Non-magnetic.
  2. Standard: API7-1, NS-1.

Note: Non-magnetic Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially non mag drill collar can keep drill bit centralized and hole track by large rigidity. The Drilling collar is manufacturing strictly from API Spec7-1 and SY5411 standards.

  • Spiral Drill Collars

Note: Spiral drill collar is using to reduce contact area with the hole so as to avoid efficiently bit sticking from differential pressure. The drilling collars are manufacturing 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 non mag drill collar. Can be using 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 enhancing. 

Connections OD mm ID mm Length mm
NC23-31 79.4 31.8 9150
NC26-35 88.9 38.1 9150
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

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