R&T Group
Drill Collar

Kelly
Kelly
Drill Bit
Drill Bit
Drill Pipe
Drill Pipe

Drill Collar

Specification of Drill Collar

  • Material: Non magnetic steel
  • Hard band: Arnco200XT ,TCS8000
  • Standard: API 5DP
  • RSC Type: NC26 NC31 NC38 NC40 NC46 NC50 NC55 6-5/8FH
  • UPSET: EU(External upset) IU(Internal upset) IEU(Internal & External upset)
  • Technical: Hot Rolled
  • Surface treatment: blank oil painting
  • Packing: 6/9/12 pieces in a bundle, packed with steel holder


Product features of Drill Collar

Thread type

Extranal Diameter

Internal Diameter

Length(mm)

mm

in

mm

in

NC26-35

88.9

3 1/2

31.8

1 1/2

9150

NC35-47

120.7

4 3/4

50.8

2

9150

NC46-62(4IF)

158.8

6 1/4

71.4

2 13/16

9150/9450

NC46-65(4IF)

165.1

6 1/2

57.2

2 1/4

9150/9450


The Features of Drill Collar

  • Put pressure on the drill bit
  • To ensure the necessary strength of compression
  • To reduce the vibration of the drill bit, swing, and beating, so that the drill work smoothly.
  • In the process of drilling well deflection control.
  • Tensile properties as per ASTM A – 370 0.2%  residual deformation specified test bar to configuration.
  • The site of drill collars tensile test specimen should be smaller size when test specimen is cut longitudinally about 3ft (0.9 m) away the end of drill collar, the test specimen’s central line is 25 mm away surface or the wall thick center.
  • Hardness test should follow the requirement of current edition ASTM A – 370, adopt Brinell Hardness ( or Rock – well – c replace) test methods in the outer diameter of drill collars.

Usage of Drill Collar

  • Put pressure on the drill bit
  • To ensure the necessary strength of compression
  • To reduce the vibration of the drill bit, swing, and beating, so that the drill work smoothly
  • In the process of drilling well deflection control
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