Drill Collar-Standard and Spiral

Besdrill Drill Collar has been approved by the NS-1 certification, it is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.

Parameter of Drill Collar-Standard and Spiral

Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drillsting in tension.

Besdrill Drill Collar has been approved by the NS-1 certification, it is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.

Features and Benefits

  • A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;
  • Connections are completed(phosphate coated)to protect them from the elements after machining and to help prevent galling upon initial make-up;
  • Thread roots are cold rolled on API and H-90 connections;
  • Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections When ordering Please specify;
  • Drill collar OD and ID;
  • Overall length;
  • Connections required (size and type);
  • Special features desired, for example:

Slick or Spiral;

Stress Relief Features;

Slip and/or Elevator Recess;

Hard banding;

umber and connection table Outside Diameter Inside Diameter Length

mm

Belvel Diameter

Mm

Bending

Strength

Ratio

mm In mm in
NC23-31 79.4 3 1/8 31.8 1 1/2 9150 76.2 2.57:1
NC26-35(2 3/8 IF) 88.9 3 1/2 38.1 1 1/2 9150 82.9 2.42:1
NC31-41(2 7/8 IF) 104.8 4 1/8 50.8 2 9150 100.4 2.43:1
NC35-47 120.6 4 3/4 50.8 2 9150 114.7 2.58:1
NC38-50(3 1/2IF) 127 5 57.2 2 1/4 9150 121 2.38:1
NC44-60 152.4 6 57.2 2 1/4 9150 or 9450 144.5 2.49:1
NC44-60 152.4 5 71.4 2 13/16 9150 or 9450 144.5 2.84:1
NC44-62 158.8 6 1/4 57.2 2 1/4 9150 or 9450 149.2 2.91:1
NC44-62(4IF) 158.8 6 1/2 71.4 2 13/16 9150 or 9450 150 2.63:1
NC44-65(4IF) 165.1 6 1/2 57.2 2 1/4 9150 or 9450 154.8 2.76:1
NC44-65(4IF) 165.1 6 1/2 71.4 2 13/16 9150 or 9450 154.8 3.05:1
NC44-67(4IF) 171.4 6 3/4 57.2 2 1/4 9150 or 9450 159.5 3.18:1
NC50-672(4 1/2IF) 171.4 6 3/4 71.4 2 13/16 9150 or 9450 159.5 2.37:1
NC50-70(4 1/2IF) 177.8 7 57.2 2 1/4 9150 or 9450 164.7 2.54:1
NC50-70(4 1/2IF) 177.8 7 71.4 2 13/16 9150 or 9450 164.7 2.73:1
NC50-72(4 1/2IF) 184.2 7 1/4 71.4 2 13/16 9150 or 9450 169.5 3.21:1
NC56-77 196.8 7 3/4 71.4 2 13/16 9150 or 9450 185.3 2.70:1
NC56-80 203.2 8 71.4 2 13/16 9150 or 9450 190.1 3.02:1
6 5/8REG 209.6 8 1/4 71.4 2 13/16 9150 or 9450 195.7 2.93:1
NC61-90 228.6 9 71.4 2 13/16 9150 or 9450        212.7 3.17:1
7 5/8 REG 241.3 9 1/2 76.2 3 9150 or 9450 223.8 2.81:1
NC70-97 247.6 9 3/4 76.2 3 9150 or 9450 232.6 2.57:1
NC70-100 254 10 76.2 3 9150 or 9450 237.3 2.81:1
8 5/8 REG 279.4 11 76.2 3 9150 or 9450 266.7 2.84:1
Slips and elevator grooves can be produced upon the customers’ requirement.

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