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Drill Collar,Drill Collars,Drilling String

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Description

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





Drill Collar Number O.D. I.D. Length
(mm) Bevel Diameter Ref bend g 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 1/2 IF) 127.0 5 57.2 2 1/4 9150 121.0 2.38:1
NC44-60 152.4 6 57.2 2 1/4 9150 & 9450 144.5 2.49:1
NC44-60 152.4 6 71.4 2 13/16 9150 & 9450 144.5 2.84:1
NC44-62 158.8 6 1/4 57.2 2 1/4 9150 & 9450 149.2 2.91:1
NC46-62(4IF) 158.8 6 1/4 71.4 2 13/16 9150 & 9450 150.0 2.63:1
NC46-65(4IF) 165.1 6 1/2 57.2 2 1/4 9150 & 9450 154.8 2.76:1
NC46-65(4IF) 165.1 6 1/2 71.4 2 13/16 9150 & 9450 154.8 3.05:1
NC46-67(4IF) 171.4 6 3/4 57.2 2 1/4 9150 & 9450 159.5 3.18:1
NC50-67(4 1/2 IF) 171.4 6 3/4 71.4 2 13/16 9150 & 9450 159.5 2.37:1
NC50-70(4 1/2 IF) 177.8 7 57.2 2 1/4 9150 & 9450 164.7 2.54:1
NC50-70(4 1/2 IF) 177.8 7 71.4 2 13/16 9150 & 9450 164.7 2.73:1
NC50-72(4 1/2 IF) 184.2 7 1/4 71.4 2 13/16 9150 & 9450 169.5 3.12:1
NC56-77 196.8 7 3/4 71.4 2 13/16 9150 & 9450 185.3 2.70:1
NC56-80 203.2 8 71.4 2 13/16 9150 & 9450 190.1 3.02:1
6 5/8 REG 209.6 8 1/4 71.4 2 13/16 9150 & 9450 195.7 2.93:1
NC61-90 228.6 9 71.4 2 13/16 9150 & 9450 212.6 3.17:1
7 5/8 REG 241.3 9 1/2 76.2 3 9150 & 9450 223.8 2.81:1
NC70-97 247.6 9 3/4 76.2 3 9150 & 9450 232.8 2.57:1
NC70-100 254 10 76.2 3 9150 & 9450 237.3 2.81:1
8 5/8 REG 279.4 11 76.2 3 9150 & 9450 266.7 2.84:1

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