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API 7-1 oilfield spiral drill collar
API 7-1 oilfield spiral drill collar-1
API 7-1 oilfield spiral drill collar-2

API 7-1 oilfield spiral drill collar

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Standard and Certification: API
Condition: New
Packing:export packing

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API 7-1 Drill Collar

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 are manufactured strictly API 7-1 standard

Connection Style and Size OD ID Length mm DF     mm Bending ratio
mm in mm in
NC23 79.4 3 1/8 31.8 1 1/4 9150 76.2 2.57:1
NC26 88.9 3 1/2 38.1 1 1/2 9150 82.9 2.42:1
NC31 104.8 4 1/8 50.8 2 9150 or 9450 100.4 2.43:1
NC35 120.7 4 3/4 50.8 2 9150 or 9450 114.7 2.58:1
NC38 127 5 57.2 2 1/4 9150 or 9450 121 2.38:1
NC44 152.4 6 57.2 2 1/4 9150 or 9450 144.5 2.49:1
NC44 152.4 6 71.4 2 13/16 9150 or 9450 144.5 2.84:1
NC44 158.8 6 1/4 57.2 2 1/4 9150 or 9450 149.2 2.91:1
NC46 158.8 6 1/4 71.4 2 13/16 9150 or 9450 150 2.63:1
NC46 165.1 6 1/2 57.2 2 1/4 9150 or 9450 154.8 2.76:1
NC46 165.1 6 1/2 71.4 2 13/16 9150 or 9450 154.8 3.05:1
NC46 171.4 6 3/4 57.2 2 1/4 9150 or 9450 159.5 3.18:1
NC50 171.4 6 3/4 71.4 2 13/16 9150 or 9450 159.5 2.37:1
NC50 177.8 7 57.2 2 1/4 9150 or 9450 164.7 2.54:1
NC50 177.8 7 71.4 2 13/16 9150 or 9450 164.7 2.73:1
NC50 184.2 7 1/4 71.4 2 13/16 9150 or 9450 169.5 3.12:1
NC56 196.8 7 3/4 71.4 2 13/16 9150 or 9450 185.3 2.70:1
NC56 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 228.6 9 71.4 2 13/16 9150 or 9450 212.7 3.17:1
7 5/8REG 241.3 9 1/2 76.2 3 9150 or 9450 223.8 2.81:1
NC70 247.6 9 3/4 76.2 3 9150 or 9450 232.6 2.57:1
NC70 254 10 76.2 3 9150 or 9450 237.3 2.81:1
8 5/8REG 279.4 11 76.2 3 9150 or 9450 266.7 2.84:1

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