Drilling collar
Drill collars(Type A,B andC)are manufactured according to API and SY/T standards .Drill Collars (Type A and B) are made of 4145H chromium molybdenum alloy steel ,chemical composition and residual elements are well controlled.
Drill collars Type c (non-magnetic)are made from low carbon austenitic alloy abtained by combining a proprietary chemical anylysis and a rotary hammer forging process with low magnetic permeability excellent machineability.
Each drill collar is fully inspected by internal inspection dept.All data obtained are recorded on the inspection certificate furnished with eath drill collar.
API monogram ,serial number , OD ,ID ,type and size of connections are stamped on recessed mill flats.
Drill collars are available in lengths from 10 to 31 feet and outside diameter from 3 1/8 to 11
Drill collars Type c (non-magnetic)are made from low carbon austenitic alloy abtained by combining a proprietary chemical anylysis and a rotary hammer forging process with low magnetic permeability excellent machineability.
Each drill collar is fully inspected by internal inspection dept.All data obtained are recorded on the inspection certificate furnished with eath drill collar.
API monogram ,serial number , OD ,ID ,type and size of connections are stamped on recessed mill flats.
Drill collars are available in lengths from 10 to 31 feet and outside diameter from 3 1/8 to 11
Collar Thread | Outside DiameterD | Inside Diameter d | Length L mm | Ledge Chamfer Diameter Df mm | Reference Bending Strength Ratio | ||
mm | in | mm | in | ||||
NC31-41(27/8IF) | 104.8 | 4 1/8 | 50.8 | 2 | 9150 | 100.4 | 2.43:1 |
NC35-47 | 120.7 | 4 3/4 | 50.8 | 2 | 9150 | 114.7 | 2.58:1 |
NC38-50(31/2IF) | 127.0 | 5 | 57.2 | 2 1/4 | 9150 | 121.0 | 2.38:1 |
NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150or9450 | 144.5 | 2.49:1 |
NC44-60 | 152.4 | 6 | 71.4 | 2 13/16 | 9150or9450 | 144.5 | 2.84:1 |
NC44-62 | 158.8 | 61/4 | 57.2 | 2 1/4 | 9150or9450 | 149.2 | 2.91:1 |
NC46-62(4IF) | 158.8 | 61/4 | 71.4 | 2 13/16 | 9150or9450 | 150.0 | 2.63:1 |
NC46-65(4IF) | 165.1 | 61/2 | 57.2 | 2 1/4 | 9150or9450 | 154.8 | 2.76:1 |
NC46-65(4IF) | 165.1 | 61/2 | 71.4 | 2 13/16 | 9150or9450 | 154.8 | 3.05:1 |
NC46-67(4IF) | 171.4 | 63/4 | 57.2 | 2 1/4 | 9150or9450 | 159.5 | 3.18:1 |
NC50-67(41/2IF) | 171.4 | 63/4 | 71.4 | 2 13/16 | 9150or9450 | 159.5 | 2.37:1 |
NC50-70(41/2IF) | 177.8 | 7 | 57.2 | 2 1/4 | 9150or9450 | 164.7 | 2.54:1 |
NC50-70(41/2IF) | 177.8 | 7 | 71.4 | 2 13/16 | 9150or9450 | 164.7 | 2.73:1 |
NC50-72(41/2IF) | 184.2 | 71/4 | 71.4 | 2 13/16 | 9150or9450 | 169.5 | 3.12:1 |
NC56-77 | 196.8 | 73/4 | 71.4 | 2 13/16 | 9150or9450 | 185.3 | 2.70:1 |
NC56-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150or9450 | 190.1 | 3.02:1 |
65/xREG | 209.6 | 81/4 | 71.4 | 2 13/16 | 9150or9450 | 195.7 | 2.93:1 |
NC61-90 | 228.6 | 9 | 71.4 | 2 13/16 | 9150or9450 | 212.7 | 3.17:1 |
