Drill Collar Number and Connection Label* | Outside Diameter (Inches) | Bore (Inches) | Length (Feet) | Approximate Weight (lb/ft) | Bevel Diameter (Inches) | Reference Bending Strength Ratio (BSR) |
---|---|---|---|---|---|---|
NC23-31 | 3 1/8 | 1 1/4 | 30 | 22 | 3 | 2.57:1 |
NC26-35 | 3 1/2 | 1 1/2 | 30 | 26.7 | 3 21/64 | 2.42:1 |
NC31-41 | 4.125 | 2 | 30 or 31 | 34.72 | 4 | 2.43:1 |
NC35-47 | 4.375 | 2 | 30 or 31 | 44.51 | 4 33/64 | 2.58:1 |
NC38-50 | 5 | 2 1/4 | 30 or 31 | 53.18 | 4 49/64 | 2.38:1 |
NC44-60 | 6 | 2 1/4 | 30 or 31 | 82.61 | 5 11/16 | 2.49:1 |
NC44-60 | 6 | 2 13/16 | 30 or 31 | 74.9 | 5 11/16 | 2.84:1 |
NC44-62 | 6 1/4 | 2 1/4 | 30 or 31 | 90.52 | 5 7/8 | 2.91:1 |
NC46-62 | 6 1/4 | 2 13/16 | 30 or 31 | 83.09 | 5 29/32 | 2.63:1 |
NC46-65 | 6 1/2 | 2 1/4 | 30 or 31 | 99.19 | 6 3/32 | 2.76:1 |
NC46-65 | 6 1/2 | 2 13/16 | 30 or 31 | 91.59 | 6 3/32 | 3.05:1 |
NC46-67 | 6 3/4 | 2 1/4 | 30 or 31 | 108.02 | 6 9/32 | 3.18:1 |
NC50-70 | 7 | 2 1/4 | 30 or 31 | 117.52 | 6 31/64 | 2.54:1 |
NC50-70 | 7 | 2 13/16 | 30 or 31 | 109.6 | 6 31/64 | 2.73:1 |
NC50-72 | 7 1/4 | 2 13/16 | 30 or 31 | 119.1 | 6 43/64 | 3.12:1 |
NC56-77 | 7 3/4 | 2 13/16 | 30 or 31 | 139.1 | 7 19/64 | 2.70:1 |
NC56-80 | 8 | 2 13/16 | 30 or 31 | 149.6 | 7 31/64 | 3.02:1 |
6 5/8 REG | 8 1/4 | 2 13/16 | 30 or 31 | 160.44 | 7 45/64 | 2.93:1 |
NC61-90 | 9 | 2 13/16 | 30 or 31 | 194.95 | 8 3/8 | 3.17:1 |
7 5/8 REG | 9 1/2 | 3 | 30 or 31 | 217 | 8 13/16 | 2.81:1 |
NC70-97 | 9 3/4 | 3 | 30 or 31 | 230 | 9 5/32 | 2.57:1 |
NC70-100 | 10 | 3 | 30 or 31 | 242.97 | 9 11/32 | 2.81:1 |
8 5/8 REG | 11 | 3 | 30 or 31 | 299 | 10 1/2 | 2.84:1 |
Drill Collar OD | Elevator Recess OD (ER) (In) | Slip Recess OD (SR) (In) | Elevator Recess Radius (R) (In) |
---|---|---|---|
4 3/4 | 4 1/4 | 4 3/8 | 1/8 |
5 | 4 1/2 | 4 5/8 | 1/8 |
6 1/4 | 5 5/8 | 5 3/4 | 1/8 |
6 1/2 | 5 7/8 | 6 | 1/8 |
6 3/4 | 6 | 6 1/4 | 3/16 |
8 | 7 1/4 | 7 1/2 | 3/16 |
8 1/4 | 7 1/2 | 7 3/4 | 3/16 |
9 1/2 | 8 5/8 | 9 | 1/4 |
11 | 10 1/8 | 10 1/2 | 1/4 |
Drill Collar Conn. Size & Type | Min. OD (In) | Bore (In) | Length (Ft) | Bending Strength Ratio | Drill Collar Wt. Per 31 ft |
---|---|---|---|---|---|
NC 38 (3-1/2 IF) | 4 3/4 | 2 1/4 | 31 | 1.92:1 | 1448 |
NC 38 (3-1/2 IF) | 4 3/4 | 2 11/16 | 31 | 2.32:1 | 1270 |
NC 38 (3-1/2 IF) | 5 | 2 1/4 | 31 | 2.38:1 | 1650 |
NC 38 (3-1/2 IF) | 5 | 2 11/16 | 31 | 2.89:1 | 1472 |
NC 46 (4 IF) | 6 1/2 | 2 13/16 | 31 | 3.07:1 | 2842 |
NC 46 (4 IF) | 6 1/2 | 3 1/4 | 31 | 3.59:1 | 2622 |
NC 50 (4 1/2 IF) | 6 3/4 | 2 13/16 | 31 | 2.37:1 | 3115 |
NC 50 (4 1/2 IF) | 6 3/4 | 3 1/4 | 31 | 2.62:1 | 2895 |
6-5/8 REG | 8 | 2 13/16 | 31 | 2.60:1 | 4640 |
6-5/8 REG | 8 | 3 1/4 | 31 | 2.75:1 | 4420 |