Type: Slick drill collar
Spiral drill collar
Non-magnetic material.
Hard band: Arnco100XT, Arnco200XT and Arnco300XT; Botn1000, Botn3000, TCS8000, TCS-Titanium, Armacor M etc. Also we can make according to customers' requirements.
Size: OD: 3 1/8"~~11"; ID: 1 1/2"Min. Length:10'~~31'
Detail specification
Standard size ,bores and connection for Drill Collar | |||||||
Style of connection | OD | ID | Length | Bevel | Bending strength Ratio | ||
mm | in | mm | in | mm | diameter mm | ||
NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/4 | 9150 | 76.2 | 2.57:1 |
NC26-35(23/8IF) | 88.9 | 3 1/2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42:1 |
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 |
NC3850(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 |
NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150or9450 | 149.2 | 2.91:1 |
NC46-62(4IF) | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150or9450 | 150.0 | 2.63:1 |
NC46-65(4IF) | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150or9450 | 154.8 | 2.76:1 |
NC46-65(4IF) | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150or9450 | 154.8 | 3.05:1 |
NC46-67(4IF) | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150or9450 | 159.5 | 3.18:1 |
NC50-67(41/2IF) | 171.4 | 6 3/4 | 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 | 7 1/4 | 71.4 | 2 13/16 | 9150or9450 | 169.5 | 3.12:1 |
NC50-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150or9450 | 185.3 | 2.70:1 |
NC50-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150or9450 | 190.1 | 3.02:1 |
6 5/8REG | 209.6 | 8 1/4 | 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 |
7 5/8REG | 241.3 | 9 1/2 | 76.2 | 3 | 9150or9450 | 223.8 | 2.81:1 |
NC70-97 | 247.6 | 9 3/4 | 76.2 | 3 | 9150or9450 | 232.6 | 2.57:1 |
NC70-100 | 254.0 | 10 | 76.2 | 3 | 9150or9450 | 237.3 | 2.81:1 |
8 5/8REG | 279.4 | 11 | 76.2 | 3 | 9150or9450 | 266.7 | 2.84:1 |
Mechanical Property of Drill Collar | ||||||
OD | Yield Strength | Tensile Strength | Elongation | Brinell Hardness HB | Charpy | |
mm | in inch | σ 0.2 Mpa | σ b Mpa | 4% | AKVJ | |
79.4-171.4 | 3 1/8-6 3/4 | ≥758 | ≥965 | ≥13 | 285-341 | ≥54 |
177.8-279.4 | 7-11 | ≥689 | ≥930 | |||
Stress Relief Groove for Thread Connection | |||||
Style of Connection | Length between Inner Thread Shoulder and the last Dens | Diameter of Inner Thread | Taper of the Hole nest to inner Thread | Outer Thread Diameter | Length between alternative Inner Thread Shoulder and Stress Relief Groove |
±1.59mm | Dcb+0.40,-0 | ±20.83 | DRG+0 -0.79 | LRG +0 -3.18 | |
mm | mm/m | mm | mm | ||
NC35 | 82.6 | 82.15 | 166.67 | 82.15 | 85.73 |
NC38(3 1/2IF) | 88.9 | 88.11 | 166.67 | 89.3 | 92.08 |
NC44 | 101.6 | 101.6 | 166.67 | 106.36 | 104.78 |
NC46(4IF) | 101.6 | 106.76 | 166.67 | 109.93 | 104.78 |
NC50(4 1/2IF) | 101.6 | 117.48 | 166.67 | 120.65 | 104.78 |
NC56 | 114.3 | 121.84 | 250 | 134.14 | 117.48 |
NC61 | 127 | 132.95 | 250 | 149.25 | 130.18 |
NC70 | 139.7 | 152 | 250 | 171.05 | 142.88 |
6 5/8REG | 114.3 | 134.14 | 166.67 | 137.72 | 117.48 |
7 5/8REG | 120.7 | 133.35 | 250 | 162.72 | 123.83 |
8 5/8REG | 123.8 | 149.25 | 250 | 184.94 | 127 |
Note: The connection of NC23,26,31 and 2 3/8IF are without stress relief groove mould for their thin wall. | |||||
