Parameter of Standard Drill collar
Drill collars are thick-walled tubulars that are used at the bottom of the drill string. Their principal purpose in the drill string is to provide the axial force needed to advance the drill bit. When drilling a vertical borehole, the axial force is the weight of the drill collars.
Mechanical Performance (Drill Collar)
| Outer diameter | Yidld strength
Rr0.2Mpa |
Ten sile strength
Rm Mpa |
Elongation
(%) |
HB
Hardness |
AKVJ
Impact Tese |
|
| mm | In inch | |||||
| 79.4-171.4 | 31/8-6 3/4 | ≥758 | ≥965 | ≥13 | 285-341 | ≥54 |
| 177.8-279.4 | 7-11 | ≥689 | ≥930 | |||
Drill Collar soecifications
| Drill Collar thread Mode | Outer diameter | Diameter | Length | Chijian diameter Chamfer | Bending strength ratio | ||
| Dmm | in | mm | In | ||||
| NC23-31 | 79.4 | 31/8 | 31.8 | 11/4 | 9150 | 76.2 | 2.57:1 |
| NC31-41(23/8 IF) | 88.9 | 31/2 | 38.1 | 11/2 | 9150 | 82.9 | 2.42:1 |
| NC31-41(27/8 IF) | 104.8 | 41/8 | 50.8 | 2 | 9150 | 100.4 | 2.43:1 |
| NC35-47 | 120.7 | 43/4 | 50.8 | 2 | 9150 | 114.7 | 2.58:1 |
| NC3850(31/2 IF) | 127.0 | 5 | 57.2 | 21/4 | 9150 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 21/4 | 9150 or 9450 | 144.5 | 2.49:1 |
| NC44-62 | 158.8 | 61/4 | 57.2 | 21/4 | 9150 or 9450 | 149.2 | 2.91:1 |
| NC46-62(4 IF) | 158.8 | 61/4 | 71.4 | 213/16 | 9150 or 9450 | 150.0 | 2.63:1 |
| NC46-65(4 IF) | 165.1 | 61/2 | 57.2 | 21/4 | 9150 or 9450 | 154.8 | 2.76:1 |
| NC46-65(4 IF) | 165.1 | 61/2 | 71.4 | 213/16 | 9150 or 9450 | 154.8 | 3.05:1 |
| NC46-67(4 IF) | 171.4 | 63/4 | 57.2 | 21/4 | 9150 or 9450 | 159.5 | 3.18:1 |
| NC50-67(41/2 IF) | 171.4 | 63/4 | 71.4 | 213/16 | 9150 or 9450 | 159.5 | 2.37:1 |
| NC50-70(41/2 IF) | 177.8 | 7 | 57.2 | 21/4 | 9150 or 9450 | 164.7 | 2.54:1 |
| NC50-70(41/2 IF) | 177.8 | 7 | 71.4 | 213/16 | 9150 or 9450 | 164.7 | 2.73:1 |
| NC50-72(41/2 IF) | 184.2 | 71/4 | 71.4 | 213/16 | 9150 or 9450 | 169.5 | 3.12:1 |
| NC50-77 | 196.8 | 73/4 | 71.4 | 213/16 | 9150 or 9450 | 185.3 | 2.70:1 |
| NC50-80 | 203.2 | 8 | 71.4 | 213/16 | 9150 or 9450 | 190.1 | 3.02:1 |
| 65/8 REG | 209.6 | 81/4 | 71.4 | 213/16 | 9150 or 9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 213/16 | 9150 or 9450 | 212.7 | 3.17:1 |
| 75/8 REG | 241.3 | 91/2 | 76.2 | 3 | 9150 or 9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 93/4 | 76.2 | 3 | 9150 or 9450 | 232.6 | 2.57:1 |
| NC70-100 | 254.0 | 10 | 76.2 | 3 | 9150 or 9450 | 237.3 | 2.81:1 |
| 85/8 REG | 279.4 | 11 | 76.2 | 3 | 9150 or 9450 | 266.7 | 2.84:1 |
Stress thread connecting parts scattered trough
| Drill Collar screw type | Thread shoulder after a tooth sur-face to the length of ±1.59mm | In the thread diameter of the cylinder Dcb +0.4,-0mm | Thread of the cylindrical hole taper cone ±20.83mm | Thread of the cylindrical hole taper cone ±20.83mm | Thread alternative to the shoulder-length of the trough scattered LRG ±0-3.18mm |
| NC35 | 82.6 | 82.15 | 166.67 | 82.15 | 85.73 |
| NC38(31/2 IF) | 88.9 | 88.11 | 166.67 | 89.30 | 92.08 |
| NC44 | 101.6 | 101.60 | 166.67 | 106.67 | 104.78 |
| NC46(4IF) | 101.6 | 106.76 | 166.67 | 109.93 | 104.78 |
| NC50(41/2 IF) | 101.6 | 117.76 | 166.67 | 120.65 | 104.78 |
| NC56 | 114.3 | 121.84 | 250.00 | 134.14 | 117.48 |
| NC61 | 127.0 | 132.95 | 250.00 | 149.25 | 130.18 |
| NC70 | 139.7 | 152.00 | 250.00 | 171.05 | 142.88 |
| 65/8 REG | 114.3 | 134.14 | 166.67 | 137.72 | 117.48 |
| 75/8 REG | 120.7 | 133.35 | 250.00 | 162.72 | 123.83 |
| 85/8 REG | 123.8 | 149.25 | 250.00 | 184.94 | 127.00 |
| Note:NC23,26,31 and 23/8IF wall by thin thread connecting parts and without stress mode dispersion groove | |||||
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