Ang mga non-magnetic drill collars ay gawa sa hindi kinakalawang na asero at nakakatugon sa mga hinihiling ng APL spec.7and Sy/T5144.Ang mga thread ay na-phosphate, tanso o malamig na nagtrabaho. Al lconnections ay nilagyan ng mga pinindot na bakal na threadprotectors.All thread ay makina withcnc lathes-double-shouldered at mga espesyal na thread.
Ang mga pagtutukoy ng di-magnetic drill collar | |||||||
Numero ng drill ng kwelyo | Od | ID | Haba mm | Ang diameter ng chamfer ng balikat df mm | Baluktot na ng lakas rasyon | ||
mm | sa | mm | sa | ||||
NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/4 | 9150 | 76.2 | 2.57: 1 |
NC26-35 | 88.9 | 3 1/2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42: 1 |
NC31-41 | 104.8 | 4 1/8 | 50.8 | 2 | 9150OR9450 | 100.4 | 2.43: 1 |
NC35-47 | 120.7 | 4 3/4 | 50.8 | 2 | 9150OR9450 | 114.7 | 2.58: 1 |
NC38-50 | 127 | 5 | 57.2 | 2 1/4 | 9150OR9450 | 121 | 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 | 6 1/4 | 57.2 | 2 1/4 | 9150OR9450 | 149.2 | 2.91: 1 |
NC46-62 | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150OR9450 | 150 | 2.63: 1 |
NC46-65 | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150OR9450 | 154.8 | 2.76: 1 |
NC46-65 | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150OR9450 | 154.8 | 3.05: 1 |
NC46-67 | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150OR9450 | 159.5 | 3.18: 1 |
NC50-67 | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150OR9450 | 159.5 | 2.37: 1 |
NC50-70 | 177.8 | 7 | 57.2 | 2 1/4 | 9150OR9450 | 164.7 | 2.54: 1 |
NC50-70 | 177.8 | 7 | 71.4 | 2 13/16 | 9150OR9450 | 164.7 | 2.73: 1 |
NC50-72 | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150OR9450 | 169.5 | 3.12: 1 |
NC56-77 | 196.8 | 7 3/4 | 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 |
65/8reg | 208.6 | 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 |
75/8reg | 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 | 10 | 76.2 | 3 | 9150OR9450 | 237.3 | 2.81: 1 |
85/8reg | 279.4 | 11 | 76.2 | 3 | 9150OR9450 | 266.7 | 2.84: 1 |
Mga mekanikal na katangian ng mga non-magnetic drill collars | |||||||||
Od | Lakas ng ani | Lakas ng makunat | Pagpahaba | Pag -urong | Tigas | Epekto AKV | |||
mm | sa | Ksi | MPA | Ksi | MPA | Pares | Pares | HB | J |
≤180 | ≤7 | ≥120 | ≥828 | ≥135 | ≥931 | ≥25 | ≥50 | 285-360 | ≥75 |
> 180 | > 7 | ≥110 | ≥759 | ≥130 | ≥897 | ≥25 | ≥50 | 285-360 | ≥75 |
Magnetic properties (magnetic field = 1x10³/4πa/m)
1.Average: μr <1.010.
2.Magnetic field gradient: △ b≤0.05μt.