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Non magnetic drill collar
The non magnetic drill collars are made from low carbon stainless steel and conform to the requirements of API Spec.7 and
SY/T5144.All threads are phosphated,copperized or cold worked. All connections are equipped with pressed steel thread protectors. All threads are machined with CNC Lathes-Double-shouldered and special threads.
◆Non magnetic Drill Collars Specification
SY/T5144.All threads are phosphated,copperized or cold worked. All connections are equipped with pressed steel thread protectors. All threads are machined with CNC Lathes-Double-shouldered and special threads.
◆Non magnetic Drill Collars Specification
| Connection | OD | ID | L(mm) | DF mm Bending strength ratio | Bend Strength ratio | ||
| mm | in | mm | in | ||||
| 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 | 9150 or 9450 | 100.4 | 2.43:1 |
| NC35-47 | 120.7 | 4 3/4 | 50.8 | 2 | 9150 or 9450 | 114.7 | 2.58:1 |
| NC38-50 | 127.0 | 5 | 57.2 | 2 1/4 | 9150 or 9450 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150 or 9450 | 144.5 | 2.49:1 |
| NC44-60 | 152.4 | 6 | 71.4 | 2 13/16 | 9150 or 9450 | 144.5 | 2.84:1 |
| NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150 or 9450 | 149.2 | 2.91:1 |
| NC46-62 | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150 or 9450 | 150.0 | 2.63:1 |
| NC 46-65 | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150 or 9450 | 154.8 | 2.76:1 |
| NC 46-65 | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150 or 9450 | 154.8 | 3.05:1 |
| NC 46-47 | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150 or 9450 | 159.5 | 3.18:1 |
| NC 50-67 | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150 or 9450 | 159.5 | 2.37:1 |
| NC 50-70 | 177.8 | 7 | 57.2 | 2 1/4 | 9150 or 9450 | 164.7 | 2.54:1 |
| NC 50-70 | 177.8 | 7 | 71.4 | 2 13/16 | 9150 or 9450 | 164.7 | 2.73:1 |
| NC 50-72 | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150 or 9450 | 169.5 | 3.12:1 |
| NC 56-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150 or 9450 | 185.3 | 2.70:1 |
| NC 56-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150 or 9450 | 190.1 | 3.02:1 |
| 6 5/8 REG | 209.6 | 8 1/4 | 71.4 | 2 13/16 | 9150 or 9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 2 13/16 | 9150 or 9450 | 212.7 | 3.17:1 |
| 7 5/8 REG | 241.3 | 9 1/2 | 76.2 | 3 | 9150 or 9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 9 3/4 | 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 |
| 8 5/8 REG | 279.4 | 11 | 76.2 | 3 | 9150 or 9450 | 266.7 | 2.84:1 |
◆Dimensional Tolerances for Non magnetic Drill Collar
| OD | OD | ID | Lmm | Bend Strength ratio DF | |
| mm | in | ||||
| ≤88.9 | ≤3 1/2 |
+1.2 0 |
+1.6 0 |
+152.4 |
±0.4 |
| ＞88.9-114.3 | ＞3 1/2-4 1/2 |
+1.6 0 |
|||
| ＞114.3-139.7 | ＞4 1/2-5 1/2 |
+2.0 0 |
|||
| ＞139.7-165.1 | ＞5 1/2-6 1/2 |
+3.2 0 |
|||
| ＞165.1-215.9 | ＞6 1/2-8 1/2 |
+4.0 0 |
|||
| ＞215.9-241.3 | ＞8 1/2-9 1/2 |
+4.8 0 |
|||
| ＞241.3 | ＞9 1/2 |
+6.4 0 |
|||
◆Mechanical Properties
| OD |
Yield Strength (Mpa) |
Tensile strength (Mpa) |
Elongation (%) |
|
| mm | in | |||
| 88.9-174.6 | 3 1/8-6 3/4 | ≥758 | ≥827 | ≥18 |
| 177.8-279.4 | 7-11 | ≥689 | ≥758 | ≥20 |
Magnetic Properties
Magnetic field=1×105/4 πA /m
Average:Ur＜1.010
Magnetic field gradient:△B≤0.05 Tf
Magnetic field=1×105/4 πA /m
Average:Ur＜1.010
Magnetic field gradient:△B≤0.05 Tf