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  • non magnetic drill collars
  • non magnetic drill collars specifications

Non Magnetic Drill Collars

The non magnetic drill collars are made from low carbon stainless steel and conform to the requirements of API Spec.7 and SY/T5144.

■ Precauciones

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.

Main Technical Parameters

◆Non Magnetic Drill Collars Specifications

Connection OD ID L(mm) Bending
strength
ratio DF mm
Bending
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 Bending 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


◆ Non Mag Drill Collars Mechanical properties

OD Yield strength σ0.2 (Mpa) Tensile strength σb (Mpa) Elongation σ4 (%)
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
MPS=1×105/4πA /m
1. Average:Ur<1.010
2. Magnetic field gradient:△B≤0.05 µ T