Non Magnetic Drill Collars

Non Magnetic Drill Collars

Model No: 40w
Solar Power: 60W
Height: 5 – 7 Meters
Lifespan: 50,000hrs

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 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

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