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Non-Magnetic Drill Collar (NMDC)

Orchid Energy can provide three types of Non Magnetic Drill Collar: Non Magnetic Slick Drill Collar, Non Magnetic Spiral Drill Collar, Non Magnetic Flex Drill Collar, Pony Collar.(P530,P550 material etc)

>>Introduction

Orchid Energy Non Magnetic Drill Collar (NMDC) are made from low-carbon stainless steel as API specification and implementation of SY/T5144 standard, which can be cold thread rolling, machine special double shoulder thread and do as other specifications request. Non Magnetic Drill Collar are as a housing for MWD tools and also could provide weight for drill string.

拼图

>>Parameter Table

Connection OD ID

Length

(mm)

Bevel

Diameter

(mm)

Weight

(lb/ft)

Bending

Strength Ratio

(in) (mm) (in) (mm)
NC23-31 3-1/8 79.4 1-1/4 31.8 9150 76.2 22 2.57:1
NC26-35 3-1/2 88.9 1-1/2 38.1 9150 82.9 27 2.42:1
NC31-41 4-1/8 104.8 2 50.8 9150 100.4 35 2.43:1
NC35-47 4-3/4 120.7 2 50.8 9150 114.7 47 2.58:1
NC38-50 5 127 2-1/4 57.2 9150 121.0 53 2.38:1
NC44-60 6 152.4 2-1/4 57.2 9150 or 9450 144.5 83 2.49:1
NC44-60 6 152.4 2-13/16 71.4 9150 or 9450 144.5 75 2.84:1
NC44-62 6-1/4 158.8 2-1/4 57.2 9150 or 9450 149.2 91 2.91:1
NC46-62 6-1/4 158.8 2-13/16 71.4 9150 or 9450 150.0 83 2.63:1
NC46-65 6-1/2 165.1 2-1/4 57.2 9150 or 9450 154.8 99 2.76:1
NC46-65 6-1/2 165.1 2-13/16 71.4 9150 or 9450 154.8 91 3.05:1
NC46-67 6-3/4 171.4 2-1/4 57.2 9150 or 9450 159.5 108 3.18:1
NC50-67 6-3/4 171.4 2-13/16 71.4 9150 or 9450 159.5 108 2.37:1
NC50-70 7 177.8 2-1/4 57.2 9150 or 9450 164.7 117 2.54:1
NC50-70 7 177.8 2-13/16 71.4 9150 or 9450 164.7 110 2.73:1
NC50-72 7-1/4 184.2 2-13/16 71.4 9150 or 9450 169.5 119 3.12:1
NC56-77 7-3/4 196.8 2-13/16 71.4 9150 or 9450 185.3 139 2.70:1
NC56-80 8 203.2 2-13/16 71.4 9150 or 9450 190.1 150 3.02:1
6 5/8REG 8-1/4 209.6 2-13/16 71.4 9150 or 9450 195.7 160 2.93:1
NC61-90 9 228.6 2-13/16 71.4 9150 or 9450 212.7 195 3.17:1
7 5/8REG 9-1/2 241.3 3 76.2 9150 or 9450 223.8 216 2.81:1
NC70-97 9-3/4 247.6 3 76.2 9150 or 9450 232.6 229 2.57:1
NC70-100 10 254 3 76.2 9150 or 9450 237.3 243 2.81:1
8 5/8REG 11 279.4 3 76.2 9150 or 9450 266.7 299 2.84:1
Tolerance Size of Non-Magnetic Drill Collar (NMDC)
OD Range OD ID Length

Shoulder chamfer diameter-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 Property of Non-Magnetic Drill Collar (NMDC)
Steel OD Range

Yield Strength Rt

Tensile Strength Rm

Elongation

Impact Value

Hardness Brinell

Grade in Mpa ksi Mpa ksi A(%) Akv/L (HB)
NM530 3 1/8 - 6 7/8 ≥827 ≥120 ≥827 ≥120 ≥25 ≥150 285-360
7 - 9 1/2 ≥758 ≥110
NM550 3 1/8-6 7/8 ≥965 ≥140 ≥1034 ≥150 ≥25 ≥150 285-360
7- 9 1/2 ≥827 ≥120
NM650 3 1/8-6 7/8 ≥965 ≥140 ≥1034 ≥150 ≥20 ≥90 330-400
7- 9 1/2 ≥896 ≥130

Test and Inspection carried out on each bar: Chemical Composition, Tensile Test, Impact Test, Hardness Test, Metallographic Test, Corrosion Test, Ultrasonic Test over the whole length of the bar, Relative magnetic permeability Test, Hot spot Test, Dimensional Inspection.

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