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Drill collar




The drill collar are made from 4145H modified chromium-molybdenum alloy steel acc.to APISpec.7 and SY/T5144.All threads can be phosphated,copperised or cold worked.All threads are machined CNC Lathes-Double-shouldered and special threads,and the max dimeter of drill collar is 14inch.
◆Standard sizes, bores and connections of drill collar
 
Connection OD ID L(mm) DFmm
Bending strength ratio
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
 
◆   Mechanical properties
OD Yield strengthσ0.2
(Mpa)
Tensile strength
σb
(Mpa)
Elongation
σ4
(%)
Brinell hardness
HB
Impact value
(V-notch charpy)
AK
J
mm in
88.9-174.6 3 1/8-6 3/4 ≥758 ≥965 ≥13 ≥285 ≥54
177.8-279.4 7-11 ≥689 ≥930
◆   Dimension tolerances
OD OD ID L mm Bevel 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
                                 

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Drill collar
Published in:2012-10-18 14:58
       (1)Standard:API Spec.7 and SY/T5144
       (2) Material:4145H modified chromium-molybdenum alloy steel.
       (3)Size:3 1/8”-11”
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