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The Main Technical Specification of Spiral Drill Collar
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O.D.
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I.D.
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Connections
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inch
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mm
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inch
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mm
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4-1/8
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104.78
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2
2-1/4
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50.80
57.15
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NC31,NC35
NC35
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4-3/4
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120.65
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2
2-1/4
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50.80
57.15
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NC35,
NC35,NC38(3 1/2IF)
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6-1/4
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158.75
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2-1/4
2-1 3/16
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57.15
71.44
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NC46(4 IF)
NC46(4 IF)
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6-1/2
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165.1
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2-1/4
2-1 3/16
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57.15
71.44
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NC46(4 IF)
NC46(4 IF)
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|
7
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177.8
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2-1/4
2-1 3/16
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57.15
71.44
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NC50(4 1/2IF)
NC50(4 1/2IF)
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|
8
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203.2
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2-1 3/16
3
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71.44
76.20
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6 5/8REG
6 5/8REG
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9
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228.6
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2-1 3/16
3
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71.44
76.20
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7 5/8REG
7 5/8REG
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9-1/2
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241.3
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3
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76.20
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7 5/8REG
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|
10
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254
|
3
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76.20
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NC70
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|
11
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275.4
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3
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76.20
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NC77
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