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Dongying Eternal Petroleum Technology Co.,Ltd
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 Click to enlarge image
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Standard size ,bores and connection for drill collars
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OD
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ID
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length
mm
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Bevel diameter
mm
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connection style
and size
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Bending strength
ratio
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in
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mm
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in
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mm
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31/8
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79.4
|
11/4
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31.8
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9150
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76.2
??/span>
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NC23
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2.57:1
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31/2
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88.9
|
11/2
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38.1
|
9150
|
82.9
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NC26(23/8IF)
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2.42:1
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41/8
|
104.8
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2
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50.8
|
9150
|
100.4
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NC31(27/8IF)
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2.43:1
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43/4
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120.7
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2
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50.8
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9150
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114.7
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NC35
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2.58:1
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5
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127
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21/4
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57.2
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9150
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121.0
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NC38(31/2IF)
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2.38:1
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6
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152.4
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21/4
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57.2
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9150or9450
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144.5
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NC44
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2.49:1
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6
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152.4
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213/16
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71.4
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9150or9450
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144.5
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NC44
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2.84:1
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61/4
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158.8
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21/4
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57.2
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9150 or 9450
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149.2
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NC44
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2.91:1
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61/4
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158.8
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213/16
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71.4
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9150 or 9450
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150.0
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NC46(4IF)
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2.63:1
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61/2
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165.1
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21/4
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57.2
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9150 or 9450
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154.8
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NC46(4IF)
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2.76:1
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61/2
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165.1
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213/16
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71.4
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9150 or 9450
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154.8
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NC46(4IF)
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3.05:1
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63/4
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171.4
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21/4
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57.2
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9150 or 9450
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159.5
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NC46(4IF)
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3.18:1
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63/4
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171.4
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213/16
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71.4
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9150 or 9450
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159.5
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NC50(41/2IF)
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2.37:1
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7
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177.8
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21/4
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57.2
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9150 or 9450
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164.7
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NC50(41/2IF)
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2.54:1
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7
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177.8
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213/16
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71.4
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9150 or 9450
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164.7
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NC50(41/2IF)
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2.73:1
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71/4
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184.2
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213/16
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71.4
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9150 or 9450
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169.5
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NC50(41/2IF)
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3.12:1
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73/4
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196.8
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213/16
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71.4
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9150 or 9450
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185.3
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NC56
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2.70:1
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8
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203.2
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213/16
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71.4
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9150 or 9450
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190.1
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NC56
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3.02:1
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81/4
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209.6
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213/16
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71.4
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9150 or 9450
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195.7
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65/8REG
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2.93:1
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9
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228.6
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213/16
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71.4
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9150 or 9450
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212.7
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NC61
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3.17:1
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91/2
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241.3
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3
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76.2
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9150 or 9450
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223.8
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75/8REG
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2.81:1
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93/4
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247.6
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3
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76.2
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9150 or 9450
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232.6
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NC70
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2.57:1
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10
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254.0
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3
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76.2
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9150 or 9450
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237.3
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NC70
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2.81:1
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11
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279.4
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3
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76.2
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9150 or 9450
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266.7
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85/8REG
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2.84:1
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