Drill Collar
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Drill collars are manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. Our company supplies slick drill collars, spiral drill collars and non-magnetic drill collars etc. The size of drill collar Kingwell is from 3-1/8 to 11 inches. Besides models listed in the table below, other drill collars at customers' specific request can be available.
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Drill Collar
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Drill Collar Model
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D
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d
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L(mm)
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DF(mm)
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Bending Strength ratio
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Drill Collar
Nominal size
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mm
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In
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mm
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in
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QW-DC3-1/8
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79.4
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3-1/8
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31.8
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1-1/2
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9,150
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76.2
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2.57:1
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NC23-31
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|
QW-DC 3-1/2
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88.9
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3-1/2
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38.1
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1-1/2
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9,150
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82.9
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2.42:1
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NC26-35(2-3/8IF)
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|
QW-DC 4-1/8
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104.8
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4-1/8
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50.8
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2
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9,150
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100.4
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2.43:1
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NC31-41(2-7/8IF)
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QW-DC 4-3/4
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120.7
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4-3/4
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50.8
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2
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9,150
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114.7
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2.58:1
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NC35-47
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QW-DC 5
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127
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5
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57.2
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2-1/4
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9,150
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121
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2.38:1
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NC38-50(3-1/2IF)
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QW-DC 6A
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152.4
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6
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57.2
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2-1/4
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9,150/9,450
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144.5
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2.49:1
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NC44-60
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QW-DC 6B
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152.4
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6
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71.4
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2-13/16
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9,150/9450
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144.5
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2.84:1
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NC44-60
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|
QW-DC 6-1/4A
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158.8
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6-1/4
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57.2
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2-1/4
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9,150/9,450
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149.2
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2.91:1
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NC44-62
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QW-DC 6-1/4B
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158.8
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6-1/4
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71.4
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2-13/16
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9,150/9,450
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150
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2.63:1
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NC46-62(4IF)
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QW-DC 6-1/2A
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165.1
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6-1/2
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57.2
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2-1/4
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9,150/9,450
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154.8
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2.76:1
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NC46-65(4IF)
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QW-DC 6-1/2B
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165.1
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6-1/2
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71.4
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2-13/16
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9,150/9,450
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154.8
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3.05:1
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NC46-65(4IF)
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QW-DC 6-3/4A
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171.4
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6-3/4
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57.2
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2-1/4
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9,150/9,450
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159.5
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3.18:1
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NC46-67(4IF)
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QW-DC 6-3/4B
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171.4
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6-3/4
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71.4
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2-13/16
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9,150/9,450
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159.5
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2.37:1
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NC50-67(4-1/2IF)
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QW-DC 7A
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177.8
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7
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57.2
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2-1/4
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9,150/9,450
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164.7
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2.54:1
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NC50-70(4-1/2IF)
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QW-DC 7B
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177.8
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7
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71.4
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2-13/16
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9,150/9,450
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164.7
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2.73:1
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NC50-70(4-1/2IF)
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QW-DC 7-1/4
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184.2
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7-1/4
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71.4
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2-13/16
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9,150/9,450
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169.5
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3.12:1
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NC50-72(4-1/2IF)
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QW-DC 7-3/4
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196.8
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7-3/4
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71.4
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2-13/16
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9,150/9,450
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185.3
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2.70:1
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NC56-77
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QW-DC 8
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203.2
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8
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71.4
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2-13/16
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9,150/9,450
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190.1
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3.02:1
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NC56-80
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QW-DC 8-1/4
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209.6
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8-1/4
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71.4
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2-13/16
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9,150/9,450
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195.7
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2.93:1
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6-5/8REG
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QW-DC 9
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228.6
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9
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71.4
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2-13/16
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9,150/9,450
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212.7
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3.17:1
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NC61-90
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QW-DC 9-1/2
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241.3
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9-1/2
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76.2
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3
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9,150/9,450
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223.8
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2.81:1
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7-5/8REG
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QW-DC 9-3/4
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247.6
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9-3/4
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76.2
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3
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9,150/9,450
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232.6
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2.57:1
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NC70-97
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QW-DC 10
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254
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10
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76.2
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3
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9,150/9,450
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237.3
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2.81:1
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NC70-100
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QW-DC 11
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279.4
|
11
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76.2
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3
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9,150/9,450
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266.7
|
2.84:1
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8-5/8 REG
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