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spiral drill collars 279.4mm*76.2mm
spiral drill collars 279.4mm*76.2mm

1.standard: API7-1 2.OD:79.4mm-279.4mm 3. factory directly delivery

Spiral drill collar is the main products in Jiangsu HEXIN, such drill collar can provent drilling process in the differential pressure block, the spiral groove will allow the mud around the drill collar of freedom flow to differentialpressure sticking. With the drilling shaft to reduce the contact area. Which can effectively reduce the block have the possibility of differential pressure.

Spiral drill collar had been widely used because of the characteristics of its own decesion,this special spiral drill collar to reduce the tube wall and the contact area. The drill sting so as to avoid “sticking”phenomenon.

Type

OD(mm)

ID(mm)

L(m)        ±152.4mm d

DF(mm)    ±0.4

NC23-31

79.4

31.8

9.14

76.2

NC26-35

88.9

38.1

9.14

82.9

NC31-41

104.8

50.8

9.14or9.45

100.4

NC35-47

120.6

50.8

9.14or9.45

114.7

NC38-50

127

57.2

9.14or9.45

121

NC44-60

152.4

57.2

9.14or9.45

144.5

NC44-60

152.4

71.4

9.14or9.45

144.5

NC46-62

158.8

57.2

9.14or9.45

149.2

NC46-62

158.8

71.4

9.14or9.45

150

NC46-65

165.1

57.2

9.14or9.45

154.8

NC46-65

165.1

71.4

9.14or9.45

154.8

NC46-67

171.4

57.2

9.14or9.45

159.5

NC50-70

177.8

57.2

9.14or9.45

164.7

NC50-70

177.8

71.4

9.14or9.45

164.7

NC50-72

184.2

71.4

9.14or9.45

169.5

NC56-77

196.8

71.4

9.14or9.45

185.3

NC56-80

203.2

71.4

9.14or9.45

190.1

6-5/8REG

209.6

71.4

9.14or9.45

195.6

NC61-90

228.6

71.4

9.14or9.45

212.7

7-5/8REG

241.3

76.2

9.14or9.45

223.8

NC70-97

247.6

76.2

9.14or9.45

232.6

NC70-100

254

76.2

9.14or9.45

237.3

8-5/8REG

279.4

76.2

9.14or9.45

266.7

NC50-67

171.5

71.4

9.14or9.45

159.5

spiral drill collars 279.4mm*76.2mm

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