.

Spiral drill collar

Spiral Drill Collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. spiral drill collars are manufactured strictly according to API Spec7-1 and Standard SY5144.

O.D.

Cuttingdepth

Lead+-25.4

(mm)

(in)

A(mm)

B(mm)

(mm)

86

33/8

3.5+-0.79

679

98.4

37/8

4.0+-0.79

914

101.6~111.1

4~41/8

4.8+-0.79

914

114.3~130.2

41/2~51/8

5.6+-0.79

965

133.4~146.1

51/4~53/4

6.4+-0.79

1067

149.2~161.9

57/8~63/8

7.1+-1.59

1067

165.1~177.8

61/2~7

7.9+-1.59

1168

181.0~200.0

71/8~77/8

8.7+-1.59

5.6+-0.79

1626

203.2~225.4

8~87/8

9.5+-1.59

6.4+-0.79

1727

228.6~250.8

9~97/8

10.3+-2.37

7.1+-1.59

1829

254.0~276.2

10~107/8

11.1+-2.37

7.9+-1.59

1930

279.4

11

11.9+-2.37

8.7+-1.59

2032


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