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  1. Unionlever (Group) Petroleum Equipment Co.,Ltd.

    Spiral Drill Collar




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

    Technical specifications and parameters

    O.D. Cutting depth Lead +- 25.4
    (mm) (in) A(mm) B(mm) (mm)
    86 3 3/8 3.5 +- 0.79 679
    98.4 3 7/8 4.0 +- 0.79   914
    101.6~111.1 4~4 1/8 4.8 +- 0.79   914
    114.3~130.2 4 1/2~5 1/8 5.6 +- 0.79   965
    133.4~146.1 5 1/4~5 3/4 6.4 +- 0.79   1067
    149.2~161.9 5 7/8~6 3/8 7.1 +- 1.59   1067
    165.1~177.8 6 1/2~7 7.9 +- 1.59   1168
    181.0~200.0 7 1/8~7 7/8 8.7 +- 1.59 5.6 +- 0.79 1626
    203.2~225.4 8~8 7/8 9.5 +- 1.59 6.4 +- 0.79 1727
    228.6~250.8 9~9 7/8 10.3 +- 2.37 7.1 +- 1.59 1829
    254.0~276.2 10~10 7/8 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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