• Drill Collars

    •      Drill Collar Specifications

    Slick drill collars:

    ThyssenKrupp slick drill collars are available for all typical sizes and bores

    Surface finish of slick drill collars is achieved by a carefully controlled peeling operation.

    All features such as stress relief grooves on connections and slip and elevator recesses are available on most sizes.

         		Hardbanding:

    ThyssenKrupp offers several hardbanding options from fine particle hardbanding to our own smooth hardbanding design or special hardbanding options supplied by third parties.

    The ThyssenKrupp recommended hardbanding design is as follows:

  • DRILL COLLARS without slip and elevator grooves: 10" long wear band at 30" minimum from the pin end.
  • DRILL COLLARS with slip and elevator grooves: 4" long wear band above elevator groove, 1" band between grooves, 10" long wear band under slip groove.
  • Standard application is raised (proud). flush on request.
  • Other configurations are available on request.

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    Spiralling:

    spiralling of drill collars reduces the danger of differential pressure sticking particularly in deviated or horizontal holes. Spiral grooving of ThyssenKrupp collars provides sufficient depth in order to be effective.

    Spiralling of drill collars is available from sizes 4 3/4 in. to 11 1/4" outside diameter.