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    3. what type of tool is used to latch onto drillstringwhile hoisting or lowering drill pipe?
    what type of tool is used to latch onto drillstringwhile hoisting or lowering drill pipe?

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    +1  Views: 813 Answers: 1 Posted: 14 years ago
    Tags: oil feild
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      It is a rod called the Kelly or Grief Stem.


       

      14 years ago. Rating: 1
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