Drilling Industry Glossary
daily drilling report density hierarchy derrick derrickhand diamond bit differential pressure differential survey directional drilling directional drilling software displacement fluid doghouse dogleg dogleg severity donkey pump doughnut downhole motor downtime draw works drill collars drill collar sub drill pipe drill stem drill stem test drill string drillers drilling engineering design drilling fluid drilling foreman dry hole dual completion dutchman
Drill Collar Sub
A sub made up between the drill string and the drill collars used to ensure that the drill pipe and the collar can be joined properly.
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