What is a top drive - engage the pumps or the rotary while...

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What is a top drive? A top drive is a device that turns the drillstring. It consists of one or more motors (electric or hydraulic) connected with appropriate gearing to a short section of pipe that in turn may be screwed into a saver sub or the drillstring itself. Top drive assemblies can be used on either land or ocean based drilling rigs. The topdrive is suspended from the hook, so the rotary mechanism is free to travel up and down the derrick. This is radically different from the more conventional rotary table and kelly method of turning the drillstring because it enables drilling to be done with three joint stands instead of single joints of pipe. It also enables the driller to quickly
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Unformatted text preview: engage the pumps or the rotary while tripping pipe, which cannot be done easily with the kelly system. Modern topdrives are a major improvement to drilling rig technology and are a large contributor to the ability to drill more difficult extended-reach wellbores. In addition, the topdrive enables drillers to minimize both frequency and cost per incident of stuck pipe. Stuck pipe is a consequence of pore mud qualities. Dr illing fluids, typically called mud, are pumped into the hole during drilling. The mud is used to cool the drill bit and hole bottom as well as remove cuttings....
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What is a top drive - engage the pumps or the rotary while...

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