A Rathole is a temporary storage space that is 30 to 35 feet deep, lined with casing that projects above the floor, and used to store the kelly and swivel. This is either done by the portable rig that drills the conductor hole or can be done by the primary rig after rigging-up.
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[pdf] The top drive is one of the components of the drilling rig that is used to rotate the drill string during drilling, having 1000 horsepower, which rotates the shaft to which the drill string is attached. It decreases t.
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