Rat Hole
The kelly or drill pipes are stored in the rat hole.
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.
The kelly may be lowered into the rathole until the upper kelly valve rests on the top of the piece of casing.
Potential Hazard
- Falling or stepping into an uncovered rathole.
Possible Solution
- Cover the hole until it is lined with casing or other material during rigging-up.
Knowledge Check Choose the best answer for the question.
1-5. What is the primary hazard associated with the rathole?
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