Rathole 1
Rathole 1 :
A hole in the rig floor, some 30 to 40 feet deep, which is lined with casing that projects above the floor, into which the kelly and the swivel are placed when hoisting operations are in progress
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A hole in the rig floor, some 30 to 40 feet deep, which is lined with casing that projects above the floor, into which the kelly and the swivel are placed when hoisting operations are in progress