Most drill ships and barges have a walled opening below the derrick,open to the water’s surface and through which various drilling tools can pass down to the sea floor called a ().
A、moon pool
B、spider deck opening
C、pontoon
D、keyway
A、moon pool
B、spider deck opening
C、pontoon
D、keyway
A、transport tubulars from the pipe racks to the derrick floor B、maintain constant tension on the marine riser C、store and secure the excess drill line D、lower and hoist the drill string into and out of the drilled hole
A、close and seal around the drill pipe B、close and seal around casing C、cut off pipe inside the preventer stack D、close and seal around drill collars
A、Controlling access to the ship B、Training and drills C、Controlling the restrictedareas D、Monitoring the ship at times
A、conduct a fire drill B、conduct a boat drill C、log the fore and aft draft marks D、test the emergency generator