DRILLSHIP HAVING UNIT-TYPE DERRICK STRUCTURE AND DRILLING METHOD USING UNIT-TYPE DERRICK STRUCTURE

摘要

The present invention relates to a drillship having a unit-type derrick structure. The drillship of the present invention has a turn table-type derrick structure and enables drilling operations to be carried out outside both sides of the ship since the derrick structure is rotated at 90 degrees during the real drilling operation. Since a separate moonpool structure and a hole in a bottom shell plate are not required, efficiency in the aspect of hull resistance can be improved, and simplification of a mooring system and saving of the capacity of the main engine can be expected. There has been some decreases in productivity caused by interference when a hull and the derrick structure are built in conventional ways. However, according to the present invention, since most of drilling equipment are made into units and installed in the derrick structure, the interface problem can be solved. Especially, interface points can be significantly reduced since the turn table-type derrick structure includes piping-related equipment such as a mud system.;COPYRIGHT KIPO 2015