COSLProspector, the fourth deep-water semi-submersible drilling rig built by CIMC Raffles for China Oilfield Services Limited (COSL), has been delivered in Yantai, Shandong Province.

The COSLProspector is a DP3 vessel with a length of 104.5 m, a width of 70.5 m, a height of 37.55 m, and an operating water depth of 1500 m. It is able to drill 7600 m deep and has a designed operating temperature of minus 20 degrees Celsius. The rig is a multi-function platform, which has a maximum variable deck load of 5000 t and is able to accommodate 130 personnel.

It is classed by DNV GL and China Classification Society (CCS) and meets the strictest standards of PSA and NORSOK. This highly automated unit is equipped with 10,000 controllers and alerts and can therefore be monitored remotely.

Design Features

The rig adopts advanced power management and environmentally-friendly design concept, and facilities, including a DP3 closed bus-tie, a variable frequency drive, an escape chute system and auto ice-cleaning technology. Compared with its three sister rigs delivered since 2010 (COSLPioneer, COSLPromoter and COSLInnovator), COSLProspector adds ICE-T, Clean and Winterisation notations.

COSLProspector is the seventh deep-water semi-submersible drilling rig built by CIMC Raffles. The yard has other four semisubmersible drilling units under construction.