It was announced from Shanghai on 21 November that COSLProspector, the fourth deep-water semi-submersible drilling rig built by CIMC Raffles for China Oilfield Services Limited (COSL), had been delivered in Yantai, Shandong Province. It represents another milestone for China’s deep-water drilling rig going into the global mainstream market.

COSLProspector fulfils ice-class, environment-friendly and low-temperature
requirements