The first new-build semi-submersible drilling rig incorporating Wood Group Mustang Norway’s (WGMN) GG5000 floating hull design has been delivered to COSL Drilling Europe (CDE). The COSLProspector was designed to operate in water depths up to 1,500m and drill wells up to 7,600m. The unit is planned for use on the Norwegian Continental Shelf (NCS).
WGMN was responsible for the basic design and participated in the detailed design of the semi-submersible hull and main marine systems. The 50,000 person-hour project was engineered to Norwegian Petroleum Directorate (NPD) standards.
“The delivery of the rig as designed is the result of a highly successful collaboration among WGMN, CDE and Yantai CIMC Raffles Shipyard”, explained Otto Søberg, president of WGMN. “We worked closely with CDE to ensure the design of the rig would meet its needs and objectives and with the shipyard to deliver the rig as planned, thereby avoiding costly construction modifications common to the industry.”
Prior to designing the COSLProspector, WGMN performed the modification design and engineering for three CDE drilling rigs: COSLPioneer, COSLInnovator and COSLPromoter. WGMN is currently providing engineering services for another semi-submersible to CDE’s parent company, China Oilfield Services Limited (COSL).