Deepwater Drilling Rig COSLProspector Commences Drilling Operation in South China Sea

China Oilfield Services Limited ("COSL" or the "Company") said its deepwater drilling rig COSLProspector recently has commenced drilling operation for its first oil well in the deep water regions in South China Sea. In order to ensure smooth completion of this inaugural drilling operation, the Company made thorough pre-drilling preparations. This operation is carried out for an oil well sitting at a water depth of 1,289 meters, and a designed drilling depth of the rig at 3,626 meters.

COSLProspector is a deepwater semi-submersible drilling rig equipped with Dynamic Position System with a maximum operation water depth of 1,500 meters and a maximum drilling depth of 7,500 meters. This rig has met requirements by both Det Norske Veritas (DNV) and NORSOK standards for offshore drilling platforms. This rig has met requirements to operate under freezing temperature, environmental-friendly and low temperature conditions, capable of performing operations in waters under extreme conditions. It can adapt to 90% of the water conditions in the world.

Smooth operation of COSLProspector provides leading technology and equipment support to COSL's participation in competition in the international deepwater drilling market.


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