COSL operates and manages the largest, the most powerful, and the most diverse working and support oil-industry fleet in offshore China. COSL owns and operates more than 130 vessels, including anchor-handling tug/supply vessels (AHTS), platform supply vessels (PSV), multi-purpose vessels, barges, and shuttle-tankers. As a professional provider of offshore support vessels, COSL provides a comprehensive range of vessel services that can satisfy even the most detailed requirements: anchor-handling; towing; oil lifting; transportation; stand-by vessel (guard-ship); ice-breaking; firefighting, rescue; oil-spill assistance; and workover support.

In 2012, the first deepwater anchor-handling tug/supply vessel (AHTS) “HYSY 681” was launched. Rolls-Royce diesel-electric main propulsion engines produce 23500KW, a bollard-pull of 339TBP, DP II, and a maximum speed of eighteen (18) knots. It is a latest-generation vessel integrating various deepwater functions such as anchor-handling, towing, supply, stand-by, firefighting, oil recovery and ROV operation assistance.

In 2013 and 2014, a series of 6000HP DP-II Platform Supply Vessels (PSV) was put into operation. “HYSY 611”, “HYSY 612”, “HYSY 613” and “HYSY 614” are capable to offer stand-by (guard-ship), supply (oil, water, dry-bulk, liquid-mud, brine, glycol and methanol), firefighting, and powerful deck -cargo loading services in deepwater.

In 2015, 6 new built deepwater PSV and 9 AHTS vessels were delivered and joined our MSV fleet. Besides that, another 15 PSV, AHTS and ice-breaking vessels are under construction and will be delivered in 2016-2017.